CLK55 vs Jeep SRT8
Super Member
Joined: Sep 2006
Posts: 537
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From: San Jose, CA
Charger SRT-8
I worked on the Jeep SRT8 prior to its release and from a launch it can sometimes pull over 1g which is crazy for a heavy SUV. The 0-60 time of 4.5s that someone posted is far fetched for a stock SRT8. I've never seen anything close to that. More like high 4's, low 5's in the real world. The lower times you will get only when it's cold and dry. In the snow, it has an impressive 0-60 of about 7.5s which is faster than a lot of cars on asphalt! Compared to a 300 SRT8, there is no comparison, the Jeep just crushes the 300 so bad out of the whole it's not even funny. At highway speeds they are quick, but nothing special.
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
i don't care what everyone else is doing or needs, including the z06's...and i won't pretend to be able to speak for them. i'm just stating what i'm doing over and over and over.
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Joined: Jun 2002
Posts: 7,894
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From: Connecticut
2003 CLK55
I worked on the Jeep SRT8 prior to its release and from a launch it can sometimes pull over 1g which is crazy for a heavy SUV. The 0-60 time of 4.5s that someone posted is far fetched for a stock SRT8. I've never seen anything close to that. More like high 4's, low 5's in the real world. The lower times you will get only when it's cold and dry. In the snow, it has an impressive 0-60 of about 7.5s which is faster than a lot of cars on asphalt! Compared to a 300 SRT8, there is no comparison, the Jeep just crushes the 300 so bad out of the whole it's not even funny. At highway speeds they are quick, but nothing special.
MBWorld Fanatic!
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Posts: 8,882
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From: In my garage
E55, GLS450, GL63, GLE350
Fixed in five minutes is a bit misleading...And it usually takes multiple trips to the dealership for them to figure out. They usually want to replace the whole tranny. 
But other than that, they are very good trannies, I agree. They are NOT the exact one that MB uses...the MB trannies shift like butter compared to the Chryslers...for whatever reason I am not sure.
But other than that, they are very good trannies, I agree. They are NOT the exact one that MB uses...the MB trannies shift like butter compared to the Chryslers...for whatever reason I am not sure.
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Joined: Dec 2006
Posts: 1,359
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From: OC, CA
215
I have an ML63 and have raced numerous SRT8 Jeeps. The Jeep does launch better, but I ALWAYS catch up around the 1/8th mile mark, and after that, there is no comparison. The ML wins every time.
In regards to CLK55s, The first week I got the ML, I raced my cousins CLK55 W209, and he was annihialated. Since the Jeep is so close in performance with the ML63, chances are, you have no chance to keep up with the Jeep in a CLK55.
Here is a video of me Murdering the CLK and keep on pulling the whole time.
http://www.youtube.com/watch?v=jYVOMdFNF_c
This is just another perspective for the you guys.
Here is a video of what happens when a Jeep tries to race my Benz too
http://www.youtube.com/watch?v=K3fcfbrgyds
In regards to CLK55s, The first week I got the ML, I raced my cousins CLK55 W209, and he was annihialated. Since the Jeep is so close in performance with the ML63, chances are, you have no chance to keep up with the Jeep in a CLK55.
Here is a video of me Murdering the CLK and keep on pulling the whole time.
http://www.youtube.com/watch?v=jYVOMdFNF_c
This is just another perspective for the you guys.
Here is a video of what happens when a Jeep tries to race my Benz too
http://www.youtube.com/watch?v=K3fcfbrgyds
Last edited by Blue_Monster; Aug 21, 2008 at 01:27 PM.
Super Member
Joined: Sep 2006
Posts: 537
Likes: 0
From: San Jose, CA
Charger SRT-8
no actually, it's not open to interpretation. 1.71 on street tires (toyo t1r's) is what i said and i'ts an absolute fact...many times over and i have the timeslips to prove it.
i don't care what everyone else is doing or needs, including the z06's...and i won't pretend to be able to speak for them. i'm just stating what i'm doing over and over and over.
i don't care what everyone else is doing or needs, including the z06's...and i won't pretend to be able to speak for them. i'm just stating what i'm doing over and over and over.
To hit 1.7s, every other E55 needs DRs or better to do it. Expertly raced Z-06s need DRs to do it, SRT-8s with N02 or S/C need DRs to do it, I suspect the same with the SVT Performance website if the timeslip database was fully funcitonal.
Here's another thought - have you ever repeated it?
Bottom line, a 1.71, let alone 1.7s in a 3800lb, rear-drive street car on non-drag race tires essentially impossible. It defies physics and apparently, no one else can do it. And IF you did, why in the world you would post MT ET Streets when the accomplishment on street tires would be far, far more impressive?
Last edited by Deuuuce; Aug 23, 2008 at 12:36 AM.
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Joined: Jun 2006
Posts: 6,649
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
It just so happens your dragtimes posting lists MT ETs with the same 60ft time. Very interesting.
To hit 1.7s, every other E55 needs DRs or better to do it. Expertly raced Z-06s need DRs to do it, SRT-8s with N02 or S/C need DRs to do it, I suspect the same with the SVT Performance website if the timeslip database was fully funcitonal.
Here's another thought - have you ever repeated it?
Bottom line, a 1.71, let alone 1.7s in a 3800lb, rear-drive street car on non-drag race tires essentially impossible. It defies physics and apparently, no one else can do it. And IF you did, why in the world you would post MT ET Streets when the accomplishment on street tires would be far, far more impressive?
To hit 1.7s, every other E55 needs DRs or better to do it. Expertly raced Z-06s need DRs to do it, SRT-8s with N02 or S/C need DRs to do it, I suspect the same with the SVT Performance website if the timeslip database was fully funcitonal.
Here's another thought - have you ever repeated it?
Bottom line, a 1.71, let alone 1.7s in a 3800lb, rear-drive street car on non-drag race tires essentially impossible. It defies physics and apparently, no one else can do it. And IF you did, why in the world you would post MT ET Streets when the accomplishment on street tires would be far, far more impressive?
i ran street tires for a while. i finally got a set of custom 16" ccw light weight wheels and m/t's because i thought they would significantly help my times. they didn't. my best 60ft on d/r's is 1.69 but i almost ALWAYS run a 1.71. i believe the problem is that our tq limiting software will not allow any more tq to be applied when in 1st and 2nd gear which has caused me to hit a wall and not be able to improve on my launches. i use the m/t's most of the time at the track to save my street tires from wear and justify my purchase.
btw, i wish my race weight was 3800lbs!!! unfortunately, it's about 4300lbs. obviously, a 1.71 is not impossible since i've done it as often as i have. i'm not the only one either as there are a few others. actually, i believe enzom may even have a few 1.6x on his street tires launches. ironically he and i have discovered we both use identical launch techniques, something i have tried to get others to use, including the srt8 guys. for some reason, not many people listen and still try to use outdated techniques they learned while driving 30yr old muscle cars. as far as what's more impressive, my post on dragtimes was meant to be honest not impressive, and on that particular run i was using the d/r's.
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Out Of Control!!
Joined: Feb 2003
Posts: 13,489
Likes: 96
haters crazy
Some of the stuff in this thread made me crack up. A properly driven RWD car CAN out launch a stock Jeep SRT8. I dont know where you learned about physics but apparently they didnt teach you properly.
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Joined: Jun 2006
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
i've got a stack of 1.71 60ft timeslips but for some reason this guy is stuck on the one i have posted on dragtimes as if that was the only time i've ever raced. as many know, 1.71 is just what my car relentlessly does...unless i screw up.
there are plenty of members that can attest to seeing my car run 1.71 over and over again...on d/r's and street tires.
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Joined: Aug 2008
Posts: 41
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From: Charlotte, NC
1997 SL500
I've got a SRT8 Jeep with a Dana 44 front (TRUE posi) and a 9" Ford rear diff (TRUE posi) and it launches pretty hard.
With stock diffs the Jeep does a "2 wheel peel", the left front and the right rear tires spin, not so good when you add some additional power.
Mine is a built 426 so I had to design a front & rear diff to get a true positraction front and rear.
Bottom line, from a dig it is pretty quick, you guys pass most of us by the 1/8 and we won't catch most of you again until we pass 155 mph.
The Jeep is not electronically speed limited (scary) but aerodynamically limited top end.
The stocker will top out at 167 mph+/-.
I sure as hell will not take my ride that fast.
Oh the trannys....the Jeep is obviously a W5A580 platform with a couple of upgrades and a couple of cost reductions. The case is designed off the diesel 4wd W5A580, tiny change in the bolt on section in back for the transfer case.
BTW, the JEEP can NOT change shift rpm or line / shift pressure electronically in the TCM.
It is with in a few weeks of happening however.
Bill
Super Member
Joined: Sep 2006
Posts: 537
Likes: 0
From: San Jose, CA
Charger SRT-8
Super Member
Joined: Sep 2006
Posts: 537
Likes: 0
From: San Jose, CA
Charger SRT-8
btw, i wish my race weight was 3800lbs!!! unfortunately, it's about 4300lbs. obviously, a 1.71 is not impossible since i've done it as often as i have. i'm not the only one either as there are a few others. actually, i believe enzom may even have a few 1.6x on his street tires launches. ironically he and i have discovered we both use identical launch techniques, something i have tried to get others to use, including the srt8 guys. for some reason, not many people listen and still try to use outdated techniques they learned while driving 30yr old muscle cars. as far as what's more impressive, my post on dragtimes was meant to be honest not impressive, and on that particular run i was using the d/r's.
While highly skeptical (obviously), I'm very eager to learn a better technique so I can be a believer and within a month, proven example
Super Member
Joined: Jun 2008
Posts: 514
Likes: 1
From: Sarasota
CLK550
I have an ML63 and have raced numerous SRT8 Jeeps. The Jeep does launch better, but I ALWAYS catch up around the 1/8th mile mark, and after that, there is no comparison. The ML wins every time.
In regards to CLK55s, The first week I got the ML, I raced my cousins CLK55 W209, and he was annihialated. Since the Jeep is so close in performance with the ML63, chances are, you have no chance to keep up with the Jeep in a CLK55.
Here is a video of me Murdering the CLK and keep on pulling the whole time.
http://www.youtube.com/watch?v=jYVOMdFNF_c
This is just another perspective for the you guys.
Here is a video of what happens when a Jeep tries to race my Benz too
http://www.youtube.com/watch?v=K3fcfbrgyds
In regards to CLK55s, The first week I got the ML, I raced my cousins CLK55 W209, and he was annihialated. Since the Jeep is so close in performance with the ML63, chances are, you have no chance to keep up with the Jeep in a CLK55.
Here is a video of me Murdering the CLK and keep on pulling the whole time.
http://www.youtube.com/watch?v=jYVOMdFNF_c
This is just another perspective for the you guys.
Here is a video of what happens when a Jeep tries to race my Benz too
http://www.youtube.com/watch?v=K3fcfbrgyds
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
http://www.300cforums.com/forums/srt...tml#post446298
it's been discussed many times here as well but i basically get away from the muscle car method of brake torquing to increase rpms and lowering tire pressure. it's a die hard myth that that technique works like it used to with modern drive by wire cars (at least until we can get around the computer and add a high stall).
anyways, i run around the recommended tire pressure (for me that's 36psi) to maintain a uniform contact patch. running low pressure does nothing for modern street low profile radials except reduce contact patch...it doesn't soften the sidewall or widen the tire. do a short DRY burnout to slightly heat the tires and clean any debris. launch off idle instead of stalling the converter. i believe the ecu's don't know what to do when the brakes and throttle are applied at the same time and it will limit power long enough to reduce launch performance. throttle application at launch is a very quick mash rather than a slow roll or a stomp. i ussually leave esp on just in case i screw up. obviously track prep has to be good to get a 1.71 on street tires, but even if it's non existent i can still manage 1.8's.
Last edited by chiromikey; Aug 26, 2008 at 01:47 AM.
Thread Starter
Banned
Joined: Jan 2008
Posts: 551
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2003 Mercedes S500 Lorinser
test drove the srt8 jeep which was my cousins. And i can say that thing launches really hard and sucks you into the seat until about 60.
its fast from a dig, but thats where the fun stops.
the exhaust note is sweep but the ride is handling is complete crap and the brakes feel like crap also.
my ford f350 turbo diesel stops better and has more pedal feel lol.
after 60 the car feels so unstable like its gonna lift off the ground and it moves side to side.
nothing like a german amg for sure. the clk55 at 60 to 120 still pulls me hard into the seat, where the jeep is lacking and still way behind.
all i can say is that it would be a close race against the ml63 and the clk55 as it would be even until triple digits where aerodynamics would work in the benifit of the clk
its fast from a dig, but thats where the fun stops.
the exhaust note is sweep but the ride is handling is complete crap and the brakes feel like crap also.
my ford f350 turbo diesel stops better and has more pedal feel lol.
after 60 the car feels so unstable like its gonna lift off the ground and it moves side to side.
nothing like a german amg for sure. the clk55 at 60 to 120 still pulls me hard into the seat, where the jeep is lacking and still way behind.
all i can say is that it would be a close race against the ml63 and the clk55 as it would be even until triple digits where aerodynamics would work in the benifit of the clk
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From: City with Tall buildings!
C43/55,2k11 Volvo S60 T6AWD,2k Audi B5 S4,95 Eagle Talon Tsi AWD 500+awhp
i don't feel like search my entire post history over there looking for the few posts that i discussed launch technique but here was a post i did remember discussing because i believe nyc srt8 learned the technique from some of us mb guys.
http://www.300cforums.com/forums/srt...tml#post446298
it's been discussed many times here as well but i basically get away from the muscle car method of brake torquing to increase rpms and lowering tire pressure. it's a die hard myth that that technique works like it used to with modern drive by wire cars (at least until we can get around the computer and add a high stall).
anyways, i run around the recommended tire pressure (for me that's 36psi) to maintain a uniform contact patch. running low pressure does nothing for modern street low profile radials except reduce contact patch...it doesn't soften the sidewall or widen the tire. do a short DRY burnout to slightly heat the tires and clean any debris. launch off idle instead of stalling the converter. i believe the ecu's don't know what to do when the brakes and throttle are applied at the same time and it will limit power long enough to reduce launch performance. throttle application at launch is a very quick mash rather than a slow roll or a stomp. i ussually leave esp on just in case i screw up. obviously track prep has to be good to get a 1.71 on street tires, but even if it's non existent i can still manage 1.8's.
http://www.300cforums.com/forums/srt...tml#post446298
it's been discussed many times here as well but i basically get away from the muscle car method of brake torquing to increase rpms and lowering tire pressure. it's a die hard myth that that technique works like it used to with modern drive by wire cars (at least until we can get around the computer and add a high stall).
anyways, i run around the recommended tire pressure (for me that's 36psi) to maintain a uniform contact patch. running low pressure does nothing for modern street low profile radials except reduce contact patch...it doesn't soften the sidewall or widen the tire. do a short DRY burnout to slightly heat the tires and clean any debris. launch off idle instead of stalling the converter. i believe the ecu's don't know what to do when the brakes and throttle are applied at the same time and it will limit power long enough to reduce launch performance. throttle application at launch is a very quick mash rather than a slow roll or a stomp. i ussually leave esp on just in case i screw up. obviously track prep has to be good to get a 1.71 on street tires, but even if it's non existent i can still manage 1.8's.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 2,895
Likes: 53
From: Maryland
'14 E63S & '14 Audi SQ5
Funny thread...I agree!
I've got a SRT8 Jeep with a Dana 44 front (TRUE posi) and a 9" Ford rear diff (TRUE posi) and it launches pretty hard.
With stock diffs the Jeep does a "2 wheel peel", the left front and the right rear tires spin, not so good when you add some additional power.
Mine is a built 426 so I had to design a front & rear diff to get a true positraction front and rear.
Bottom line, from a dig it is pretty quick, you guys pass most of us by the 1/8 and we won't catch most of you again until we pass 155 mph.
The Jeep is not electronically speed limited (scary) but aerodynamically limited top end.
The stocker will top out at 167 mph+/-.
I sure as hell will not take my ride that fast.
Oh the trannys....the Jeep is obviously a W5A580 platform with a couple of upgrades and a couple of cost reductions. The case is designed off the diesel 4wd W5A580, tiny change in the bolt on section in back for the transfer case.
BTW, the JEEP can NOT change shift rpm or line / shift pressure electronically in the TCM.
It is with in a few weeks of happening however.
Bill
I've got a SRT8 Jeep with a Dana 44 front (TRUE posi) and a 9" Ford rear diff (TRUE posi) and it launches pretty hard.
With stock diffs the Jeep does a "2 wheel peel", the left front and the right rear tires spin, not so good when you add some additional power.
Mine is a built 426 so I had to design a front & rear diff to get a true positraction front and rear.
Bottom line, from a dig it is pretty quick, you guys pass most of us by the 1/8 and we won't catch most of you again until we pass 155 mph.
The Jeep is not electronically speed limited (scary) but aerodynamically limited top end.
The stocker will top out at 167 mph+/-.
I sure as hell will not take my ride that fast.
Oh the trannys....the Jeep is obviously a W5A580 platform with a couple of upgrades and a couple of cost reductions. The case is designed off the diesel 4wd W5A580, tiny change in the bolt on section in back for the transfer case.
BTW, the JEEP can NOT change shift rpm or line / shift pressure electronically in the TCM.
It is with in a few weeks of happening however.
Bill
Tom
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
forgot about that...yes, the trans is in drive. i've tried to best the auto trans but i just can't do it. there's too much lag between the shift buttons and the when the car actually shifts which makes it difficult to be consistent.
Former Vendor of MBWorld
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From: In a box
W211 E55
Yeah, sure you do. 
And you still referenced a 60ft that was done on ET Streets.
And how is that virtually every other 1.7X 60ft was on DRs on dragtimes? If the E55 launches so well, why in the world would they use DRs?
I had no idea the E55 can launch like a 3100lb prepped Z-06. And prep as in clean tires, fresh application of VHT, psi at optimum level, etc.
And you still referenced a 60ft that was done on ET Streets.And how is that virtually every other 1.7X 60ft was on DRs on dragtimes? If the E55 launches so well, why in the world would they use DRs?
I had no idea the E55 can launch like a 3100lb prepped Z-06. And prep as in clean tires, fresh application of VHT, psi at optimum level, etc.
Toyo T1R, 30 PSI, street trim. 11.59@~119
There's a LOT you have no idea about.
Super Member
Joined: Sep 2006
Posts: 537
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From: San Jose, CA
Charger SRT-8
i don't feel like search my entire post history over there looking for the few posts that i discussed launch technique but here was a post i did remember discussing because i believe nyc srt8 learned the technique from some of us mb guys.
http://www.300cforums.com/forums/srt...tml#post446298
it's been discussed many times here as well but i basically get away from the muscle car method of brake torquing to increase rpms and lowering tire pressure. it's a die hard myth that that technique works like it used to with modern drive by wire cars (at least until we can get around the computer and add a high stall).
anyways, i run around the recommended tire pressure (for me that's 36psi) to maintain a uniform contact patch. running low pressure does nothing for modern street low profile radials except reduce contact patch...it doesn't soften the sidewall or widen the tire. do a short DRY burnout to slightly heat the tires and clean any debris. launch off idle instead of stalling the converter. i believe the ecu's don't know what to do when the brakes and throttle are applied at the same time and it will limit power long enough to reduce launch performance. throttle application at launch is a very quick mash rather than a slow roll or a stomp. i ussually leave esp on just in case i screw up. obviously track prep has to be good to get a 1.71 on street tires, but even if it's non existent i can still manage 1.8's.
http://www.300cforums.com/forums/srt...tml#post446298
it's been discussed many times here as well but i basically get away from the muscle car method of brake torquing to increase rpms and lowering tire pressure. it's a die hard myth that that technique works like it used to with modern drive by wire cars (at least until we can get around the computer and add a high stall).
anyways, i run around the recommended tire pressure (for me that's 36psi) to maintain a uniform contact patch. running low pressure does nothing for modern street low profile radials except reduce contact patch...it doesn't soften the sidewall or widen the tire. do a short DRY burnout to slightly heat the tires and clean any debris. launch off idle instead of stalling the converter. i believe the ecu's don't know what to do when the brakes and throttle are applied at the same time and it will limit power long enough to reduce launch performance. throttle application at launch is a very quick mash rather than a slow roll or a stomp. i ussually leave esp on just in case i screw up. obviously track prep has to be good to get a 1.71 on street tires, but even if it's non existent i can still manage 1.8's.
Also, are you running with a full tank of gas? Your race weight seems high and I've noticed a 1/3 to 1/2 tank is needed for a good weight transfer (with my car).
MBWorld Fanatic!
Joined: Jun 2006
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'03 E55, Range Rover Sport Supercharged, Ducati 748R
Okay, I'm doing a similar method but please describe the difference between a "very quick mash" vs. a "stomp"??
Also, are you running with a full tank of gas? Your race weight seems high and I've noticed a 1/3 to 1/2 tank is needed for a good weight transfer (with my car).
Also, are you running with a full tank of gas? Your race weight seems high and I've noticed a 1/3 to 1/2 tank is needed for a good weight transfer (with my car).
i typically race with as little gas as possible...1/8 tank at the most. this is another myth that has to be let go with our cars. i don't know if it applies to the srt8's, but the e55's gas tank(s) are mid ship so more fuel does not equate to more rearward bias or weight transfer over the rear tires.
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S63 COUPE M157
http://www.youtube.com/watch?v=TeBPz7Xgwto
Top speed is 165MPH.
Super Member
Joined: Feb 2006
Posts: 669
Likes: 81
S63 COUPE M157
SRT8 vs ML63AMG: 0-120MPH
http://www.youtube.com/watch?v=lgIXutLYGXc
2nd run, 0-125MPH:
http://www.youtube.com/watch?v=tVQNi8o5maE
Jeep SRT8 vs E60 M5:
http://www.youtube.com/watch?v=RsNyxcXbvX4
And last one > Jeep SRT8 vs Cayenne Turbo S :
http://www.youtube.com/watch?v=SyyDWv6_8Oo
Better videos:
ML63 AMG vs Cayenne Turbo S:
http://www.youtube.com/watch?v=9kBHpHBYFiU
Modded 500BHP JEEP SRT8 vs ML63AMG:
http://www.youtube.com/watch?v=ZSUxNpgM1AI
http://www.youtube.com/watch?v=lgIXutLYGXc
2nd run, 0-125MPH:
http://www.youtube.com/watch?v=tVQNi8o5maE
Jeep SRT8 vs E60 M5:
http://www.youtube.com/watch?v=RsNyxcXbvX4
And last one > Jeep SRT8 vs Cayenne Turbo S :
http://www.youtube.com/watch?v=SyyDWv6_8Oo
Better videos:
ML63 AMG vs Cayenne Turbo S:
http://www.youtube.com/watch?v=9kBHpHBYFiU
Modded 500BHP JEEP SRT8 vs ML63AMG:
http://www.youtube.com/watch?v=ZSUxNpgM1AI
