Car feels slow: do numbers disagree?
Thread Starter
Senior Member
Joined: Mar 2006
Posts: 333
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From: Berkeley, California
2005 E55, Renntech Pulley, ECU
Car feels slow: do numbers disagree?
Hadn't been in the beast for a while, been busy making ugly commutes that i wouldn't subject her to. Usually after a two week break, the car feels CRAZY fast. Mind you the contrast is with my commuter lane beater, a CNG powered Crown Victoria, so you'd expect to be blown away getting back in the torquemonster.
But it almost feels the way it did when the S/C pump was failing. Could all be in my head, traffic hadn't allowed enough open road. So yesterday I fired up Dynolicious on my iPhone, went to a remote frontage road and did some 0-60 focused runs (from a dig) to get some objective data.
I was running a full tank and loaded trunk, and the road was pretty bad (rutted, rough, an occasional patch of loose gravel). I felt weak on launch, trouble controlling wheel spin. Nevertheless, I turned consistent 4.5-4.7 0-60 times.
Should I be disappointed? With Renntech pulley and ECM, fresh PS2's, should I be in the low 4's instead? Or is this good for a sub-par road and a half-dozen runs under 4.7 (despite heat soak). I dare not run the 1/4 on this road. Not enough room, not safe enough.
Cop paranoia kept me from really dialing things in, messing with settings, shutting off T/C, etc. I wanted to make a half dozen runs and leave the rarely traveled road with no intersections asap.
Let me know if I need to get her back on the Dyno and look into more mods (TCU/Cooling/etc), or if I'm where I ought to be all told.
Sorry for the long rant!
Skeeter
But it almost feels the way it did when the S/C pump was failing. Could all be in my head, traffic hadn't allowed enough open road. So yesterday I fired up Dynolicious on my iPhone, went to a remote frontage road and did some 0-60 focused runs (from a dig) to get some objective data.
I was running a full tank and loaded trunk, and the road was pretty bad (rutted, rough, an occasional patch of loose gravel). I felt weak on launch, trouble controlling wheel spin. Nevertheless, I turned consistent 4.5-4.7 0-60 times.
Should I be disappointed? With Renntech pulley and ECM, fresh PS2's, should I be in the low 4's instead? Or is this good for a sub-par road and a half-dozen runs under 4.7 (despite heat soak). I dare not run the 1/4 on this road. Not enough room, not safe enough.
Cop paranoia kept me from really dialing things in, messing with settings, shutting off T/C, etc. I wanted to make a half dozen runs and leave the rarely traveled road with no intersections asap.
Let me know if I need to get her back on the Dyno and look into more mods (TCU/Cooling/etc), or if I'm where I ought to be all told.
Sorry for the long rant!
Skeeter
Last edited by Skeeter; Jun 24, 2009 at 02:33 AM.
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Joined: May 2009
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From: Abu Dhabi
C218 CLS63TT PP Edition1, W213 E63S
i feel my car has the same issue. even an E63 beated me in a race. couple of times ><
i feel there is something wrong with my car
my freind has an E55 stocke but removed the primeris and resonators. and he is next to me >< from nill to 220km @@
i feel there is something wrong with my car
my freind has an E55 stocke but removed the primeris and resonators. and he is next to me >< from nill to 220km @@
Thread Starter
Senior Member
Joined: Mar 2006
Posts: 333
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From: Berkeley, California
2005 E55, Renntech Pulley, ECU
Ali,
Have you used a Gtech similar performance meter, or better still gone to the track since you felt this decrease? Have you had your S/C pump replaced? If not that's a first step and primary culprit.
But what is normal 0-60 time for real world conditions, less than optimal, on a 85 degree day?
Thanks,
Skeeter
Have you used a Gtech similar performance meter, or better still gone to the track since you felt this decrease? Have you had your S/C pump replaced? If not that's a first step and primary culprit.
But what is normal 0-60 time for real world conditions, less than optimal, on a 85 degree day?
Thanks,
Skeeter
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From: Abu Dhabi
C218 CLS63TT PP Edition1, W213 E63S
I replaced the pump to the new onw, the S/C doesn't shut off
I know how it feels because I had it before
But even after tuning, I don't feel it is a WOW tuning
All checkings are good
Did my last service and there is no problem showing
How can I test my s/c pressure ?
Should I return it back to the tuner !
I can't imagne an E63 beating me while my car is tunned
I know how it feels because I had it before
But even after tuning, I don't feel it is a WOW tuning
All checkings are good
Did my last service and there is no problem showing
How can I test my s/c pressure ?
Should I return it back to the tuner !
I can't imagne an E63 beating me while my car is tunned
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From: Daytona, Florida
SL600
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211-55
Don't let those 0-60 times get you too worked up. There's too many factors involved with high torque, non-AWD cars. I've run a best 4.5 seconds stock (easing onto throttle), and a worst in 6.6 (mashing throttle w/ESP on) just minutes apart. Even with only the stock amount of torque, traction will always be an issue. A better test would be something like a 30-100mph run but being near Berkeley myself I don't think there's many roads where you can try that.
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From: Houston
2003 W211 E55, 2003 W220 S600
Ali_e55 you can measure your boost via an obdii scanner and look for the MAP reading. You may have to convert it into psi.
CCW you are right about s/c cars feeling slow in this heat. These days I don't even get on the gas due to ambient temps being in the 90 to 100.
After iats hit 140 timing is pulled by 9 degrees every degree pull in timing represents a 8-9 hp in lost power.
CCW you are right about s/c cars feeling slow in this heat. These days I don't even get on the gas due to ambient temps being in the 90 to 100.
After iats hit 140 timing is pulled by 9 degrees every degree pull in timing represents a 8-9 hp in lost power.
MBWorld Fanatic!
Joined: May 2009
Posts: 1,484
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From: Abu Dhabi
C218 CLS63TT PP Edition1, W213 E63S
well to be honest .. the temp was 35C when i raced. >< and that was @ 11:00pm
u know how it is middle east
so do u say it is because of the heat ?!
could it be that dealer reflashed my ECU !!
u know how it is middle east
so do u say it is because of the heat ?!
could it be that dealer reflashed my ECU !!
Former Vendor of MBWorld
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From: Houston
2003 W211 E55, 2003 W220 S600
to see if the dealer has re flashed your ecu, hook the car up to STAR and look at the ecu re flash table, it will tell you if and when the ecu was altered.
