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Finally took my build to the track after updating TC with UPD 3000 HSTC and a fresh dyno tune. Got my PB time slip with 11.4, 1.5 60 but, trap speed is still sucking 115mph.
In November, I ran a 11.6, 1.6 60, 115mph without the updated mods but with 68 fsp.
Im very happy with shaving off 0.2 and a nice 60 footer, its the trap speed that frustrates me. Gonna change out the original SC tensioner and send pulley out to griptec hoping its just belt slip.
The HSTC felt amazing on launch, like a rocket from low to mid ends but top end just felt weak like car was on 5th gear over drive.
have following mods: 72mm FSP, 82mm TB, LTH, x pipe no cats, 550 cc injectors, BWK, upgrade superflo ic pump, dyno tune by HD Tuning, split cooling, 5 gallons trunk tank with Rule 2000, KnN filters, 3000 High stall torque converter, C63 mufflers, & Killer Chiller with Drag Kit. DR: 16 CLK Wheels with MT et street rear and spare skinnies fronts with MT.
At Fontana Speedway PB but 115mph??? Dash Command data at end of run.
IAT stayed below 120 November slip without HSTC or dyno tune.
I am not a racer but what gear were you in and what rpm were you at across the line? ,,, consider 2:82 or 3:06 diff gears to move the shift points/revs ? and faster shifts --- just a thought during morning coffee
Your times sound pretty damn good! Your car sounds like my set up. I have a canned tune, 185 lower pulley stock upper. Stock mufflers along with the other mods you listed. Mine did a 1.58 60ft. 10.39 @134 but it was being sprayed.
Nice et but something is going on up top... Which is weird considering your IAT stayed so low. My bone stock e55 ran a full second slower but same trap
Your trap is at least 5mph low, indicating you are making torque but not HP. What were your dyno numbers? I never heard of your tuner. Could the problem be in the tune? What is your intake/air filter setup?
Last edited by E55Greasemonkey; 02-21-2020 at 12:59 PM.
Your trap is at least 5mph low, indicating you are making torque but not HP. What were your dyno numbers? I never heard of your tuner. Could the problem be in the tune? What is your intake/air filter setup?
thanks G! Ive ran three different tuners (RaceIQ, DTK, and now dyno tune) and trap speed all the same. HD Tuning is a local tuner here in So Cal, very popular with AMGs owners here. He got my rwhp to 515 and 583 lbs of torque. Gained 75hp at 4k rpm and 50hp at 4.5k compared to base pull with DTK Tune.
i have stock intake with KnN filters, theyre about ten years old filter.
Your times sound pretty damn good! Your car sounds like my set up. I have a canned tune, 185 lower pulley stock upper. Stock mufflers along with the other mods you listed. Mine did a 1.58 60ft. 10.39 @134 but it was being sprayed.
I dont have the KC or TC.
thanks T! So frustrated with trap time, Im thinking belt slip. Didnt see boost over 12 psi. Car have 189k miles, work horse!
Maybe time for a compression check- I just nervously did mine @ 153k but all was good
@ 178psi +- on all 8 cylinders. Last time out ran 11.6 @ 121mph in 60F weather, but 160F IAT's at the end of the track. 153k miles it's a road warrior!
Last edited by E55Greasemonkey; 02-21-2020 at 03:07 PM.
Forget the et, your trap speed sucks for such a good 60 foot time which gave you a reasonable et. I have basically the same mods but have 125mph through the traps with a 2.0 sec 60foot.and 11.4 sec et. I would be in the 10's with a 1,5 sec 60 foot.
Could try log timing maybe its pulling because your getting knock up top? With those nice iats it should be nice and high with only 3.5 pulled after 95f iirc.
Hows the transmission do you think the torque converter is giving up? Did you replace the solenoids, conductor plate and inspect the pump (known to fail time to time) when installing the 3k stall?
I was having the same issues. Let the car sit for a few hours when you get to the track and only move it when you have to. Regardless of iat I would run 5 mph slower when car was thoroughly warmed up. You have belt slip, I have very similar setup and on the street I would see 18 psi up top with 68mm but at track only 14.
With the high stall doing a burnout and the quick rev up in 1st it roasts the belt and it doesnt grip right after. Switching to a fixed pulley with clutch delete to see if that helps.
You can tell your belt is slipping from your base pull with DTK tune, torque dips at 3500 and goes back up at higher RPM as the belt begins to grip more. Your IATs gain is too low, if the car was making the right boost you should see a 30-40 degree rise even with a killer chiller during the 1/4 mile run. Then your dash command logs, assuming they were at full throttle at the end of the run you're only making 1 psi more than stock, you're supposed to see about 15.5psi with a 72mm pulley.
Cant say how much I appreciate all your inputs! Im really hoping its just belt slip and nothing major.
As mentioned, Ive ran RaceIQ, DTK, & the recent dyno tune and all three got the same results of trap speed of 115-118; a common denominator. I mostly run on S mode with ESP off.
Will be swapping SC tensioner assembly and sending pulley to griptec, is there any other remedy to prevent belt slip? Both belts been changed two weeks ago.
I plan on swapping to a 68mm fixed pulley and getting a dyno retune. Would my tuner be able to tell if belt is slipping?
I was having the same issues. Let the car sit for a few hours when you get to the track and only move it when you have to. Regardless of iat I would run 5 mph slower when car was thoroughly warmed up. You have belt slip, I have very similar setup and on the street I would see 18 psi up top with 68mm but at track only 14.
With the high stall doing a burnout and the quick rev up in 1st it roasts the belt and it doesnt grip right after. Switching to a fixed pulley with clutch delete to see if that helps.
Could try log timing maybe its pulling because your getting knock up top? With those nice iats it should be nice and high with only 3.5 pulled after 95f iirc.
Hows the transmission do you think the torque converter is giving up? Did you replace the solenoids, conductor plate and inspect the pump (known to fail time to time) when installing the 3k stall?
PieRat! I just changed the C plate only, after the high stall was installed back in December, had issues with speed sensors prior. Im not getting issue with tranny since plate was changed.
my tuner supposedly bypassed the first stage of timing pull at 95. Is that a good thing?
very carefully lately i just bring it up between 1800 or 2000rpm and roll into it before flooring it. that will get me into the 1.6 range. Most of the time my car will short shift the 1-2 shift in the 4500 to 5500 rpm range why i do not know.
it comes up so fast alot of times i bounced it off the rev limiter. its a fluke thing with my car maybe changing a conductor plate and a valve body would help.
Cant say how much I appreciate all your inputs! Im really hoping its just belt slip and nothing major.
As mentioned, Ive ran RaceIQ, DTK, & the recent dyno tune and all three got the same results of trap speed of 115-118; a common denominator. I mostly run on S mode with ESP off.
Will be swapping SC tensioner assembly and sending pulley to griptec, is there any other remedy to prevent belt slip? Both belts been changed two weeks ago.
I plan on swapping to a 68mm fixed pulley and getting a dyno retune. Would my tuner be able to tell if belt is slipping?
If you're slipping with a 72mm you will slip worse with a 68mm. Are you running a Gates RPM belt?
Tuner should be able to tell the belt is slipping by monitoring boost, if you're not seeing ~15psi with 72mm pulley you're slipping or have a boost leak.
very carefully lately i just bring it up between 1800 or 2000rpm and roll into it before flooring it. that will get me into the 1.6 range. Most of the time my car will short shift the 1-2 shift in the 4500 to 5500 rpm range why i do not know.
i just mashed it at the line with DR it dead hooks. Are you running DR?
02-21-2020, 02:19 AM
