MPH consistant ET all over the place, WHY???
08-31-2014, 09:54 AM
#1
MPH consistant ET all over the place, WHY??? Car is in my sig.
Super Vic and FAST 4150 TB.
SD Tune.
Best ET is a 10.11 @ 131.22 also ran a 10.20 @ 132.66 that night in April.
In May it ran a 10.30 @ 134.28, best MPH.
When to the track last night, 90 degrees and high humidity, made 3 passes.
All passes were 131.xx mph.
Et's were 10.60, 10.71, 10.89.
Could it be the heat and humidity for all the high 10's?
The car MPH right at 131-132 year round, but why do my ET's vary so much, 10.11- 10.89?
These are still shakedown runs.
Can't get the car to 60. Best was a 1.46. No reason this car shouldn't 60 in the low 1.30's. Still need to play with the shocks, maybe loosen up the converter.
Super Vic and FAST 4150 TB.
SD Tune.
Best ET is a 10.11 @ 131.22 also ran a 10.20 @ 132.66 that night in April.
In May it ran a 10.30 @ 134.28, best MPH.
When to the track last night, 90 degrees and high humidity, made 3 passes.
All passes were 131.xx mph.
Et's were 10.60, 10.71, 10.89.
Could it be the heat and humidity for all the high 10's?
The car MPH right at 131-132 year round, but why do my ET's vary so much, 10.11- 10.89?
These are still shakedown runs.
Can't get the car to 60. Best was a 1.46. No reason this car shouldn't 60 in the low 1.30's. Still need to play with the shocks, maybe loosen up the converter.
08-31-2014, 10:45 AM
#2
mph will pretty much stay the same on a car as long as you don't lift or miss a shift, that's why if you track tune you tune by mph not et, et is affected by a lot of other factors your 60 ft being the biggest one a tenth difference in 60 foot can change your et by 2-3 tenths while keeping the same mph, the da at the track can also change you et which from the looks of when you made your passes could be some of the reason your et varies so much
08-31-2014, 07:44 PM
#3
Something is amok there... if its hotter or worse DA for any reason heat , humidity , barometric pressure you should lose power which will in turn drop trap speeds , et's getting worse but trap speeds staying up/consistent in warmer temps something doesn't add up?
Seeing 60 foot & 1/8 et & trap for some of these passes may help isolate where the problem lies - launch , mid pass or top end ( top end not likely due to good traps)
Are you experiencing wheelspin or worse 60 foots in general coinciding with the solid trap/higher et passes?
Or can you see a weaker 1/8 et on the weaker 1/4 passes?
Seeing 60 foot & 1/8 et & trap for some of these passes may help isolate where the problem lies - launch , mid pass or top end ( top end not likely due to good traps)
Are you experiencing wheelspin or worse 60 foots in general coinciding with the solid trap/higher et passes?
Or can you see a weaker 1/8 et on the weaker 1/4 passes?
09-01-2014, 04:31 PM
#6
10 Second Club
Just going over this with a converter builder....seems to think my converter is broke with me having those same issues....being all over the place.
Last edited by Doug G; 09-01-2014 at 04:38 PM.
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10-08-2014, 09:57 AM
#8
On The Tree
Join Date: Feb 2006
Location: Oaktown, CA
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There is no mystery. Speed is inherently more consistent than ET because ET depends upon more variables than speed. Achieving consistent ET is difficult. ET can be 2 minutes with no loss of speed.
Last edited by Hector; 10-08-2014 at 10:12 AM.
