A4 SI guys? Launch help
I have 3.73s and a 4000 stall...car weighs in around 3100lbs...all the bolt ons
!sway,!bumper supports, LCAs, SFCs, 255mt drag radials....I can't get this thing to leave with better then a mid 1.7 60` 18psi in the tires.
Track was well prepped tried rolling into it...launching at different rpms...had a few other people drive it...It hooks then 60`s 1.7ish pushing it harder just causes wheel spin.
Time for more suspension? suggestions?
330 5.236
1/8 8.083
MPH 86.70
1000 10.524
1/4 12.582
MPH 109.59
Before the stall it was running 12.6 108-109..with 1.81 60`s
Maybe Fuddle converters are very inefficient?
Car dynoed 343 wheel before the stall..which means **** because I care about track times..
Last edited by mshadow; Aug 26, 2007 at 11:18 PM.
I guess I will get some rims and go the 15inch QTP route next season.
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p.s. if this doesnt work, u definetly need another tire!
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I bought 255/55/16s which are the smae specs at my street tires.
M/T's website was a big help as I've never used drag radials and honestly never had a car that could do a burnout before
Okay stop laughing now. First car at the track was a '04 Grand Prix 3.8L n/a that ran 16.2 @ 87mph with just a generic mail order tune and the mighty K&N CIA.
Basically the M/T website said to heat the tires up really good on your very first burnout with them to start a even wear pattern, scuffing up the whole surface of the tires.
Get a good amount of smoke rolling off them, but you don't need to put John Force to shame while doing so.. power hard out of the burnout box and you should hear the tires hook up and squeal.
Wait till the starter motions for you to pull up to stage. Do a single, quick dry hop to ensure the tires are going to hook nicely.
Immediately stage while the tires are still warm!
If you or the other guy dicks around reving the engine or farting around, your tires will cool down and you'll loose traction out of the hole. If this is the case, you'll have to feather the launch a bit so you're not blowing the tires off and pulling a 3.5s 60' accomanied with a funny car style burnout. Ask me how I know!
You'll have to feather the petal slightly too if your dry hop yeilds spinnage as well.After you get the very first burnout taken care of, the rest of your burnouts should be enough to see the tires smoke easily in your back window. Again power hard out of the hole and try a dry hop if you like. (its optional but give you a good idea of what your launch will be like)
As far as how high to take the rpms's up.. you might have to just try different ranges and see what works best for you.
I would think the higher the rpms you can stall the car to at the lights, the faster the converter will reach its flash point and dish out the power.
My car is almost bones stock with only a 3200 vig stall, SLP FLowPak and 3" cats/hi-flow muffler. Stock internals and programing with 140,000km's on the clock. Race weight is a portly 3700lbs including 195lbs of me.
While staging I can take the car upto around 26-2750rpms before the brakes won't hold the the car inches through the beams and I cut a .150 red light... ask me how I know this too!
My best 60' has been 1.79.The tired dead hook every time as long as the track is dry and preped. =\
All this info may meen nothing new to you in which case I've wasted my time *L*
But hopefully it helps someone!
-Get it tuned
-flash it from 2K or below
Putting a bigger tire on at this point is a crutch. Unless you are running a 4.30 or numerically higher gear in the rear, there is no need to go to anything bigger than a 26" tire. And don't waste your time with the ET Streets or QTPs. Go with a MT or Hoosier drag radial or full slick.
Are you on stock suspension? Adding LCAs, torque arm, and some shocks in the front will help a lot! Have you had the car tuned for the converter? I shift mine at 6300 and it seems to really shine up top. And I would flash the converter if you are not running on a pro tree. My Yank PT4400 likes to be flashed rather than brake stalled.
Lots of weight out of the car, and what little suspension work I have done helps too. All I have done suspension wise is SFC's, Non-Adjustable LCA's, and a Non-Adjustable Jegster TA. I've pulled 1.75x's on street tires.
A great deal of getting the car out of the hole is learning the car. Not every car is the same, learn yours and reap the rewards.
Lots of weight out of the car, and what little suspension work I have done helps too. All I have done suspension wise is SFC's, Non-Adjustable LCA's, and a Non-Adjustable Jegster TA. I've pulled 1.75x's on street tires.
A great deal of getting the car out of the hole is learning the car. Not every car is the same, learn yours and reap the rewards.
You're certainly not going to run the same times @ 5000' elivation as you do @ 500'.
Best 60' time I could get on street tires were 2.0s.
Best 60' time with MT drag radials is 1.81s.
Dead hook, no hop.
I can't hold the car past 2700rpm or the brakes won't hold the front end and I push slowly through the lights.
Leaving on the 3rd yellow on a Full Tree = .300 red light
330 5.236
1/8 8.083
MPH 86.70
1000 10.524
1/4 12.582
MPH 109.59
Before the stall it was running 12.6 108-109..with 1.81 60`s
So after puttin the stall converter in it only picked up .02 and 1mph? Sure the converter is good?


