Contour Enthusiasts Group Archives Forums General Dyno and Drag Turbo Charged CSVTs, how to launch?

3 simple steps for you...

Clutch slip

Pedal modulation

PRACTICE!!!

Why do you think I converted to a 3L?


NO MORE issues with launching once I had the 3L installed, and I'm referring to pre-turbo days.
I can launch at 2 grand and just a tad clutch slip and not have any bogging issues. Once boost begins to build in the 3500 rpm range it is really a non issue because the onset can be so sudden that it will rip the tires free...at least with the 215mm tires. NOw I have 235mm so at 7psi it will hold once boost comes on.

You really can't do too much about the lack of low end grunt without changing displacement or changing cams.
You will have to pick your launch at a higher rpm and slip the clutch a bit more. As the clutch begins to bite you'll have to modulate the pedal. IF you try to modulate the throttle the engine will either push into serious boost and you'll break traction, or fall out of boost and bog, so it becomes rather tricky. Stick with modulating the clutch.
I just pick a 2500-2800 rpm launch point and slip the clutch in a little bit to keep the rpm up. The stage 3 clutch bites almost immediately when it is hot so it can be a [censored] to slip sometimes. An organic clutch is significantly easier to slip and launch.
Anyway, this gets the car rolling pretty easily without spooling the turbo too much and by the time the clutch slip is done and I let off the pedal I am at 3500 rpm and she is pulling hard. Above that you just hold on until the shift point comes...which is extremely quick and has caught me sleeping once or twice when it rev limits.

People who haven't driven a modified 3L or turbo 'tour with a Hi Po stage 3 type of clutch won't really understand the difference that just the clutch makes in the launch.
Worse, the bite changes with temperature. My clutch is very easy to drive when it is cool because it doesn't bite as quikly. It is smoother and slips easier. Driving it a while gets everything warm and then it has instant bite.

Well I think I have got it down being I had the turbo setup for over a year now. I will say that bogging the motor by dropping the clutch just kills your launch. It seems like it just floods the motor all at once and when the turbo really hits it just slamms the tires into a bad spin. I use to to slip the clutch before but since I made a soild motor mount on the rear I have no wheel hop at all. I now just launch at about 3000 rpms with slow clutch release but using only half throttle and one the cars tires catches up with the rpm from spinning. i then stomp it down the tires by this point are hot and sticky. I enter second gear spinning but the tires pull so darn hard even spinning that just about any car will not leave me by then. I hit third but with my azenis are on it just bangs hard with no spin. after this the car just accelerates ridiciousily fast.

This is the first winter I had my car running properly and with street tires I can just stomp on the gas in third and the tires break loose at 5k which is just amazing at speeds over 70. I am currently running 13 psi and I think my EGT letting me know that this is my limit without my water injection. Hope this helps some but you must let your tires spin somewhat throught the first two gears this allows you to use your power. Good luck you should breaks 12's with me soon.

hahahaaahhahah

its called wrong wheel drive for a reason


might I suggest a diffent boost setting in the first two gears. You are experiencing the same problem as a big single turbo ppoopra. No torque, then MASSIVE torque that moltens the rubber.

lower boost in gears 1,2 then high boost in 3rd.

i know my avcr can do it.

yeah no kidding. . .well, I didn't get an expensive boost controller, I just got an electronic greddy profec II something, so I'd have to do the switching as I drive!!! It would be ideal to have lower boost in the first two gears. . .I think Burrita has that set up. . .I've been practicing more, at 8psi actually, and I think it's more manageable with that much power. . .I'll then practice at 10psi, etc. . .

Suneil

as long as your have in car control

if i remember correctly, you have a button that you can mount on the steering wheel?


you can practice if you want, but one problem is, how much do you want to spend on tires