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Discussion Starter #1
Having a hard time figuring out why the car won't launch with the new auto and larger turbo. Here's the deal.
New trans with semi low stall 2800RPM
big hybrid turbo only pulling 6psi at 2800 torque braking. Engine RPM will slowly climb when brake release and slowly build boost. Once it get's past say 3500 it's a rocket 25psi tires spinning but it launches like a 2.0 Neon would. The car is getting dynoed this weekend to get the bugs worked out but this is bothering me. It's almost like it needs a higher stall or a trans brake or something. Timing is dead nuts. On the street from a roll it will shread 1st and second gear and start to spin in 2rd at 25psi. From a dead stop a bicycle would be faster.
Any ideas. We are planning on going to the track in 2 weeks after the intercooler piping and cage are installed.
This one has me stumped.
 

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I'm not a big launch expert or anything, but I'd bet that it's the fact that you're leaving the line at 6psi. Personally, I don't mind leaving the line at 6psi IN MY STOCK T1 LOG CAR.:thumb:
I think a lot of the guys run a HIGHER stall convertor to get the exhaust flow up and spin the turbo up faster. Why'd you pick a lower stall unit?
 

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3.0 acclaim said:
low stall speed. turbo hasnt spool enough yet. get a 2 stage and up your launch boost or your stall speed.
+1.. Stall is way too low for a hybrid. you need 3500 or so stall
 

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What is your final drive ratio? You either need to launch at 3500rpm or higher, or achieve at least 12psi on launch, or preferably both. I have found leaving with the auto to be every bit as tricky as a manual but once you find the right technique it is fun :D
 

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Hmm

I had a problem like this once, turned out to be that the cam timing was off.

Once we fixed it, it ran great, didn't change anything else.

bc
 

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turbo2z said:
Engine RPM will slowly climb when brake release and slowly build boost. Once it get's past say 3500 it's a rocket 25psi tires spinning but it launches like a 2.0 Neon would.
My car does the same thing, Ill check my timing this weekend.

thatsbc:
How off was your timing?
 
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