Quote:
Originally Posted by Humdizzle
dyno doesn't tell you throttle response
when you punch it in a g80 the turbos aren't spooled. you are only getting a 3.0 liter 6 cylinder's power. after a short delay the exhaust gasses from the engine have spooled the turbo, which is causes it to compress air into the engine and now the engine can make more power
this is what turbo lag is.
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This is exactly what is happening with the G80. By hitting it from a 5mph roll, you take away G80s ability to launch because you can't brake stall the torque converter to build boost for a killer launch. Rolling at 5mph and the G80 is caught in low rpms and off boost. There will be a noticeable lag before the turbos ramp up to compensate for lack of load against the motor.
Turbos need load to build full boost. It's also why turbos don't generate full boost in 1st gear. There's simply too much torque multiplication in 1st gear (i.e., less load on the motor to accelerate). Yes, the S58 can theoretically generate max boost below 2,000rpms, but in order for that to happen, the G80 would need to be in a tall gear. It ain't happening in 1st, especially from a 5mph roll. No amount of electronic wizardy can overcome this effect.