Originally Posted by Fred_B
Think of the turbo delay just like the gearing in a real car. If you shift too early the engine will bog down and not much will happen until the engine hit's it's powerband. Shift later when the revs are up and it will pull a lot harder in the next gear.
Running too much boost is just like skipping a gear and it will take some time to spool up and go.
It's all a balance and it's probably best to gear without turbo first and then tune in the turbo a little at a time to get tuned in. Full boost full turbo and minimum delay may not be the way to go.
Good advice! I think this is a common misconception. Adding timing is adding revs, but reducing torque. If you add the revs too soon, the torque is lost and the motor cannot gain speed - it will bog down and not spool up smoothly.
If you find that the turbo kicks in late, then reduce the boost. As I understand it, and have experienced it, the motor adds a fixed amount of timing throughout the rev range, starting at zero revs. Use this to increase acceleration off the turns.
Next, the boost comes in, at some point in the rev range, and adds a bit more timing. This always seems to work fine, and I have not had any hesitation during acceleration.
Next, the turbo comes in. This adds yet more timing, but it comes in after a time delay, not at a certain amount of rpm. If the motor has not finished spooling up using the boost, then the turbo just adds in more timing, reducing the torque, and the motor cannot spool up smoothly - it just bogs down.
Already on here the best advice has been given. Randy said to sort out your motor timing, boost and gearing first, and then add in turbo a bit at a time. Maximum 'attack' on the boost and turbo at the same time will cause more problems than it solves.
Cyanyde then won a T shirt from Randy for this quote:
"If you feel the turbo is coming in late on the straights, it may be that the
delay is set to come in too soon, causing the motor to lose torque and
unable to use the extra timing until it reaches a certain speed. Experiment
by turning off turbo first, then see how long the car takes to reach top
speed without the turbo. Use that time as the turbo delay. You wanna
make use of all the available torque without the turbo first. This will give
you optimum acceleration."
It's clear that when finding settings, you need to do motor timing, gearing and boost first, then make with the turbo settings last. HTH