molex wrote:It seems to me that more turbo lag as a cure for wheelspin seems a bit backwards, if the goal is to go as fast as possible surely you'd be wanting boost (and thus torque) across the widest rev range possible? If you can attain your power goals (and it certainly sounds like you can) with a smaller turbo then I'd say go for it.
I agree 100%, with a smaller turbo you have more control over the way the boost comes on. With a bigger turbo if you are drag racing you have to give it more revs and more throttle to get the turbo going, making it more knife edge - smaller turbo responds quicker and if you set the car up right and drive it right you should be able to go quicker. Same goes for track.
Why exactly are you looking at changing turbo, if you don't want a responsive turbo and you don't want more power? If I had a 2litre 6cylinder engine which I wanted to make a good amount of power out of with some semblance of response I'd got with a .78a/r twin scroll GT3071R which should see you being able to delve well into the 200rwkw area, getting near 300. I would make sure you have a properly design split pulse manifold for it.
I have a GT3076R and it would be quite laggy and then come on really violently on a 1GGTE with a .63a/r turbine housing, with a .82a/r it would be a bit more laggy but less violent. .63 is good for a bit over 300kw @ wheels, .82a/r is good for a few more than 300kw @ wheels so more than you are looking for.