turbo trim and A/r size

[kalescio]

whats the best turbo size to use for my ka with stock compression and forged internals (aftermarket).

[C-Kwik]

That's not an easy question to answer. Actually not that it's hard, but it's dependent on application and goals. How much boost you run, what kind of response you want, Are you running more than one boost level(street/strip set-up), etc. are all parameters that are important to know before an opinion can really be given. Having Forged internals and stock compression doesn't mean much in terms of picking a turbo. Ideally, you want to have a turbo that is most efficient in the area where you want to boost most often or with the most gain in power. Compression only dictates the efficiency of the combustion event and affects the detonation threshold. Being forged just means it's more durable, particularly in resisting damage when exposed to detonation. Perhaps, you can give us an idea of the results you want to see and we can start to point you in the right direction.

[kalescio]

I wanna run about 20 psi from about 3000 to 4000 up to 6500.I want quick response but i know running 20 psi will have some lag. I plan to run 25psi at the track and 20 daily driving

[Drift Machine]

I wanna run about 20 psi from about 3000 to 4000 up to 6500.I want quick response but i know running 20 psi will have some lag. I plan to run 25psi at the track and 20 daily driving

Are you saying you want to be hitting 20 psi by 3000 RPMs???

[kalescio]

i meant spooling at 3000-4000 and full boost later

[sil80drifter]

What are your goals?

So far I heard 20 psi. Do you know what HP you're looking for? more importantly, do you know what work needs to be done to a KA for that HP number? Your question is similar to something like "what car is best for me" I think you can do better than that, so first off, try to figure out what you want. After that anyone of us will be glad to suggest ways towards that goal.

sil80

[kalescio]

im lookin for about 400 rwhp with a safc, 660cc injectors, and turbo cam ( dont know specs on cam yet)

[1998cc]

Your gonna need something to control those injectors instead of an s-afc. I reccomend a e-manage or a JWT ecu.

[C-Kwik]

The S-afc and E-manage use a similar method to account for different sized injectors. The limitations of both as far as injector size should be the same.