I've read the turbo size selection section in corkys Bible about 50 times now, and everytime I think I've got the same idea of what I'm doing with the numbers.
Basically I've run the numbers the best I can understand to obtain what I'm looking to get out of the turbo and I know that I'm doing something wrong because every turbo that you all are using in the T3 series shows on the map that its WAY off the page for the flow and pressure ratio.
I know more than one of you are running the China Charger T3/T4 turbo which I was going to buy, advertised specs of it are T3/T04E with a .63 turbine 62 trim wheel, .50 compressor with 48 trim wheel.
To the point: Found in a box in my attic an AiResearch Garrett turbocharger that I've had sitting around for about 10 years now and noticed a few things about it. Its non-gated turbine housing of .63 ar, unknown wheel trim, the compressor is a T3 40 trim. Obviously that compressor housing and wheel are not optimal for what I'm trying to do, infact its pretty tiny. It has < 2" inlet on it.
Looking on Turbonetics website I've found some TO4E compressor wheels and housings that should work on my turbo, along with a backing plate and I've got around $300 invested after the upgrades. My problem is, I can't figure out for sure what TRIM to get for the compressor.. They list 40, 46, 50, 54, 57, and 60. Here again, my math fails me as every one of those compressors comes up way out of range on the map for each unit. Not really sure what I'm doing wrong, looking for some advice from someone thats more sure of what they're looking at in this department.
Theres a lot of variables in this equation and at this point in time I'm not really 100% sure what I'm trying to do.. but I know I'd like to make over 250rwhp (with room to grow,) would like threshold around 3000rpm, spin the motor to 7000.. Engine displacement should be about 2 liters when I'm planning on this turbo. Is that asking too broad of use from a small displacement turbo?