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Originally Posted by 93/01alaLUDE
i agree w/ everything hypsi87 said except dont base your decision on how much boost youre expecting...when going for a turbo goal you should base it on 2 things...your budget and a target hp..dont base on a certain psi b/c the turbo determines the power produced at certain psi's...a t3/t4 will produce more power at 10psi than a t25 will at 10 psi..a smaller turbo will produce less air flow therefore less power. Like hypsi87 said do some research...dont turbo until you know how it works and what you expect to acheive
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You need to know what PSI vs. airflow range you you will be running to select the proper turbo. Yea a larger turbo will produce more power at 10 psi than a smaller turbo but, look at the compressor maps. A big turbo at 10 PSI on an engine, that can't support the ammount of flow that the bigger turbo was made for, will be on the verge of compressor surge. Where as the proper size turbocharger will be flowing the correct ammount of air at 10 PSI. Look at the compressor maps. It will show you.