t3/to4 upgrade on 91 t2
Senior Member
Joined: Nov 2002
Posts: 325
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From: PF, MD
Since this is somewhat related, any suggestions on a quick spool turbo? (Keep drifting in mind, I just want power sooner in the lower RPMs. Don't really want to have to keep the engine wound all the time)
Junior Member
Joined: Jun 2003
Posts: 7
Likes: 0
From: Calgary, Alberta
I have been reading all this stuff on t3/t4 vs 60-1 and 62-1 and I have a question for everyone. A properly trimmer t3/t04e say, an 57/63 trim.. modest enough, how can this turbo flow enough CFM for 500hp on a 2 liter car... and your stock turbo's are running out at 350? You talk about heat and backpressure.. fine. BUT running a 62-1 at 12 psi isn't even up into the peak effiecency of a turbo that size.. therefore it is blowing extra heat (turbos generate heat anywhere outside effiecency, boost too high or boost to low NO?) and if that is the case you are counteracting the benefits of lower backpressure, by blowing hotter air back into the engine!
There is a huge fact about t3/t4 that nobody seams to take into account here. a t04b is tiny, t04e ( what I explained above) is large, and a t04s (the compressor on your 62-1) is huge. and these would all technically be t3/t4.. no one is specifying here. It seems like you are all talking based on heresay... someone show me the stock compressor map on the stock turbo vs a 62-1... then a the t3/t04e with the 57/63 trim. look where the effieciency ratings are. I am betting most people who are running thier huge turbos are running in the lower end of their eiffieciency, while if they had a slightly smaller t3/t4, they would be smack in the middle, make as much power, and spool faster. Does any off this make sense?
There is a huge fact about t3/t4 that nobody seams to take into account here. a t04b is tiny, t04e ( what I explained above) is large, and a t04s (the compressor on your 62-1) is huge. and these would all technically be t3/t4.. no one is specifying here. It seems like you are all talking based on heresay... someone show me the stock compressor map on the stock turbo vs a 62-1... then a the t3/t04e with the 57/63 trim. look where the effieciency ratings are. I am betting most people who are running thier huge turbos are running in the lower end of their eiffieciency, while if they had a slightly smaller t3/t4, they would be smack in the middle, make as much power, and spool faster. Does any off this make sense?
Originally posted by Nick_Berube
I have been reading all this stuff on t3/t4 vs 60-1 and 62-1 and I have a question for everyone. A properly trimmer t3/t04e say, an 57/63 trim.. modest enough, how can this turbo flow enough CFM for 500hp on a 2 liter car... and your stock turbo's are running out at 350? You talk about heat and backpressure.. fine. BUT running a 62-1 at 12 psi isn't even up into the peak effiecency of a turbo that size.. therefore it is blowing extra heat (turbos generate heat anywhere outside effiecency, boost too high or boost to low NO?) and if that is the case you are counteracting the benefits of lower backpressure, by blowing hotter air back into the engine!
There is a huge fact about t3/t4 that nobody seams to take into account here. a t04b is tiny, t04e ( what I explained above) is large, and a t04s (the compressor on your 62-1) is huge. and these would all technically be t3/t4.. no one is specifying here. It seems like you are all talking based on heresay... someone show me the stock compressor map on the stock turbo vs a 62-1... then a the t3/t04e with the 57/63 trim. look where the effieciency ratings are. I am betting most people who are running thier huge turbos are running in the lower end of their eiffieciency, while if they had a slightly smaller t3/t4, they would be smack in the middle, make as much power, and spool faster. Does any off this make sense?
I have been reading all this stuff on t3/t4 vs 60-1 and 62-1 and I have a question for everyone. A properly trimmer t3/t04e say, an 57/63 trim.. modest enough, how can this turbo flow enough CFM for 500hp on a 2 liter car... and your stock turbo's are running out at 350? You talk about heat and backpressure.. fine. BUT running a 62-1 at 12 psi isn't even up into the peak effiecency of a turbo that size.. therefore it is blowing extra heat (turbos generate heat anywhere outside effiecency, boost too high or boost to low NO?) and if that is the case you are counteracting the benefits of lower backpressure, by blowing hotter air back into the engine!
There is a huge fact about t3/t4 that nobody seams to take into account here. a t04b is tiny, t04e ( what I explained above) is large, and a t04s (the compressor on your 62-1) is huge. and these would all technically be t3/t4.. no one is specifying here. It seems like you are all talking based on heresay... someone show me the stock compressor map on the stock turbo vs a 62-1... then a the t3/t04e with the 57/63 trim. look where the effieciency ratings are. I am betting most people who are running thier huge turbos are running in the lower end of their eiffieciency, while if they had a slightly smaller t3/t4, they would be smack in the middle, make as much power, and spool faster. Does any off this make sense?
You need to use about 12.5lbs/min of airflow to equal 100bhp on an extend ported 13BT.
a t04b is tiny, t04e ( what I explained above) is large
For comparison, a T3 60 trim is a 1.83" inducer and 2.367' exducer.
Also, a To4B 60-1's peak efficiency is at 10 psi (1.8 bar absolute), and its still good at 15. Perfect for the street.
Last edited by eViLRotor; Aug 21, 2003 at 12:42 PM.
