t4, t04b, t04e...???
09-23-2003, 05:20 PM
#2
0.0 BAR
Join Date: Aug 2003
Posts: 22
Re:t4, t04b, t04e...???
For a 1.6Lt engine -- even a high-reving, high-volumetric efficiency Honda engine. It is hard to see where a turbocharger larger than a T3-60trim is necessary. All the t3/T4E-50trim recommendations only make sense at very high boost and rpm (like +30psi boost +9000rpm). For a street driven 1.6Lt (with max.boost 15psi and max.8000rpm) a T3-60 is fine.
I use a T4B-S3 trim compressor(smallest T4 compressor) and a T3-stg3 turbine in 0.63A/R housing on my 2.5Lt 6-cyl. BMW 325is. (I say again) a T4 compressor is not needed on a 1.6Lt street driven engine.
Kevin
I use a T4B-S3 trim compressor(smallest T4 compressor) and a T3-stg3 turbine in 0.63A/R housing on my 2.5Lt 6-cyl. BMW 325is. (I say again) a T4 compressor is not needed on a 1.6Lt street driven engine.
Kevin
09-23-2003, 07:09 PM
#3
Guest
Posts: n/a
Re:t4, t04b, t04e...???
ok well the smaller t4 comp housing with the 54 trim wheel i think would be perfect but i need someone with some experience to shed some light...i previously ran a 48/60 t3 and i think i might need something bigger on the compressor side...although i might just go with a 60 trim like you said, im just seeing what the different sizes are...i dont care about lag on the street, i need whats best for the track at about 20 psi
09-23-2003, 10:35 PM
#4
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:t4, t04b, t04e...???
Originally Posted by ghettoturbo
...i dont care about lag on the street, i need whats best for the track at about 20 psi
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09-24-2003, 08:22 AM
#7
0.0 BAR
Join Date: Aug 2003
Posts: 22
Re:t4, t04b, t04e...???
I would suggest changing your turbine housing from 0.48 to 0.63 -- that will free up the exhaust side and let the turbo build more boost at the top end (but with a bit more lag). That swap (I did this on my 2.5Lt engine and it helped significantly -- for me the 0.48 was so small changing to 0.63 did not even increase lag) will cost about $300 using new parts from Turbonetics (or maybe you can find usable piece from an 1986 Mustang SVO).
A T3-60 (based on compressor map and 1.6Lt engine) should boost to 20-psi (ie a pressure ratio of 2.7 = (14+20)/14 at 70% efficiency with corrected mass flow of 30 lb/min To reach this high of mass flow on a 1.6Lt requires a good intercooler as well as generous volumetric efficiency assumptions, and 8000rpm at 20-psi boost). Yes a T4E compressor can boost to 20-psi at 76% efficiency, but is the added cost of buying a new turbo ($1000 or more) worth it to you?
To go beyond T3-60 on a 1.6Lt engine seems to me (in all but the most extreme performance cases) is done mostly for bragging rites.
Kevin
A T3-60 (based on compressor map and 1.6Lt engine) should boost to 20-psi (ie a pressure ratio of 2.7 = (14+20)/14 at 70% efficiency with corrected mass flow of 30 lb/min To reach this high of mass flow on a 1.6Lt requires a good intercooler as well as generous volumetric efficiency assumptions, and 8000rpm at 20-psi boost). Yes a T4E compressor can boost to 20-psi at 76% efficiency, but is the added cost of buying a new turbo ($1000 or more) worth it to you?
To go beyond T3-60 on a 1.6Lt engine seems to me (in all but the most extreme performance cases) is done mostly for bragging rites.
Kevin
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