1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

T4 or T3 turbo...

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Old 02-19-03, 10:04 PM
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T4 or T3 turbo...

Which would better suit my 12a street port:
T3, T04, or a eclipse t25?

I can get a T3 for $100 with these specs: A/R .42 turbine side A/R .48
I could also get a brand new T-04B15 for $350 A/R 60 size intake housing

matt

Last edited by someone82; 02-19-03 at 10:17 PM.
Old 02-19-03, 10:56 PM
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T3=Too small.
Old 02-19-03, 10:58 PM
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Most T3s are too small. The 2nd gen turbos are like .8 or something on the exhaust side. You should look at like T04s or something. Search the 2nd gen forum for the turbo sizes, then find a turbpo close to that size.

~T.J.
Old 02-19-03, 11:07 PM
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1.15 on the exhuast side of a t4? would that be too big?
Old 02-19-03, 11:10 PM
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Originally posted by someone82
1.15 on the exhuast side of a t4? would that be too big?
Not if you're an Aussie.
They like those huge "drag-only" turbos on everything.

I think that's gonna lag too much for street use.
Try a .96 or smaller.
Old 02-20-03, 01:15 AM
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Like I said, .88 or whatever the 2nd gen turbos are...

~T.J.
Old 02-20-03, 03:27 AM
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hey you need to stop by the shop!!!! all your questions will be answered!

p/s did you fix your alt/ reg. problem?
Old 02-20-03, 09:59 AM
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Just one runner of the s4 turbos are .8, the combined total of the two is 1.0 (I can't remember which booket I read it in) but just the A/R doesn't tell you a whole lot.
Old 02-20-03, 11:28 AM
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a stock s5 turbo would work well on a 12 streetport.

I will have one to sell soon.
Old 02-20-03, 12:54 PM
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Most people on a ported motor use higher A/R ratios on turbine.... the t3 with .42 A/R would just suck, don't even consider it. T04's with .88 - .96 A/R is probably what you should be looking for.
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