2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Quest For Power S5 TII

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Old 02-04-09, 03:18 PM
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Quest For Power S5 TII

I'm just finishing up rebuilding my TII and I am planning on keeping my factory turbo...Whats the Max psi i can push before i start blowing more hot air than anything???

And my second question is what size injectors should i use when just uping the boost on the stock turbo???


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- Project-Z
Old 02-04-09, 03:33 PM
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Originally Posted by Project_z
I'm just finishing up rebuilding my TII and I am planning on keeping my factory turbo...Whats the Max psi i can push before i start blowing more hot air than anything???

And my second question is what size injectors should i use when just uping the boost on the stock turbo???


Thanxxx
- Project-Z
this gets brought up once a day.

the answer is 10 psi, 12 psi if you're feeling gutsy (and you have a front mount)

you should be fine with 550 primaries and 720 secondaries. you need something to control them with though...
Old 02-04-09, 04:03 PM
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Engine, Not Motor

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12 PSI is about the limit when you've done the basic fuel upgrades. After that, intake temps skyrocket. 14 PSI on the stock cooler and you'll be seeing 150 degrees...
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