I changed my spark plugs to NGK-BPC7ES (advanced auto said they won't fit my vr4 ) and got some MSD 8.5mm wires. I was getting spark blow-out at 11 psi before. And we went to "tune" my car. I was able to blow 18.5 psi (yes on pos 9B turbos) without any knock and got close to 100% injector. and at 19.5-20 psi I blew intercooler hose, fixed that and ran again, blew another one and fixed that one. Now everything should be holding good, and will leave it @ 18 psi for racing and 12 psi for regular driving.

now I just need TC bracket to take it to the drag strip.

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From Brixton Prison, Jebb Avenue London S.W. 2 Inglan

ummm aren't 9bs blowing hot air after 15 psi?

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www.rockauto.com

The tree of liberty must be refreshed from time to time, with the blood of patriots and tyrants.

I was told they are, but I would like to know how hot. with DSM intercoolers and no knock. every time when I'd turn up the boost a little, car would get a little more "tork" at mid rpms, but I'd end up at 10psi around 5500 or 6000rpms any way.

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From Brixton Prison, Jebb Avenue London S.W. 2 Inglan

IIRC if you have the fuel you can push 9Bs to about 17psi efficiantly. Not sure what the plugs you ran are but I've heard to run BKR7ES-11s.

9bs will be WAY out of efficency at anything over 15 to 16ish psi.

Not to mention when you work the turbo that hard, you are asking for early failure do to bearing problems... probably not quite as quickly on the water-cooled turbos, but it will happen eventually.

If they are the stock turbos that came with the car, I say screw it, run what you can get, and if you blow a turbo, it's a great excuse to upgrade...

However, I'd bet that you are probably not making any extra power, as you are moving the same mass of air.

You'd really have to be on a dyno and run it at say 15 and then again at 18 to know for certain... And I could very well be wrong, just the way I think it will work out.

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Bad decisions make good stories.
Look at it! LOOK AT MY @SS AND TELL ME IT'S PRETTY!

Well if you feel like a little light reading

http://www.stealth316.com/2-3s-compflowmaps.htm

Looks like 9bs are at peak efficiency at around 14psi on a stock engine.

that is what I was thinking. I don't care about turbos too much. they are old and need to be replaced. But I'd like to see the diff on a dyno. hopefully sometime this summer.

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From Brixton Prison, Jebb Avenue London S.W. 2 Inglan

You are running E85 right?

oh yes. on 93 with that boost on stokers I'd be "saving the pieces" of my engine.

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From Brixton Prison, Jebb Avenue London S.W. 2 Inglan