[redman007]

Hi guys,I want to make sure my engine is able to withstand the added pressures of a turbo but don't know what psi the compression should be min- max. I noticed #3 cyl. is lower than the others but no more than 10 %. the readings I got were with the throttle plate closed.I forgot to open it, oops! choking. so I'm going to do it again this time I'll open the throttle plate. I want to be sure "she can take some more power captain" before shelling out $ on turbo stuff and labor.

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91 SE-R,10:1 comp.pistons,balanced &blueprint rebuild.comp.4angle valve job,extrude honed heads/intake manifold,No emissions.crap,RC TB/MAF,nismo cams,UR pulleys,stillen4-1 ceram.header,nismo/centerforce dual fric.clutch,PR CAI,2 1/2 test pipe,mandrel 2 1/4 superturbo ex.,and a whole bunch of other goodies! boost is in the works ,hell yeah 3:16!

 

[CruznSER]

If you wanna stay with moderate boost levels, 10:1 comp is cool. But I'm sure he'll get bittin with the turn-up-the-knob-for-more-boost-despite-my-high-comp. bug in no time and will be wishing he had swapped his pistons sooner..

I'm jus assuming that since he was willing to go all out with his all-motor..and all of a sudden he wants to go turbo..he would want to go all out on his turbo set-up..but then again this is my ASSumption.

 

[CruznSER]

When you are going turbo, I hope you're also gonna swap the pistons back to at least stock 9.5:1 ....

 

[Bowlcut]

I would ask Mike Kojima or maybe Rob Cadle what would the cylinder pressures should be with the 10:1 pistons. Think it was mentioned on the list once so check the archives. But if you are pretty good across the board I dont think there should be a problem. Just want to get everything with the turbo, injectors, maybe a new fuel pump, and all the normal stuff.

Actualy I dont see why he couldnt stay 10:1 if he went mild boost. Like under 7 psi wouldnt be that bad, again Im not a turbo expert. If he kept the engine cool, modest boost levels, and watched the timing I dont see what the problem would be

 

[redman007]

the 10;1 pistons should be froma 300z
but the j-spec se-r has 10;1 compresion.J W said I could go as much as 8 psi on the t25 but he said toget the biggest most efficient ic so as to prevent detonation . should be good though. and being married limits the mod expense so I think this is it.then clutch and flywheel hope a stage 2 will do hope fully for good. I am still picking up stuff so this project is delayed for the fall so I can still have a car for the summer.