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Vacuum on RB20?

omp

By omp,
in Engines & Forced Induction

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omp Collaborator

omp

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Hello, I have an RB20 that has just been rebuilt (standard). I also have a Auto meter boost gauge, when I had the CA in my 180 (RB is now in the 180) the gauge used to read around the 20Hg. Now it reads around 10-15Hg, is this about right or is there something wrong? The car hasn't had the intercooler hooked up yet, as I have had other drama's with it. To cut a long story short I had to get the car on the road and the intercooler piping will be done soon. The RB feels sluggish down low but I have so far diss-missed this to the microtech not being tuned yet. So what vacuum should I be running? Any help would be appreciated thanks Pete

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Skyrine-Dave Mentor

Skyrine-Dave

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i think it may be overfueled and putting load on the engine.

Mine used to sit on 22inHg, then i fitted larger injectors and turbo and it sits on 500rpm idle and 10-15inHg vacuum. Currently so rich my mums hyundai would whip my ass!

short: You need a tune, or that intercooler fitted, IMO.

Dave

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omp Collaborator

omp

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Funny about the cam timing because I did have that problem! When I first got the car going it had no power at all, the guy who rebuilt the engine scratched his head so I sent it elsewhere. It initially got diagnosed as faulty ECU hence microtech. It then got diagnosed as cams miss-aligned, Inlet cam 3 teeth retarded, exhaust cam 2 teeth advanced!

I like Skyrine daves response as it sounds cheaper to fix (hahaha), as my car is, well is there anything above overfueling? I get at the moment 250-300km a tank!

Thanks for your responses Pete

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