Vacuum on RB20?

[omp]

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

[Skyrine-Dave]

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

[CHCH_gtst]

sounds more like cam timing problem, retarded inlet cam maybe?

[Cubes]

The RB20's are sluggish off boost.

Slower than the SR20's anyhow. But once on boost (3500rpm) they pull nicely.

The RB20 has it over the SR20 in the top end. Lower to mid range the SR20 is a little stronger.

[omp]

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

[Cubes]

I'd still check all of the vacuum hoses for little splits.

[omp]

It's got brand new hoses, every single one. Thanks again for your feed back we'll see what mechanic say's tommorow after the turbo is changed.