BOOSTD

Would this be why some rb26 blocks leak coolant out the side above the oil outlet hole?(which is between 3-4) May explain why my radiator fluid looks like the Exon Valdize shipping lane and the coolant out the side of the block. btw. I'm not to fussed as I'm building a RB30/26 but I've seen a few rb26 motors with the leak out the side so this is quite interesting. I hope the rb30 doesn't have the same issue.....

The PFC does use fuel cut but for the rpm limiter only. Your problem sounds like "lean popping" which would explain why putting the fuel reg hose back on made it better as It would have richened the mixtures up. I think going to the Boostworx for a tune will fix your issue. So on the right track there. You can easily goto SETTINGS - INJ/IGN - then under IJN increase the value between 1.100 to 1.200 which will richen your mixtures by 10-20% across the whole band for a test to see if the issue goes away and hence proving a tune is required. The change will revert back to normal after the car is turned off. You could get smarter still and goto MONITOR - 2 CHANNEL - 1 RPM, 2 AIRFLOW - then press right arrow to record the max peak. Drive upto the point that it stutters and record the AIRFLOW voltage (should be between 3 and 4.5 volts) Then goto SETTINGS - AIRFLOW - R32 Standard - find the corresponding AIRFLOW voltage and increase the mixtures 5% at a time. The points upto 5volts will all most likely need to be increased by the same amount. Don't forget to leave the highlighted bar over the correct AIRFLOW meters type before backing out of the menu. this change will save to the new values. matt

I have used CP in all my motors, no problem at all. You can get them from the US on ebay for under $700 a set delivered.

There are two on ebay, one is a Pro aswell with handcontroller. $700 & $650

put compressed air in cyl 5 and a vac hose into cyl 6 up to your ear, should be a hiss for the head gasket leak. Otherwise broken ring lans between the top and 2nd ring only loose compression but won't leak hardly any oil until the 2nd to oil retainer skirt breaks.

2530. RB20's have pretty average response at the best of times. Expect 1.1bar @ 4000rpm and 230rwkw also at 1.1bar

I wouldn't use the SpecII profec B if it is the one with the blue screen. Its is an absolute pain in the butt to setup....really touchy. The earlier Profec B is the pick, or even just use the Power FC boost controller.

pretty sure R34 turbos also have the larger VG30 style turbine housing

As above

After a couple of hours, I have the T04S 52 trim at the top of my list. In comparison to the T04Vtrim I last used, It has a reduced surge zone, is more efficient at the low boost that I will run and will fit into the std compressor cover. I may look at the GT30R ported cover if there is a chance it will fit. I'm sure i'll get a better results in its native cover. Comments?

How was it proven to be the head gasket and not two broken pistons?

please reply to my pm

lol, disco you were actually my first point of call for any new idea's on a newer more efficient and surge resistant compressor wheel. The new style turbine wheel looks like the ones used in the GT-K Turbonetics Turbo's.

After 4 years this turbo is still running 15psi without any problems Just starting a RB20 version for a friend....will keep you all posted.

Yes the Gap induces lag It was balanced