chrisking666

To be honest we didn't discuss it, like i said im new to rb26's and was not sure to expect but its obvious from the replys that there s something wrong. I will check timing etc and make sure its all ok but if anyone can advise of anything else to look for that'd be great!

Hi mate its not a t04z its a little bigger, its a 70mm billet which i think is getting close to a t51r kai the ex housing is a 0.81. and the boost controller is a Greddy profec B spec 2. Cheers

no cat either

Im new to GTR's and RB26's and ive followed some of your posts and know you know your shi't so i'll go and check the cam timing, i was quiet dissapointed with the power output myself as I have spent quiet a bit on a combo that i thought would make alot more HP. Im sure its not just in the tune and I agreee that in must have a problem somewhere hence asking on SAU. Cheers for your input, get back to you soon!

Ok so the motor has ross pistons, spool rods, main studs, head studs, steel head gasket, 4 inch dump pipe, profec b boost control, tuned two days ago by Matt at PITS, made 400 rwhp on 20 psi. Should make 650 -700 quiet comfortably when the cooler is changed. Reving it to 8500 as it only has a N1 oil pump. The biggest downfall i think is the standard intercooler atm. The other thing that needs to be changed it the rear half of the exhaust as it is only 3" but I dont think that is the cause of the lag. The turbo has a 0.81 exhaust housing aswell to try to keep lag to a minimum. If I cant get much of an imporvement with cam gear adjustment and cooler I think i'll have to go for a stroked rb30. But i'd like to try to improve this setup as its all brand new! Im also very aware of piston to valve clearances and retarding exhaust timing will only give the valves more clearance if anything. Thanks for everyones feedback

Edit on the first post, ment to say retarded the cam timing on the rb30!! not advanced it 1 tooth

So I just tried retarding the exhaust cam only, took it to 4 degrees on the cam so 8 at the crank, it definatly makes it boost earlier i'd say 500rpm and much more driveable down low like from a stand still. I should have the inlet cam gear tomorrow so i'll try advancing that gear a couple of degrees and see if that brings the midrange on harder and boost earlier again. Cheers

Hi guys and gals, so I have built a new forged RB26, with 270 10.8mm tomei cams and a 70mm billet turbo (slightly bigger than a t04Z), problem is its very laggy, it starts to make boost around 3500 1-2 psi but takes till about 5700 to get up to even 8-9 psi and then full boost of 19 at about 6500. I have adjustable cam gears and want some info on how advancing or retarding inlet/exhaust mght help my lag problem to make the car more responsive. Im quiet aware that big turbo = lag, but this is a bit frustrating. I had an rb30 with t04z and it would not come on boost with your foot on the brake and flat out on the gas standing still. We went drag racing and it ran a 13.6, spoke to a guy in the pits who said to roll the cam 1 whole tooth to advance the cam timing, next pass was an 11.1!!! It came on boost at least 1000 rpm earlier! So just want to know if it might work the same way with this engine. Any opinions would be appreciated.. Thanks Christian

Hi guys and gals, so I have built a new forged RB26, with 270 10.8mm tomei cams and a 70mm billet turbo (slightly bigger than a t04Z), problem is its very laggy, it starts to make boost around 3500 1-2 psi but takes till about 5700 to get up to even 8-9 psi and then full boost of 19 at about 6500. I have adjustable cam gears and want some info on how advancing or retarding inlet/exhaust mght help my lag problem to make the car more responsive. Im quiet aware that big turbo = lag, but this is a bit frustrating. I had an rb30 with t04z and it would not come on boost with your foot on the brake and flat out on the gas standing still. We went drag racing and it ran a 13.6, spoke to a guy in the pits who said to roll the cam 1 whole tooth to advance the cam timing, next pass was an 11.1!!! It came on boost at least 1000 rpm earlier! So just want to know if it might work the same way with this engine. Any opinions would be appreciated.. Thanks Christian

I have wired an Autometer tacho into my GTR using pin 7from the ECU, (yellow with red trace?) and the tacho will still not fire up. The Haltech is set up using the PWM output 1 as a tacho out and I have tried changing the out put voltage from 5v to 8 and 12v but no change. The tacho is probably an 03 model. An I missing something or is the tacho cactus. Any help would be appreciated and I've searched everywhere else! Cheers Christian

Hi mate have you sold the camshafts?? Thanks Christian

Like the title says I want to buy a pre built rb30 which was built for the single cam head, I want to know if you can direct fit the 26 head with the single cam pistons. Its going into a r32 gtr with the adaptor plate. I have just come across a cheap built motor with low k's. Any info would be great Cheers Christian