Cubes

I had a similar thing heading in the opposite direction a couple years ago. Pulling out of blacks/flaggy hill round about on to blacks road heading towards south road a bloke with his goatie and a beanie in a old HZ V8 manual Holden pulled right up my arse. I could not see his wipers. I gave it a little hit up to the speed limit only to have him fly up my arse again. I let him sit up my arse. Turned left on to South road off blacks road gave it a little squirt. Pulled up at the next set of lights to have him pull up next to me starring over reving it. Gave it a little hit to the speed limit. He kept holding it down flew past nailing it through the S-bends past looking extremely dodgy. I came around the bend to find a 4wd with a trailer pulled out in front of him. I measured he slid a good 100m and 'slightly' tapped a tree on the medium strip with a branch over his bonnet/windscreen. No real visible damage to the car but as I drove past to see what the commotion was he was absolutely freaking out so give him the big middle finger up. Sucks to be him. Sounds quite similiar.. Goatie + beanie. Will have to keep an eye out. There's bugger all XB/XC white ford utes around. Its not only just an issue with imports.. I think its an issue with performance cars. Back in 99 I had a VS 5ltr 5speed lowered with mags sherbrook green looked sounded damn nice. Driving along commercial road at Pt. Noarlunga I had some bogan and his mate pull up next to me in a red VN v6 for no reason and try swinging a mini base ball bat at the car. I didn't stick around obviously. Was quite funny how I got rid of him. Accelerated up to 80km/h I let him over take to get up side by side. I slammed the brakes and ducked off right down the side street to see him overshoot and lock it up and throw a u-turn. Looped around back on to commercial and continued on my merry way as he went looking down the side streets for me.

Where do you get 244duration? IVO of 14.06 & IVC of 60.55 gives you 254 duration? When rbman ran those cams he picked up 26rwkw on around the same boost, peak power rose by 400rpm and it held on to that power until close to 7500rpm. Even though my cams are larger the lca's shift the power considerably to the left.

Simon had to really push some overlap in to it to work good the size cams are really better suited to the rb30 that essentially soak up the cams. Unless that is you like the lopy idle then they are worth it. rbman has had some good results with his 254 8.5mm lift cams. 214duration @ 0.050" still quite an aggressive ramp rate. Exhaust centreline is slightly different that aids top end. Mine at 115degree's has pushed peak power to the same 6000rpm and drops ~10rwkw by 7000rpm. BUT its not a true indication as mine is showing an inlet restriction issue. Std airbox/filter combined with 2" fmic piping. I am absolutely wrapped with mine to be honest. It has really free'd up the motor feels so much more alive. Rolling on the throttle in third gear at 60km/h.. by 70km/h its pulling so hard and pushing the nose in to the air I feel like its going to break something.

The RB30 is a bigger motor so it makes more torque which = more power at the same rpm. The less you rev a motor the longer they last. Typically 7000rpm out of an rb30 is good for 700hp (~450rwkw). Much more and you need to start looking at extending the rev limit which is as easy as a set of forged rods, pistons and balancer. Then 8-8.5k is not a problem. Rev's are a bad thing for longevity.

Nothing to do with rev's.

I had mine tuned.. no issues with boost creep but plenty with boost drop. Pushed in 19psi through the mid that would tail off to 17psi by peak power. Tuner seems to think its airflow restricted. 2" FMIC piping + smallish FMIC + std airbox as the almost certian culprit. 3" bell mouth dump. Power jumped to 302rwkw at 17psi massive mid range gains (~260rwkw at 4000rpm) that actually hooks up damn well due to the progressive nature of the gt30 + the boost controller setup sedately.

As its only running 4-5degree's overlap the idle is smooth. Its deeper and overall the exhaust is deeper and more throbby sounding. Definitely doesn't sound like a regular rb20 or 25det. Push in 5degree's advance to the inlet and it will lope like buggery. I am running 20degree's static ignition which helps smooth idle when running bigger cams. Generally richer afr's + more ignition timing will smooth an idle. Leaner afr's and less ignition timing and it will lope. But with mine.. ~5degree's overlap regardless if its running retarded or lean afr's it still idles smooth.

standard r32 rb25de (240 7.8mm inlet - 232 7.3mm exhaust) regrinds these days are $380.

Not surprisingly the rb20det turbo simply could not keep up. 176rwkw on 9psi boost would just not hold from the 12psi straight off the actuator with no boost controller.

Did you compare the boost run to make the same power. My Rb20det turbo used 6psi less boost with the 25 head on the rb30 to make the same power. bubbabooga/Titan. The std RB26 pump is the RB25det pump. The N1 pumps internal gears are hardened but this is because there is less meat. Hardened = more brittle so more likely to smash when loaded unevenly via a short crank oil pump drive and bouncing off the limiter. :S

Could always be a GT3040? or otherwise known as the GT3082. Basically the same arse end i have with the GT35r front end. Regardless. Its not the source of your issues as those turbo's push 300rwkwfairly easy. My bet is the wastegate setup. Its nasty your better off with a Garrett internal gate housing with a larger flapper. Run a spring close to the boost pressure you intend to run as even ext gates will still be blown open.

Cams always help make the power easier.. Don't overcam it. I was a little nervous 265's were a little too big but Shaun has had good results with that type of duration on fairly stock rb30det's previously so I went with his advice.

Tighe regrind it was. I stumbled upon a list of HKS, Jun and LCA's but be buggered if I can find it. I do remember the Rb20det's definitely had the same 110 and 115 LCA's when running in the 264 duration range. Rb25's.. 115/115.

Got pics of the turbo? I don't believe there's such a turbo with the chra 706451-5015 The GT3076r - http://www.turbobygarrett.com/turbobygarre...R_700382_12.htm GT3582R - http://www.turbobygarrett.com/turbobygarre...2R_714568_2.htm I run the GT3076r .82 IW and made 268rwkw on 15psi std exhaust manifold std inlet std cams. Recently dropped a set of Tighe regrinds 265/263 9mm lift cams in and it is now at 302rwkw 17psi.

By grind.

Regardless of the size of the cams the way they are setup they run less overlap than the R32 RB25DE cams (8degrees) I previously had in there. From memory they were 240duration inlet 7.8mm lift and 232duration 7.3mm lift. Inlet had an LCA of 112 degree's and exhaust 117 or 118degree's. Being a total of approx 8degree's overlap. The new cams... Inlet LCA 110 exhaust 115. Overlap is 4-5degree's so even though they are bigger cams they are setup with bugger all overlap. The Inlet LCA and exhaust are exactly the same as how JUN or HKS I believe setup their RB20DET cams. Less overlap helps turbo spool improves bottom end which is most likely why I have not lost any fuel economy or low/mid power yet still picked up decent top end due to the 265duration and 9mm lift. I presume. :S Still got some tweaking to do it was only on the dyno for approx 1hr. It wasn't worth spending any more time on it as the FMIC is crap and causing problems. Most likely the IW 1bar actuator is not able to hold much more. Much the same as the problems Dangerman4 experienced with his IW garrett housing. Needs a nice stiff actuator.

I've just came off the dyno with mine.. RB25 hydraulic head though. Tighe cam regrinds 265in 263exh 9mm lift 221deg at 0.050". 200rwkw at 3500rpm and 256rwkw at 4000rpm @ 19psi boost then tails off quickly to 17psi where it makes 302rwkw at 6000rpm. The cams have lost absolutely nothing down low its picked up power everywhere with its std centrelines inlet 110 LCA, Exhaust 115 LCA 112.5 LSA which = around 4-5degree's overlap. Have yet to play with adj cam gears. We had a few issues pushing more boost in.. It simply would not boost any more than 17psi over 5000rpm. Suspected a combination of the 1bar crappy Garrett actuator + 2" FMIC piping with a small 450x300 fmic. --- RB26 cams from memory are around 236 duration with ~8.5mm lift. In short.. RB30's definitely respond to Cams.

Thats a silly question... E85 haha + FMIC with 2.5" piping. The cams have really woke the car up.. Right off idle it feels much more responsive, spools the turbo earlier etc. I must admit I was a tad scared the 265/263 9mm regrinds would kill low end but its been the complete opposite. Best thing.... I've just pulled 400km's out of a tank and almost a 1/4 of that tank was on the dyno!!

Will do soon need to scan it

WOOT.. 302rwkw 17psi Best part though... 3500rpm = 200rwkw 4000rpm = 265rwkw Comes on super smooth no snapping and actually really easy to get the power down. The 2" FMIC piping and 450x300 small FMIC was causing a few issues and wouldn't allow us to push more than 17psi in to it up top. Not to replace the fmic and its 2" skinny arsed piping

I'm all for DETT.. I would if I could. Linear power better turbo response due to smaller wheels/less inertia. Unless its all out drag I personally would not bother with a big single. Twins improve throttle control compared to a similar sized big single. The singles hit harder create wheel spin that causes drive ability issues out of corners. Nissan didn't go to the additional expensive of developing parallel twins on their track warrior because twin turbo sounds cool.

Slightly modded. HKS 2510 turbo's. Once up around 4k its quite nice but 3.5k under it feel a little dead. They feel really linear and smooth with no real bottom end just a constant increasing pull until peak. The nature of twins. Even the stock units are laggy though.. BUT that is in comparison to my own setup which I have grown to. Compared to a 20t yeah definitely the 26 is a torque monster. The r33 rb25det feels more torquey IMO BUT they do have a much smaller turbo.

You could never look back.... If I were to upgrade I would definitely have to drop a rb30 in to it as the lack of torque and how laggy it felt from the one that I drove was quite disappointing.

Blame the French. I said that to an older bloke who started talking about the New GTR at a local auto store... Only to offend as he was French. lol.

All the rb25det's I've known to last have had the headgasket done and a set of cams to make 300rwkw reliably.