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No doubt, mine isn't getting pushed at all and it's starting to get right up there power vs power rating wise.

I just find it hard to imagine a larger turbo on basically the same motor set up as mine and Jez's is making almost double the power at 4000rpm and a huge extra wack of hp top end... All while being on 99 octane fuel vs Jez and myself on E85

If I thought that graph was genuine and repeatable I would have already sent an email requesting an invoice for the purchase :)

Any thoughts on how it is possible? I agree, it seems unbelieveable - but there has to be an explanation! SAE doesn't inflate numbers THAT much unless the temp sensor is somewhere silly, perhaps.

Might have to check more MGT dyno results to see if they have other numbers which seem too good to be true - they are meant to be a reputable outfit.

<edit> I think I have found a trend :(http://www.gtr.co.uk/forum/176121-high-power-rb25s-mapped.html

Any thoughts on how it is possible? I agree, it seems unbelieveable - but there has to be an explanation! SAE doesn't inflate numbers THAT much unless the temp sensor is somewhere silly, perhaps.

Might have to check more MGT dyno results to see if they have other numbers which seem too good to be true - they are meant to be a reputable outfit.

<edit> I think I have found a trend :(http://www.gtr.co.uk/forum/176121-high-power-rb25s-mapped.html

Lol you are everywhere when it comes to turbo results :P

Probably wont be able to get much help here but what would you guys recommend for a n1 motor with vcam?

6262 .84 twin scroll seems to be the go for a 26 but with vcam would the 6266 be the better choice with a bigger rear (1.0+).

Car sees a little track mainly for street though and will be run on e85. Ideally I'd want 450awkw+

  • 2 weeks later...

i rekon a 6266 .84 divided rear would be choice

I got that same turbo on my built 26, still have standard cams, e85 etc getting tuned Friday so I can post up a graph then, will be good to compare to all the 6262 graphs getting around

Edited by SiR_RB

Update guys, The Old girl made 350kw 15 psi 430kw 24psi, 30psi made 436kw @ 6000rpm ignition prob the splitfires arent coping plus Im thinking the exhaust maybe holding it back 3.5 inch dump pipe 3.0 inch exhaust maybe to much back pressure we will check & see whats going on. Should be up around 500 plus in my eyes gate is vented straight out with screamer pipe. Need to iron out the little bugs then hopfully see some decent numbers.

Very nice mate!


When does this all start to happen, RPM wise?


I would have to agree that 3" is too small for any part of the exhaust when reaching for those power limits.. 500kw is basically 4" TBE zone.

Didn't it make good power on pump gas? If it can made 450kw on straight pump gas then it should be able to make a fair bit more than that on E85... if it isn't then the cause is more likely to be ignition or something along those lines.

to put it straight Lithium, The 450kw was on race fuel at autosalon with to4z .82 rear 24psi, was making 430 on pump98. Just its really bugging me that it seems stuck at 400 plus. In all Honesty it should crack 500 plus @30psi one would think engine sounds great. Did a comp test evrything is good 134,134,134,135,137,134. Thinking either LS2 coils or okada what your thoughts about the situation?

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