Precision Billet Turbos

[SimonR32]

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

[Lithium]

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

[34GeeTeeTee]

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

[Lithium]

Dyno results full stop. Looking for combinations which work

[34GeeTeeTee]

Dyno results full stop. Looking for combinations which work

Arent we all?

[SimonR32]

Vipec logging of a drive I did home the other day... Shows loading up to 1 bar of boost in 2nd and 3rd

2nd Gear

3rd Gear

[sky30]

Is that a 6266?

What is your max boost you run and at what rpm?

[Lithium]

6262 I think, pretty impressive spool considering

[SimonR32]

Is that a 6266?

What is your max boost you run and at what rpm?

As Lithium said 6262. I run about 1.6bar for thrashing and 1.4bar at the track.

Got a full track day this Thursday so will try and pull some logs from that

[sky30]

Are 6262 generally lagier than a gt35?

Edited April 23, 2013 by sky30

[reaper]

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+

[SiR_RB]

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 May 7, 2013 by SiR_RB

[Ðemons]

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.

[GTScotT]

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.

[Ðemons]

around 4.2 she starts belting it out. Might just take the exhaust off & run it that way on the dyno see if that improves it at all.

[Lithium]

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.

[Ðemons]

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?

[GTScotT]

LS2 would be the cheapest and easiest.

They should hold what you want too.

[Ðemons]

What you tink guys these coils http://www.ebay.com.au/itm/Genuine-GM-Vortec-LS2-truck-D585-NEW-ignition-coil-/110954106127?pt=Motors_Car_Truck_Parts_Accessories&hash=item19d5614d0f or these http://www.ebay.com.au/itm/Smart-high-output-coil-spark-plug-wire-6-cyl-kit-NO-IGNITER-REQUIRED-/110991565133?pt=Motors_Car_Truck_Parts_Accessories&hash=item19d79ce14d Thoughts Please.

[34GeeTeeTee]

Wow, will keep an eye out for your results Dave... Impressive!