Question on max boost with a stock rb26dett

[NismoS-tune]

The r32 rb26dett compression number out of the factory is 171 psi. 140-160 psi is good for an rb26 that was never rebuilt with stock internals. I believe 117 psi is the lowest limit and I think about 14-15 psi is allowed for variances on all the cylinders. Having a strong motor is a must if you are doing a build for more hp.

Thanks for the info. I had this already, I was just curious what kind of numbers he had...ops:

[Terrh]

I Agree, Stock turbo's don't perform past .9 bar. Not to say you can't make them spin past that point but the amount of heat generated just defeats what your trying to do.

On another point Water/Methanol is without a doubt a good addition to simulate a higher octane fuel.

if that's the case, why did my car go 12.23 @ 0.9 bar and 11.52 @ ~1.6 bar?

0.7 seconds and probably about 80 horsepower say you're wrong.

[NismoS-tune]

Terrh, are they rebuilt with metal internals or R33/R34 OEMs?

[Eber]

I have seen the dyno graph and i have been there to see the results so yes it did happen, and yes you are wrong to be skepitcle. That information was never meant to leave the dyno anyway because there are better things to come. and it was the cams that made the huge difference paired with meth and tune

[tokes]

Terrh, are they rebuilt with metal internals or R33/R34 OEMs?

They are or were R32 ceramic wheel'ed OEM's. Look at his build thread.

[Terrh]

They are or were R32 ceramic wheel'ed OEM's. Look at his build thread.

Correct. Car (and the turbo, I believe) had 190,000KM on it when it failed.

10,000% sure that it was an OEM ceramic R32 GTR turbo. Nothing special about it. Just a plain old R32 turbo.

[Skym]

You'll see the boost plot on dynograph drop at higher rpm's, boost levels when turbo's run out of puff.

This is a good example, where you can see the boost plot dropping at higher rpm's, boost levels -

http://1.bp.blogspot.com/_vhpEGyEVhes/SNcCmsctQdI/AAAAAAAAA-w/B82_PbEDkhc/s1600-h/ST+R34+boost.jpg

You can extract 430ps out of stock R32GTR turbo's with stock cams, stock intercooler, upgraded fuelsystem, etc. Add cams, intercooler, probably could extract more hp.

Then 455ps out of R34 N1 turbo's (still factory turbo's, as they were sold on the Nur, N1 models) at a lower boost level with stock cams. But can push that out to 550ps with upgraded cams, upgraded intercooler, more boost.

Then 445ps out of R33 N1 turbo's (still factory turbo's, as they were sold on the N1 models) at a lower boost level with stock cams. But can push to 540ps with upgraded cams, upgraded intercooler, more boost.

This is a boost up on R34GTR (stock turbo's) with PowerFC + MAF vs HKS F-con Pro+ MAP -

Power -

http://1.bp.blogspot.com/_vhpEGyEVhes/R6qii4uBDlI/AAAAAAAAAjQ/65Nd6LxVg4E/s1600-h/R34+BOOST+UP+1.jpg

Boost -

http://2.bp.blogspot.com/_vhpEGyEVhes/R6qijIuBDmI/AAAAAAAAAjY/VWi_7REIXKM/s1600-h/r34+BOOST+UP+BOOST.jpg

Note: The MAP setup produces more hp with the same timing, fuel.

To convert kw to hp just x by 1.341.

[maximus140]

Thanx alot for the info guys! Some good numbers. Had a idea, but was curious from other builds what works

cheers!