Stock R34 Gtr Turbo's Boost Limit?

[M34N-R]

Hey guys,

Pretty much as the title goes, I got my car back from a service and some upgrades, one a boost controller. The 1st setting for the boost controller is 19PSI! Second 15.5PSI and Third 16.7PSI.

On return home from the tuners I put the foot down once and it was a dramatic increase from the 14psi it was on originally. Saw the settings and just cruised home not wanting to do any damage!

I've done some searching but haven't found anything on upper boost limits of the stock turbo's. People are how ever running in between 14 and 16 PSI, I've just been running it on 15.5psi as I don't want to do any damage. But I'm still hesitant to open it up.

Are the settings safe? Any info would be great! Cheers in advance!

PS, not sure if it matters but did say they set it up on the dyno?! No graph or anything though??

[SiR_RB]

Still been a ceramic exhaust wheel, wouldn't realy go past 14psi

Definetly 19psi is too much !!!

[nomnomv8]

As stated above 19 psi is asking for the stockers to go fail.

In my experience ive seen stockers run on 16.5psi (1.15bar) for substancial periods of time (~2 years) and still going strong. Personally id set .8bar (11.5psi) for putting around town and cruising and set 1.15 for when you want to have abit of fun. Keep in mind though the consequences of your actions if the stockers go bang though

[GTSBoy]

Yuh. Ceramic bang on RB26 often leads to engine death. To be avoided at all costs unless filthy rich.

[Moodles2]

Generally 14psi (14.5psi exactly with the restrictor removed) is the "tried & tested" method for old R32/R33 ceramics, heat (high boost, retarded timing etc) and detonation (lean mixture, Bee*R limiters etc) is what most contributes to ceramic wheel failure. A person has reported one of their wheels dislodging at 2psi cruising down the highway, though it was a R32 from memory, so it can happen anytime at any boost pressure. Since the R34 turbos are still newish and ball bearing it's very unlikely this won't happen for at least afew years, I don't think anyone has reported a turbo ceramic wheel failure with R34 turbos yet.

[Eps]

I hear the ceramics are much more sensitive to heat and the main cause of failure in them.

Edited December 4, 2012 by Eps

[(OO)SKYLINE(OO)]

Run 1 Bar = 14.5 PSI, would be the max on OEM R34 GTR turbos.

And get a tune done, just to be safe.

[GTR-34A]

I recently had mine tuned with a new haltech ecu, cam gears and boost controller, tuners set high boost to about 15psi which they believed to be safe, i have heard people running much more (18psi etc) but i wouldnt bet on it lasting in the long run.

[BrynDETT]

was drunken googling and found this thread, thought id post my results (so far)..

ran 16psi for a year and a half... car was trashed constantly.

now running 18psi.. so far so good... only made another 20hp with the extra 2 psi though

[XKLABA]

I run 15-16psi day in day out and 19 psi for drags and dyno runs, have done so for the better part of ten years in my 32, I replaced the first pair dew to the bearings wearing out and the second are still going

the 34 turbos are a better/stronger design and are BB ( less resistence to turn comp wheel ), how you drive them is the most important thing IMO, sit there doing burnouts/donuts or trackdays on full/big boost and there won't live long

be weary of how hard there are working and keep it to a minimum and they should live a long life

GTR-34A, I love the the colour of your VS-II

[infamous_t]

Been running 1.1 bar with my R34 GTR turbos for the last 18 months, so far so good.

Playing with adjustable cams (standard cams) definitely woke the turbos up in the low down and mid range.

1.15 bar seems to be the consensus on the limit if you want the turbos to stay alive for an extended period of time.