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Which Would You Trust? - Dyno Chart Or Boost Gauge? Bnr34

djvoodoo

By djvoodoo,
in Engines & Forced Induction

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djvoodoo Experienced

djvoodoo

Posted
Posted

Have read many topics on grenading ceramic turbos when pushed above 1 bar etc. Wanting to prolong the life of mine, was curious as to how cautious I should be with my standard boost gauge reading vs dyno reading.

My r34 is running stock boost (without the restrictor)

Dyno chart shows a peak of around 14.5 (1bar) dropping to 13.5 at redline.

But my boost display reads quite high between (1.10 & 1.17 bar or maxing about 16.5-17psi) when i give it a bit of a hit.

Would I be better going with the dyno readings as a safe measurement as I'm sure the boost gauge display is less accurate?

I know the ideal win is going an EBC or boost control kit with the Power FC but want SAU opinions.

post-74132-0-21036200-1385683720_thumb.jpg

GTSBoy Grand Master

GTSBoy

Posted
Posted

Take car to trustworthy performance workshop. Borrow their boost gauge (they'll have one they use to check other boost gauges against). Temp hook up, test drive, answer available in seconds.

In general, do not trust the dash boost gauge on any Nissan. It might be accurate. Or it might not.

Also in general, the boost sensor on a dyno should be accurate. But who knows in this specific instance? So check against a known good gauge.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Boost gauges, especially mechanical ones, are notoriously inaccurate. My first one was out 3 or 4 psi.

Not sure how strong the ceramic wheel on the 34's is specifically, but I ran my stock ceramic Stagea turbo at 20psi for 6 months with no failure. If the bearing is in good condition and the rotating assembly is balanced you should be fine for a while at least. Then Hypergear it. ;)

djvoodoo Experienced

djvoodoo

Posted
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Posted

I'll be saving up for some -7's or -9's after Xmas, so as long as they hold out for a few months it should be fine :cheers:

Will hook it up to another boost gauge and have a run as well, see how much out the gauge is/isn't

levinboy Grand Master

levinboy

Posted
Posted

Mine was running exactly the same on stock turbos (R33gtr) same dyno/tuner, except you made more power :P

Mine ran fine for a year till I hit the exhaust on something and it pulled it back causing the exhaust manifold gasket to leak then when -9s ;)

Also saw your car on the dyno looking good

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XKLABA Grand Master

XKLABA

Posted
Posted

The 34 gauge is pretty good, as said you probably run my boost on the street due to different loading

The 34 turbos are different to the 32/33 one and a bit stronger, I run upto 19psi on my 32 turbos and have done so for 9 or so years, driving style has a lot to do with turbos exploding

On another note I have a APexi Power FC with boost controller for R34 GTR for sale ATM

Rolls Grand Master

Rolls

Posted
Posted

A replacement stock turbo is only $400 ish anyway, I would just leave it and enjoy it as it is, I would trust the workshops gauge if they tune cars all day on it, I've never had a stock gauge that was remotely accurate (though this is in the older R32s and 33s, 34 might be better)

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