R34 Gtt Boost Gauge

[nuffsaid]

Hi all

1) Who here has an aftermarket boost gauge in their R34 GTT?

2) Is it electrical or mechanical?

3) I was just wondering how accurate the factory boost gauge is in comparison.

Thanks

Edited August 16, 2006 by nuffsaid

[666DAN]

My one is dead-on, but I've seen others which are extremely poor in comparison.

[nuffsaid]

Darn it aye, was hoping I wouldnt need to get a boost gauge

I thought they were either all inaccurate past the standard boost levels, or they were pretty much spot on.

I believe they are electrical gauges. Alot of the top brands sell electrical ones too, does this mean that they are also relateively inaccurate? Perhaps the boost sensor on the R34's isnt as good quality.

[xRHETTx]

There is no real reason why the stock boost guages would be highly innaccurate, unless the sender has failed?

IMHO usually people go for aftermarket boost guages (and oil pressure and water temp) as they have more increments and are easier to read. With only 4 increments or so on the stock one its quite hard to read accurately. The difference between 12psi and 14psi is hard to judge for example, and one is safe and the other is possibly not.

[SS8_Gohan]

my guage reads a touch over the 3/4 on full boost.... and if they run 7psi stock (which mine is) - does this mean that the guage is innacurate?

[kralster]

Well they work off kilograms/cm*2 or something of the top of my head (i haveb't driven mine for 2 weeks) so it sounds about right. Mine sits on just over 3 quarters as well on full boost.

[nuffsaid]

I have a full exhaust and on a cold night it hits the last marker (at 1)

Note: I have not upped the boost.

[SS8_Gohan]

^ i guess that sounds right too, except for the fact that i thought the top of the guage was 1 bar, ie 14psi? and from what i've read, 14psi on a stock 34 turbo is a recipe for disaster...

[nuffsaid]

Thats right, thats why I wanted to know whether the guage was off

The only power mods I have are air filter and full exhaust. Nothing else. No way I can be reaching 14psi.

[Links]

Top of the gauge is 13.7PSI.. it's in x100mmHg..

so > 3/4 is about 9/10PSI

[SS8_Gohan]

in another words, not accurate... as my car is as stock as a rock in terms of performance mods

[R34GT-t_07]

Same here on cold nights my is going nearly over the 1 mark nd all i have is catback and pod so i guess it inaccurate

[32GTRB]

ive got autometer cobalts on mine (boost/vac on an xr6 turbo). my gauge is pretty accurate when there is constant acceleration (auto, gauge is mechanical), however when i floor it and it kicks down a gear, it spikes up to 10psi, and then returns to 6psi.

my gauge also lags abit because i have kinks in the nylon tubing, which i will be replacing soon.

[benl1981]

Its good to have a nother gauge but not really needed.

In my R33 I occassionally use an old pressure gauge I have that is fairly accurate to check the boost and see where it sits on the factory gauge.

I dont leave this connected and just have a glance at the stock gauge to see eveything is ok.

Stock gauges (iff same as R33) are a pressure transducer that sends a 0-4.5v (I think) signal to the dash.

I took a multimeter to it once but can't remmber the vs at atmospheric pressure (May have been 1.25 or 2.25v)

So it would be a 2bar MAP sensor...

0-1bar is vacuum

1-2 bar boost - due to turbo

+1 on the gauge would be about 14psi-15psi

[walkoau]

i got a speco gauge to replace my factory boost gauge and the factory one was spoy on.

[xRHETTx]

Yeah Ive got a pivot stepping motor boost guage on my r32, it seems the stock one is pretty close.

With just a cat back and filter its running 0.7-0.75bar which is 10-11psi i guess.

The conversion from 100mmHg (what the factory guage is in) to psi is times by 1.934. So +7 on the factory guage is 13.5psi.

[nuffsaid]

Mine is at 13psi with just gull zorst and pod!

Strange, maybe I do need another gauge.

[32GTRB]

so the factory gauges are in a different unit? i always thought they were in psi. what stock boost levels do they run? one of the tuning guides said not to run the stock turbo past 10psi. but some of you guys are way past that? :S