Factory boost guage aint wking

[666 R32]

Hi all,
My factory boost guage stopped working one day, it worked when I got the car but isn't now. It hasn't been working for a while & was just wonderin if theres any easy/obvious things I cld check to c if it's the cause?
cheers

[GSr32]

In the engine bay, there is a small black box attached to the firewall (drivers side), it's the boost gauge sender unit thingy. It will have a small rubber hose connected to it, which should go to the plenum chamber. Check that it is connected at both ends and has not been split or have a leak or blocked.

[666 R32]

Thanx 4 tht, it was just the hose had come off the plenum
however the guage is spose to read -7 when idling isn't it? mine is just under the 1/2 way mark between -7 & 0, it also goes up to 3/4 the way between 0 & 7 at full boost (factory) which would b just under 1/2 way if the guage started off @ -7. I guess there probably isn't any easy way to fix this, but if there is it wld b much appreciated.
cheers

[gelpke]

i have the same problem with mine, i read somewhere that the factory boost gauges just aren't that great. i'll be getting an aftermarket one to check the factorys.

[gtr33m]

The factory boost gauge on all Skylines even up to the 34 are crap. They are actually a fairly accurate digital gauge, but the proble is there are no accurate markings on the gauge and no one understands mm of Mercury anyway.

I'd tap in a new boost gauge, even a good mechanical one will do. Pricol make a cheap but reliable gauge for about $50 AU.

FYI, +7mm works out to be around 14psi.

[SlowGts-t]

If your read the gauge carefully, its +700mm not 7mm and that works out to 0.9332566 bar or 13.53574 psi.

Just being pedantic

[gtr33m]

All right! I concede. But if you can read those gauges to within half a psi, or to within 5 psi for that matter, you've got better eyes than I!

[SlowGts-t]

hee hee.. no, I cant either. All me knows is that if it is above the top mark then its too much boost (for now) and if its below its too little boost

[RazorGTR]

So my GTR is boosting to just over the half way mark on the plus side. Not much boost but still goes alright haha.

[gtr33m]

I'd say that you still have the boost restrictor in place, which restricts the RB26 to about 9 or 10 psi. Send me an email and I'll tell you how to get rid of it.

Without it you get about 14-15 psi.

[Whitebread]

The gague works the same way as a brometer. 760MM of mercury is equal to atmospheric preasure at see level or about 14.7 pounds per square inch.