supna

Anyone know which line is best to attach a boost guage to on a 94 Legacy GT Twin Turbo?

Ta

richrussell

Have I just replied to you on the Yahoo group?

Anyway - on top of the inlet manifold, just behind the alternator there are three small rubber pipes from the metal pipes running to the solenoid box. The middle one has a one-way valve, so use either the left or right hand one.

Cut the pipe, insert T-piece, and run pipe from there through the bulkhead to your gauge.

Rich

supna

Yeah you did rich, I did reply with thanks. Is it pipe 12 which has the one way valve because I've changed the pipes and did not know that, that one had a valve inside. What are the implications if the valve is not there or working?

David

Normac

Supna

I have the same 95 legacy twin turbo, does yours have a marked power decrease after the first turbo and then come back on full boost at about 4500 -5000 rpm or is it smooth all the way up.

Once you have fitted your gauge if you could let me know what pressures you are getting many thanks
Byron

Normac

Supna

I have the same 95 legacy twin turbo, does yours have a marked power decrease after the first turbo and then come back on full boost at about 4500 -5000 rpm or is it smooth all the way up.

Once you have fitted your gauge if you could let me know what pressures you are getting many thanks
Byron

richrussell

I was getting about 12/13psi on the first turbo, then dropping to zero in the VOD, then flying back up to 13psi on the 2nd.

This is on my 1996 BG5B GTB, in 2nd and 3rd gear.

Could read the gauge too well, given the fact that I prefer to look where I'm going when on full boost, and that the gauge was balanced in the little box with the popup lid behind the gear lever (you know what I mean).

Taken the gauge off now, as I needed it back in my other car (where I borrowed it from).

Rich.

Normac

Thanks Rich thought i had some sort of timming problem between the two turbos cauld not believe my boost dropping to zero before firing up again makes for kak dragging as just as you are clapping the guy next to you you loose power for a bit and he is off again. will have to buy a Sti or something hey

cheers for now

supna

Got the guage installed and the car is running full boost at 1 bar (15psi), is this normal I have still got the cats in but the exhaust is not stock and also have an induction filter fitted.

Normac

My one seems to run standard at 0,5 bar and then with HKS EVC full it gets up to about 1,1 bar... Also running standard front plus cat and Nur spec rear

richrussell

Normac - welcome to the world of the twin turbo 'valley of death'

You can drive round it you know, so it's virtually non-existant. Rather than just flooring the throttle, try feeding the power in progessively, aiming to have it full throttle around 3000rpm. Then the valley is hardly noticeable.

Also, change up at 6500-7000rpm, quickly, so that the 2nd turbo stays on the whole time, don't let it drop below 4000rpm, or you'll have to climb through the valley again.

Remember the GT-B is a touring estate car, not a drag car! According to Subaru it's been the holder of the FIA fastest production estate car in the world - 169.9mph as standard (speed limiter removed obviously!).

Rich.

supna

Should I be worried if stock is only 0.5bar and I'm running 1.0bar with no fueling computers or anything. What sort of things cause overboost?

Normac

Rich u have had me laughing for 5 min s now with that VOD statement I was still trying to work out what it stood for

Good one