Dyno Results

[MazdaTGTS]

What does your boost drop to at redline?

Nothing, the boost stays there all the way. I think is because the boost controller that I have (Profec B). For me the best boost controller for our cars.

[Lex]

Nothing, the boost stays there all the way. I think is because the boost controller that I have (Profec B). For me the best boost controller for our cars.

I must be doing something wrong .... Mine drops to 12 psi by redline and I dont know why.

Maybe it's a leak, maybe it's the stock EGT exhaust maybe it's the ebay boost controller.

It's bothering me.

[EscortNation]

I must be doing something wrong .... Mine drops to 12 psi by redline and I dont know why.

Maybe it's a leak, maybe it's the stock EGT exhaust maybe it's the ebay boost controller.

It's bothering me.

Its just the vj-20 running out of breath

[Lex]

people hold 15 psi to redline though ... I talked to some local turbo techs and they believe it's the exhaust that is too restrictive

[EscortNation]

people hold 15 psi to redline though ... I talked to some local turbo techs and they believe it's the exhaust that is too restrictive

I have 2.5" exhaust with no cat or resignator. also 2.5" intercooler piping. Still drops off at redline

[D323]

I have 2.5" exhaust with no cat or resignator. also 2.5" intercooler piping. Still drops off at redline

Thats exactly what I plan to run.

[Lex]

I have 2.5" exhaust with no cat or resignator. also 2.5" intercooler piping. Still drops off at redline

What about the downpipe... is it stock?

What does it drop down to?

[MazdaTGTS]

I must be doing something wrong .... Mine drops to 12 psi by redline and I dont know why.

Maybe it's a leak, maybe it's the stock EGT exhaust maybe it's the ebay boost controller.

It's bothering me.

I never have that problem even with out the Profec B. Overboosting well that is another history. BTW I have a 3 inch exhaust.

[Lex]

I never have that problem even with out the Profec B. Overboosting well that is another history. BTW I have a 3 inch exhaust.

Do you have 3 inch exhaust from the turob back ... or do you have the stock downpipe?

[redfox]

I have 2.5" exhaust with no cat or resignator. also 2.5" intercooler piping. Still drops off at redline

i have the same setup....2.5" intake and exhaust (turbo back) and a FMIC and HKS SSQV, with the stock wastegate and no boost controller....

i hit 10psi by 3500ish and at about 5k if i hit WOT i will hit 15psi and stay there till redline....i have done this on 2 vj20 turbos now so i know that the turbo does NOT "run out of breath" as some people seem to think it does....

the boost gauge in my sig is a real shot of mine...

[EscortNation]

What about the downpipe... is it stock?

What does it drop down to?

Its also 2.5"
Holds at 10-11 till about 5.5-6k then starts to drop till redline droping to about 8psi.

[MazdaTGTS]

Do you have 3 inch exhaust from the turob back ... or do you have the stock downpipe?

Stock downpipe. After that 3 inch.

[MazdaTGTS]

i hit 10psi by 3500ish and at about 5k if i hit WOT i will hit 15psi and stay there till redline....i have done this on 2 vj20 turbos now so i know that the turbo does NOT "run out of breath" as some people seem to think it does....

But the turbo efficiency drops after 15 psi or maybe less. That's why I don’t push the VJ-20 beyond that.

[Lex]

But the turbo efficiency drops after 15 psi or maybe less. That's why I don’t push the VJ-20 beyond that.

What BOV do you run in your setup? Perhaps mine is leaking - I have the stock GTX one.

[323GT-R]

The best GTX I have seen on a dyno was running 12psi. 230HP on a conservative dyno, and a flat 230lb/ft of torque from below 3000 to over 5000 rpm. With a decent tune, 12psi is all you need, any more just kills the turbo quicker.

I don't understand the obsession with trying to run small turbos at higher and higher levels of boost???? If you want to run a lot of boost, get something like a big T3/4 hybrid, those things thrive on boost...