Yellow_09_SS

Hi guys,

I can't get the car to over 4 psi in first gear only. Any ideas of the cause?

no_ss

iTrader: (2)

Tune has reduced boost in first to keep from blowing the tires off your car.

ECaulk

iTrader: (6)

Where in CO are you?

You shouldn't be reduced to 4psi, that's overkill.

Aroooo

mine actually does this too. I get about 7psi tops out of first Gear.. I used to get full boost in my trifecta tune

63 Nova SS

iTrader: (3)

Should be 15

califcarm

When I was gms1 (how I purchased the car) I would get about 8psi max in first gear most of the time. (few hundred feet above sea level).

Not sure but I would think in CO the PCM would increase gauge boost to compensate for any increased altitude you might be at. So being less would not be attributed to any altitude difference for you. (since the PCM is trying to hit a target air load it would increase boost at higher altitudes would be my guess).

Sounds like something is a bit off but I don't have the experience to say what it might be.

tomj77

iTrader: (2)

First gear should be 8-10 psi. Something off there

HHRFrenchy

I think I get 5, but haven't driven it in about 2 months. GMS1.

tomj77

iTrader: (2)

It also depends on ur elevation I suppose. If the car has a tune on it someone could have lowered or raised first gear boost

Aroooo

on my old engine I would hit full boost all day any gear. since I've replaced the engine, i have had all sorts of boost issues. first being a 8psi max, then boost dumping at 5500ish rpm while still Wot. boost spiking from 5-11 psi, up and down constantly while. doing a pill. after lots of messing around I bypassed my bpv solenoid and instantly hit full boost in 2nd - 5th basically every run.

tomj77

iTrader: (2)

Ya that solinoid can cause weird boost problems. Did u check ur boost in first all the way to redline?