04 comp g, 5 psi boost wtf?

**Ace** · 04-11-2011

I installed a boost gauge today, it shows 20" vacuum at idle, but it only shows 5 psi at WOT. The factory boost bar graph goes all the way up though. How much boost are these cars suppose to have? I really hope its more than a lousy 5 psi lolz. BTW my car is bone stock.

**TheOtherNick** · 04-11-2011

they range form 5-8 stock depending on engine condition.

**Bio248** · 04-11-2011

knowing how you think, just by that post, you dont need any more than 5 pounds of boost.

**redlinepontiac** · 04-11-2011

hm he needs the eaton boost controller zzpoop sells

**Ace** · 04-11-2011

And you would know this how? By reading 5 sentences, wow you're an idiot. FYI im an ASE certified Master Technician with lots of experience, I know

im doing Bio248. Anyway I'm a newb to this whole Grand prix world, i do not know the stock boost pressure therefore i was asking. Thank you to those that actually have a useful answer.

**csssaint12** · 04-11-2011

^ this made me lol. You say you know what you are doing but you are a newb to the grand prix world.....

**01gpgt01** · 04-11-2011

well then you would know that boost is a measurement of restriction. Less boost=better flow.

**mechguy** · 04-11-2011

I'm going to tell you your gauge is wrong and you have 50PSI. The car is no faster or slower now, but are you happy now?

**taman86** · 04-11-2011

LMAO

**Ace** · 04-11-2011

Seems like im stepping on some toes in here. I dont care whether i make 5 psi or 50, i just wanted to know what is normal for these cars. 5 psi seems like a pretty low number to me. Most supercharged cars tend to have around 8 psi. Sure less boost=better flow but if your boost is supposed to be a certain amount and is not reaching that amount, does that mean your engine magically became more efficient?

**Fivefingerdeathpunch** · 04-11-2011

what line did you tap into to?

**Ace** · 04-11-2011

I t'd into the line that goes to the map sensor

**footballplaya3k** · 04-11-2011

Another noob being torn apart....

I'd expect it to be more like 8 with the Gen V.

**blueguy** · 04-11-2011

Then you "T"d it into the the correct line. What supercharged cars have you been around that make a happy median at 8psi?

All of these cars tend to be a little different...like stated...most of them range anywhere from 5-7psi bone stock...your factory boost gauge is worthless...and your real gauge is accurate. If you installed headers I'm sure it would possibly even drop. That is why people toss on smaller supercharger pulleys after flow mods...to get the boost back they "lost" due to a freer flowing motor.

**Ace** · 04-12-2011

89 thunderbird sc's make 10+ psi stock
03-04 cobra's have 8 psi stock
Cadillac XLR's run up to 12 psi stock

Cool, i guess im in the normal range, recently got this car, its got 84k seems well maintained,pretty cool daily driver, to me at least. Not trying to race it, i've got a 98 vette for that

thanks to all that have positively helped.

**mechguy** · 04-12-2011

Psychrometrics play the largest role in deviating compared boost pressure between stock cars.

**Kejross** · 04-12-2011

my l32 with headers, 1.9 rockers, and a 3.6 pulley only pushes bout 8psi in this warmer weather...

**Bio248** · 04-12-2011

was it hot out that day?

wait until you get it out on a cold night and you'll add 50% more boost on top of that as well as more timing.

**t24moore** · 04-12-2011

Tearing a noob apart? Since when did this forum stop being soft? You guys giving him a hard time are retarded. He asked a legit question. Ace a lot of these guys are here because the real grand prix forum was too "rough" for them. I find it hillarious that they are trying to talk **** to anyone here.