boost question

[SLICK4TIME]

I have a 3.5 pulley on my ported and polished charger. Have aftermarket intake and full exhaust minus headers. 1998 gtp

My boost gauge only reads 5 pounds maximum. My question is if that is a normal number for a pulley of that size and charger set up. Thanks

[Fivefingerdeathpunch]

Unplug the BBV solenoid and see what it reads on a WOT run, it will likely spike up much higher.

Stock psi is 6-7 if thats saying anything.

I'd worry about ping/knock without atleast a 3in downpipe on there.

[nos4blood70]

Pulley size is a little small with no exhaust mods. Got an Aeroforce or something similar?

[SLICK4TIME]

Don't see any excessive knock with the tech 2. My gauge is a glowshift if that's what your asking

[sseilmnop]

Ported and polished blower? Is there coating still on the rotors? Who ported it and what it look like? Any pictures?

[SLICK4TIME]

Yes coating is fine. The blower is off of my buddies 02 gtp. I ported it myself. I had the same readings before the new blower

[Scottydoggs]

maybe the bbv solenoid is bad? that lever move on it when you rev the engine in park?

[SLICK4TIME]

When i rev it in park i never reach boost. Only stay in vacuum. Which i figured was normal thinking load is needed

[sseilmnop]

No boost in park or neutral, computer prevents boost.

[SLICK4TIME]

Thats what i figured. Ill have to check the bbv lever when i rev it after work.

[Scottydoggs]

Thats what i figured. Ill have to check the bbv lever when i rev it after work.

it should move.

[Russosaur]

Don't see any excessive knock with the tech 2. My gauge is a glowshift if that's what your asking

So you see some knock? How much? I'm just curious.

[SLICK4TIME]

Little to no knock. The bbv works and i tried running it with the bbs unhooked electrically and unhooked and plugged vacuum line. Did not see any difference

[Scottydoggs]

what do you consider little to no knock? actual numbers are nice.


any pics of this port job? maybe you over did it.

[SLICK4TIME]

A degree or 2 if i remember correctly. Here is a picture of my old housing and the ported one before final finishing. Like i said the numbers are the same as they were before the new charger

[Scottydoggs]

i think you took to much off. but im no pro at porting.

you had the same boost with the 3.5, or did you have the 3.8 before the port job?

[SLICK4TIME]

I had the 3.5 pulley on the old charger yes

[Scottydoggs]

have you sprayed carb cleaner at all the vac lines, the bbv the TB gasket, blower to lim, evap solenoid, map sensor? the t under the blower snout.

spray while the car is idling, if the idle jumps up when sprayed you found a leak area.

[SLICK4TIME]

I recently did all the gaskets on the top of the engine and dont believe to have any vac leaks there. I will double check all my fittings and lines when i can.

[sseilmnop]

A degree or 2 if i remember correctly. Here is a picture of my old housing and the ported one before final finishing. Like i said the numbers are the same as they were before the new charger.

Looks like you removed to much material.