Boost gauge can't be right...

[JerzNick]

Sup all, Here is a pic of my gauge at idle showing 16psi VAC... At WOT it goes to +4... is that all the boost I'm getting?

I have the gauge T'd in between the map and lim, No vac leaks that I can tell, fuel trims are just about perfect.

Any ideas?





Also, Im running a 3.0 pulley with out an IC, just ported heads, headers and xp cam. Should I go up in pulley size to be safe?

Thanks

 

[darkhorizon]

Sounds about right assuming your bbv is broken.

 

[JerzNick]

BBV is fine, the BBS is shot... Unplugged it and now seeing 12lbs

Thanks

 

[dbextreme]

Vacuum is right. I stay right around 14 (whatever units) at idle and I have a similar setup as you, just top swapped with a 3.4. I see 9psi at WOT

 

[JerzNick]

Vacuum is right. I stay right around 14 (whatever units) at idle and I have a similar setup as you, just top swapped with a 3.4. I see 9psi at WOT

Just out of curiosity, what made you choose a 3.4?

 

[darkhorizon]

Just out of curiosity, what made you choose a 3.4?

high compression lower end and pump gas I assume.

 

[BillBoost37]

Since you don't have a BBV or BBS.. you know.. lol

BCA and BCS if you are interested.

 

[dbextreme]

Just out of curiosity, what made you choose a 3.4?

What dark said... And it's a common size to start with from what I read. Right now I am seeing 0 KR so I will venture into dropping pulleys eventually. I really want to go Intercooled, but am happy with the setup at the moment.

 

[JerzNick]

Since you don't have a BBV or BBS.. you know.. lol

BCA and BCS if you are interested.

I have the BBV. Just the solenoid is unplugged. Is that bad long term?

What's bca/bcs?

 

[JerzNick]

What dark said... And it's a common size to start with from what I read. Right now I am seeing 0 KR so I will venture into dropping pulleys eventually. I really want to go Intercooled, but am happy with the setup at the moment.

I'm seeing some small kr in high rpm... I tried to back off the timing but it's not helping. Looks like I'll be going up to 3.4 just to be safe.

 

[BillBoost37]

I have the BBV. Just the solenoid is unplugged. Is that bad long term?

What's bca/bcs?

Check with GM.. you don't have a BBV, because you don't have a turbo. BCA Boost control actuator. BCS boost control soleniod.

 

[darkhorizon]

The solenoid never does anything on a stock car, so having it unplugged is no different than having it plugged in.

 

[dbextreme]

Once I get a few more miles on the car (and while I collect pulleys from 3.0 - 3.3) then I'll drop sizes to find one the motor likes.

AS for the BBV solenoid, I removed mine completely. I capped off the piece that branched off the FPR and I left a 2-3" pig tail of vacuum line off the back of the BBV just open to atmosphere. Works great so far.