VS-VY Stock L67 PSI

[ben315vz]

Hey guys,

Just wondering if anyone knows how much PSI a stock L67 Supercharged V6 runs? I just installed a boost gauge in my VS (with the reconditioned VY L67), I have only road tested it once since I have installed the gauge, and it was running around 4-5 PSI, does that sound about right?

After a while I am thinking of buying the Yella Terra Stealth intercooler kit for the L67 and running between 12-14 PSI, but even the 10 PSI kit would probably be enough.

Thanks.

 

[pjdm1980]

They were 6PSI from the factory.

 

[Haydz]

hey man i can recommend a2a instead of w2a check out l67torque.com for more info on the performance side of this engine. but yes that sounds about right for boost pressure. under wot in the right conditions should see 5-6 psi on the gauge

 

[SweetWagon]

Do you have the standard exhaust still on it, or any other modifications?

if its all still factory then as stated, you will see ~6psi in the right conditions.

commonly though, improvements to head flow, cam and exhaust etc will see a reduction in manifold pressure.

 

[ben315vz]

Ok, when I take it out on the weekend again, ill see what it reads, I only drove up the road and back which is about 2 kms total.

hey man i can recommend a2a instead of w2a check out l67torque.com for more info on the performance side of this engine. but yes that sounds about right for boost pressure. under wot in the right conditions should see 5-6 psi on the gauge

Thanks mate, ill check that out. I'm not too sure on what intercooler set up to use so its good to find out what the best one would be. I'll go take a look at l67torque.com and see what info I can get from there.

 

[ben315vz]

Do you have the standard exhaust still on it, or any other modifications?

if its all still factory then as stated, you will see ~6psi in the right conditions.

commonly though, improvements to head flow, cam and exhaust etc will see a reduction in manifold pressure.

I still have the same exhaust system as I have on the N/A V6, Pacemaker extractors, standard car, 2.5 inch redback exhaust and a redback sports muffler in the middle. Should I change the cat (or any other part of the exhaust) now because its supercharged? It also has the factory L67 cold air intake, K&N pannel filter, etc.

I actually have a question about the diff though, if I was to get an LSD or get mine rebuilt as an LSD, what ratio/gears should I get? 3:08.1, or because it's LSD is it different to the standard diff?

 

[SweetWagon]

I still have the same exhaust system as I have on the N/A V6, Pacemaker extractors, standard car, 2.5 inch redback exhaust and a redback sports muffler in the middle. Should I change the cat (or any other part of the exhaust) now because its supercharged? It also has the factory L67 cold air intake, K&N pannel filter, etc.

I actually have a question about the diff though, if I was to get an LSD or get mine rebuilt as an LSD, what ratio/gears should I get? 3:08.1, or because it's LSD is it different to the standard diff?

The extractors and 2.5" system could easily account for the lower manifold pres. as gases are being expelled easier. with upgrading it, depends how wild you plan on going with the motor - if your cranking up the boost, intercooling, cam etc, then you will want it to breath much better.

Most ditch the single cat and go twin cats. From there you could keep it twin 2 1/4" the whole way or merge into single 3"

3.08 really isnt a bad ratio, with the extra torque they pull really well with the stock ratio and sit nice on the motorway, but if you are set on replacing the diff gears and have an auto, i would skip 3.45 and go to 3.7

 

[pjdm1980]

I had 3.9's in my Statesman and it launched Like a rocket but sat at 2200RPM@100Kph.

 

[wamboin23]

I've just gone twin 2.5" exhaust, merged to single 3" before the diff. Nice and quiet at cruise (even at 2600rpm with the 3.9's), but sounds good under throttle.

Just for comparison, mine with 87mm pulley ("10psi") sits at about 8, but i haven't had a boost gauge on for ages, so would be lower now I'd assume.

 

[GenFree]

Delete the boost solenoid,the mod is written up on l67 torque

This will stop any electronical interearance with boost if its not operationg correctly.