I'm making only ~13 - 14 psi of boost at WOT witha 2.9 pully I thought I should be making at least 15 closer to 16

 

Boost is only a measurement of restriction. More boost doesn't always mean more power. You are right around where you should be with a 2.9"

 

I am on 2.9 and I am only seeing 13-14 top. I never seen my car go 15-16 if I want to go 15-16 then I would had 2.8 pulley.

 

My opinions 2.9 is good enough and will be switching 42lbs to 50lbs will be better.

 

might see 15+ with cold weather but probably not anymore.

 

I see 14-15 psi peak on my 2.9.

 

as said before, more boost does not mean more power, when creating more boost, its making the s/c work harder to force more air in since there is a greater preasure pushing back. im on a 2.7 and see 16 psi. i just love the torque

 

13-14 sounds right for a 2.9

im on 2.8 60s seeing 15-15.5lbs and around 16lbs in the crisp cold time

 

On the street I only see up to about 14 psi boost, on the dyno I get 16, and on the track I boost to 18.
I have a 2.85"

Maybe theres something in the tune thats lmiting your boost though?

 

Your boost equations make no sense

 

Thats because they are not equasions.....

On the street Im more limited to how much I feel comforatable opening up my car.
By the time I top out 2nd gear, I'm @ 70mph.... SO I max out boost at like
14 maybe 15psi by then.

On the track, being a safer enviroment to accelerate your car, I dont have to watch for animals cops other traffic, I set up my interceptor to record boost, and I finished at the top of 3rd gear, at 100mph... 100mph has more drag then at 70mph and because of the diffrent gear ration between 2nd and 3rd, the engine had to work harder at 6000 - 7000 rpm in 3rd then it did in 2nd, thus more restruction on the engine and I peaked at 18 psi boost..


On the dyno, there is no aerodynamic drag, and itwas done in 4th gear, I maxed out boost at 16psi.

BTW: Before I installed my header Dyno Boost = 17, WHP = 232, after Dyno Boost = 16 and WHP = 239

More boost does not always mean more power, however when an engine is being compared to itself at the same RPM, then boost CAN be used to gauge power.

 

Im pretty sure our cars boost the same psi reguardless of dyno/track/street.

 

They sure do. I make 19psi with my 2.6" and can hit it in any gear regardless of where I am.

 

They sure do. I make 19psi with my 2.6" and can hit it in any gear street, dyno or track.

 

I have the promblem. My 2.9 was only making 10

 

What were you making on your stock pulley?

 

I was never on the stock pulley,I went straight to the 2.9

 

Ahhhh you're an ls. I never saw that the first time. Bypass valve isn't working properly?

 

It was brand new from zzp

 

what are your mods?

what type of tune do u have?

 

The tune doesnt control boost levels on a sc so thats out.I was on stock header and dp with a 2.5 catback.My guess it would be the dp since its very restrictive

 

Trifecta tune

Injen intake, Vibrant header / DP and GMPP exhaust 50# and 2.9

 

hmm that does seem low.. im at about 16-17psi on a 2.8 - 3" intake, full exhaust, and full cooling mods with custom tune.

 

the tune can control boost, by limiting it. my 1st gear is set at 10lbs and 2-5 is 15-16lbs

but @ZeroSk8ter83 the stock header/dp is what is restricting ya so you right big guy

 

If the stock header/dp was restricting flow you would see higher boost numbers not lower.