I took almost a year off from this forum and just left my car in the shop when I went back to school.

I just got the car dynoed and it pulled 307whp.(don't have the dyno sheet yet) What I am a bit confused about is the boost dropping across the power band from 8psi to 3psi (at redline).

I was expecting the boost to remain flat or taper off slightly at high rpms, but not to tank. What boost dynamics is everyone else seeing?

How was scalbert making 369whp with the same setup? does anyone have high boost setups so I can get a feel for the expected whp?

I have the HBP, the 3.5" max boost pulley, hope intercooler & AEM FIC.

 

Maybe a loose belt... nice to see you've come along way since you first started modding.

 

I got dyno'd about a week ago and put down 290 whp untuned with no imrc. My boost peaks at about 5.6-5.8psi. Graph is in the car, I can get it later tonight.

I have the hbp and the stock shaft pulley. I have a 3.3" shaft pulley but haven't put it on yet.

 

Your belt must be slipping. Thats the problem with these 4rib bolts.

 

I noticed that with my 3 lb boost pulley that came with the car, I was hitting the 3 lb boost point on my boost gauge in WOT. Now that I have the 6 lb boost pulley from pulley boys, I noticed that the boost guage reads 5 lbs of boost max very rarely, most of the time it coasts around 3 lbs sometimes down to 1 lb of boost in WOT. I used to have a LOUD silipping and squealingbelt, but since I tightened the tensioner, it seemed to go away. Maybe I am still slipping, but I know my car is supposed to feel faster. It feels like 10% more than the 3 lbs of boost I used to run.

 

It could be belt slippage but I dont think it's supposed to peak and hold at the max psi. Mine peaks at almost 6 for a couple seconds then tapers down to 3ish or so towards redline.

 

Just checked the dyno and it doesn't have boost on there, only AF, hp and tq. I forgot to get a printout of the boost.

Did you have any trouble getting the FIC working?

 

It's normal SC'd apps

 

it depends on your exhaust setup. get a freer flowing system and watch the boost go up

 

What's the point of the intercooler if your supercharged?

 

Same thing it does on a turbo car, cool the intake charge (lowers intake temperatures on the air entering the intake manifold)

 

wtf only 5psi?

I hit 5psi on the stock ct setup and pulley and now that I have the ct alternator hbp I use to hit 8psi when I was auto now 7-7.5 as a manual.

Something is wrong.

 

Actually took a look at it this morning, and it doesn't even reach 5 lbs, it's a hair under at peak. then again, I got the blower pulley that is 3.4" diameter. I thinbk I'm gonna need to do 3 things:

1.) get the true HBP from comptech that adjusts the alternator pulley size and put my original blower pulley back on.

2.) get a 2.5" inner diameter exhaust piping all the way through.

3.) Get the P2R throttle body that let's more air in.

 

I'm thinking to get the full effect of the new blower pulley, you may, in fact, need the Alt. HBP to see it register on the boost gauge

As far as seeing lower boost numbers climb while boosting; If you check out RonJonTL757's video on the thread below (last page) you can see how his boost looks like it is right at 4-4.5 (at WOT) and then climbs slowly to 5+ as he accelerates before shifting. You, rondog, should see more boost, with the alt. HBP, I believe.

https://acurazine.com/forums/showthr...760273&page=14

 

Had some minor issue with the bypass leaking. Holds boost now. 8 tapers off to 6. Pulls 350 hp. yay

 

Sounds more like a boost leak than pulley

 

In SC'd apps, larger exhaust diameter effectively lowers your boost, but provides HP gains.

This thread is LOL. Unless all you SC'd guys are running the EXACT same pulley/exhaust/displacement/inter/aftercooling you won't be running the same am't of boost. SC's lose efficiency as the RPM range increases, which is why you see the boost spike, then decline and slowly raise again.

This is why turbo > SC.

 

Ron, the answer to your boost psi questions can be found on the first post of Scalbert's thread below.

https://acurazine.com/forums/2g-cl-2001-2003-50/sc-pulley-sizes-456923/

Good luck!

 

x2

 

yah, we need that backpressure w/ a roots blower.

 

I agree, but boost taper is no stranger to turbocharged applications as well.