Booster only producing 4lbs of boost???

[Smoked14]

I recently had a P-1SC Procharger installed. After about two or three weeks, i decided to put the boost and fuel pressure gagues on the car. It seems the fuel pressure is about 40 psi when idle, which is stated as being normal. The boost though, i cannot seem to get the gague to show past 4....I realize this could be a lot of things, but if I could get an explinationa s to when 8 lbs is actually delivered it would surely help. For instance, on a 8 lb charger, should 8 lbs be delivered at what rpm or is 8 ever truely delivered...is it like a 56k modem and is basically not attainable>? Anyway, some ideas on where to start would be appriciated, thanks!!!

[Flame Red]

Smoked,

I had a similar experience with my 4 year old procharger, only mine situation was worse. It seems that the week part of the design is belt slipage. I was able to get up to about 4 psi by changing to a Dayco Polycog Belt. It sort of has little teeth in it. I believe the new Goodyear belts are a similar design.

A few people here on the forum have changed the position of the idler pulley in such a way as the belt raps better around the procharger pulley which gives it more grip. Some users found their belt tensioner weak and either replaced it or added a 'helper' spring to increase the tension. I know some people have gone with a smaller pulley, but that can make the slip a little worse actually. I have even heard that someone found a wider belt, and got all the pulleys changed to make it work.

Look carefully at this forum section and you should find some help. The search on this site sucks so that won't help you.

I would not recommend that you go with a smaller size belt, even though if you call ATI, that is what they would recommend. You are asking for failure of some of the other accessories if you do.

Good luck, and let us know what you decide to do.

[Mo_Bandy]

Hi Smoked,

The ATI intercooler has about a 1.5 psi loss , depending on how accurate your guage is, theorectically you may only show 4 pounds, the intercooler increases the air density so the 4 your seeing is going to actually be an improvement on 6 non intercooled... I'm running 8 pound sthrough my vortech into probably tthe same intercooler that you have. I'm seeing about 6.5 maximum and that is right at redline... depending on the efficiency of your s/c, you should be able to attain full boost by at least 4000 probably less.

as a side note before even with 8 pounds non intercooled I was seeing over 200 degrees intake air temperatures, now intercooled at 6.5 I rarely see anything over 130 unless the car has set and heats up from heatsoak..

Mo