Boost = pulley size for Procharger P1SC

[07shelbyGT]

Anyone ran a 3.4, 3.2 or 2.9 reichard or regular procharger pulley on a P1SC. I would like to see what boost you were seeing with these pullies.

I use to run a 2.9 on my Mach1 and was seeing 18 with a P1Sc but it seems a bit different on the 05 up.

Let me know Thanks!

 

[yur2slo]

3.85 made 10psi 3.7 made 12 and 3.55 made 14.5. this is all at 6000 rpm. i run a 3.70 and at 6800 i'm at 14-15psi

 

[lostsoul]

3.85 made 10psi 3.7 made 12 and 3.55 made 14.5. this is all at 6000 rpm. i run a 3.70 and at 6800 i'm at 14-15psi

Thats basically what I got. right now though I seem to be 1-2 psi higher for my 3.7 for some reason(17ish). Its hard for me to verify anything with my e-break stuck because of the cold.. haha

I dont know why my boost would read higher.. I know rpms matter and I got 18-19 at 7K which didnt make since.. I have a 9.2:1 cp motor and stock heads.. I dont think either of those matter.. so I dont know why =-/

 

[mustangflanagan]

Damn with a 3.70 i have on my p-1 i make 11 psi and all i have is a 302 shortblock stock everything else oh the compression i have is 9.1:1

 

[lostsoul]

Damn with a 3.70 i have on my p-1 i make 11 psi and all i have is a 302 shortblock stock everything else oh the compression i have is 9.1:1

ahhh.. I got all mess up.. my bad..hummm.. if yur is right then maybe.. I'm running too low of a pulley and 17-19 is what I got =-/...

maybe I should go lower.. but I'm barley breaking 500rwhp now..

or should I leave it on that way I will have 15lbs of boost at a lower rpm?? AHHHHHHH!!!!!

 

[mustangflanagan]

ahhh.. I got all mess up.. My bad..hummm.. If yur is right then maybe.. I'm running too low of a pulley and 17-19 is what i got =-/...

Maybe i should go lower.. But i'm barley breaking 500rwhp now..

Or should i leave it on that way i will have 15lbs of boost at a lower rpm?? Ahhhhhhh!!!!!

mine reached 11 at 6500 rpm

 

[lostsoul]

mine reached 11 at 6500 rpm

I got a little confused.. I'm having the issue with the 3.4 running at 18-19 @ 7K rpm.

but the boost for the 3.7 seems to be different for all of us though.. a few 100rpm shouldn't cause 2-4 psi difference. Hell, I think I was at 11psi when I had the 4.0or 4.10 stock pulley back in 05'

Thats why I was trying to see if there is something in a tune that can cause it, other then rpm and if your 20K feet above sea level.. haha

 

[mustangflanagan]

I wonder if the engine displacement would play a part in it?

 

[Shades]

Doesn't elevation play a part in boost/power as well?

 

[bmaxwell]

And air temp obviously

 

[07shelbyGT]

Thanks all. I wonder why there is such a difference with boost between the 3 valve motor and the 4 valve I had with my 04 mach 1. With a 3.7'' pulley I would barely see 9-10lbs.

Anyone use a 3.2?

I am leaning towards the 3.2 or 3.4 for this motor.

 

[lostsoul]

From what I was told from ATI the 3.4 is the lowest.. if you want more boost then that then you have to use their 10% crank pulley.. Other then that you will have maxed the thing out and time for D1SC

 

[05stroker]

When I had my P1 I was at 12 psi with the 3.7 pulley with a LTs, and an OR xpipe on the stock block.

 

[07shelbyGT]

Thanks gents!

 

[07shelbyGT]

LostSoul, what size belt are you running with the 3.4'' pulley?

 

[ILW84U]

I have a 3.1 pulley on my D1 running 16 lbs of boost. Keep in mind I have P & P heads & longtubes so my boost will show lower.

 

[Marc s]

I have a 3.1 pulley on my D1 running 16 lbs of boost. Keep in mind I have P & P heads & longtubes so my boost will show lower.

Wierd, I have a 4.13" pulley on my D1 and make 15.5 lbs. Stock heads though. 569/489 for power.

 

[19COBRA93]

Everything listed will have an effect on boost level.

There's no right answer. It'll be different on different cars at different altitudes during different times of the year.

 

[DirtyDogOfTheDesert]

From what I was told from ATI the 3.4 is the lowest.. if you want more boost then that then you have to use their 10% crank pulley.. Other then that you will have maxed the thing out and time for D1SC

Wrong again TED.
I ran a 3.1 on my P1, and blower was maxed out at just under 6500 (engine) RPM.

Stock lower is 7.65/3.1 x (step up ratio) 4.1 x RPM = blower RPM

 

[hayabusapowered]

boost is basicly what you couldnt use if you undestand that, that being said your exhaust configuration has a lot to do with boost level, if you have manifolds w/ cats your boost level tends to read higher being as it is a restriction to flow! so that a big reason everybody has diffrent readings with diffrent pulleys . i have a 3.40 and make 14 lbs of boost !