This is just for some personal info.

Why is it that centri blowers do not make as much torque as twin screw or roots?

Also, I've noticed by looking at many people's sig and such, that it seems to be a trend that Procharger puts out less torque than a vortech or paxton when all three would be putting out the same HP.
Just an example, not real numbers: Vortech/Paxton: 400RWHP 375RWTQ
Procharger: 400RWHP 355RWTQ

 

i dont fall in that category. neither does my friend that has a stage 2 P1SC he has 360 hp and 377 tq. down low my car is stock at 4200 rpms 380 torque and keeps climbing to redline.

 

you said down low yours is stock, when do you start to see boost?

 

You see boost the whole way, but it increases linearly as RPM's rise

at 2000 RPM it feels like it has all of the bolt ons plus a bit extra.

I still have plenty of power to light up the tires with the centri blower.

I cross over 300 ft-lbs at the wheels at 3400 rpm and max out at 355 ft-lb at 5000 rpm. This is on a mustang dyno as well so the numbers come out lower then they would read on a dynojet.

 

I read somewhere that it doesnt kick in until 2800 and for novi's it's much later. This was why I decided on the vortech or procharger for street driving, and Novi's are great for the strip

 

It hits right away, it just increases as the RPM's rise

Without the blower I was at -10 inches Hg at all rpms, with the blower I'm up to 0 at 2000 rpm, 5 psi @ 4000 rpm, 10 psi @ 6000 rpm

 

What supercharger are u running?

I think what i saw was somethign like this. For the three main chargers all running 10 pounds of boost. The vortech and procharger would see something like 7 psi at 4000 while the novi would be at 5000. Those were just random numbers, but point being the novi builds up faster and later in the RPM's, making it a great strip blower.

 

I've got an aftercooled v2-sq. the boost chart is sitting at home somewhere.

 

Does the V-2 SQ make more power than the V-1 S-trim?

 

ok i found my dyno graph. im at 390 tq at 4500 and slowly drops to 350 at 6k rpms. at 2500 it looks like its at 280 tq a little over 3k its at 300 and keeps rising. ok i stopped being lazy and scanned it.

 

So i'm the lucky guy who finally got you to scan it then, jk

 

they are basically the same but the V2 is quieter

 

My car pulls boost right off the start. I had a bad boost guage while I was on the Dyno. So Next month new tune will be done and will post Dyno sheet. Centri blowers make boost from when you floor it and the boost builds as you build RPM. Roots and screw types have all the boost right off the bat. I was actually shocked to have 377tq 17 over hp but some cars make better hp some make better tq. It is all in the tune and how the motor reacts to the boost.

I have crap 1/4 mile because of extra weight and no traction off the line. 12.8@110.25 once I get the block done I'll have more boost to add but all that will do is keep me spinning off the line.

 

May I ask why don't you invest in better suspension and other things that don't affect HP? I bet you could hit 11's with a little suspension work and other things. Might not even have to change tires?

 

More interested in the motor right now. Once I get the motor done the rear will be swapped and suspension upgraded. And that run was on M/T E/T at 25psi. Car just spun like a ****. I'll probably buy some new struts for the rear for the time being to help it hook better. But in the long run I'll get new axles and a new diff. The car is slowly making it's way to good times. Plus I wanted to take care of the big stuff first. Street car till all is done.

 

prochargers make more torque

 

they also break more stuff, according to you

 

That's an untrue statement. Fact is that centri's put out way more tq than a pos displacement blower (pdb) if they get spun into their efficiency range. Most stock bottom end motors cant handle a novi2k spun into its range w/out blowing up. The efficiency range of most common pdb's is more along the lines of 6-9psi where a good sized centri is more like 11-15psi.

 

I was just wandering, it seemed to me that the majority of numbers I saw had low torque. But if what you say is true that makes sense for not too many of us have a Centri pushing 15PSI on a built block, most are 8 psi on stock bottom.

 

i am making 500tq with 13psi on an intercooled procharger. thats with only 11 degrees timing...for fuel safety measures until i wire my BAP and re tune. centris can make more torque and more power than their compareable positive displacement blowers. why do you think "the people on tv" are using centris? and no im not comparing a 2.4 kenne belle to a vortech sq because i know some idiot was gonna come in and say "random jerkoff made 800rwhp with a kenne bell yada yada"

 

Got a dyno sheet? I'm really interrested in seeing your tq curve. I recently dyno'd my 01gt (novi2k and stock pulley) and although the tq curve was flatter than my prom date it peaked only at 365 ftlbs (made 415whp). I'm starting to think the key is to retard timing and up the boost to get the most of a stock bottom 2V. How long have you been running at 11* of TA?

 

for about a week. its only THAT low because my fuel pumps are maxed out. when i do the BAP and wiring this weekend ill add much more timing, the peak torque will go down but it will rise in the upper RPMs, and HP will rise too. the torque is only as high as it is because of the low timing, and it happens at 3800 rpms, which is a tad under my stall speed. so its worthless to me. with the addition of the timing the peak torque value will probably go down or stay the same, but its RPM will rise. i have a dyno sheet but no scanner, ill take a digital camera and snap a pic of it later when i get off work basically torque shoots upward until 3800 then it peak and falls slowly. if i were to make a tune with full timing my pumps would max out just over 4k rpms

 

What kind of pistons are you using what is the dish size?

 

17cc CP pistons

 

I'm think'n' I might go same route. I want to lower the compression a bit more, but keep it streetable.

 

re tuning is next week. ill see how it performs with fuel and a non-broken rear. im sending the auburn back to the company and they said they will replace the broken pieces inside. so if anyone wants a fresh auburn let me know