procharger with high compression?

P1SCstangGT · June 26th, 2010, 11:49 AM

i have a p1sc and was thinking about getting a forged shot block(still have stock PI heads). My car is a DD and want it to stay that, but i want the most rwhp as possible. i am running 9-10 pounds right now. how high of compression can i go? more compression less boost?anyone have a high compression motor with a blower?

mustanginky · June 26th, 2010, 12:35 PM

i wouldn't go any higher than 10:1 with a blower and 10 lbs. i dunno where you live but if they don't have 93 octane you're kinda screwed lol.

P1SCstangGT · June 26th, 2010, 02:48 PM

I live in AZ and we dont have 93 haha. could i back down the boost? I only have a 6 rib and i dont want to go to a 8 rib. i heard the belt slips around 12 pounds with a 6 rib set up

ModMustang97GT · June 26th, 2010, 03:01 PM

Ok, everyone is going to SCREAM at you that you need low compression, but the truth is you don't NEED to.

There is an article about this exact question in MM&FF that you can look up. I believe its called "the multiplier effect". The truth is that your static compression is only part of it. The higher your static compression, the harder it will be to tune the car, it becomes much more sensitive to timing and tuning in general as your static compression ratio rises. however, if you do a Higher static compression, you will have a much better power band. The power band will start lower and your torque will be much better. On the other hand, with a low compression motor, you can throw more boost at it, and have a safer tuning experience.

With a Centrifugal super charger, it is generally good to have a medium compression ratio. The higher static compression makes it easy to build torque and the not so high static also makes it easier to ramp up boost and tune.

UnixHH · June 26th, 2010, 03:15 PM

FYI i have a procharger on my built motor 9.1:1 compression

MustangGT06 · June 26th, 2010, 03:41 PM

You can run high compression but you'd need some good gas and it's not cheap. I just put half tank of 100 octane and costed $50.

P1SCstangGT · June 26th, 2010, 04:17 PM

Originally Posted by ModMustang97GT

Ok, everyone is going to SCREAM at you that you need low compression, but the truth is you don't NEED to.

There is an article about this exact question in MM&FF that you can look up. I believe its called "the multiplier effect". The truth is that your static compression is only part of it. The higher your static compression, the harder it will be to tune the car, it becomes much more sensitive to timing and tuning in general as your static compression ratio rises. however, if you do a Higher static compression, you will have a much better power band. The power band will start lower and your torque will be much better. On the other hand, with a low compression motor, you can throw more boost at it, and have a safer tuning experience.

With a Centrifugal super charger, it is generally good to have a medium compression ratio. The higher static compression makes it easy to build torque and the not so high static also makes it easier to ramp up boost and tune.

I always go easy on my car, but the times i get on it i want to feel it. i dont go to the track a lot but if i do i want to run well. thats why i was wondering if high compression would be okay. as for tunning im okay cause my tunner is very skillfull.

Originally Posted by UnixHH

FYI i have a procharger on my built motor 9.1:1 compression

and your putting out 470? how much boost?

UnixHH · June 26th, 2010, 04:29 PM

Originally Posted by P1SCstangGT

I always go easy on my car, but the times i get on it i want to feel it. i dont go to the track a lot but if i do i want to run well. thats why i was wondering if high compression would be okay. as for tunning im okay cause my tunner is very skillfull.

and your putting out 470? how much boost?

that was on the stock motor at 9psi stock compression is 9.6:1

mpe331lx · June 26th, 2010, 07:10 PM

Compression is the key to drivebility and efficiency in a centri blown modular (and of coarse the tune!).

Do the 10:1,run a safe amount of boost, have it tuned safely by a reputable tuner.

For a track setup, you can do an aggressive tune on race gas (or methonol)

P1SCstangGT · June 26th, 2010, 07:55 PM

Originally Posted by mpe331lx

Compression is the key to drivebility and efficiency in a centri blown modular (and of coarse the tune!).

Do the 10:1,run a safe amount of boost, have it tuned safely by a reputable tuner.

For a track setup, you can do an aggressive tune on race gas (or methonol)

thats kinda what i was thinking. any one know what cc piston would put me there with stock PI heads?

mustanginky · June 26th, 2010, 10:03 PM

About an 11-13 cc piston.

SWEET2KSTANG · June 26th, 2010, 10:09 PM

Originally Posted by mpe331lx

Compression is the key to drivebility and efficiency in a centri blown modular (and of coarse the tune!).

Do the 10:1,run a safe amount of boost, have it tuned safely by a reputable tuner.

For a track setup, you can do an aggressive tune on race gas (or methonol)

^

June 26th, 2010, 11:49 AM	#1
P1SCstangGT Regular 02 Mustang GT Join Date: Jun 2010 Location: AZ Posts: 153 iTrader: 0 reviews	procharger with high compression? i have a p1sc and was thinking about getting a forged shot block(still have stock PI heads). My car is a DD and want it to stay that, but i want the most rwhp as possible. i am running 9-10 pounds right now. how high of compression can i go? more compression less boost?anyone have a high compression motor with a blower?

June 26th, 2010, 12:35 PM	#2
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,259 iTrader: 2 reviews	i wouldn't go any higher than 10:1 with a blower and 10 lbs. i dunno where you live but if they don't have 93 octane you're kinda screwed lol. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

June 26th, 2010, 03:01 PM	#4
ModMustang97GT Hardcore Enthusiast 1997 Mustang GT Faster than an s4 Join Date: Aug 2007 Location: Seattle, WA Posts: 1,598 iTrader: 0 reviews	Ok, everyone is going to SCREAM at you that you need low compression, but the truth is you don't NEED to. There is an article about this exact question in MM&FF that you can look up. I believe its called "the multiplier effect". The truth is that your static compression is only part of it. The higher your static compression, the harder it will be to tune the car, it becomes much more sensitive to timing and tuning in general as your static compression ratio rises. however, if you do a Higher static compression, you will have a much better power band. The power band will start lower and your torque will be much better. On the other hand, with a low compression motor, you can throw more boost at it, and have a safer tuning experience. With a Centrifugal super charger, it is generally good to have a medium compression ratio. The higher static compression makes it easy to build torque and the not so high static also makes it easier to ramp up boost and tune. __________________ Aztec Gold 97GT. MM CC Plates, Panhard Bar, SFC's & Tower Brace Eibach Sway Bars H&R Race Springs/Bilstein Shocks MAC CAI, LT's, Catted H and Pro-Dumps KB Boost-a-Spark 04' PI Motor Author of The Official Suspension Guide

June 26th, 2010, 03:15 PM	#5
UnixHH MM Fanatic 2003 Saleen S281 Join Date: Nov 2008 Location: Houston, Tx Posts: 4,274 iTrader: 0 reviews	FYI i have a procharger on my built motor 9.1:1 compression __________________ 480RWHP 450RWTQ 15psi @ 15* on 91 octane

June 26th, 2010, 07:10 PM	#9
mpe331lx Regular 9.74@142 Join Date: Dec 2008 Location: SWFL Posts: 367 iTrader: 0 reviews	Compression is the key to drivebility and efficiency in a centri blown modular (and of coarse the tune!). Do the 10:1,run a safe amount of boost, have it tuned safely by a reputable tuner. For a track setup, you can do an aggressive tune on race gas (or methonol) __________________

June 26th, 2010, 02:48 PM	#3
P1SCstangGT Regular 02 Mustang GT Join Date: Jun 2010 Location: AZ Posts: 153 iTrader: 0 reviews	I live in AZ and we dont have 93 haha. could i back down the boost? I only have a 6 rib and i dont want to go to a 8 rib. i heard the belt slips around 12 pounds with a 6 rib set up

June 26th, 2010, 03:41 PM	#6
MustangGT06 Enthusiast Join Date: Aug 2009 Posts: 567 iTrader: 0 reviews	You can run high compression but you'd need some good gas and it's not cheap. I just put half tank of 100 octane and costed $50.

June 26th, 2010, 10:03 PM	#11
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,259 iTrader: 2 reviews	About an 11-13 cc piston. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

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