A Question About Prochager With High Compression

blue03mach1 · November 7th, 2007, 08:14 PM

is it true that prochargers like high compression? if it is... why? i no using a whipple is bad for high compression...i dont get it? just want to understand thanks!

gsjohnson · November 8th, 2007, 12:00 AM

Not sure where you got that one, but Prochargers like any other F/I system need low compresion.

TheBusher · November 8th, 2007, 12:22 AM

Originally Posted by gsjohnson

Not sure where you got that one, but Prochargers like any other F/I system need low compresion.

+1 I've heard people say that before and it's bogus... unless you WANT your car to be spittin' chunks of rods out the exhaust. If that's the case, then make sure someone you hate is behind you.

This little read might help a bit...

http://www.motorsportsdigest.com/tech/forced2.htm

MATT02GT · November 8th, 2007, 12:37 AM

Boost = low compression

Garhfer · November 8th, 2007, 12:41 AM

Originally Posted by MATT02GT

Boost = low compression

+1 hopefully if they know wtf they're doing

MustangMatt96GT · November 8th, 2007, 01:09 AM

but boost really likes compression, stock moyors dont like both. You will make more power with a high comprssion motor and blower and can do it safely with race gas, and forged inturnals.

Onemanzu · November 8th, 2007, 01:16 AM

i have always been told run a lower compression ... around 8.5-9 when boosting ... on the other hand... if you have a strong motor and a bottle ... you can crank that compression out the ass... 11 and up if you wanted

SWEET2KSTANG · November 8th, 2007, 01:16 AM

cylinder pressure! the roots and screw blower almost instantly deliver full boost. instantly creating higher pressures. a centri is a little more forgiving since the boost is not all or nothing. you can run a little higher compression and get away with it since timing and fuel tables are adjustable through the rpm range. cyinder pressure will still be high, but can also be tuned out if everything is done properly.

Drgnracin72 · November 8th, 2007, 01:08 PM

Originally Posted by MustangMatt96GT

but boost really likes compression, stock moyors dont like both. You will make more power with a high comprssion motor and blower and can do it safely with race gas, and forged inturnals.

right on buddy, lots of misinformation in this thread, the more compression and boost you run, the more power youll make, but it takes great gas and a tune thats spot on. its true that centri blowers like more compression than the tqin screw blowers. weve ran the centris on motors up to 10.5:1 and never had any problems. your safe to run a procharger on your car, but i would suggest looking into paxton novi 2000 for your car

MustangMatt96GT · November 8th, 2007, 01:24 PM

agreed paxton Novi 2000 FTW!

And yes too man people dont understand that to make power, you need more air, higher octane fuel, and cooler air temps. The problem is that stock rods, pistons, and crank do not enjoy the higher pressures, with out pulling a bunch of timing or running 116 octane race gas.

acmillr · November 8th, 2007, 07:22 PM

The reason that people run less compression and more boost is because the more boost you can get, the more the motor will be helped out on the intake stroke by the blower. That is why a blower makes HP- it creates loads of compression on the firing stroke by packing the cylinder with more air and then pressurizing the intake stroke as well. However, by adjusting fuel octane and timing, more boost can be run even with high compression.

SWEET2KSTANG · November 8th, 2007, 07:59 PM

less sylinder pressure will be more forgiving on pump gas. the more you start pushing the motor the higher the octane will have to be used. then streetability will start to become a factor. that is another reason that the centri's will be a little more forgiving too.

MATT02GT · November 8th, 2007, 11:47 PM

You better have a far from stock motor to run 10.5.1 or more with a charger. the lower the compression, the most boost you can throw at it. These motors arent very good N/A a.k.a high compression.

04GTAMPA · November 9th, 2007, 11:48 AM

Again, the tune makes it or breaks it. If you can do a 8:5-1 or 9, you can safely run a pro charger @ 10+ lbs of boost on pump gas and still make good numbers, provided that you have a motor that can handle it.

Drgnracin72 · November 9th, 2007, 12:37 PM

Originally Posted by MATT02GT

You better have a far from stock motor to run 10.5.1 or more with a charger. the lower the compression, the most boost you can throw at it. These motors arent very good N/A a.k.a high compression.

whats wrong with making more power with less boost?

gsjohnson · November 9th, 2007, 02:46 PM

So how long do you think the rings will last with high compression and 10-12 pounds of boost? And I'm not sure we're talking about a 100,000 mile pump gas street driven car here? We use to run our 300ZX Turbo race car under these stresses and we were going thru the motors every 2 races (Endurance road racing). So, if we're talking race cars/motors here, then answer would be different.

November 7th, 2007, 08:14 PM	#1
blue03mach1 Enthusiast Join Date: Jun 2007 Posts: 522 iTrader: 0 reviews	A Question About Prochager With High Compression is it true that prochargers like high compression? if it is... why? i no using a whipple is bad for high compression...i dont get it? just want to understand thanks!

November 8th, 2007, 12:00 AM	#2
gsjohnson Enthusiast Join Date: Sep 2007 Location: Woodland Hills, CA Posts: 682 iTrader: 0 reviews	Not sure where you got that one, but Prochargers like any other F/I system need low compresion. __________________ 2004 Mustang GT The difference between a girlfriend and wife is about 50 pounds.

November 8th, 2007, 12:37 AM	#4
MATT02GT The Mean Green Join Date: May 2007 Location: Colo. Springs, CO Posts: 4,164 iTrader: 1 reviews	Boost = low compression __________________ Its not how fast you drive, but how you drive fast. 2002 Mustang GT... Just The Usual Bolt-Ons Bolt on list in Garage..

November 8th, 2007, 01:09 AM	#6
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	but boost really likes compression, stock moyors dont like both. You will make more power with a high comprssion motor and blower and can do it safely with race gas, and forged inturnals. __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

November 8th, 2007, 01:16 AM	#7
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,550 Blog Entries: 1 iTrader: 0 reviews	i have always been told run a lower compression ... around 8.5-9 when boosting ... on the other hand... if you have a strong motor and a bottle ... you can crank that compression out the ass... 11 and up if you wanted __________________ My Foz

November 8th, 2007, 01:16 AM	#8
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	cylinder pressure! the roots and screw blower almost instantly deliver full boost. instantly creating higher pressures. a centri is a little more forgiving since the boost is not all or nothing. you can run a little higher compression and get away with it since timing and fuel tables are adjustable through the rpm range. cyinder pressure will still be high, but can also be tuned out if everything is done properly. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

November 8th, 2007, 01:24 PM	#10
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	agreed paxton Novi 2000 FTW! And yes too man people dont understand that to make power, you need more air, higher octane fuel, and cooler air temps. The problem is that stock rods, pistons, and crank do not enjoy the higher pressures, with out pulling a bunch of timing or running 116 octane race gas. __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

November 8th, 2007, 07:22 PM	#11
acmillr MM's Mad Scientist Slow Fella Join Date: Jul 2006 Location: Tupelo, MS Posts: 5,111 iTrader: 2 reviews	The reason that people run less compression and more boost is because the more boost you can get, the more the motor will be helped out on the intake stroke by the blower. That is why a blower makes HP- it creates loads of compression on the firing stroke by packing the cylinder with more air and then pressurizing the intake stroke as well. However, by adjusting fuel octane and timing, more boost can be run even with high compression. __________________

November 8th, 2007, 07:59 PM	#12
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	less sylinder pressure will be more forgiving on pump gas. the more you start pushing the motor the higher the octane will have to be used. then streetability will start to become a factor. that is another reason that the centri's will be a little more forgiving too. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

November 8th, 2007, 11:47 PM	#13
MATT02GT The Mean Green Join Date: May 2007 Location: Colo. Springs, CO Posts: 4,164 iTrader: 1 reviews	You better have a far from stock motor to run 10.5.1 or more with a charger. the lower the compression, the most boost you can throw at it. These motors arent very good N/A a.k.a high compression. __________________ Its not how fast you drive, but how you drive fast. 2002 Mustang GT... Just The Usual Bolt-Ons Bolt on list in Garage..

November 9th, 2007, 11:48 AM	#14
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	Again, the tune makes it or breaks it. If you can do a 8:5-1 or 9, you can safely run a pro charger @ 10+ lbs of boost on pump gas and still make good numbers, provided that you have a motor that can handle it. __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

November 9th, 2007, 02:46 PM	#16
gsjohnson Enthusiast Join Date: Sep 2007 Location: Woodland Hills, CA Posts: 682 iTrader: 0 reviews	So how long do you think the rings will last with high compression and 10-12 pounds of boost? And I'm not sure we're talking about a 100,000 mile pump gas street driven car here? We use to run our 300ZX Turbo race car under these stresses and we were going thru the motors every 2 races (Endurance road racing). So, if we're talking race cars/motors here, then answer would be different. __________________ 2004 Mustang GT The difference between a girlfriend and wife is about 50 pounds.

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