How high is too high?

silver99gt · October 8th, 2007, 10:27 PM

Im thinkin about buildin up a spare motor for my 99 gt just to have ready to go when the one in the car decides to go south. The one im plannin to build should have around 10.5:1 compression. Is that to high of compression to run boost on or even a small shot of nitrous?

RyanGT · October 8th, 2007, 10:37 PM

depends on how much boost, what kind of boost. if its light boost it will be fine. If heavy boost on say a kb you need to lower the compression. No idea about the other blowers since i have a kb. Pretty sure the others like high compression, but if its really high boost im sure you will have to lower compression a bit. Better safe than sorry.... for me at least since i blew my motor awhile back.

What are your ideas of your build?

superbeef1000 · October 8th, 2007, 10:39 PM

i think for the nitrous that compression would be ok but not for the boost

bossman2kgt · October 8th, 2007, 11:22 PM

:homo

SWEET2KSTANG · October 8th, 2007, 11:34 PM

10.5 is a lot of a DD boost car, you would be limited to 6psi and intercooled if you did it. nitrous is not effected by compression like boost is, a nitrous motor loves compression. you will just have to tune it to where you want it and how much nitrous you want to run.

MATT02GT · October 8th, 2007, 11:34 PM

drop it to a 9:5--8:5 and throw lotsa boost at it

Onemanzu · October 9th, 2007, 01:17 AM

lower compression higher boost-ability
high compression lower boost-ability

i say you try runnin something nuts like a 12.5 with a 150 shot

rk_2000_Z/28 · October 9th, 2007, 01:55 AM

As already stated, that's pretty high for a boosted car.

You'll be fine spraying nitrous though.

Fryrice · October 9th, 2007, 06:34 AM

Originally Posted by rk_2000_Z/28

As already stated, that's pretty high for a boosted car.

You'll be fine spraying nitrous though.

Nice SS man.

mustangmanic · October 9th, 2007, 10:43 AM

How do you change the compression? Different Pistons?

rk_2000_Z/28 · October 9th, 2007, 02:29 PM

Originally Posted by Fryrice

Originally Posted by rk_2000_Z/28

As already stated, that's pretty high for a boosted car.

You'll be fine spraying nitrous though.

Nice SS man.

Gracias

rk_2000_Z/28 · October 9th, 2007, 02:32 PM

Originally Posted by mustangmanic

How do you change the compression? Different Pistons?

That's one way. Also swapping heads can change your compresion ratio

Drgnracin72 · October 9th, 2007, 03:40 PM

thats too high for a boosted motor but could be done, with a good tune and good fuel, but 9.5 with a centri blower is perfect, high compression with nitrous is no problem at all

silver99gt · October 9th, 2007, 07:11 PM

The plan for the motor came from one of my motor building books i have here. They took a 98 block and put a set of PI ported heads and some non PI cams in it and then ran all bolt ons with a stock PI intake and made around 415 hp at the crank. They said that by running the PI heads on the non PI block is what boosts the compression up so much.

October 8th, 2007, 10:27 PM	#1
silver99gt Regular 1998 Camaro SS Join Date: Apr 2007 Location: Long Island, Kansas Posts: 431 iTrader: 1 reviews	How high is too high? Im thinkin about buildin up a spare motor for my 99 gt just to have ready to go when the one in the car decides to go south. The one im plannin to build should have around 10.5:1 compression. Is that to high of compression to run boost on or even a small shot of nitrous?

October 8th, 2007, 10:39 PM	#3
superbeef1000 Hardcore Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 1,474 iTrader: 2 reviews	i think for the nitrous that compression would be ok but not for the boost __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

October 8th, 2007, 11:34 PM	#5
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	10.5 is a lot of a DD boost car, you would be limited to 6psi and intercooled if you did it. nitrous is not effected by compression like boost is, a nitrous motor loves compression. you will just have to tune it to where you want it and how much nitrous you want to run. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 8th, 2007, 11:34 PM	#6
MATT02GT The Mean Green Join Date: May 2007 Location: Colo. Springs, CO Posts: 4,164 iTrader: 1 reviews	drop it to a 9:5--8:5 and throw lotsa boost at it __________________ Its not how fast you drive, but how you drive fast. 2002 Mustang GT... Just The Usual Bolt-Ons Bolt on list in Garage..

October 9th, 2007, 01:17 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	lower compression higher boost-ability high compression lower boost-ability i say you try runnin something nuts like a 12.5 with a 150 shot __________________ My Foz

October 8th, 2007, 10:37 PM	#2
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	depends on how much boost, what kind of boost. if its light boost it will be fine. If heavy boost on say a kb you need to lower the compression. No idea about the other blowers since i have a kb. Pretty sure the others like high compression, but if its really high boost im sure you will have to lower compression a bit. Better safe than sorry.... for me at least since i blew my motor awhile back. What are your ideas of your build?

October 8th, 2007, 11:22 PM	#4
bossman2kgt Hardcore Enthusiast Join Date: May 2007 Location: Wichita, Ks Posts: 1,287 iTrader: 0 reviews	:homo

October 9th, 2007, 01:55 AM	#8
rk_2000_Z/28 Forever in our hearts travis_afx 2003 SVT Cobra Join Date: Apr 2007 Location: Enid, OK Posts: 4,312 iTrader: 0 reviews	As already stated, that's pretty high for a boosted car. You'll be fine spraying nitrous though. __________________ 03 Cobra-Slow 02 SS, 00 Z/28-Gone Rest In Peace Travis Billings

October 9th, 2007, 10:43 AM	#10
mustangmanic MM Fanatic 2002 Mustang GT 13.334 @ 106.27 w/2.01 60' Join Date: May 2007 Location: Indianapolis Posts: 3,107 iTrader: 2 reviews	How do you change the compression? Different Pistons? __________________

October 9th, 2007, 03:40 PM	#13
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,635 iTrader: 2 reviews	thats too high for a boosted motor but could be done, with a good tune and good fuel, but 9.5 with a centri blower is perfect, high compression with nitrous is no problem at all __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

October 9th, 2007, 07:11 PM	#14
silver99gt Regular 1998 Camaro SS Join Date: Apr 2007 Location: Long Island, Kansas Posts: 431 iTrader: 1 reviews	The plan for the motor came from one of my motor building books i have here. They took a 98 block and put a set of PI ported heads and some non PI cams in it and then ran all bolt ons with a stock PI intake and made around 415 hp at the crank. They said that by running the PI heads on the non PI block is what boosts the compression up so much.

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