Low Compression High Boost?

e3sean · November 17th, 2007, 05:00 PM

I know i want to put force induction on my car weather it is a s/c or t/c i am not sure yet but i wanted to know would it be the same if you put high boost on a low compression engine and putting low boost on a high compression engine?? it all boils down to how much compression you have at the top of the stroke right??

CAMN89GT · November 17th, 2007, 05:06 PM

If you're going Power Adder(AKA) Super charger, Turbo, Nitrous .. You need "LOW COMPRESSION PISTONS"

or....

If youre going all motor.... You would use HIGH COMPRESSION Pistons.

00vabchgt · November 17th, 2007, 05:11 PM

the compression would depend on the type of power adder. for a twin screw blower, you need lower compression than for a centri blower. the best thing to do is figure out your plan for the build and then follow that plan. call up different engine builders and see what they recommend for pistons. you can lower your compression by simply increasing the size of the piston dish. hope this helps...

e3sean · November 17th, 2007, 05:31 PM

so i could build a 331 stroker put low compression pistons on it and add a medium size single turbo and be fine..

CAMN89GT · November 17th, 2007, 05:37 PM

Originally Posted by e3sean

so i could build a 331 stroker put low compression pistons on it and add a medium size single turbo and be fine..

Duh. Bro you really need to speak someone on the phone or something about racing engines, no pun intended.

StangAddiction · November 17th, 2007, 05:45 PM

high boost+ low compression = more "torquier"..better for the street and pump gas

low boost+ high compression = more top end power...better for the track and race gas.

please define medium-sized turbo because that's a new one to me.

FOr a 331 you should be looking at something like a MP-T70, PT64, or maybe a GT35R..something along those lines with a .81-.96 A/R or so. 0.68 would work, but i think it'd choke it out up top on a stroker.

e3sean · November 17th, 2007, 05:46 PM

thats why i am here to ask questions..i would rather type it so everyone can see and give their opinion rather then just one person that may or may not know what they are talking about.and if they give me wrong info there 20 other ppl to tell them they are dumb...

e3sean · November 17th, 2007, 09:55 PM

lol hmm i would say a t3/4 would be a medium size

baine21225 · November 18th, 2007, 12:24 AM

how much hp are you looking for? if you were to get a 67mm that could put you in the peak efficiency range with like 450 hp

e3sean · November 18th, 2007, 01:15 AM

ya something like that 67 or 70

baine21225 · November 18th, 2007, 10:31 AM

well a 76 will make like 550-575 in perfect efficiency, and that is too much for your stock block, but that turbo will also make over 1000hp with the supporting mods and a good tune. alot of supra guys run a 76 and make over 1000 to the wheels using a th400

morgan29 · November 18th, 2007, 09:19 PM

ya wiht any forced induction motor you need to go with a low compression..

78mach1 · November 19th, 2007, 12:59 AM

Originally Posted by e3sean

thats why i am here to ask questions..i would rather type it so everyone can see and give their opinion rather then just one person that may or may not know what they are talking about.and if they give me wrong info there 20 other ppl to tell them they are dumb...

hahahaha he has a point there!

i dont know a hole lot on the topic or i would help ya out!

e3sean · November 19th, 2007, 04:32 AM

ya i am gonna do the 331 stroker wit low compression pistons.. anyone know where i can get a desent 331 stroker kit for a desent price???

Drick · November 19th, 2007, 04:34 AM

I was gonna buy the scat 331 stroker assembley from summit its like 900. But im sure there is places that have it alot cheaper

e3sean · November 19th, 2007, 04:43 AM

ya thats about the most i want to spend on one

Drick · November 19th, 2007, 04:46 AM

Yeah I hear ya lol. But HP cost money lol

e3sean · November 19th, 2007, 04:48 AM

ya but some people charge more than others for the same HP. but i deff know what u mean

baine21225 · November 19th, 2007, 01:47 PM

why are you not doing 347?

ryans88gt · November 19th, 2007, 02:13 PM

Originally Posted by CAMN89GT

If you're going Power Adder(AKA) Super charger, Turbo, Nitrous .. You need "LOW COMPRESSION PISTONS"

or....

If youre going all motor.... You would use HIGH COMPRESSION Pistons.

Ohhh shit, you mean my 10.5:1 motor will not work with my nitrous kit... You do not need low compression with nitrous as it is not as prone to detonation, you just need decent octane fuel.

Also, you don't need lower compression for boosted applications unless you are getting up there in boost (10 PSI or more). You can control detonation with an intercooler, pulling timing, appropriate A/F ratio, and high octane fuel. And lower compression is relative. Stock 5.0s only have 9:1 compression, that is pretty good for 15 PSI.

November 17th, 2007, 05:00 PM	#1
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	Low Compression High Boost? I know i want to put force induction on my car weather it is a s/c or t/c i am not sure yet but i wanted to know would it be the same if you put high boost on a low compression engine and putting low boost on a high compression engine?? it all boils down to how much compression you have at the top of the stroke right??

November 17th, 2007, 05:06 PM	#2
CAMN89GT Banned 1988 Mustang Notch it's a bad bitch..i promise Join Date: Dec 2006 Location: Chicago Posts: 980 iTrader: 0 reviews	If you're going Power Adder(AKA) Super charger, Turbo, Nitrous .. You need "LOW COMPRESSION PISTONS" or.... If youre going all motor.... You would use HIGH COMPRESSION Pistons. __________________ '88 Notch ~ T-70 & Faceplated GForce! Tuned by [B][I][U]Kurgan Motorsports[/U][/I][/B]

November 17th, 2007, 05:45 PM	#6
StangAddiction Enthusiast 2000 Mustang GT Join Date: Jan 2007 Location: Virginia Beach Posts: 986 iTrader: 0 reviews	high boost+ low compression = more "torquier"..better for the street and pump gas low boost+ high compression = more top end power...better for the track and race gas. please define medium-sized turbo because that's a new one to me. FOr a 331 you should be looking at something like a MP-T70, PT64, or maybe a GT35R..something along those lines with a .81-.96 A/R or so. 0.68 would work, but i think it'd choke it out up top on a stroker. Last edited by StangAddiction; November 17th, 2007 at 05:48 PM.

November 19th, 2007, 04:34 AM	#15
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	I was gonna buy the scat 331 stroker assembley from summit its like 900. But im sure there is places that have it alot cheaper __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

November 19th, 2007, 04:46 AM	#17
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	Yeah I hear ya lol. But HP cost money lol __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

November 17th, 2007, 05:31 PM	#4
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	so i could build a 331 stroker put low compression pistons on it and add a medium size single turbo and be fine..

November 17th, 2007, 05:46 PM	#7
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	thats why i am here to ask questions..i would rather type it so everyone can see and give their opinion rather then just one person that may or may not know what they are talking about.and if they give me wrong info there 20 other ppl to tell them they are dumb...

November 17th, 2007, 09:55 PM	#8
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	lol hmm i would say a t3/4 would be a medium size

November 18th, 2007, 12:24 AM	#9
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,338 iTrader: 1 reviews	how much hp are you looking for? if you were to get a 67mm that could put you in the peak efficiency range with like 450 hp

November 18th, 2007, 01:15 AM	#10
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	ya something like that 67 or 70

November 18th, 2007, 10:31 AM	#11
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,338 iTrader: 1 reviews	well a 76 will make like 550-575 in perfect efficiency, and that is too much for your stock block, but that turbo will also make over 1000hp with the supporting mods and a good tune. alot of supra guys run a 76 and make over 1000 to the wheels using a th400

November 18th, 2007, 09:19 PM	#12
morgan29 Newbie Join Date: Nov 2007 Posts: 10 iTrader: 0 reviews	ya wiht any forced induction motor you need to go with a low compression..

November 19th, 2007, 04:32 AM	#14
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	ya i am gonna do the 331 stroker wit low compression pistons.. anyone know where i can get a desent 331 stroker kit for a desent price???

November 19th, 2007, 04:43 AM	#16
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	ya thats about the most i want to spend on one

November 19th, 2007, 04:48 AM	#18
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,596 iTrader: 0 reviews	ya but some people charge more than others for the same HP. but i deff know what u mean

November 19th, 2007, 01:47 PM	#19
baine21225 MM Fanatic Join Date: Jun 2007 Location: Baltimore, MD Posts: 4,338 iTrader: 1 reviews	why are you not doing 347?

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