Engine Build - Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority

UVRUGBY · January 11th, 2012, 11:11 PM

So I am getting ready to purchase the parts for a full engine build and have questions that I am not finding in the forum. Things I have found are somewhat helpful, but aren't fully answering my questions.

So I have a machine shop that is going to rebuild and machine the good ol 6G75 for me for a $1000 for everything, I just bring in the parts. the company has 50+ years of building race engines between 2 OG's.

the OG that is hooking me up wants to go with a .020 overbore. I see the pistons we want to go with, but will those work with that big of a bore? I have been looking at the forum fyi: upgrades needed thread, and seeing everything needed, as well as the complete 3.8L gt Mods thread.

I have already ordered the FIC from BrianJ so that im not worried about. One more thing, with a whole engine rebuild would the fuel system need to be upgraded to keep up with the rebuild?

dejectedangle · January 11th, 2012, 11:27 PM

yes .20 is fine i went .40 over stock

fuel system all depends on th hp your shooting for...

UVRUGBY · January 11th, 2012, 11:34 PM

alright. .40 is just fine then?
and I am shooting for at least 350 whp. before I boost it (FI in the near future). I know when I boost it I will need to upgrade fuel system.

midnight07GT · January 12th, 2012, 02:16 PM

You're shooting for 350whp n/a?

mrgibs121 · January 12th, 2012, 02:46 PM

you should either shoot for high NA horsepower or high boost horsepower... to get 350 NA you will probably need to up the compression.. at which point boosting is a bad idea... id pick one or the other honestly unless you enjoy doing very expensive things twice lol

UVRUGBY · January 12th, 2012, 03:29 PM

Well I am going to go with a saucer style piston to drop the compression now, but rebuilding the whole engine to be able to accept high boost levels. so I don't end up throwing anything through the block. But with my engine builder he says shooting for that high NA just with what he will be doing will be a easy shot. and the 350 whp was a typo. I meant 350 chp.

dejectedangle · January 12th, 2012, 03:30 PM

One or the other..... If you want 350 horsepower your cheapest and easiest way is to build a motor capable to handel FI...

The only reason I'd stay away from a na build is lack of aftermarket support For the 6g75.... Also parts for this engine is not cheap...

UVRUGBY · January 12th, 2012, 04:14 PM

ya, that is what i have come about with my research, but the parts are well worth the money when building it for high levels of boost.

Wingo171 · January 16th, 2012, 08:53 PM

I could do a great port job for you on the intake and heads to maximize the potential of the motor even before you go FI. Even if you keep it N/A the benefits are still there! This would be a great time to consider it while your engine is still outside the car and in progress of being built!

UVRUGBY · January 16th, 2012, 11:42 PM

my engine guy is going to to port and polish for me.
thanks for the offer though. If anything changes with that I will get at you.

Wingo171 · January 17th, 2012, 04:19 PM

Looking forward to seeing your build completed!

UVRUGBY · January 17th, 2012, 04:50 PM

as am I. I will get picks up for step by step when I get started up.

TwilsonD7 · January 17th, 2012, 08:32 PM

350 all you need is NOS on a stock motor...$1000 just to bore and reassemble isn't crazy but a tad high. Engine parts alone will run 2500-3000 if you plan on replacing pistons rods gaskets....1000 or two in labor to pull the motor and reinstall. You're attending WAY too much for just another 50hp over full bolt ons.

Headers, intake, exhaust, FIC, NOS can all be done in a day or two of way less and get you 350-400ho

UVRUGBY · January 18th, 2012, 12:29 AM

twilson, my dad will pull and transfer my engine to the shop that is going to do the rebuild for $1000. and NOS is basically illegal to run in UTAH. If I am running NOS then the reg is: you can have all of the linkage in your car but you're not allowed to have a full bottle hooked up. If there is a bottle I believe the valve has to be in the off position. so running NOS is pointless in the state of UTAH.

deprydation · January 18th, 2012, 02:43 AM

Street racing is illegal anyways.

Remote bottle openers FTW.

UVRUGBY · January 18th, 2012, 09:38 AM

true, street racing is illegal, but we all know that we do it every once and a while.
Haven't you guys seen the video when the honda that is NOS'd races this banchee 4wheeler. the Honda gets like a inch and the engine starts on fire. here is the vid.

MISCHIEF INVASION - BANSHEE vs CRX - YouTube

Spyderman2007 · January 18th, 2012, 09:47 AM

wow! crazy vid!

mrgibs121 · January 18th, 2012, 10:42 AM

lol massive intake backfire then probably just raw gas burning?

UVRUGBY · January 18th, 2012, 11:03 PM

ya, this would suck very very bad!!

January 11th, 2012, 11:11 PM	#1 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	Engine Build So I am getting ready to purchase the parts for a full engine build and have questions that I am not finding in the forum. Things I have found are somewhat helpful, but aren't fully answering my questions. So I have a machine shop that is going to rebuild and machine the good ol 6G75 for me for a $1000 for everything, I just bring in the parts. the company has 50+ years of building race engines between 2 OG's. the OG that is hooking me up wants to go with a .020 overbore. I see the pistons we want to go with, but will those work with that big of a bore? I have been looking at the forum fyi: upgrades needed thread, and seeing everything needed, as well as the complete 3.8L gt Mods thread. I have already ordered the FIC from BrianJ so that im not worried about. One more thing, with a whole engine rebuild would the fuel system need to be upgraded to keep up with the rebuild? __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 11th, 2012, 11:27 PM	#2 (permalink)
dejectedangle OWNER OF C4G Name: Rick Join Date: Mar 2009 Location: Connecticut/ NY Vehicle: 2008 GT-SC Posts: 2,902 Rep Power: 6	yes .20 is fine i went .40 over stock fuel system all depends on th hp your shooting for... __________________ THE FIRST EVER 4G RUNNING STG 3 SUPERCHARGER TEAM BIG SUPERCHARGEERS

January 11th, 2012, 11:34 PM	#3 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	alright. .40 is just fine then? and I am shooting for at least 350 whp. before I boost it (FI in the near future). I know when I boost it I will need to upgrade fuel system. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 12th, 2012, 02:46 PM	#5 (permalink)
mrgibs121 Senior Member Join Date: Jun 2007 Vehicle: 2007 eclipse GS Posts: 379 Rep Power: 5	you should either shoot for high NA horsepower or high boost horsepower... to get 350 NA you will probably need to up the compression.. at which point boosting is a bad idea... id pick one or the other honestly unless you enjoy doing very expensive things twice lol __________________ 07 eclipse GS MT,AEM FIC with harness, RRE UD pulley, TB coolant bypass, ACT 6 puck ceramic clutch, Fidanza 8.5lb flywheel, AEM UEGO wideband, WRX 440cc blue injectors, custom boosted @ 8psi on a gt35 clone snail, custom tubular turbo manifold, wyntonm BOV and wastegate, 3" turbo back with catalytic converter, bronze helical 2.6GPM oil scavenging system and secondary filter, tanabe strut tower bar, megan lowering springs

January 12th, 2012, 03:29 PM	#6 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	Well I am going to go with a saucer style piston to drop the compression now, but rebuilding the whole engine to be able to accept high boost levels. so I don't end up throwing anything through the block. But with my engine builder he says shooting for that high NA just with what he will be doing will be a easy shot. and the 350 whp was a typo. I meant 350 chp. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green. Last edited by UVRUGBY; January 12th, 2012 at 03:39 PM.

		Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority > Performance and Technical > Eclipse Performance
Engine Build

January 12th, 2012, 02:16 PM	#4 (permalink)
midnight07GT I got this Name: Scott Join Date: Aug 2011 Location: Pennsylvania Vehicle: 2007 eclipse gt Posts: 295 Rep Power: 1	You're shooting for 350whp n/a?

January 12th, 2012, 03:30 PM	#7 (permalink)
dejectedangle OWNER OF C4G Name: Rick Join Date: Mar 2009 Location: Connecticut/ NY Vehicle: 2008 GT-SC Posts: 2,902 Rep Power: 6	One or the other..... If you want 350 horsepower your cheapest and easiest way is to build a motor capable to handel FI... The only reason I'd stay away from a na build is lack of aftermarket support For the 6g75.... Also parts for this engine is not cheap... __________________ THE FIRST EVER 4G RUNNING STG 3 SUPERCHARGER TEAM BIG SUPERCHARGEERS

January 12th, 2012, 04:14 PM	#8 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	ya, that is what i have come about with my research, but the parts are well worth the money when building it for high levels of boost. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 16th, 2012, 08:53 PM	#9 (permalink)
Wingo171 Senior Member Name: Brandon Join Date: Apr 2008 Location: Columbus, Ohio Vehicle: 1991/Mitsubishi/3kgt VR4 Posts: 103 Rep Power: 5	I could do a great port job for you on the intake and heads to maximize the potential of the motor even before you go FI. Even if you keep it N/A the benefits are still there! This would be a great time to consider it while your engine is still outside the car and in progress of being built!

January 16th, 2012, 11:42 PM	#10 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	my engine guy is going to to port and polish for me. thanks for the offer though. If anything changes with that I will get at you. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 17th, 2012, 04:19 PM	#11 (permalink)
Wingo171 Senior Member Name: Brandon Join Date: Apr 2008 Location: Columbus, Ohio Vehicle: 1991/Mitsubishi/3kgt VR4 Posts: 103 Rep Power: 5	Looking forward to seeing your build completed!

January 17th, 2012, 04:50 PM	#12 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	as am I. I will get picks up for step by step when I get started up. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 17th, 2012, 08:32 PM	#13 (permalink)
TwilsonD7 Senior Member Name: Thomas Join Date: Sep 2007 Location: Fort Lauderdale Fl Vehicle: 2008/Eclipse/GT Posts: 4,176 Rep Power: 10	350 all you need is NOS on a stock motor...$1000 just to bore and reassemble isn't crazy but a tad high. Engine parts alone will run 2500-3000 if you plan on replacing pistons rods gaskets....1000 or two in labor to pull the motor and reinstall. You're attending WAY too much for just another 50hp over full bolt ons. Headers, intake, exhaust, FIC, NOS can all be done in a day or two of way less and get you 350-400ho

January 18th, 2012, 12:29 AM	#14 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	twilson, my dad will pull and transfer my engine to the shop that is going to do the rebuild for $1000. and NOS is basically illegal to run in UTAH. If I am running NOS then the reg is: you can have all of the linkage in your car but you're not allowed to have a full bottle hooked up. If there is a bottle I believe the valve has to be in the off position. so running NOS is pointless in the state of UTAH. __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

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January 18th, 2012, 09:38 AM	#16 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	true, street racing is illegal, but we all know that we do it every once and a while. Haven't you guys seen the video when the honda that is NOS'd races this banchee 4wheeler. the Honda gets like a inch and the engine starts on fire. here is the vid. MISCHIEF INVASION - BANSHEE vs CRX - YouTube __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

January 18th, 2012, 09:47 AM	#17 (permalink)
Spyderman2007 Senior Member Name: Ryan Join Date: Nov 2011 Location: Marietta PA Vehicle: 07 eclipse sypder GT Posts: 1,599 Rep Power: 2	wow! crazy vid! __________________ -getn my mod on ya'll- http://club4g.org/board/members-ride...spyder-gt.html

January 18th, 2012, 10:42 AM	#18 (permalink)
mrgibs121 Senior Member Join Date: Jun 2007 Vehicle: 2007 eclipse GS Posts: 379 Rep Power: 5	lol massive intake backfire then probably just raw gas burning? __________________ 07 eclipse GS MT,AEM FIC with harness, RRE UD pulley, TB coolant bypass, ACT 6 puck ceramic clutch, Fidanza 8.5lb flywheel, AEM UEGO wideband, WRX 440cc blue injectors, custom boosted @ 8psi on a gt35 clone snail, custom tubular turbo manifold, wyntonm BOV and wastegate, 3" turbo back with catalytic converter, bronze helical 2.6GPM oil scavenging system and secondary filter, tanabe strut tower bar, megan lowering springs

January 18th, 2012, 11:03 PM	#19 (permalink)
UVRUGBY Senior Member Name: RJ Join Date: Dec 2011 Location: Orem, Ut Vehicle: 06 Eclipse GT Posts: 261 Rep Power: 1	ya, this would suck very very bad!! __________________ Build up of Black and Blue. - TB Bypass, OEM Air Box Mod. Quote- "We all the same color with the lights off." - Celo Green.

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