How much boost before she blows?

04 3.9 Mustang · 02-23-2005, 01:26 PM

I have a 2004 3.9 and want to know how much intercooled supercharged PSI the motor can take? Engine condition is like new but about 17,000 miles on the ticker. Also I'll be using a Eaton M90. Would 38# injectors work or should I go with 42#? and who in colorado can tune the computer to work with these mods?

ThePunisher · 02-25-2005, 06:48 PM

Quote:

Originally Posted by 04 3.9 Mustang

I have a 2004 3.9 and want to know how much intercooled supercharged PSI the motor can take? Engine condition is like new but about 17,000 miles on the ticker. Also I'll be using a Eaton M90. Would 38# injectors work or should I go with 42#? and who in colorado can tune the computer to work with these mods?

This might be conservative to some but I wouldnt go over 8psi on a stock motor. Not sure about a tuner in Col.

tedinde · 02-25-2005, 10:11 PM

did you do the mod yourself and it's running. Got some pics?? Sweet setup, cheap for insurance, good on gas, and V8 power when you need it. It should probably take more than 8lbs if it's intercooled. I had a super coupe before and used to push 12lbs through it no problem. The wife blew the head gaskets after putting some 87 octane in it. I had the heads oringed. and head studs and upped the boost to 15lbs and drove it for 2 years before i sold it back in the late 1980's.

it's all up to the tune on the question 'HOW MUCH BOOST TILL SHE BLOWS"!!!

Scott02GT · 02-27-2005, 09:23 PM

Do you have a v6?, I think you mean 3.8. I wouldn't reun no more than 8 pounds thru that stock engine

spike_africa · 02-28-2005, 07:26 AM

Quote:

Originally Posted by Scott02GT

Do you have a v6?, I think you mean 3.8. I wouldn't reun no more than 8 pounds thru that stock engine

on the 3.8 with stock block and a good tune 14psi is max. but this is pushing it i would hold it off around 12

Scott02GT · 02-28-2005, 09:02 AM

I wouldn't, if you want the engine to last a normal life, 8 pounds would be my max, if you want to rebuild it in a year or two, then by all means, have fun.

TayWolf55 · 02-28-2005, 04:44 PM

11 PSI is max for a v6 mustang with a stock bottom end. 8 psi is probably better, but with a good tune 11 will be fine.

Make sure you check 3.8mustang.com - lots of good information there... I've personally been a member for almost 2 years now.

spike_africa · 02-28-2005, 07:00 PM

That site sucks deek for information v6power.net is way better.

And again i am telling you it will be fine with 12#'s

My freind ha sa 94 with a 2000 split port headed motor and a ati kicking 12.5 pounds its quick needless to say and runs well.

TayWolf55 · 02-28-2005, 07:12 PM

Quote:

Originally Posted by spike_africa

That site sucks deek for information v6power.net is way better.

And again i am telling you it will be fine with 12#'s

My freind ha sa 94 with a 2000 split port headed motor and a ati kicking 12.5 pounds its quick needless to say and runs well.

12+ pounds is pushing your luck but with a good tune its possible. I personally wouldnt do it... i would stick with 11 using the procharger setup.

spike_africa · 03-01-2005, 07:29 AM

that the kit he has it shows 12.5 or so on the 1-2 2-3 shift

02-23-2005, 01:26 PM	#1 (permalink)
04 3.9 Mustang Junior Member Join Date: Feb 2005 Posts: 5	How much boost before she blows? I have a 2004 3.9 and want to know how much intercooled supercharged PSI the motor can take? Engine condition is like new but about 17,000 miles on the ticker. Also I'll be using a Eaton M90. Would 38# injectors work or should I go with 42#? and who in colorado can tune the computer to work with these mods?

02-25-2005, 10:11 PM	#3 (permalink)
tedinde Senior Member Join Date: Jan 2005 Location: Bear Delaware Posts: 220	did you do the mod yourself and it's running. Got some pics?? Sweet setup, cheap for insurance, good on gas, and V8 power when you need it. It should probably take more than 8lbs if it's intercooled. I had a super coupe before and used to push 12lbs through it no problem. The wife blew the head gaskets after putting some 87 octane in it. I had the heads oringed. and head studs and upped the boost to 15lbs and drove it for 2 years before i sold it back in the late 1980's. it's all up to the tune on the question 'HOW MUCH BOOST TILL SHE BLOWS"!!! __________________ 1997GT SOHC, PI Heads,intake, SCT 4 bank, UPR CAI Zex Nitrous system 125 hp shot,Steeda Tri-AX March Underdrive pullies,2 1/2 O/R Pipe, Magnaflow Catbacks,Mac Upper and lower Control arms,5 speed 4.10 Gears,31 spline, Nitto 555 drag radials Spinning

02-28-2005, 04:44 PM	#7 (permalink)
TayWolf55 Senior Member Join Date: Sep 2004 Location: Ozark, MO Posts: 597	11 PSI is max for a v6 mustang with a stock bottom end. 8 psi is probably better, but with a good tune 11 will be fine. Make sure you check 3.8mustang.com - lots of good information there... I've personally been a member for almost 2 years now. __________________ 2004 Mustang GT 5 Speed Mac O/R H Pipe Mac Flowpath Catback JLT Ram Air Intake SCT XCal 2 Tuner FRPP 4.10 Gears 13.191 @ 103.78

02-28-2005, 07:00 PM	#8 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 6,971	That site sucks deek for information v6power.net is way better. And again i am telling you it will be fine with 12#'s My freind ha sa 94 with a 2000 split port headed motor and a ati kicking 12.5 pounds its quick needless to say and runs well. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

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02-27-2005, 09:23 PM	#4 (permalink)
Scott02GT Yeah, right Join Date: Nov 2004 Posts: 107	Do you have a v6?, I think you mean 3.8. I wouldn't reun no more than 8 pounds thru that stock engine

02-28-2005, 09:02 AM	#6 (permalink)
Scott02GT Yeah, right Join Date: Nov 2004 Posts: 107	I wouldn't, if you want the engine to last a normal life, 8 pounds would be my max, if you want to rebuild it in a year or two, then by all means, have fun.

03-01-2005, 07:29 AM	#10 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 6,971	that the kit he has it shows 12.5 or so on the 1-2 2-3 shift

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