Anyhow, I have a stock bottom end in my 93 with 67k miles, AFR 165 heads 58cc heads. I just picked up a S trim. Will running 10psi WITH a good tune be ok?
93gt, 58cc heads, 10 psi... Am I retarded?
- Thread starter GroverDill
- Start date
TwinTurbo93
Founding Member
More than likely going to take race gas to be safe. Assuming everything else on your car is stock (bore, ect.) then your static compression ratio is 9.42:1. With 10psi that makes your effictive compression ratio right about 16.0:1. My car has 8.2:1 compression and I've run it at 15psi. My effective compression ratio is about 16.7:1, but you gotta factor in that I have a very effecient intercooler and I use 104 unleaded at that boost pressure. So yes it will work but it may not be a daily driver at 10 psi.
Talk to a tuner before making any decisions. I know some of the modular folks using almost 25-30psi of boost on nearly stock Cobra engines...BUT not a stock computer calibration, and of course, a lot more fuel delivery. Yes, a higher octane fuel may be advantageous, but doesn't mean you can't run 9-12psi with your 58cc heads. I think most folks would agree that if you are going to run boost, it's best to have it tuned by a professional using a laptop, dyno, and a wide-band O2 sensor. A "safe", "conservative" tune may allow you to run at higher boost levels using pump gas. Just for giggles, give Alternative Auto Performance a call, and get their thoughts on the best way to go about it.
www.alternativeauto.com
www.alternativeauto.com
Mike86Stang
Advanced Member
I'd say it's pushing it but can be done on pump gas. Timing will have to be retarded more than ussual. Might think about getting a boost retard.
5.0 HOtrain
Founding Member
5.0 HOtrain
Founding Member
5.0 HOtrain
Founding Member
GroverDill said:
FWIW, my friend Cory (swinerton on corral) os stock 65k short block with tfs heads,stageI cam, and track heat with a pullied "S" trim made 508/488 at the wheels. It blew head gaskets, at 13psi. Figure pullied down to 8psi you should be "safe" with a good tune. Keep us posted, did you get a polished one? Aftercooler would help too.
mike.
IndyBlk5.0
New Member
honestly grover, if you do in fact have hypereautic pistons, i would not even run boost at all... they sure dont like detonation... Anything about 4-5 psi on hyper pistons i would concider dangerous...
94Blue302GT
Member
TwinTurbo93
Founding Member
Hyperutectic pistons can handle the boost as long as the car is always run with a good tune, there have been many stock shortblock forced induction mustangs in the 10's, one in perticular has been as fast as 10.30's at 135+mph and had a 93 motor with hyperutectic pistons, when he did eventually split his block it did just that - no broken pistons. The problem you are going to run into is if you are going to need race gas with that much boost and compression, with an 8 psi pulley you will be fine, if it turns out that you do need race gas to run 10psi then just swap pullies and add some good fuel when you want to go faster 
. Water/alkahol injection would be an excellent solution to this problem as well, but then again it might not be practical to drive it daily at that boost level if the injection system is required. Ask a reputable tuner if they think you will need race gas when running 9.5:1 compression and 10psi and go from there Good luck!
. Water/alkahol injection would be an excellent solution to this problem as well, but then again it might not be practical to drive it daily at that boost level if the injection system is required. Ask a reputable tuner if they think you will need race gas when running 9.5:1 compression and 10psi and go from there Good luck!
I agree, too many people think the hyper pistons will instantly turn to dust, but there are lots of blown 93+ with hypers running out there,
I will without a doubt have a nice tune put on the car before it gets and serious abuse.
With that said, Imna run it with the 10psi pulley
I will without a doubt have a nice tune put on the car before it gets and serious abuse.
With that said, Imna run it with the 10psi pulley
TwinTurbo93
Founding Member
IndyBlk5.0
New Member
let me know how that goes, i have hyper pistons too, wondering if it will work out fine or not, good luck!!!!!
5.0 HOtrain
Founding Member
GroverDill said:
Good man, have you condsidered any type of fuel management system?? What about you're fuel system, what are you considering for upgrades there, rails at the minimum if you're still running stockers. Good luck Joe.
Did you get a polished one?? Thought about a aftercooler?
I will be runing
42 #ers
80 Pro M
255 intank
inline pump
10 psi
Custom burned chip for the original owner of this set up. (qball from the Corral)
powerpipe.
My ingtion system is 100% stock thus far.
42 #ers
80 Pro M
255 intank
inline pump
10 psi
Custom burned chip for the original owner of this set up. (qball from the Corral)
powerpipe.
My ingtion system is 100% stock thus far.
