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Old 11-11-2007, 06:45 PM   #1 (permalink)
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Ford 5.0, opinions on boost reliability

I have a 96 5.0 gt40head engine. I have a friend selling a twin turbo 91 stang. he wrecked it and I can get the hard parts cheepo... He runs 12lbs on 42lb/hr injectors. Is this safe on an otherwise stock 96 5.0?
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Old 11-11-2007, 06:50 PM   #2 (permalink)
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You might want to check, but I don't think the manifolds will fit the GT40 heads (I *think* there were sparkplug interference issues IIRC). Otherwise, I don't see any reason the motor wouldn't be able to handle it provided it had a good tune.
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Old 11-11-2007, 07:01 PM   #3 (permalink)
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GT40P heads use a different plug angle that causes header clearance issues. Your buddy with the turbo system is pushing his luck if he is running a stock block. 550 rwhp is about the max for a stock block, most stockers will look like this 2 piece block http://www.mrnitrous.com/Broken.jpg with too much boost/hp
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Old 11-11-2007, 07:07 PM   #4 (permalink)
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I can tell you matter of fact that not all of them will end up splitting the block. I know a guy who was making ~650 WHP on a stock shortblock for a good while before he finally detonated it and killed it. Yes, you may be taking some chances when you near the 550 hp mark, but it is not necessarily a definite thing that you will have problems with. Keep it semi mild and there shouldn't be any problems with it.
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Old 11-11-2007, 10:02 PM   #5 (permalink)
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Well, 12 psi and a stock block aren't exactly semi mild in my book . Even a "safe" tune with 12 psi is pushing your luck, and I too know people who make more than 550 rwhp, but they don't for long on a stock block.
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Old 11-11-2007, 10:44 PM   #6 (permalink)
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he said his combo only makes aout 410 RWHP.
Is that not equal to what 12 psi of boost should make?
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Old 11-11-2007, 10:46 PM   #7 (permalink)
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Quote:
Originally Posted by BlueOvalRacing View Post
GT40P heads use a different plug angle that causes header clearance issues. Your buddy with the turbo system is pushing his luck if he is running a stock block. 550 rwhp is about the max for a stock block, most stockers will look like this 2 piece block http://www.mrnitrous.com/Broken.jpg with too much boost/hp
my 96 is a gt40 no p are the plug angles different?
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Old 11-11-2007, 11:30 PM   #8 (permalink)
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Quote:
Originally Posted by Munchies View Post
he said his combo only makes aout 410 RWHP.
Is that not equal to what 12 psi of boost should make?
sounds low...

and 12 psi on a factory block sounds like someone is pushing his luck.
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Old 11-12-2007, 05:56 AM   #9 (permalink)
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Quote:
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he said his combo only makes aout 410 RWHP.
Is that not equal to what 12 psi of boost should make?
It should make quite a bit more. With 12 psi, it could make over 600 with the right tune.

Quote:
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my 96 is a gt40 no p are the plug angles different?
Yes, your GT40 heads will accept almost any small block header, where the P heads only accept a couple different sets.
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Old 11-12-2007, 07:24 AM   #10 (permalink)
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Did your 96 gt40 motor come out of an explorer or did you build it your self? Question has to do with piston type.
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Old 11-12-2007, 07:59 AM   #11 (permalink)
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Quote:
Originally Posted by Munchies View Post
he said his combo only makes aout 410 RWHP.
Is that not equal to what 12 psi of boost should make?
It depends on what turbos he has on it but it seems low.

Quote:
Originally Posted by BlueOvalRacing View Post
Well, 12 psi and a stock block aren't exactly semi mild in my book . Even a "safe" tune with 12 psi is pushing your luck, and I too know people who make more than 550 rwhp, but they don't for long on a stock block.
Meh, I guess I'm just used to being around a lot of cars that make a lot more hp so it seems pretty mild to me...

I'd be inclined to put it on a stock motor and push my luck but then again that's what I like to do.
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Old 11-12-2007, 08:19 AM   #12 (permalink)
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my 96 is a gt40 no p are the plug angles different?
'96= hypereutectic pistons.

make sure your tune is dead nuts on and invest in cometic head gaskets and ARP head studs. Rattle it and it will shatter a piston or lift a head.
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Old 11-13-2007, 08:35 PM   #13 (permalink)
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I don't think I'd push over 6 PSI on a stock motor. If you had some good ARP's on a stock motor maybe go to 9. But there is no way I'd run 12 on a stocker unless you're selling tickets or planning to post the disaster on you-tube.
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Old 11-14-2007, 07:08 AM   #14 (permalink)
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Hell, just leave it stock. Why sink money into your DD?
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Old 11-14-2007, 02:52 PM   #15 (permalink)
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Quote:
Originally Posted by Munchies View Post
I have a 96 5.0 gt40head engine. I have a friend selling a twin turbo 91 stang...He runs 12lbs on 42lb/hr injectors. Is this safe on an otherwise stock 96 5.0?
Well 'safe' is a relative term. If you go this route, I'd recommend that you get his FMU (he has one...right?). You'll also need to upgrade your stock fuel pump, if you haven't already. I gotta agree with the those that posted 12lbs of boost is alot for a street car. 6-9 and you'll drive 'another' day. 10 and above, ooooh...It feels sooo good...Until ya grenade the motor.

Ya want twin turbo's? Get the stuff from him, and build yourself an engine design to handle them. Start with a World or one of the new Ford Racing Boss blocks.
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Old 11-15-2007, 07:12 PM   #16 (permalink)
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Im sure you can turn the boost down. 8-9psi should be fine. DON'T run an FMU, they can and WILL fail when you least excect it. 42# injectors and a 255lph pump should be good up to 400rwhp. Any decent dynoshop that does ford tuning (SCT is what I use) should be able to give you a nice safe tune with about a 11.5:1 A/F ratio and conservative timing. Hell I run a 11psi Vortech setup on a stock bottom end 3.8L Ford V6 and haven't tossed a cast piston yet with 30,000 miles on the setup and LOTS of abuse.
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Old 11-18-2007, 12:44 AM   #17 (permalink)
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i wouldnt run the 42lb injectors, a little much, some 30's will be alot better off, i run 30's on a mild 302(heads cam intake....) and the 30's are too much(hot start issues) and i could run 24lbers alot more comfortably. 30lbers should be able to support around 500hp, so 42's are overkill and would have to be ran at a really low psi or it would be way too rich(i run 34psi on my 30lbers, it should be around 340horse, ran 13.2@107 spinning through 3rd just for comparison sakes).

i would get an awesome tune, and run an intercooled 9psi all day on the stock motor, should be fun

fyi, there are guys out there running 13psi and making over 400rwhp on BONE STOCK 5.0 mustangs(one guy did a mid 11 at 13psi, completely stock other than fuel system and the turbo setup, even stock throttle body and exhaust)

i cant say how long they will last at 13psi, but i would drive it hard every day with good gas, good tune and 9psi
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Last edited by 84B2; 11-18-2007 at 12:45 AM.
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