how much boost on a stock 5.0 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 27 Old 07-18-2012, 07:21 PM Thread Starter
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how much boost on a stock 5.0

Ive got my twin turbo set up running and have tuned it for regular driving/crusing. Its time to get it on the dyno. I have 3psi springs in my gates so 6 psi should be what i am going to see to start. My combo is twin billet 6262, vic jr intake with custom elbow and 90mm tb. I am also running E85. My motor is COMPLETLY stock except intake manifold. So stock headgaskets and bolts from 1989 with 165k miles. Will it handle the 6psi without blowing headgaskets? What kind of boost do people run on stock headgaskets?

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post #2 of 27 Old 07-18-2012, 09:27 PM
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6 psi should be fine if your motor is healthy. FYI tho, you don't add pressures together in a twin setup. If you're running 3psi springs in your wastegates, the car will run around 3 psi if not also running a manual boost controller. It's a common misconception for people to think that twin setups run that way, but they don't.


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post #3 of 27 Old 07-19-2012, 09:43 AM
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You should just plan on replacing the head gaskets and studding it in the near future. Most people, myself included, have had the stock head gaskets let go shortly after them seeing boost.

1989 5.0 T5 LX Hatch - Explorer Short Block with an FMS F-303 cam, TFS TW170 heads, Tmoss Ported Cobra Intake, an On3 Turbo Kit with a 67mm Ceramic Ball Bearing Turbo, and backed by a T56 Magnum 6spd with 3.55's
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post #4 of 27 Old 07-19-2012, 12:32 PM
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yep, stock bolt are no good for boost. even stock replacement head gasket should last a good while if you put sutd. tuning help a lot too...
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post #5 of 27 Old 07-19-2012, 01:14 PM
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TWO WORDS: Rev limiter!
I've been running my stock motor hard with 10psi for about a year now and it's still tickin.

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post #6 of 27 Old 07-19-2012, 01:33 PM
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Quote:
Originally Posted by Project Ron Burgundy View Post
TWO WORDS: Rev limiter!
I've been running my stock motor hard with 10psi for about a year now and it's still tickin.


Same here, 10psi on stock motor with rev limit at 5200. Its RPM's and detonation (from a bad tune or poor fuel system) that destroy boosted stock motors.

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post #7 of 27 Old 07-19-2012, 03:33 PM
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I would be very leary, twin billet 62s have jaw dropping capabilities.

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post #8 of 27 Old 07-19-2012, 06:29 PM Thread Starter
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i was thinking about trying to put studs in 1 at a time with the heads still on the car or jsut wait till the head gaskets blow and build a new motor with a good block
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post #9 of 27 Old 07-19-2012, 10:11 PM
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Only 5200 RPM? Mine is set at 5800

Stock block, GT40 heads, Explorer intake, 67mm, 10lbs, 431HP 497TQ on 110 octane. 12.01 @ 123
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post #10 of 27 Old 07-19-2012, 10:43 PM
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Ok head studs 1 at a time guy, hell to the no!!! Im not trying to be a jerk but thats a big no no. It will relieve the pressure and let the gaskets decompress and then it will get ugly quick. Not to mention you run the risk of warping a head or the deckk itself. Wait until you have the tme or money or whatever and do it correctly gaskets and studs at the same time. And op twin billet wheeled 62`s? One of those will let your stock junk release the factory smoke. A little overkill imo but i do like overkill. Do let us know how it turns out!


I'm not a magazine racer, my car is actually fast.
I also have a Honda civic but, mine has a bigger, uglier driver.
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post #11 of 27 Old 07-20-2012, 12:46 AM
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the headgaskets should have a good seal since the motor has never been opened.
E85 and a safe tune with low rpms will help it last a little longer.
Twin billet 62s is WAY overkill for a stock block, I like it!!

12.7s motor, 11.7s spray, turbo 400/460. [email protected]
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post #12 of 27 Old 07-20-2012, 07:36 PM Thread Starter
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well i am planning on building a new motor I was just using this one to get it running.
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post #13 of 27 Old 07-21-2012, 02:05 AM
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Looking good!
when you get the new motor build started you can find out how much boost it will take. LOL
or be like most of us and find out and have a reason to build another one

12.7s motor, 11.7s spray, turbo 400/460. [email protected]
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post #14 of 27 Old 07-21-2012, 08:49 PM
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You coming out and cruising tonight? If so I'll see you at O'Reillys.

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post #15 of 27 Old 07-23-2012, 01:17 PM
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We've ran stock motors at 12psi pretty successfully, a nasty WOT third powershift turned it into a bug truck, though.

The same motor ( 97 mountaineer) with an F-cam 1 stock head gasket one 9333pt1 because a bolt broke off in the head and we had to pull it to fix held 17psi for a good 3 months before it let go but it did in great fashion, once again a real hard power shift and it blew 3 cylinders on both sides


worst one though, wastegate line melted.... car was getting sideways in 3rd and 4th gear we were loving it.... look at boost gauge and saw 24.... that one blew all 8, hahah but amazingly still pulled like a son of a bitch even with the head gasket gone.

I'd say 9-10 PSI would be completely safe.... I've heard E7s can hold a bit more boost than GT40ps as well.

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post #16 of 27 Old 07-25-2012, 07:34 PM Thread Starter
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muchos, my car is getting painted so I couldnt cruise it and i need to fab some braces for the turbos. Im just woundering what to limit my boost to with stock head gaskets and head bolts.
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post #17 of 27 Old 07-26-2012, 07:40 PM
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I did an install a couple years on a stock 95. It was great till it hit 10lbs. Lifted the head and sprayed coolant over and underneath the master cyl.

Pulled the heads and went with 1011-1 Fel Pro's and a set of ARP head bolts. ran it at 14lbs for 2 1/2 years till a hyperpathetic piston finally broke a ringland.

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post #18 of 27 Old 07-26-2012, 08:41 PM Thread Starter
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i guess ill keep it under 10psi and hope they hold up for a while till I feel like changing them out
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post #19 of 27 Old 07-26-2012, 10:43 PM
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Im daily driving mine at 12 pounds of boost with arp head studs.

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post #20 of 27 Old 07-27-2012, 12:05 AM
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Im daily driving mine at 12 pounds of boost with arp head studs.
What kind of power is it putting down? I'm guessing it isn't a R block either?

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post #21 of 27 Old 07-27-2012, 05:26 PM
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What kind of power is it putting down? I'm guessing it isn't a R block either?
Its a stock 302 block, stock bottom ect. h/c/i car. 450 to the wheels on pump gas at the dyno with the timing at 16 on the safe side. Then for the track i bump the timing to 19 and just add race gas just to be on the safe side im guessing 475 to the wheels, could be more idk.

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post #22 of 27 Old 07-29-2012, 12:31 AM
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Its a stock 302 block, stock bottom ect. h/c/i car. 450 to the wheels on pump gas at the dyno with the timing at 16 on the safe side. Then for the track i bump the timing to 19 and just add race gas just to be on the safe side im guessing 475 to the wheels, could be more idk.
This is what I wanna put down with mine after I boost it. 10-12psi on a motor built for low boost. I think it should hold that pretty well. Is 475hp in the block cracking range, or is it mainly over 500hp?
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post #23 of 27 Old 07-29-2012, 12:53 AM
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Only making 400hp/400lbs/ft at the wheels and this happened. Tune was solid.

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post #24 of 27 Old 07-29-2012, 03:23 AM
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This is what I wanna put down with mine after I boost it. 10-12psi on a motor built for low boost. I think it should hold that pretty well. Is 475hp in the block cracking range, or is it mainly over 500hp?
You will hear estimates all over the power range, to be honest a lot of things factor in. You can break the block at 300hp or at 600, a day or 3 years. I've heard of a stock 302 based block making 800rwhp for an entire season before letting go, also heard of some splitting the block with 330rwhp.

Tune and RPM matter as much as the power imo.

92 GT Hatch - GT40P, F303, Headers, H-Pipe, 3:55s etc.
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post #25 of 27 Old 07-29-2012, 06:11 AM
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Only making 400hp/400lbs/ft at the wheels and this happened. Tune was solid.

400 through a T5 or 400 through a C4 with a 5000 stall? Define "solid tune"? Over revved? Hit rev limiter? Put on 2 step too many times? Junk balancer? Slipped balancer?

Many possible causes to consider
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post #26 of 27 Old 07-29-2012, 07:12 AM
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Car has only 20k in it. Motor was built by Steve Grebeck. A/F ratio were recently checked about this time last year just to be sure it was still good with the 10% ethanol pump gas has these days. Failure happened during a Sunday spirited drive, but nothing crazy.

The car has 3.08 grears and is more of a road car than a drag car.
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post #27 of 27 Old 07-29-2012, 11:28 AM
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I have been running my motor a little over a year....Been running the heck out of it. Went through my share of head gaskets last year even with head studs...Was a bad tune...Tune good now have ran as high as 16psi going through the traps with total timing at 17 only reving to 5800. I know its on borrowed time but that's why I have a spare on the floor.

95gt Dart block 363, TEA 205 Heads. 78MM Turdblower Custom cam, All fab work done by me....Moates tuned by me, AODE done up, yep I got overdrive. Drag radials, 327 rear. Next setup to come over winter...lol

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