how much boost on stock internals?

S

stangster8

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I know quite a bit about fuel management and proper setup for the most part. What I want to know is, assuming a proper setup, how much boost from a powerdyne supercharger can a 95 mustang gt handle on the stock internals? Thanks.

 

281pony

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#2

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done a compression check? there is alot of variables, assuming you have a reliable engine for it and a safe tune.

i have seen people running 12-15 pounds on a stock shortblock. then usually the block becomes the weak point.

 

94GTLaserRC

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#3

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• #3

The question is "how much boost can a powerdyne make on a stock block"

Seriously, 8-10 is the "going rate" that matches safety and enjoyment. Mainly the concern is "how much" or "how often" you get on it. Mine has "seen" 12-14 # of boost, but in my daily driving, I rarely give it more than 5-6 # when accelerating on the ramps or at traffic lights.

RC

 

94GTLaserRC

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OH...BTW.

<marquee>W...E...L...C...O...M....E To Stanget!! </marquee>
RC

 

VibrantRedGT

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I doubt your Powerdyne will put enough boost in the block to do damage. Unless you have the DB version. The stock internals are decent but if you must know 14 psi out of an S-trim tore some rings up in my block.

 

Venom351R

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It varies from Car to Car but the common rule of thumb is 10 PSI as stated before. Just b/c you go over 10 on a few occasions does not mean your motor will blow up. I have a friend that as seen 15 PSI on his turbo stang. Now if he ran 15 PSI on the street and got into it all the time then his motor would eventually go. 10 Is pretty much the safe zone where you can still have fun w/ it on a reg basis and not have to worry about much as long as its tuned right. The tune is the most important factor.

 

Joes95GT

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#7

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94GTLaserRC said:

The question is "how much boost can a powerdyne make on a stock block"

RC

Click to expand...

LOL. That is very funny.

Joe

 

YEAHLOH95

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my car has seen 15lbs about 6 times on the dyno and 8-10lbs the last time i had it at the track, if you have good tune 10-12lbs should not be a problem.just make sure you run the best gas you can i run 100 oct on occation just to be safe .

 

Rootus

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It doesn't seem to me that boost is the proper measurement here. Everybody has a different combo, so 10 psi means something different to each of them. I think if you want to guess how much the motor can take, it would be measured in horsepower.

For what its worth I know of someone who ran 18-19 psi for a couple of years. But that was a stock longblock, so it was probably similar to what YEAHLOH95 gets with his setup at 10 psi.

Dave

 

M

mackey

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#10

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The pistons can hold ALOT of boost. The problem with the pistons is they will not hold the detonation. Theoretically you could run 20psi on the stock pistons if you had a good tune and in a different and updated block. The block is the weakpoint of the 87-95 302

 

94GTLaserRC

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Joes95GT said:

LOL. That is very funny.

Joe

Click to expand...

After seeing this thing on Javi and Roger's car, I couldnt resist that comment
RC

 

I

igotyofire

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#12

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mackey said:

The pistons can hold ALOT of boost. The problem with the pistons is they will not hold the detonation. Theoretically you could run 20psi on the stock pistons if you had a good tune and in a different and updated block. The block is the weakpoint of the 87-95 302

Click to expand...

And the pistons are all the same over the years?

 

rio95

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#13

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I wouldn't go over 12psi with a blower and 10psi with a turbo, unless I really didn't care if I blew my motor. The rule of thunb is usually 10psi.

 

M

mackey

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igotyofire said:

And the pistons are all the same over the years?

Click to expand...

No I am talking about the blocks being the same. 87-92 were Forged and 93-95 are hypereuretic (sp?).

 

Rootus

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mackey said:

hypereuretic (sp?).

Click to expand...

Hypereutectic, since you asked .

 

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igotyofire

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Rootus said:

Hypereutectic, since you asked .

Click to expand...

why did that do that, cheaper? so that means theyre not as strong?

 

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Jack's95gt

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#17

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I ran a 2.6" pulley with my Powerdyne. It produces 12 lbs just under the rev limiter setting. I'm changing to a 2.93" pulley for next year which should give me 9 lbs. I was lucky and only blew a head gasket at the track in October. I would also say 10 lbs max would be safe.

 

Rootus

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igotyofire said:

why did that do that, cheaper? so that means theyre not as strong?

Click to expand...

I don't think price was the deciding factor. The upside to hypereutectic pistons is they do not expand much when heated -- so they can be very tight when the engine is cold, eliminating piston slap on cold startup, as well as blue smoke. Both of which tend to cause customers to complain. It is much the same reasoning they use for the non-functional oil pressure gauge.

As for strength, they are quite strong, but more brittle than forged, so slightly more susceptible to damage for detonation (although detonation will kill any piston dead). Even some factory boosted motors come with hypereutectic cast pistons (WRX, STi, Supra).

Dave