2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

Blew my intake manifold on the dyno today, cant make more than 11 psi

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Old 05-24-2008 | 10:37 PM
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Post Blew my intake manifold on the dyno today, cant make more than 11 psi

Im not sure what exactly failed but i have a loud hissing sound coming from my intake manifold. sprayed the top of the manifold with choke cleaner and it was sucked right thru the top. Anyone know of aftermarket replacement gaskets for the intake manifold or a replacement manifold or why mine failed when i havent known any to fail as far as i know.

Got the 60# injectors in. those are in and tuned fine. Got the 3 inch zzp downpipe on as well. The turbo wastegate on my gt2860rs is fully turned up and maxed out and i can only build 11 psi. I thought i could pull 300whp on a mustang dyno but the best i could pull is: 245 whp and 256 wtq. i hope more after the manifold fix maybe i can make more.

Anyone have any input?
Old 05-24-2008 | 10:41 PM
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what boost were you planning on making 300 with?
Old 05-24-2008 | 10:42 PM
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The manifold should handle a shitload of boost just fine, just not the gaskets
Old 05-24-2008 | 10:50 PM
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I was planning on making the 300whp with 13-14 psi. The boost testing done shows 13 psi before the intercooler and 11 psi after the intercooler. That seems to be within limits of efficiency but i thought my turbo had alot more left in it to be maxed out so soon. No boost leaks can be found other than my intake manifold gasket it seems but im not sure until we get it off. I dont think the leaky manifold is stopping the psi though so i have no clue why the boost isnt there with the current turbo.

Originally Posted by HackAbuse
The manifold should handle a shitload of boost just fine, just not the gaskets
What am i suppossed to do then? if i put stock gaskets back in then would the same issue arise again later on?

Last edited by celicacobalt; 05-24-2008 at 10:50 PM. Reason: Automerged Doublepost
Old 05-24-2008 | 10:53 PM
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seems a little optimistic for a mustang dyno
Old 05-24-2008 | 10:53 PM
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Originally Posted by celicacobalt
I was planning on making the 300whp with 13-14 psi. The boost testing done shows 13 psi before the intercooler and 11 psi after the intercooler. That seems to be within limits of efficiency but i thought my turbo had alot more left in it to be maxed out so soon. No boost leaks can be found other than my intake manifold gasket it seems but im not sure until we get it off. I dont think the leaky manifold is stopping the psi though so i have no clue why the boost isnt there with the current turbo.



What am i suppossed to do then? if i put stock gaskets back in then would the same issue arise again later on?
Try the stock gaskets then tighten the manifold more.
Old 05-24-2008 | 10:53 PM
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I know, but gotta go for it anyway and at least try.
Old 05-24-2008 | 10:53 PM
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you ignored your laptop going danger to the manifold didnt you? At least your floored stayed in. Sorry. You had to expect that. So you blew an intake mani gasket i take it? Odd.
Old 05-24-2008 | 10:55 PM
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Originally Posted by Dead Zen
you ignored your laptop going danger to the manifold didnt you? At least your floored stayed in. Sorry. You had to expect that. So you blew an intake mani gasket i take it? Odd.
As pissed off as i was that it blew i laughed and thought the same thing ha ha!
Old 05-24-2008 | 11:15 PM
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Originally Posted by lsjwannabe
seems a little optimistic for a mustang dyno
IF it's the same mustang dyno where he had his pulls and tuning done before, it's not unrealistic. Not sure what the inputs are they give it, but that shop's mustang dyno puts down numbers that you'd normally see on a dynojet.
Old 05-24-2008 | 11:18 PM
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hmmm.... intersting
Old 05-24-2008 | 11:18 PM
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Originally Posted by celicacobalt
Im not sure what exactly failed but i have a loud hissing sound coming from my intake manifold. sprayed the top of the manifold with choke cleaner and it was sucked right thru the top. Anyone know of aftermarket replacement gaskets for the intake manifold or a replacement manifold or why mine failed when i havent known any to fail as far as i know.

Got the 60# injectors in. those are in and tuned fine. Got the 3 inch zzp downpipe on as well. The turbo wastegate on my gt2860rs is fully turned up and maxed out and i can only build 11 psi. I thought i could pull 300whp on a mustang dyno but the best i could pull is: 245 whp and 256 wtq. i hope more after the manifold fix maybe i can make more.

Anyone have any input?
saab 9-5 manifold is cast i believe...basically a direct replacement and it fits, just not sure about the throttle body....hell even the new tcss manifold would work
Old 05-24-2008 | 11:33 PM
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buwhahaha.

14psi on a 30lb/min a compressor.....and you think you'll hit 300.

not a chance in hell.

heres how the numbers line up thus far.

your at a PR of about ~1.5 (a bit less then)

that PR at a MAX flow on a 28RS is about 30lb/min (428CFM) that airflow supports about 285hp.

factor in you smaller boost numbers and drive train loss, and your left with your 250ish mark.

time to open your eyes if you want 300.

as for your intake manifold, did it blow or was it the gasket?

the manifold its self has been tested, validated, and used at MUCH higher boost numbers.
Old 05-24-2008 | 11:51 PM
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Originally Posted by 06black
buwhahaha.

14psi on a 30lb/min a compressor.....and you think you'll hit 300.

not a chance in hell.

heres how the numbers line up thus far.

your at a PR of about ~1.5 (a bit less then)

that PR at a MAX flow on a 28RS is about 30lb/min (428CFM) that airflow supports about 285hp.

factor in you smaller boost numbers and drive train loss, and your left with your 250ish mark.

time to open your eyes if you want 300.

as for your intake manifold, did it blow or was it the gasket?

the manifold its self has been tested, validated, and used at MUCH higher boost numbers.
too early to tell exactly what part of the manifold is blown. im hoping its just a gasket, but then again if i put another stock gasket in what will the outcome be? Also on the turbo i have now i thought it was good to support 320hp from garretts site? Im still learning too but i thought if a turbo was good to 320 then it shouls make 300whp. oh well.

Originally Posted by mike25
saab 9-5 manifold is cast i believe...basically a direct replacement and it fits, just not sure about the throttle body....hell even the new tcss manifold would work
has anyone we know on here used the manifold with success?

Last edited by celicacobalt; 05-24-2008 at 11:51 PM. Reason: Automerged Doublepost
Old 05-25-2008 | 12:05 AM
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i had the same thing going on it turned out to be one of my injectors the oring was shot .. when i fixed it the noise went away ,, but b4 that i swapped out my intake manifolds and keep hearing it that finally found it was the ijectors
Old 05-25-2008 | 12:28 AM
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Originally Posted by celicacobalt
too early to tell exactly what part of the manifold is blown. im hoping its just a gasket, but then again if i put another stock gasket in what will the outcome be? Also on the turbo i have now i thought it was good to support 320hp from garretts site? Im still learning too but i thought if a turbo was good to 320 then it shouls make 300whp. oh well.



has anyone we know on here used the manifold with success?
the stock gasket held strong on my car well past 25psi. so its plenty strong, pop a new OEM piece on there.

and what the turbo is good for relies on proper PR and set up.

if you want 300+ on such a small turbo, your gonna have to crank the boost to get the air flow.
Old 05-25-2008 | 07:28 AM
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Originally Posted by celicacobalt
too early to tell exactly what part of the manifold is blown. im hoping its just a gasket, but then again if i put another stock gasket in what will the outcome be? Also on the turbo i have now i thought it was good to support 320hp from garretts site? Im still learning too but i thought if a turbo was good to 320 then it shouls make 300whp. oh well.



has anyone we know on here used the manifold with success?
i know one of the ss/sc goes who were doing a turbo swap was going to use it....i think it might have been jimbosss
Old 05-25-2008 | 07:50 AM
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I know it sounds like the common sense solution, but have you called Bill yet? He may be able to shoot you some advice.
Old 05-25-2008 | 08:10 AM
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I sent bill an email.

So i guess i have no upgrades for this part and have to hope a new stock one will hold.
Old 05-25-2008 | 11:37 AM
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You have to spray NOS in order to have your floor pan fall off and your hidden washer compartment start leaking washers.
Old 05-25-2008 | 01:28 PM
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Originally Posted by celicacobalt
I sent bill an email.

So i guess i have no upgrades for this part and have to hope a new stock one will hold.
That's why I recommended you call Bill.. though it is pricey, he says its good to 600 hp.

http://www.turbosystem.com/ProjectVe...baltintake.htm
Old 05-25-2008 | 08:32 PM
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the 2.4L manifold on the solstice / sky has been pushed FARRR harder then your week ass 14psi.

get a new one and forget....the all powerful bill (huge sarcasum) will attest to that fact.
Old 05-25-2008 | 08:57 PM
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Originally Posted by 06black
the 2.4L manifold on the solstice / sky has been pushed FARRR harder then your week ass 14psi.

get a new one and forget....the all powerful bill (huge sarcasum) will attest to that fact.
yep...i believe ive seen it pushed to like 22psi befor it blew
Old 05-25-2008 | 10:01 PM
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its just odd mine blew at such low power levels in comparison to whats been pushed before.
Old 05-25-2008 | 10:02 PM
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Originally Posted by celicacobalt
its just odd mine blew at such low power levels in comparison to whats been pushed before.
parts fail..thats normal in the automotive world


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