PUSHED 15PSI through ATI twins
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PUSHED 15PSI through ATI twins Didn't think it could be done but, I was able to get 15psi out the stock ATI twin intercoolers while tuning the other day on a Mustang Dyno. Hit's 10psi pretty quick then just a steady climb to 15psi at about 6000 rpms. Nothing to get real excited about on the dyno other than I got the A/F dialed in between 12.1-12.3 from 3200-6500 rpms. The power was a modest 505/524 but I ended up with some kinda drivetrain issue (clutch or tranny) during the tuning so I think it was robbing power. Gonna figure that out this week. One big positive was the 'ole 408CI gets to 500 ft/lbs of torque by 4000 rpms.
Another issue came up as well, oil pressure drop
. Then goofy gauge readings (20PSI to 0 PSI then upto 15PSI, always dropping a bit when revving the motor). Anyone have a comment on that, are the GM oil pressure sensors known to go bad or do you think it could be a bigger issue? BTW, The new motor as a new ported oil pump with only about 500 miles on it and the oil level was fine.
Anyway, I know there has been a small debate about what you could push thru the ATI twins so I thought I would pass it along. BTW 3.4" pulley on the SDCE 8-rib.
Mark
Another issue came up as well, oil pressure drop
. Then goofy gauge readings (20PSI to 0 PSI then upto 15PSI, always dropping a bit when revving the motor). Anyone have a comment on that, are the GM oil pressure sensors known to go bad or do you think it could be a bigger issue? BTW, The new motor as a new ported oil pump with only about 500 miles on it and the oil level was fine.Anyway, I know there has been a small debate about what you could push thru the ATI twins so I thought I would pass it along. BTW 3.4" pulley on the SDCE 8-rib.
Mark
Cool, never doubted anyone couldn't push 15psi through them and I was seeing 14psi with the twins and cog set up FWIW. Now put a FMIC on it and see what happens
. Also what term said, check that o ring on the oil pump....they've been known for that exact thing...its also easiest to check....hopefully it isn't a spun bearing:crossesfingers:
J
. Also what term said, check that o ring on the oil pump....they've been known for that exact thing...its also easiest to check....hopefully it isn't a spun bearing:crossesfingers:J
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Originally Posted by frcefed98
Cool, never doubted anyone couldn't push 15psi through them and I was seeing 14psi with the twins and cog set up FWIW. Now put a FMIC on it and see what happens. Also what term said, check that o ring on the oil pump....they've been known for that exact thing...its also easiest to check....hopefully it isn't a spun bearing:crossesfingers:
J
. Also what term said, check that o ring on the oil pump....they've been known for that exact thing...its also easiest to check....hopefully it isn't a spun bearing:crossesfingers:J
There's a guy here in KC with a 92 LX Mustang that has a 4V Cobra motor in it, along with an F1A blower, pushing 24-26psi through a set of twin high-flows. The car makes 650 to the wheels and the IAT's don't get very high at all. The high-flows are not nearly as bad as everyone thinks. The reason he has them on is for grond clearance, as the car is slammed and on an LX there is no room to put a big front mount on it. You can see some pics here: http://www.houseofboost.com/members.jasonk.html
Originally Posted by BlwnTA
Known for what, J? How would you know if you spun a bearing?
PM kyle(na$ty) on how his oil pressure was when he lost a bearing.
J
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Originally Posted by frcefed98
Doh! if you nick the oring in the oil pump you will get low or fluctuating oil pressure readings. As for the spun bearing you will see deminishing oil pressure. The pressure will even be low at high rpms. Drain your oil and look for a lot of "bronze or copper speckles" in it. You might even cut open the filter to look for the metal in there.
PM kyle(na$ty) on how his oil pressure was when he lost a bearing.
J
PM kyle(na$ty) on how his oil pressure was when he lost a bearing.
J
Well the oil pressure up until recently (the dyno), who knows. I'll look into it. I'll check with Kyle as well thanks J.
Mark
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Originally Posted by Ponyhntr
There's a guy here in KC with a 92 LX Mustang that has a 4V Cobra motor in it, along with an F1A blower, pushing 24-26psi through a set of twin high-flows. The car makes 650 to the wheels and the IAT's don't get very high at all. The high-flows are not nearly as bad as everyone thinks. The reason he has them on is for grond clearance, as the car is slammed and on an LX there is no room to put a big front mount on it. You can see some pics here: http://www.houseofboost.com/members.jasonk.html
Originally Posted by eviltwins
They are pretty damn restrictive if it takes 26 pounds of boost to make 650 to the wheels.
I know right.......... thats alot of boost on a some what bigger cubed motor...... for lower HP....
Kyle
Originally Posted by NA$TY-TA
I know right.......... thats alot of boost on a some what bigger cubed motor...... for lower HP....
Kyle
Kyle
Originally Posted by Ponyhntr
Bigger cubed motor?? It's a 281!!! Also, it's BONE STOCK!! All it has is forged internals! NO cams, NO headwork, ect. That's pretty good in my book, for what's done to the car.
FYI Forged internals is NOT considered (BONESTOCK) That is ALOT of Boost to ONLY make 650rwhp.... Yesi know its only a 281.... all we are saying is that the stock twins are restrictive to only make that much Hp with that much boost.
Back on Topic...
Mark,
I dont know if the vibration you are feeling has anything to do with the motor. Id drainthe oil and use a filter cutter..(not a hack saw) and see if you have any gold/copper colored particles in your oil..... if so its a bearing.
Kyle
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Originally Posted by NA$TY-TA
FYI Forged internals is NOT considered (BONESTOCK) That is ALOT of Boost to ONLY make 650rwhp.... Yesi know its only a 281.... all we are saying is that the stock twins are restrictive to only make that much Hp with that much boost.
Back on Topic...
Mark,
I dont know if the vibration you are feeling has anything to do with the motor. Id drainthe oil and use a filter cutter..(not a hack saw) and see if you have any gold/copper colored particles in your oil..... if so its a bearing.
Kyle
Back on Topic...
Mark,
I dont know if the vibration you are feeling has anything to do with the motor. Id drainthe oil and use a filter cutter..(not a hack saw) and see if you have any gold/copper colored particles in your oil..... if so its a bearing.
Kyle
Thanks Kyle, pulled the tranny, clutch etc tonight. I then drained the new oil and proceeded to try and take off the oil pan to get a better look at things. Wrestled with that for a bit then gave up to watch Monday Night football. When I drained the oil, the preliminary results were not good. Saw a few copper flakes. Just want to get the pan off and see whats up.
It will be in the pan if it is...... we saw it in mine right when we pulled it..... wont be hard to spot the copper even covered in oil...... who built the motor?? Pm me if you dont want to post it up....
Kyle
Kyle
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Originally Posted by NA$TY-TA
It will be in the pan if it is...... we saw it in mine right when we pulled it..... wont be hard to spot the copper even covered in oil...... who built the motor?? Pm me if you dont want to post it up....
Kyle
Kyle
Originally Posted by BlwnTA
A local race shop did the block work, Todd (reckless) and I assembled the shortblock. Everything went pretty smooth though. Need to see for sure and if so, which bearing. You would think with the vibration it would be a main bearing. We'll see. Thanks for all your comments and help.
Kyle