What happens when one turbo doesn't work on a twins set up?
#1
What happens when one turbo doesn't work on a twins set up?
Put in my latest 5.3. Scanned it with Hptuners. No error codes, nothing comeing up weird. Go to drive the car and it won't go into boost. I can hear the turbo whistling but can't get it above 3k or so. One of my turbo's has a little more play than normal and has some oil coming out the exhaust turbine. I think it has a bad seal. However, I can still see the compressor wheel turning so figure it should at the very least be working. If oil is coming out of the turbo exhaust then is the turbo causing it to fight the other new turbo?
I am pulling the turbo to send it in but am trying to figure out if something else is going on with this engine. I checked all the connections to the turbos (silicone) and the intake, etc.. Nothing loose or leaking. Car runs fine just won't go above 3k or get into boost.
Any ideas?
I am pulling the turbo to send it in but am trying to figure out if something else is going on with this engine. I checked all the connections to the turbos (silicone) and the intake, etc.. Nothing loose or leaking. Car runs fine just won't go above 3k or get into boost.
Any ideas?
#4
9 Second Club
Put in my latest 5.3. Scanned it with Hptuners. No error codes, nothing comeing up weird. Go to drive the car and it won't go into boost. I can hear the turbo whistling but can't get it above 3k or so. One of my turbo's has a little more play than normal and has some oil coming out the exhaust turbine. I think it has a bad seal. However, I can still see the compressor wheel turning so figure it should at the very least be working. If oil is coming out of the turbo exhaust then is the turbo causing it to fight the other new turbo?
I am pulling the turbo to send it in but am trying to figure out if something else is going on with this engine. I checked all the connections to the turbos (silicone) and the intake, etc.. Nothing loose or leaking. Car runs fine just won't go above 3k or get into boost.
Any ideas?
I am pulling the turbo to send it in but am trying to figure out if something else is going on with this engine. I checked all the connections to the turbos (silicone) and the intake, etc.. Nothing loose or leaking. Car runs fine just won't go above 3k or get into boost.
Any ideas?
A little bit of play or oil whilst not ideal, shouldnt have any major impact on performance until it actually goes bang
#6
The tune is the same tune I had and it went to 23lbs easy. I swapped valve springs so it's not the springs. Hmmm.
#7
I am at a loss. Just drove it again. Won't build more than a couple pounds of boost even if you floor it and the car just does nothing. However, the temp went from 160-200 degrees pretty quickly from trying to get on it. It takes for ever to warm up and runs very cool with the E85 but as soon as you try to romp on it and the engine doesn't respond, it wants to get really hot, ie,. over 200 degrees.
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#8
9 Second Club
Well that should give you w/g pressure only, which could be pretty low ( usually just under spring pressure )
So exactly what does happen at 3k ? Has it ever been tuned at different boost levels ?
Have you checked for leaks on the boost plumbing ? BOV ?
So exactly what does happen at 3k ? Has it ever been tuned at different boost levels ?
Have you checked for leaks on the boost plumbing ? BOV ?
#9
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I am at a loss. Just drove it again. Won't build more than a couple pounds of boost even if you floor it and the car just does nothing. However, the temp went from 160-200 degrees pretty quickly from trying to get on it. It takes for ever to warm up and runs very cool with the E85 but as soon as you try to romp on it and the engine doesn't respond, it wants to get really hot, ie,. over 200 degrees.
#10
9 Second Club
Something is very badly wrong. It could be a tuning issue or as above a head gasket issue.
Although even if the HG was blown, you should still rev and make boost.
A lot more information is needed here.
Has this engine ever run properly ?
Although even if the HG was blown, you should still rev and make boost.
A lot more information is needed here.
Has this engine ever run properly ?
#12
Yes, I went and saw the engine run. It was in a 2000 silverado. I checked oil pressure, and asked to let it run for 10 minutes or so, so I could validate that the engine didn't lose oil pressure or overheat. Once I saw everything was good, they pulled it and loaded it up in the back of my truck.
I took it home, put on a new set of LS9 head gaskests, my head studs, and swapped the valve springs from my old engine to this one. I had those set at the machine shop. They are patriot golds.
Is it possible that somehow when the last engine blew that my pcm somehow went into "limp" mode or something? Car drives fine until around 3k. It is just really weird. I can hear the turbo's whistling but won't build boost and just won't do anything when you floor it. I couldn't imagine the head gaskets are blown because it has only been driven twice, and it over heats after you try and floor it and the car won't do anything. As soon as it does, I shut it off and let it cool back down with the fan. Again, it won't over heat at all if I don't attempt to floor it or get it into boost. You can drive it anywhere with the temp at 160 degrees as long as you don't jump on it. As soon as you try to romp on it, about 10-15 seconds later the temp guage shoots up to around 210.
I am going to see if I can scan it and see what happens when I try to stomp it and see if something is happening with the pcm when you romp it.
It does not have a maf sensor. It is a SD open loop tune with a 2 bar map.
I took it home, put on a new set of LS9 head gaskests, my head studs, and swapped the valve springs from my old engine to this one. I had those set at the machine shop. They are patriot golds.
Is it possible that somehow when the last engine blew that my pcm somehow went into "limp" mode or something? Car drives fine until around 3k. It is just really weird. I can hear the turbo's whistling but won't build boost and just won't do anything when you floor it. I couldn't imagine the head gaskets are blown because it has only been driven twice, and it over heats after you try and floor it and the car won't do anything. As soon as it does, I shut it off and let it cool back down with the fan. Again, it won't over heat at all if I don't attempt to floor it or get it into boost. You can drive it anywhere with the temp at 160 degrees as long as you don't jump on it. As soon as you try to romp on it, about 10-15 seconds later the temp guage shoots up to around 210.
I am going to see if I can scan it and see what happens when I try to stomp it and see if something is happening with the pcm when you romp it.
It does not have a maf sensor. It is a SD open loop tune with a 2 bar map.
#16
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sounds like a wastegate hung open(maybe a piece of piston stuck in it), exhaust stopped up, loose compressor wheel, intercooler too small or a restriction before the throttle body of some sort. too much fuel, not enough fuel, mass air flow is set to trip at the wrong frequency and wont fail, or you turned the mass air flow to no error reported. 2 step is hung up. if your using an injector driver i would check that too by looking at your AFRs compared to your injector duty cycle. check your trans for any issues...(although that would prolly make it boost easy just not go anywhere)...
to be real honest... it sounds like the cam is off a tooth....
also try a crank relearn.... just for good measure.
to be real honest... it sounds like the cam is off a tooth....
also try a crank relearn.... just for good measure.
Last edited by 6.0mustang; 08-30-2012 at 11:35 PM.
#20
9 Second Club
No harm but if the temperature is rising like that, the problem has **** all to do with any turbochargers.
There is a major problem elsewhere. Either with the ecu/tuning, or internally with the engine.
There is a major problem elsewhere. Either with the ecu/tuning, or internally with the engine.