4T80E/Turbo-S/C... TIME FOR A NEW THREAD?
#263
Senior Member
Posts like a Turbo
Thread Starter
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by radomirthegreat
Are the innards of the turbo still good? Also, are there listings for OE oil pipe sizes?
I am going to pull the turbo and see what'* up with it. I'll report back later........
#264
Senior Member
Posts like a Turbo
Thread Starter
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Likes: 0
Received 0 Likes
on
0 Posts
Well, since I plugged the pcv holes and made no other provisions, I am hoping crankcase pressure was to blame for insufficient oil return. I put the pcv in the oil cap (drilled a 1" hole, used a grommet and stuffed some foam in the cavity to filter oil splash) and the turbo now spins free even with no intercooler to t/b pipe. Before, the turbo turned real sluggish if at all. There is a definate change in alot of things with the pcv hooked up. I still have alot of smoke, but I am hoping it'* just oil in the pipes. Since i am running really lean, the idle is really high. I am programming right now back to the stock MAF tables to hopefully rectify the lean situation (I have not made a jumper harness yet for the MAF to the remote LS1 MAF and I had already put the LS1 MAF tables in the program)
Once that is done, I will let the engine idle for a while and hopefully clear out the pipes and have no more oil passing the turbo. I shimmed the oil pump pressure regulator spring so I have about 80psi cold idle. I thought maybe that was too much oil to the turbo, but I have run over 100psi in racing turboi applications and never had a drain issue like this. I disconnected the oil feed and put a guage in the line, partly so I could run it and also to see the pressure. Before I fixed the pcv, oil actually bubbled UP AND OUT the top of the turbo oil inlet!!!! Definately a problem there! After I hooked up the pcv, that didn;t happen anymore. So, I think it'* fixed........
Once that is done, I will let the engine idle for a while and hopefully clear out the pipes and have no more oil passing the turbo. I shimmed the oil pump pressure regulator spring so I have about 80psi cold idle. I thought maybe that was too much oil to the turbo, but I have run over 100psi in racing turboi applications and never had a drain issue like this. I disconnected the oil feed and put a guage in the line, partly so I could run it and also to see the pressure. Before I fixed the pcv, oil actually bubbled UP AND OUT the top of the turbo oil inlet!!!! Definately a problem there! After I hooked up the pcv, that didn;t happen anymore. So, I think it'* fixed........
#265
Senior Member
Posts like a Northstar
Join Date: Apr 2007
Location: Edinboro, PA
Posts: 567
Likes: 0
Received 0 Likes
on
0 Posts
Yeah so I am a sophomore in Mechanical Engineering at Penn State University and I would like to say you are pretty much my hero lol. :P
#266
Senior Member
Posts like a Turbo
Thread Starter
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by jbmark33
Yeah so I am a sophomore in Mechanical Engineering at Penn State University and I would like to say you are pretty much my hero lol. :P
Thanks, though. I appreciate it.
The turbo appears to be a problem. It is still leaking oil. I can't get the engine to idle down, I think I still have a vacuum leak somewhere. Soon the i/c is coming off and the */c going on by itself and screw the turbo... this is really pissing me off, bad.
The engine was incredibly lean on the 65# injector program, like 20:1, but it will idle around 900rpm. I put in the stock fuel inj rate and it runs 14.5-15.0:1 at idle, but at that a/f, it idles at 3000rpm.
And tomorrow I start my third day of jury duty B.*. I think this is NOT what the founding fathers had in mind for jury selection. Sitting around all day being weeded-out by the attorneys.
#267
Senior Member
Posts like a Northstar
Join Date: Apr 2007
Location: Edinboro, PA
Posts: 567
Likes: 0
Received 0 Likes
on
0 Posts
What modifications did you do to be able to run the intercooler below the supercharger?
Because you may want to try bolting the supercharger straight up and see if you still have a vacuum leak. I know the wood is hard wood and was kiln dried, but there'* something fishy about that intercooler that just some how rubs me the wrong way.
Because you may want to try bolting the supercharger straight up and see if you still have a vacuum leak. I know the wood is hard wood and was kiln dried, but there'* something fishy about that intercooler that just some how rubs me the wrong way.
#269
Senior Member
Posts like a Turbo
Thread Starter
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by jbmark33
What modifications did you do to be able to run the intercooler below the supercharger?
Because you may want to try bolting the supercharger straight up and see if you still have a vacuum leak. I know the wood is hard wood and was kiln dried, but there'* something fishy about that intercooler that just some how rubs me the wrong way.
Because you may want to try bolting the supercharger straight up and see if you still have a vacuum leak. I know the wood is hard wood and was kiln dried, but there'* something fishy about that intercooler that just some how rubs me the wrong way.
#270
Senior Member
Posts like a Northstar
Join Date: Apr 2007
Location: Edinboro, PA
Posts: 567
Likes: 0
Received 0 Likes
on
0 Posts
Usually when the IAC solenoid goes bad, it won't ever idle down, like it gets stuck at the highest throttle position last pressed. So, maybe you're right, simple as that.