Seeking a little more advanced help on my custom 3.8TT project

[xjarayax]

Just to give you an idea of what I'm doing...

Mounting to DSM takeoff T25's and running off each bank of cylinders on my 3.8 V6 Fbody.

As you can see from the first picture the turbos are mounted on each side of the oil pan, as I did not have room to plumb and mount them in the engine bay. Obviously, since the stock turbos are both water and oil cooled gravity drain for the oil will not work- since it's parallel with the oil pan. The device I will use to pull the oil out of the turbos for drain is an oil scavenge pump, but I'm having a hard time finding the right one for my application. The LS1 V8 Fbody TT kit comes with a scavenge pump, but the turbos are larger and support a higher flowrate. Since it's an electric pump, I'm worried that it's going to suck the turbos dry and I'm going to run into problems.

Does anyone have any idea what kind of oil flow rates the stock T25's have? I'm probably going to have to take those specs. and get the pump custom refurbished for that.

My project is moving along quite well I am just having a lot of small problems that I need to iron out.

Help me complete my monster.

 

[nine5raptor]

the pressure differential accross center section should be enough to move the oil, shouldn't it? I would think that the gravity drain actually does very little for the turbo as long as you have a good pressure source for the oil going in. i.e. I think the 2g's rely far less on the gravity drain than the 1g's due to the turbo oil feed.

 

[xjarayax]

I'm just worried about starving the turbos. If I don't have to buy an expensive pump that'd be GREAT! They will only have about a foot or a foot and a half of line to travel to return to the oil pan. If you think that's doable just from the pressure from the center section, even better.

Also...do the turbo DSMs runs a stock oil cooler?

There really has been no better place to research then this site, for what I'm trying to do the information is incredible.

 

[nine5raptor]

As long as you have a high pressure going in, it will push the oil out of the other side. And yes, we have oil coolers stock (the reason I made the comment about the 2g's needing the gravity drain less is because the tubo oil inlet line is coming directly out of the oil cooler and straight to the turbo, giving it full pressure. The 1G TEL's have the oil coming out of the head at a much lower pressure).

Hopefully someone else will chime in as well to back me up. Also, what have other 3.8L guys done?

 

[nine5raptor]

You could most likely give garrett a call and ask them about their T-25s or even better one of the shops like www.turbochargers.com or www.agp.com and ask them for some advice.

 

[xjarayax]

Single turbo mounted in engine bay using gravity drain.

Will post more info in a bit

 

[nine5raptor]

nothing like being original, eh?

 

[xjarayax]

That's basically what I'm going for I suppose.

Here's a couple of the turbo fbody v6 guys..

Boosted 3.4L of hell

first turboed 3.8 (had to remove ac)

The turbo 3.4 guy ran a 13.5 w/ a 2.4 60 ft at 80% throttle because he was detonating, on 10 psi. That's pretty damn impressive as those things run like high high 16's stock.

The 3.8 is a lot stronger of a motor, pulling mid 15's stock, in a heavy ass car nonetheless.

 

[sleepinGSX]

Man that looks pretty hot, any ideas what kind of power that will make. Also does the stock motor handle boost at all ??

 

[xjarayax]

Stock tuning handles 8-9 psi safely, with tuning good for 10-11 psi. You can upgrade to Grand Prix GTP pistons and then your good for 13 psi or so. I estimate 37-380 horses at 10 psi of intercooled and tuned boost.

Sam

 

[2-0turbo]

Originally posted by nine5raptor
As long as you have a high pressure going in, it will push the oil out of the other side.

Absolutely not. This will not work. You must have a free drain for the oil to get to the pan. You cannot even submerge the drain into the oil in the drain pan, or it will back up in the drain. Check out Lingenfelters site. They use twin T25's on their turbo Corvette. They actually use a smaller pan below the main pan and then pump it back up into the oil pan. The oil coming out of a turbo is at very low pressure and frothy. If you don't give it somewhere to go, it will go out the seals of the turbo.

 

[2-0turbo]

Originally posted by xjarayax
The LS1 V8 Fbody TT kit comes with a scavenge pump, but the turbos are larger and support a higher flowrate. Since it's an electric pump, I'm worried that it's going to suck the turbos dry and I'm going to run into problems.

I know Lingenfelter uses T25's (actually, GT25's) on his twin-turbo Corvette project. He uses a scavenge pump. I don't think you could actually suck the turbos dry. I don't have flow rate information for you to feel better, but they are getting plenty of oil. Disconnect the oil supply once and start the car. Now rev it to 7K and let me know if you are getting enough oil. X2 for two turbos. I'll think you'll be alright uses the scavenge pump that you speak of above.

BTW, nice workmanship!

 

[nine5raptor]

Originally posted by 2-0turbo


Absolutely not. This will not work. You must have a free drain for the oil to get to the pan. You cannot even submerge the drain into the oil in the drain pan, or it will back up in the drain. Check out Lingenfelters site. They use twin T25's on their turbo Corvette. They actually use a smaller pan below the main pan and then pump it back up into the oil pan. The oil coming out of a turbo is at very low pressure and frothy. If you don't give it somewhere to go, it will go out the seals of the turbo.

my oil drain it actually under oil with the proper amount in the oil pan (as evidenced when quite a bit ran out when I took of the oil drain, even with the front end of the car lifted)