17prospective buyer

Just curious to know what pumps people with rear mount setups are using? Also curious about your oiling system in general. I'm sick of my DD being so slow, so i'm doing a rear mount turbo, and i was thinking of making the oiling system completely separate, with an oil resevoir/filter/pump mounted in the spare tire well. Plumbing engine oil pressure all the way back there seems like a bad idea to me. This way, oil temp or cleanliness would never be an issue. But what is the minimum pressure required to suspend a journal bearing/shaft in oil?

SeanR

Oil-less turbos

17prospective buyer

Yeah but i have a GT2056V that i got for free, it would be a waste to do that. I rebuilt it and shaft play is gone. There was a little heat staining of the shaft but i polished that up with metal polish.

SeanR

I've only dealt with two and am no expert. Ping KillaV here on rennlist, he has a RMT that flipping rocks. I don't know what the 86.5 that I worked on ended up doing. I know we exchanged several set ups to get it to work and would not go through that **** again.

17prospective buyer

I was going to get the VGT working but discovered it'd be a lot more complicated than just getting a lower boost actuator, apparently these things boost at idle so i'll need to run an external wastegate, and just weld the vanes open or have some kind of adjustable static control. You need some sort of specialized controller to control boost properly with VGT and have good driveability.

Lizard928

Lmao!
The GT2056 is way too small.

I use oil-less turbos, but all the others use conventional turbos.
There are a number of oil scavenging pumps out there. Get a good gear driven one when you do.

17prospective buyer

For a 1.8?? Not likely...

Btw, do you think 2.5" exhaust is sufficient for a turbocharged 1.8?

Formula94lt1

OH wow. No one knew you werent talking about a 928...

Try these for more info
http://www.homemadeturbo.com/
http://www.theturboforums.com/

ptuomov

We're trying exapump mini next. It is promising based on the feedback I've gotten from others.

You need a bypass style regulator to give you the right oil pressure out of an electric pump. I don't know of anyone who'se microcontrolled the pump with just a pressure sensor to deliver the correct pressure.

If you get a big-rig turbo diesel vnt/g turbo that matches well, you might be able to control the variable nossle with a regular electronic boost controller such as eboost2.

Ducman82

maybe he stuck a smaller engine in his 928...... :-P

Lizard928

1.8L?! Why are you thinking of turbocharging your hair drier?!

Randy V

killav

I'm using this one now. http://turbowerx.com/Scavenge_Pumps/.../Exa-Pump.html

The original pump that came with the kit stopped working after about three years, with low miles.

The exa pump is very quiet, and is very robust. But it is BIG. The mini would probably work fine in your application.....http://turbowerx.com/Scavenge_Pumps/page1/page1.html

17prospective buyer

Turbowerx seems to be pretty popular, i think i will go with that. I have the battery relocated to the spare tire well, that would make wiring marginally simpler. Wire it into another circuit that is powered in on position. How did you wire your pump? Does it come on automatically or do you manually flick a switch for it?

I'm really just bored and want my daily to be a little more fun to drive. It's already a pretty fun car with a real close ratio 6 speed manual box. The engines are optimized for low end torque, there are a bunch of restrictions at high end.

So i assume blow through MAF setup is the only way to go with a rear mount setup, too much feedback delay with pull through. Assuming the same diameter tubing as where the MAF sensor samples is used, does air velocity change from the turbo or does it remain the same, with density and dynamic pressure being changed?

Formula94lt1

If you maintain the same mass flow rate (like in this case) while increasing the density the average flow velocity will be slower after the turbo... although I don't know what it is exactly you are asking.

The maf before or after a turbo SHOULD there for read the same unless there is a leak, but after turbo and the BOV is the only place to put it because that is a large deliberate leak. In my mind as close to the TB as possible is best for the most accurate response especially in a turbo car where you are changing density in front of the TB a lot, you wouldnt want air to be able to pack in behind the maf that isnt flowing into the engine if you can help it. Also if you have a boost leak in the piping you aren't driving a pig.