How is everyone that has a rear mount turbo running their oil system? Divorced?

 

Rear mount turbos are very uncommon but, there are different schools of thought about the oiling. I, for one, have been considering a remote mount turbo for quite some time and if I did pull the trigger, it would almost certainly be with a Comp air cooled or oilless turbo, just to avoid all of that oiling bs. Granted, hitting the turbo with grease every few thousand miles can get old to a lot of folks but, I'd rather do that than mess with either a dedicated oiling system in the back or routing lines all the way to the front with a pump and hope that it all holds up.

 

I feel as though rear mounts are tempting to people who have not explored turbos as much because they seem like an easy or common sense solution. If it is a street car being done on the super super cheap with some Viren Singh specials that is totally cool. You'll add some power and have some fun. The general wisdom when you're spending the money though is a tighter package. These LS engines are large and just feeding them puts a lot of turbos outside their compressor map curve and we're all trying to maximize the Crazy / Hot matrix.... that is, the More Power / Better Response combination while still being able to meet the CFM demand of the engine. 10 feet of piping reducing exhaust heat reduces the force applied to drive the turbine and increases the lag. By the time the lag is overcome and the turbo applies boost 15 feet forward and back again after an intercooler to the engine up front the turbo is running out of efficiency in a much narrower window. You do make power. They work fine. They're just not optimal.

I know there are kits in development for single front mounts which would sit under the hood. Depending on cost, that might be a direction to chase after. Or just seek a good used kit. If you're after rapid response and enough air to power 770rw, I've got an LPE TT Stage 2 kit for sale on the forum here. I keep tempting myself to sell the blower kit first and keep the turbo kit for the 427 car.... but I know I really just need to let it go since I will have the Huron TTs on the other car.

 

I would do a compound setup if I was building a rear mount kit. Plenty of room for activities and then you have the best of both worlds, response and power and the power comes on much smoother in my experience on a 2.7L Audi v6 platform.
To the OP, I would run a single feed and single return hose, then y them at the turbos as needed. and obviously pump the return back to the engine with one external pump.

 

Essentially a rear mount system here (mine sit in place of the fuel tanks and exit out the side)

Ive done all three setups (oilless turbos, a isolated cooling and oil system, and now just giving it engine oil)

Oil less still needed their own cooling loop with a tank and pump, the isolated oil had me install tanks in the rear fascia and while the benefit of isolating the engine from turbo oil it was a lot of extra weight, 2 extra pumps, lots of hose and despite a ton of trial and error would pool oil in the turbos and smoke on startup, also another fluid needing changing.

Current setup feeds oil from the engine and needs 1 scavenge pump to send it back, no smoke and keeps the turbos cool enough to not need their own cooling system so lighter and simpler.

 

Comp now has an air-cooled turbo. It's essentially a greased center carrier with a Zerk fitting that you need to regrease every 3k miles or so. Outside of the need to regrease it regularly, it seems like it's the simplest of them all--provided it gets adequate air flow.

https://www.compturbotechnology.com/...led-technology

 

Pretty cool!