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I have seen multiple mid/rear mount turbo setups, and I am not trying to reinvent the wheel. I am curious on a rear mount though, I have heard of some guys running a check valve. I can understand that I guess to hold oil in the line before the turbo, but what kind of check valve? I have never seen one for sale anywhere, and is it needed?
I guess I would like to know if I run a say #3 A/N line from the tapped oil feed on the driver side of the block back to a mid/rear mount turbo, what is the best way to set this up? Do I just run the Turbo Werx pump on the bottom of the turbo return drain, and then a return line up to the timing cover? (Thats where I plan on my return dumping) If I have to run a check valve, where does it go?
I did plan on doing a front mount, but due to lack of space, and the cost, the rear mount just seems easier right now.
You could use a check valve or solenoid in the supply line, somewhere local to the turbo.
I just used a hydraulic check valve for my low twins. I'd also use a -4 feed, no less.
And yes, the Exa for the return would be fine.
Not sure how many do it, but you could probably do a self contained oil system at the rear with a small tank and the Exa supplying and draining oil from the turbo. Not sure how much oil you would need, or whether you'd also need an oil cooler or not.
Thanks for your input Steve. I am really surprised at how many views, and really no posts. I guess maybe I should post it up on PT, since more trucks have rear mounts than cars. I have just seen some people post about how they don't like scavenge pumps but have not seen any reason as to why. I just want to know what I do, will live.
Thats kind of what I thought. I have a nice turbo, not a cheap Chinese turbo, so I am going to use a good pump. I know Black X has run a rear mount on his truck for years and years, and runs 8.6x's now, so I know rear mounts can work well regardless of what some people say.
Obviously a scavenge pump is another potential failure point, but with a rear mount you literally have no other option.
Could do a comp self contained or oiless type turbo
Bht i have used a turbowerx exa for 4 yrs now and no issues. If it does turn off you know instantly with the amount of oil burning off in the exhaust lol. But its a great pump
Could do a comp self contained or oiless type turbo
Bht i have used a turbowerx exa for 4 yrs now and no issues. If it does turn off you know instantly with the amount of oil burning off in the exhaust lol. But its a great pump
True, there is the oil-less option.
In my eyes they're still new and unproven as far as reliability goes, and from reading various threads it seems they need frequent oil/grease changes, which may even mean return to manufacturer ?
I'd be far happier trusting the scavenge pump, and did with my low mounts
Could do a comp self contained or oiless type turbo
Bht i have used a turbowerx exa for 4 yrs now and no issues. If it does turn off you know instantly with the amount of oil burning off in the exhaust lol. But its a great pump
I had not thought about the oilless/self contained turbo. I have seen guys build a stand alone oiling system, but I am not doing that.
As far as pump failure, I had not thought about oil burning off in exhaust. I was going to wire in a low pressure oil switch from a dummy light car, and wire it to a light so if I lost oil pressure, I would know.
Is there a reason you don't want a self contained oiling system? Seems like an awful long distance to plumb engine oil all the way back to the rear mount turbo(s). When you could have a self contained, half gallon system with its own pump and cooler, right there conveniently not on the other end of the car. Also, why use your turbo(s) to heat up your engine oil if you don't have to?
Just wondering if there's a specific downfall to having a separate oiling system just for the turbo(s).
Is there a reason you don't want a self contained oiling system? Seems like an awful long distance to plumb engine oil all the way back to the rear mount turbo(s). When you could have a self contained, half gallon system with its own pump and cooler, right there conveniently not on the other end of the car. Also, why use your turbo(s) to heat up your engine oil if you don't have to?
Just wondering if there's a specific downfall to having a separate oiling system just for the turbo(s).
I would think 3 things for me.
#1 Extra money for extra tank/parts etc.
#2 Higher maintenance intervals (oil breakdown faster because it such a small reservoir)
Self contained would be nice if you have the room. Need a supply pump for pressure and then a return pump. Likely need a cooler if expecting long road trips. I'm looking into a rear mount for my other car but undecided on oil system. Simpler to use engine oil.
More money for a tank, less money to spend on long pipes which would be vulnerable to breakage.
Oil only feeding a turbo would have a very very long service life. After all, it wouldnt have all the nasties from the engine to deal with.
And you would only need one pump. Turbos dont need a lot of pressure, and a Turbowerx Exa would easily be able to provide all the oil one or two need
And the same pump would both scavenge and feed...after all, it's only moving oil around, so one side will never flow more than the other.
A cooler may be needed, but really hard to say. Certainly a small cooler would be cheap and easy to install
My thoughts exactly. And on an S10, you could have a reservoir anywhere in the frame back near your turbo(s). People mount extra batteries and air bag tanks/compressors under the bed/in the frame of S10's all the time.
And you would only need one pump. Turbos dont need a lot of pressure, and a Turbowerx Exa would easily be able to provide all the oil one or two need
And the same pump would both scavenge and feed...after all, it's only moving oil around, so one side will never flow more than the othe
You think it could work with one? I wasnt sure if it could suck from the reservoir for supply yet still draw from turbo drain side at the same time. Drain line to reservoir would have to be near bottom of tank, and then reservoir would have to be below turbo which really cant be done as the turbo is already very low. Supply side to turbo is small so the suction side is not going to process alot of oil. Granted drain amount out the turbo is small but inorder for it to make it back to say a 4 qrt tank, pump better be flowing 4 qrts. And it needs to be regulated witha bypass for pressure supply to turbo. Can the bypass handle all the oilflow from tank and still draw the drain line is the question in my mind
I'll have to look into it and maybe mock up an assembly. I'd like to use one pump
A dedicated turbo-only oiling system will need a miniscule amount of oil, and the oil will last nearly as long as the turbo itself.
Using the cooler as the reservoir is absolutely an option if space minimal.
Both sides of the pump, and thus, both sides of the turbo, are going to see the same pressure. So it doesn't matter if you go:
Cooler/reservoir -> pump -> turbo
Or:
Cooler/reservoir -> turbo -> pump
The pump can pull oil through the turbo, or push it through, it should all be a stable pressure on both sides.
I have twins mounted under the cab (01 x-cab s10), single EXA pump returning the oil to the pan via -10 AN lines. I installed a -10 AN summit check valve after the pump and cycle the return pump for 2 minutes after the truck is turned off with a 12V time delay relay REF: 74205. I have also installed a 4 psi hobbs switch in the oil drain lines pre-pump and wired it to a red LED mounted on my dash in case the pump stops working. No oil in the exhaust after 1800 miles and 20 passes at the track.
I appreciate the conversation here. Yes, on my S10 space on a rear mount is very much at a premium. I don't want to go with a stand alone oiling system for a couple of reasons.
1. Is defiantly space. With a battery under the truck, a turbo, hot side piping, charge piping, and at the very least just a scavenge pump, and a factory fuel tank and oh yeah, a massive driveshaft I just don't see the room to do it properly.
2. On the engine, it has 6 qts of oil that can be fed, and returned, and some time to cool. If I did a self contained setup, I could run what 3 qts in a small tank, lines a dedicated pump, but that 3qts will heat up more because it is dedicated to turbo IMO.
I am thinking a scavenge pump, lines and I have heard of a check valve, just don't know of a specific one.
On my 01 x-cab s-10 I run a Turbowerx Exa pump off of my set up, no issues after 1800 miles and 20 passes at the track. Twin 6266s mounted under the cab. -10 AN oil drains pumped back to a bung welded into the oil pan. Turbos are fed with oil via a single -4 AN line off of the block above the oil filter then tee'd to each turbo.
I run a summit check valve PN: SUM-220194B after the pump to keep oil from coming back down into the turbos. No check valve pre turbo.
I also run a 12V time delay relay to cycle the pump for 2 minutes after the truck is shut off. REF: 74205. Before I installed the relay oil would pool in the turbos and leak into the exhaust and intake over night.
In the oil drain lines before the pump I mounted a 4 psi hobbs switch, then connected it to a RED LED on my dash to indicate when the pump is not working.
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Rear mount turbo oiling 
