Question about priming my turbo (probably stupid)
#1
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Question about priming my turbo (probably stupid)
Usually when I prime my turbo (at least on my old WRX) I would pour oil into the feed line. This is the first time, however, on my miata, I have a funnel going directly into the feed port. To flow through the turbo, does oil need pressure? Or is there an obstruction in my drain disallowing the oil from flowing through?
Thanks,
Brian
Thanks,
Brian
#6
Hey aug,
Just adding to the previous post, i would recommend disconnecting the ignitor instead of disconnecting the plug wires since there is a chance you can burn out the coil packs. Also if you cranking for awhile you can disconnect the main EFI relay. This will allow you to crank but the fuel pump will not run.
Just adding to the previous post, i would recommend disconnecting the ignitor instead of disconnecting the plug wires since there is a chance you can burn out the coil packs. Also if you cranking for awhile you can disconnect the main EFI relay. This will allow you to crank but the fuel pump will not run.
#8
What I read in a car magazine was you hold the turbo in the engine bay connect up your turbo oil feed line to the turbo but not have the turbo fitted to the manifold.have a friend start the car then switch engine off once oil comes through the drain part of the turbo now you can fit the turbo to the car as its already primed.
#12
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F that priming stuff. Have someone hold the compressor wheel so it doesn't spin. Start the car, (maybe make sure oil is coming out the drain line by putting the line into an empty quart of oil), if you're getting oil, have your buddy let go of the compressor wheel. It's that simple.
#13
I see there are a few ways to do this.
This might be a Megasquirt question, but I know that if you hold the gas to the floor while cranking the engine, it will not start because the factory ECU goes into a super lean (like 20:1 ) mode. This is sort of a universal thing among pretty much all fuel injected cars. Doing this could permit priming the turbo without pulling any electrical connectors.
Is there a similar function with Megasquirt?
This might be a Megasquirt question, but I know that if you hold the gas to the floor while cranking the engine, it will not start because the factory ECU goes into a super lean (like 20:1 ) mode. This is sort of a universal thing among pretty much all fuel injected cars. Doing this could permit priming the turbo without pulling any electrical connectors.
Is there a similar function with Megasquirt?
#16
BTW, what is the point of priming the turbo, and why don't you have to do this every time you start the car?
Last edited by SignOfZeta; 11-26-2010 at 02:16 AM.
#17
When u get a new turbo, its usually dry, sometimes it has grease from the factory to prevent rust and help with assembly. Grease is usually much thicker from the motor oil.
I have seen first hand what happens to new parts with such tight tolerances. They bind and get badly scratched (when a worker tries to straighten them out) to where they need to be refinished and in most cases thrown out since to refinish it you have to remove material you simply do not have. Oil is the life of a turbo.
Just a bit of a background at my job I usually work in the .0001 ranges.
I have seen first hand what happens to new parts with such tight tolerances. They bind and get badly scratched (when a worker tries to straighten them out) to where they need to be refinished and in most cases thrown out since to refinish it you have to remove material you simply do not have. Oil is the life of a turbo.
Just a bit of a background at my job I usually work in the .0001 ranges.
#18
OK, that makes sense. I have noticed that brand new turbos have a lot more resistance than one with even an hour or two on it. Where I work (a dyno lab) we always prime the oil systems on new engines (or ones that recently saw significant service) by cranking them until we see oil pressure, and only then letting them start. I always thought it was for benefit of the bottom end and cams.
So why is having it turn while being primed bad? (looking at what thirdgen said).
Also...how is it not going to get primed? I mean, you're saying that if I just start the engine normally...the turbo is somehow going to run dry until it fries the bearing? Why?
So why is having it turn while being primed bad? (looking at what thirdgen said).
Also...how is it not going to get primed? I mean, you're saying that if I just start the engine normally...the turbo is somehow going to run dry until it fries the bearing? Why?