Race Breather Setup
 

what breather setup should be run on a turbo race setup. races are 20 mins long so i don't think there will be a need to return oil to the sump. should a pcv still be used to evacuate or a simply vent to atmosphere via a catch can? or something else?

Thanks

I killed the PCV, I run a -10 line from the turbo-side of the valve cover to the small Jeg's can with steel wool stuffed in the top. I have an insanely low amount of blow-by and I accumulate about 2oz of water/fuel in the can after 2-hours of track time...and I'm over-estimating.
https://www.miataturbo.net/attachmen...ine=1330807345

that's how i have it at the min. just wasn't sure that was enough. guess i am just over thinking it.

Depends entirely on the power level, but at some point you will either need a quality ($$) air-oil separator with a gravity drain and a quality vacuum source, or a separator+vacuum pump setup ($$$), or a dry sump ($$$$$).

power level is around the 300whp level. FM bottom end, fettled head, GT2871. nothing crazy. seems to have very little blow by.

what about running pcv with a separator between the pcv and the inlet manifold and a separate catch can on the exhaust side for when under boost?

We're going to separator/vacuum pump on all our engines. We'll have a prototype system in few weeks. If it's something we can produce at a reasonable cost, we'll either add it to our site or give you the drawings and buy them from you :)

Vacuum pump FTW.

If I could do over, yet again, I would do a vac pump. Or a dry sump.

are there any decent 12v vacuum pumps available that would suit the purpose rather than something belt driven? seems to be plenty available but will any of them be any good for this?

I think you can buy diesel vacuum pumps from summitracing. Would that do the job?

not sure... has it been tried?

no, not exactly, but its a vacuum pump. They use them for brake boosters usually, I think. So its the same idea! I thought about it, but I am NA and I am not exactly racing here, so I figured it was overkill.

cant see why it would not work but there must be a reason they are not used regularly.

not exactly the biggest issue before. I think up until recently, most FI worries was about reliability and tuning (I can't really say for sure, as I am new to the miata game compared to most around here).

As you can see, Emilio is considering a setup with a vacuum pump at this time. As higher priority concerns have been taken care of, I think people have more time to dot the "I"s and dash the "T"s sort-of-speak.

Anyways, for now I would listen to what Hustler said on this one (or try your hands at a vacuum setup).

OHhh, before I forget. There is some non-miata relevant information on this:
http://www.sr20-forum.com/informatio...d-edition.html

http://forum.diyefi.org/viewtopic.php?f=24&t=357

There's a reason why you run your AN line from that side of the valve cover, right?

Yes, it puked oil out of the left hand side in that pic when he tried it.

The baffles on the passenger side don't work so well and they end up puking lots of oil.

Belt driven pump or electric?

Here's the vacuum pump that I'm using for my set-up:
http://cn1.kaboodle.com/img/b/0/0/1b...=1322360428000
Obviously I put my name on it.

Belt. Using the OEM damper with a 4 rib and tensioner off the drivers side down low. Other potential variation is a 6 rib with our new billet dampers S/C version.

I wonder if belt and pulleys get involved, isn't it better instead of a vacuum one to add a real oil pump and go dry sump? It would be a bit more expensive but at least done right.