Crankcase breather/ Catch can / Evac system thread. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-27-2011, 12:22 PM   #21
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Id be happy to have a turbo LS motor in my car.
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Old 03-01-2011, 08:21 PM   #22
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I just installed my set up today, it pulls vacuum even at Idle, it seems like I will have to re tune. My idle AFRs went from 14-15 to 16-17 but it still is idling smooth at those AFRs with 550s currently which is something Ive never been able to do with the 550s.
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Old 03-02-2011, 12:17 AM   #23
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? Did your fuel map move to a different load cell at idle? I don't think vacuum on the case would lean it up.

How much vacuum change do you see with it connected vs disconnected?

Also how did you do your setup? Direct? Catch can in between? What size hose and fittings?
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Old 03-02-2011, 12:33 AM   #24
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Catch can between, I have 2 3/8 hoses to my catch can and a 5/8 hose to the valve, kpa's are the same on my gauge and in ms. I have not had many issues with my catch can set up the way it was so the only thing I changed was the 5/8 hose to the catch can instead of a filter to VTA. It may have just been an ms fluke I will start the car again and see if I still have the same results.
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Old 03-02-2011, 09:10 AM   #25
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So all of you guys running this are catless, right? Oil going into the cat sounds like fire time.
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Old 03-02-2011, 12:19 PM   #26
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No cat track only car. I would think that the catch can would catch most of the oil, but this is untested obviously.
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Old 03-02-2011, 12:31 PM   #27
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Quote:
Originally Posted by Nagase View Post
So all of you guys running this are catless, right? Oil going into the cat sounds like fire time.
plenty of cars burn or use lots of oil. yeah most of that's burned inside the engine but my greddy turbo would puke lots of oil thru the turbine and my cat survived.
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Old 03-02-2011, 01:46 PM   #28
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Yes catless and you apparently need minimal backpressure and restriction for this to work. A cat or restrictive muffler could of course, hurt the flow.

That said, to make HP you have to flow air. Stand behind the tailpipe of a high hp car on the dyno and you will see what I mean- the air coming out of the exhaust is like a leaf blower.
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Old 03-02-2011, 01:50 PM   #29
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Also if you have baffled properly there shouldn't be oil puking into your can/exhaust.
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Old 03-03-2011, 04:25 AM   #30
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I got everything together on my car tonight went and added fluids and the radiator pissed out all over the floor. I must have nicked it or something while it was out actually I think the electrician who fixed light ballast in my shop might have. Got to fix that before it’s ready now. It was a Godspeed, I just ordered a CXRacing for a replacement.

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Old 03-03-2011, 11:19 AM   #31
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My cx racing one has been fine for over a year now maybe 2 but if any one can break it, it would be you.
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Old 03-05-2011, 11:11 PM   #32
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Ok so I installed a vacuum gauge on to my catch can to see if this thing really works, so far nothing idling or revving on the gauge. But I will be at Infineon raceway tomorrow for the miata challenge and I have the gauge temporarily mounted where you will be able to see it with the go pro camera I am borrowing.
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Old 03-05-2011, 11:37 PM   #33
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Quote:
Originally Posted by Gotpsi? View Post
Ok so I installed a vacuum gauge on to my catch can to see if this thing really works, so far nothing idling or revving on the gauge. But I will be at Infineon raceway tomorrow for the miata challenge and I have the gauge temporarily mounted where you will be able to see it with the go pro camera I am borrowing.
Awesome. I got my $10 oil flll cap today so I'll be putting it on in a few days. I think it will need velocity to do something. Have fun at the race!
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Old 03-06-2011, 12:08 AM   #34
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Thanks Ill try best in the rain with a crappy tune.
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Old 03-06-2011, 12:46 PM   #35
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Quote:
Originally Posted by Gotpsi? View Post
Ok so I installed a vacuum gauge on to my catch can to see if this thing really works, so far nothing idling or revving on the gauge. But I will be at Infineon raceway tomorrow for the miata challenge and I have the gauge temporarily mounted where you will be able to see it with the go pro camera I am borrowing.
Good luck at the track! We're still under snow here in the frozen north. :(

Keep in mind that you are measuring the net result of positive crankcase pressure and the exhaust-generated vacuum. If your gauge only reads vacuum, the needle will not move off of zero if the vacuum does not overcome the positive pressure.
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Old 03-07-2011, 12:10 PM   #36
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My gauge will measure positive pressure. So the results are... It does work and with out pulling any oil. Yesterday at the miata challenge my car ran like total crap, I could not rev past 4k with out my rpm signal getting confused, so I was shifting at 4k in every gear. But I never saw any pressure build and once in boost I did see vacuum being pulled. Only 1-2in but I was also at quite low load since my car really doesn't open up until 4500 rpm.
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Old 03-07-2011, 12:30 PM   #37
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Nice update, to bad about not being able to rev up, ecu\wiring problems?
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Old 03-07-2011, 02:25 PM   #38
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Ive had a similar problem before and it was the CAS, so I showed my log to Sav, he said its something in the ignition so Ill start at the grounds and check the wiring, shouldn't be a big deal. It rained hard all day so putting down power was not really an option anyways, I still had fun.
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Old 03-09-2011, 02:21 PM   #39
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Quote:
Originally Posted by Gotpsi? View Post
My cx racing one has been fine for over a year now maybe 2 but if any one can break it, it would be you.
Got my CX last night. Same size but 3-1/2 lbs less aluminum in it than the Godspeed surprisingly. Had to rework my shrouding because these cheap Chinese radiator guys canít seem to put bosses on with any accuracy every one is a custom fit.

Bob
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Old 04-05-2011, 02:50 PM   #40
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Update first track day and the slash cut was sucking oil out of the catch can and out the tailpipe after left hand corners. Didn’t do that for any of the street driving I was doing prior.

http://www.youtube.com/watch?v=5hsQYiIHiq0

I’m thinking some sort of check valve in the return line and cap off the OEM PCV breather port.

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