Good morning. Recently I finally finished the new build. It is a X and I am running SCCA T2 road racing. Last weekend was the first outing for the car. We have A LOT of small things to work on, with some being more important than others. Currently I am doing some research on the crankcase pressure, and fuel blow by issue. After every session, the oil dipstick was pushed up a bit. Also, as the weekend wore on, the oil would smell more and more like fuel. I imagine an oil catch tank will help? It is a MAF car, stock ECU, PCV valve is still in place, all part of adhering to the rule set.

Is a sealed setup the only option? Will a vented can really throw the AFR off that much? Will a sealed setup help with the pressure issues we are having?

Thanks
Jeremy

 

seems you dont have high crankcase pressures if youre not spewing oil thru thru the dipstick or into the turbo intake. maybe youre running really rich? or your pcv valve is not working

 

The driven fab one seems to be the popular choice. If you're getting that much fuel in it, it could be blowing past the rings. Make sure a leak down/compression test passes. How much boost are you running - stock or restricted stock turbo?

Did you get the pedals adjusted at all? I have a hell of a time heal/toe on the X.

 

What AFR are you running at WOT and what fuel are you using?

I'd go with an STM sealed catch can- https://stmtuned.com/collections/mit...ine-catch-cans

 

Thank you for the replies.

The car was tuned by RRT. He was made aware that the car was strictly race, and to keep it safe. I do not have a Wideband on it to log. Didnt think it would be a problem as the car would not be re tuned unless it was on the dyno. I had a Wideband on the silver IX for years and years, and never used it. The PCV valve is new. I performed a leak down and compression test on the motor before starting the build last year, and it was within specs. This is the first outing for the car. I had planned another one at some point next week when I get back under the hood. The turbo is stock, running no restrictor. If I remember correctly, the tune was 21 lbs tapering to 19 lbs of boost. Just regular pump 93 octane as thats all that is allowed in the rule set.

The pedals are disgusting... I do not like them at all.. whatsoever.. along with the clutch engagement point.. whoever designed this car and said "yea this will do" had clearly never driven an Evo before. I had thought about the Driven Fab catch can, but I dont really like it being in front of the bumper support, and its vented. If I can run a vented setup and be ok im all for it, but won't that throw the MAF into a fit?

I had also looked at the STM setup, which is sealed. What about the Radium dual can setup? The cans seem small, but it would just get drained along with the rest of the maintenance before a race weekend.

Thanks
Jeremy

 

Mine's vented when accelerating, pcv works at idle/cruise. its not connected to the turbo intake hose but afr is the same as when it was. so far I've done autox's, had a TOB issue during my last track event unfortunately

 

I autox my X and it sounds like a similar setup to yours, stock block/turbo/etc, running 93 but I'm running a little bit higher boost pressure tapering to 21. I use the Kozmic vented can with no issues w/MAF or AFR, however it was tuned with the can already installed. It is routed from both ports in the VC, the intake tube is plugged.

 

had a friend with that setup with 27#ish boost... that catch can setup was putting so much oil in his splitter/bottom cover ... driving in the rain would be a bad idea when water splashes some oil to your tires

 

Dang, that sounds sketch. I've only had the can for a little bit, about 6 months maybe, I've drained it twice and there hasn't been any oil oil. Just water and vapor mix.

 

The Kozmic can is vented isn't it? Yea I have already tuned the car, and had no intentions of putting it back on the dyno anytime soon. So whatever I end up doing will need to be current tune friendly. And I cant imagine dumping oil onto the racing surface would be looked upon positively...

 

Has anyone done a venturi in the downpipe to really pull volume of air from the engine? I think you'd need a baffled chamber to separate oil/air and let oil drain back.

I know it'd be ideal to have a vent on the block but its pretty tough to get something done there without sucking up oil. So maybe still suck from VC and drain back through dipstick?

For SCCA SM, that's not legal but on track maybe something more you can get away with?

 

which part is not legal for SCCA SM?

I personally wont bother with ports under the head
not sure if anyone will need more than 2 VTA ports.


https://www.evolutionm.net/forums/ev...l#post11952363

 

Its the exhaust scavenging that would be illegal which I was referring to. Also interesting, I just realized my catch can size is too small and I need to either reroute to intake or a secondary container.

3.3.3.B.10 -

 

I see. thanks. probably not a good idea releasing fumes in there.
i still have my old evap line which can be used for venting if needed. I dont think I'll ever connect this back to the intake

 

Maybe Ive just been lucky, but in both my 2.3 and 2.2 builds I've never had oil buildup issues in my catch can on the rear vent running -10 fitting to a Radium can with the exception of when I ran oil a bit too full.

I do have all my drains heavily ported in the head FWIW. The biggest issue is oil vapor re-condensing and getting sucked in intake. Its a slow build, but every year or two I need to pull the FMIC and pour some acetone in there to break it up and drain it out.