Join Date: Mar 2010
Location: Mountain View CA
I find my oil is diluted with gas to 3-4% in 200 track miles (per Blackstone analysis). This is thinning the oil fast. I change every two days.
I have a BOE catch can (open-loop) on the bigger vent pipe, and a small Aluminum Moroso catch can on the smaller vent pipe that is routed to the low-vacuum (air cleaner side of the throttle butterfly). This is a switch to the opposite side of the butterfly for the smaller vent versus OEM.
My logic is that the low vacuum will help keep the crank case pressure low at WOT. The OEM configuration, when off-throttle, sucks air from the air-cleaner/low-vacuum side, through the valve cover, and out to the high-vacuum side into the intake. This is the source of most of the rebreathed oil in my experience.
I get little oil in the BOE open-loop can and a small amount of condensed gas (20ml per track/race day) (I fill the can with SS cleaner pads). I get more condensed gas (40-50ml per track/race day) in the Moroso closed-loop can.
The car has stock SC w/ 3" pulley, 550cc injectors, ITG intake and BOE TQ300 tune. I recently switched to a Laminova oil cooler (and don't yet have new Blackstone data on dilution).
2007 Exige S
Stripped down and turned into a track animal