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Cobalt SS Racecar - F23 Fluid Leak (Vent?)

Old 07-04-2019, 11:12 AM
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Cobalt SS Racecar - F23 Fluid Leak (Vent?)

Hi Guys,

I recently finished my racecar and had my first weekend of racing. The local 1/3 mile oval track allows the car to run second gear around, just hitting the rev limiter as I get to the turn (perfect gearing). However, after each session, I have a small amount of ATF leaking. The ATF pools right beside the oil fill cap, which last night I determined is vented. I'm wondering if its possible that the transmission is building enough pressure over the 8 minutes of flatout racing that could cause the vent to loose fluid. I am not loosing a substantial amount of fluid (No Pool in Trailer After Racing), but the back of the case is damp where the fluid is running down, and a few bolts at the bottom of the case have drips ready to fall.

Has anyone racing these cars had this issue or something similar? Is there anything I can do? I have found that some Vauxhall's with F23's had a remote vent kit, which was a raised hose and allowed fluid (and pressure) to raise up the line and then return into the case once the transmission cooled/pressure subsided.

Any solutions? I am all ears!
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Old 07-10-2019, 09:49 AM
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Anyone? Car leaked oil once again this weekend, coming out almost certainly through the vent.
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Old 07-10-2019, 10:03 AM
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How much fluid are you putting in the trans?
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Old 07-10-2019, 10:09 AM
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I think jdbaugh1 was having similar issues but I don't remember what the solution ended up being. You may have to lower the fluid level some from stock, likely since its running such high rpms and hard steady corners its foaming up and out
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Old 07-10-2019, 10:42 AM
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I do have this issue while autocrossing. I never did find a solution I just let the transmission fluid find a level where it wouldn't leak out anymore. The first time I went out after filling the trans I puked out a substantial amount of fluid though I may have had the trans slightly overfilled. The next time I went it still let out a little but not nearly as much. The remote vent might be something to look at I just didn't even know that was a thing. I had the issue during autocross which I did not have high sustained RPM but many tight corners which would cause the fluid to slosh side to side with high rpm bursts on the straight sections.
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