I have stock exhaust setup with a turn down tailpipe exiting at the right rear of the vehicle (turn down faces downward and is pointing straight out rearwards) and I get a lot of fumes in the cabin with the rear window removed, any suggestions?
There is nothing you can do. The wind travels under the vehicle while driving and then comes up into the low pressure area created by the big square forcing itself through the air. You can try routing the exhaust differently or getting a bikini top so air is going around the sides and pushing the fumes away but until your aerodynamics change, that low pressure zone behind the jeep will stay there and all higher pressure air will continue to move into it while moving.
I don't feel like working on anything, at this time.
Updraft from the large, flat back side of the vehicle pushes fumes right into the cabin.
Jeeps are certainly not famous for being very aerodynamic.
Unless you have the whole top off or have a bikini installed where a lot of fresh air can rush through and carry those fumes out, you are pretty well dealing with the same issue most of us jeepers (I think I can speak for many here) deal with regularly..
Ya, not just a jeep issue. Any car with a rear window that can be opened will say do not run it that way. Heck we had an old Buick station wagon that had that warning. There is a low pressure zone behind any moving vehicle (that's how race cars get into another's drag ) so moving the tailpipe further forward won't stop fumes from coming in.
The flat boxy rear end of the Jeep tends to cause turbulence which curls the airstream back into the cab. The only reasonable solution is to crack open the front windows or remove the side windows to allow some airflow to reduce the vortex effect.
Running the exhaust out the side will help. Maybe not solve but will help. Make sure the end of the pipe clears the body by a couple of inches as well.
The trouble with THIS (ask any Midyear Corvette owner with side exhaust) is that "at idle" (like at stop lights), the exhaust wafts into your open side window(s). Prolly the only REAL "answer" is to upgrade to OBD2 and a late model engine with FULL emissions and catalytic convertor; I'm guessing that you don't wanna go to THAT level of expense JUST to run w/o a rear window...
You learn to live with CO?! The exhaust smell is not the issue LOL
I remember when cats and no lead were new things- we all thought they stunk so bad! We were used to the non-catalyzed exhaust smell.
Now everybody is used to the catalyzed exhaust and they think non-emissions-equipped exhaust smells bad.
Either way carbon monoxide can kill you...OBD2, OBD1, or no cat whatsoever!
I still like to smell nitro racing fuel in an old muscle car
How many old threads actually convince *you* to read all 36 pages? http://www.jeepforum.com/forum/f12/length-envy-build-thread-629700/