I have a 64 Olds Fiesta that has dual coming straight out the back below the bumper (same as stock I believe only duals now). Problem is that when I drive with the back window down the exhaust smell comes inside the car no matter how fast or slow I drive, it stinks. Any suggestions?
Yup, been there, done that. I had to have the tailpipes turned to come out the sides, behind the rear wheels. I had the exhaust problem even with the tailgate window closed.
Wagons leave a low pressure area behind them, especially boxy ones. It is extremely dangerous to drive with only the gate window open. The only way to safely drive with the gate window open is to open the front door windows. There really isn't any way to make it safe to drive with only the gate window open. Even the cars with catalytic converters are not safe to drive with only the gate glass open. The 91-96 GM B-body cars have a switch that does not allow you to unlock the gate glass when it is in gear. There is also no provision to allow the gate glass to be unlocked by the third row passengers. So, do not drive a station wagon with the gate glass open unless you open the front door windows as well.
I've driven my 1955 Chevy wagon with the lift gate up only, the talgate down only, and both open. No smell. Of course the dual pipes came out on each side just in front of the rear wheels. I don't think the lift gate should be up because of possible springing and bending of the brackets. For short trips with 8' boards it was necessary. But I can't remember if the side windows were opened. I'm sure they were. Didn't have AC and it was summer each time. I agree only do it with the side windows partially open at least.
With the Bronco I used to have, the exhaust was a problem with the T/G window down, unless the wing windows were both open. I had always been taught that the T/G window should always be closed, and if you did have to have it open, it should be with the wing windows open at speeds less than 25 MPH.
Exhaust turn-outs out the side. The rear bumper dump will be sucked back in due to the low pressure created when the window is opened.
YUP!! And even out the side if not correct will suck the fumes into the wagon. learned it the hard way long back with my 80 Colony Park. Was a single exhaust when I got it and changed to dual and although I kept the pipes at the side, I had them coming out as close to the rear as could be done = carbon DIEoxide in the car. Had the pipes shortened back to where the factory location was/would be and problem solved.
never hsd them installed but there are small wind deflectors which attach to the rear posts and deflect the exhaust from the back window. search for station wagon rear window deflectors on google
I would love to actually try that with a Fox car; a wagon would likely be better in that instance, as the battery units and controller could be in a box under the hood and the drive motor can be in back at the rear axle.
