The Dodge Challenger Message Board

That's humungus uplift at front. But there's nothing to be done to fix it without ruining the look of the front is there? I don't think those little chin spoilers would do much. I did read of a Mopar ( i think 68 Charger) that had its entire underbelly sealed off - so that it was relatively smooth surface all the way through from front valance to rear. Apparently that did help the drag and uplift quite considerably - one method of ground effects. Lot of work though. i wonder if closing off the entire front grille (from behind so it could not be seen) area and then putting large air catchers underneath to supply the cooling and induction (like the ones in this picture but spread right across the lower area). It would stop some air getting under the car and the closed off grille would would divert air flow over the bonnet as well.

The overhanging hood is as much to blame on the '70 model as the recessed grille.

One way would be to put a fine wire mesh across the front to make the front seem flush to higher speed air yet allow some air through at low speed.
In a similar way that they flushed the front grille (and rear window) on the 1969 Charger 500.

The T/A spoilers I fitted are not going to do a great deal. But, along with a lower mounted licence plate, they will reduce some of the front lift and also direct more air into the radiator which is something else I want.

Slightly better than no front spoilers at all.

I think the 72-74 model's, slice the air a little bit better at high speed. But, let's face it. They're all brick's in the wind, compared to what they have today. Or even yesterday. I don't care! I like my brick!!!

patrick wrote:But, let's face it. They're all brick's in the wind, compared to what they have today. Or even yesterday. I don't care! I like my brick!!!

Hey, they're possibly the nicest looking bricks-in-the-wind in the world for their class i reckon. Even by today's standards. But they're still making bricks even as we speak. Surely the Superpoo WRX and Mitsu Evo's are among the brickiest, grossest, chunkiest looking things around. They are horrible styling for modern "sports" cars.

(am i allowed to say those things Dave?)

I think the smaller chin spoilers look cool. Semi black on mine would fit right in. Not really noticable, just adding that little extra something.

As for the T/A duck tail spoilers, would these one cause more air/exhaust swirl in back. Just thinking of the fumes or soot from factory tips.

Hey, they're possibly the nicest looking bricks-in-the-wind in the world for their class i reckon. Even by today's standards. But they're still making bricks even as we speak. Surely the Superpoo WRX and Mitsu Evo's are among the brickiest, grossest, chunkiest looking things around. They are horrible styling for modern "sports" cars.

(am i allowed to say those things Dave?)

Our bricks are cool and, full of power!

Jon wrote: As for the T/A duck tail spoilers, would these one cause more air/exhaust swirl in back. Just thinking of the fumes or soot from factory tips.

Should be less. The exhaust fumes "suck" back at the car because of the low pressure area at the taillights.

A spoiler "tumbles" the air (the technical term is "disrupt Laminar flow") moving over the car into that space and so reduce the pressure there.



Or maybe it's just decorative.

dave-r wrote:

Jon wrote: As for the T/A duck tail spoilers, would these one cause more air/exhaust swirl in back. Just thinking of the fumes or soot from factory tips.

Should be less. The exhaust fumes "suck" back at the car because of the low pressure area at the taillights.

A spoiler "tumbles" the air (the technical term is "disrupt Laminar flow") moving over the car into that space and so reduce the pressure there.



Or maybe it's just decorative.

So I have just spent ages sealing up every little hole I found at the back of mine as I was getting fumes in the cockpit, and the way you are talking It is a common problem. Is It only on challys with tips on or common to all challengers even with a single system

It is common. But the bad smell is more to do with tuning than aerodynamics.

Modern fuels do not burn the same way as old fuel did. And it smells different. Some brands (like the current Shell V-Power) stink to high heaven.
Things get even worse if you have a longer than stock duration camshaft.

There are several things you can do to limit the smell in the car.

1) First of all customise the timing curve of your distributor so you can get much more initial advance.
The high initial timing advance will clean up the exhaust and stop it smelling rich.

2) Tune the carb so that you have around 14.5:1 air fuel ratio at idle.

3) On the motorways drive with the door glass up.

4) Make sure the PCV system is functioning correctly. Don't just use breathers in the valve covers and make sure the PCV valve is in the drivers side valve cover.

5) Make sure there are no openings in the bulkhead to let engine fumes in.

6) Make sure the rubber seal in front of the air vents in the cowl actually seal to the hood.

7) Extend the exhaust tip out as much as possible without it looking silly. if you dont have the chrome challenger dual tips then turn the end of the tailpipe(s) down.

Try fitting a T/A type spoiler to the trunk lid.

That is about all you can do to reduce the smell in the car as much as possible.

wolfman wrote:

dave-r wrote:

Jon wrote: As for the T/A duck tail spoilers, would these one cause more air/exhaust swirl in back. Just thinking of the fumes or soot from factory tips.

Should be less. The exhaust fumes "suck" back at the car because of the low pressure area at the taillights.

A spoiler "tumbles" the air (the technical term is "disrupt Laminar flow") moving over the car into that space and so reduce the pressure there.



Or maybe it's just decorative.

So I have just spent ages sealing up every little hole I found at the back of mine as I was getting fumes in the cockpit, and the way you are talking It is a common problem. Is It only on challys with tips on or common to all challengers even with a single system

Since you have checked the back end, maybe look at the cowl seal to hood where the air passes into the cockpit. Fumes from the engine can migrate in there big time. (along with the other seams and grommets.)

Wow, full circle on this thread. Back too the hood again.