side exit exhaust

[Muskrat]

Since the day I started reading these boards, I've seen continual posts from guys complaining about exhaust getting drawn in from the rear of the car while moving. Some have tried putting a longer tip at the back of the car with some success. Others put they're rear exit muffler at a bit of an angle to spit the gasses away from the back of the car. A few have even just run a cobra-style side pipe down the side of thier car (LOUD).

 

Might be worth giving something like this a look. I just send an email to Dr. Gas to find out how long the street pipe is, but the actual cross section of the pipe is 8"x 1.25". Its got more cross section than a 3" round pipe for you ZXT swap guys worried about flow.

 

http://drgas.com/item.asp?id=148

 

If nothing else, it would do a pretty good job of blowing the exhaust gasses away from the car at speed, along with being able to put whatever muffling you can fit in the transmission tunnel to make it quieter than the true-sidepipe option.

 

Muffling it sufficiently shouldn't pose too much of a problem. I cant see any reason why this long muffler wouldn't fit, and if I understood the infor Grumpyvette posted correctly, a Vortex cone would not cause any noticable restriction, at least on a NA car.

 

http://store.summitracing.com/partdetail.asp?part=SUM%2D630630&view=2047&media=2

http://www.secureperformanceorder.com/dynatechdragstore/vortex.cfm

 

Never know, it might be worth look. I personally am going to put my car up on a lift this coming weekend and take some measurements, just to see if it would even be possible.

 

I can already see a potential problem or two, however.

1. ground clearance, and clearing the framerail

2. driver or passenger pan getting hot

3. instead of sucking exhaust into the car at speed, you may end up fixing one problem only to blow exhaust in the face of the poor guy at the McDonald's drive-thru.

 

If you guys can't blow any significant holes in the idea, I'll just be modifying the driver floorpan that is getting replaced anyway to fit the boom tube flush with the rest of the pan.

[Guest Nic-Rebel450CA]

If you have a side exit exhaust like that, where would you put a muffler?

 

And what about:

Unit Price 139.95

and it's not even finished

Finish seam and plug welding is done by the end user.

 

As I mentioned in a few threads before, I think the problem is simply with people using too big of an exhaust system. Too much area to flow through means low exhaust velocity.

[Muskrat]

NIC rebel, you must have been looking at one of the actual circle track application side pipes, not the one they make for street rods.

 

One 3" round Inlet Street and Hot Rod Boom Tube from Dr. Gas. Dr. Gas has had many requests for NASCAR style boom tube outlets for street use, that we had to do it. The 3" Round inlet transistions into a very thin 1 1/4" X 8" tube. The outlet opening length will be longer after trimming if the boom tube exits on an angle. HPC ceramic coating is recommended after welding is completed. Fully MIG welded.

 

Good points, I suppose I wasn't specific enough with my first post.

 

All of the muffling would have to take place inside the transmission tunnel, which would really require something like a glasspack instead of a muffler. I am midway through reassembling my 280zxt engine to swap into the 240, which is why this would essentially be a standard 3" exhaust system, up until the side exit.

 

As I said, I have no idea if this is a workable idea, but some measurements of the transmission tunnel will help greatly. I just hope it doesn't turn out to be another good idea, right up to the point somebody takes a tape measure to it.

[Guest Phil1934]

If you want oval exhaust, check the used NASCAR parts sites. If you want to run a 3" exhaust, consider buying the auger mufflers from Speedway and sticking them in the pipes with a tack weld. They do require a smidgen of griniding on the OD to fit. Just tack weld one end. They are a foot long but you can run more. Moroso offers this in their spiral flow muffler, but the Speedway inserts are only $15 each.

[Guest Nic-Rebel450CA]

If you were to put a muffler in the trans tunnel, then why not just install a turndown tip after the muffler? $10 vs $130 is a pretty good savings.

 

See, the reason most people have problems with the exhaust gases is because they are trying to keep a standard exhaust layout. A glasspack or similar in the tunnel is going to be quite loud, hot for the trans, and is going to resonate through the car, which is not an option for most.