rmackintosh

Anybody run a race exhaust down the tunnel and dump the exhaust down before the "axle"? I did this in my Camaro, but was wondering if this is common/done with Corvettes. I don't have a transmission or diff in the car now to see how much room there to do this.

If it is done, anybody have pics of such an install? Thanks.

Painrace

You want to keep the heat away from the transmission and rear end or anything that could catch on fire like wiring!

Jim

rmackintosh

Right....I can't say I know how close the trans would be, but I would use turndowns to point away from car.

BEZ06

Here's one that dumped the hot exhaust right out onto the leaf spring. Turndowns would probably help.

If you're running coilovers and have removed the leaf springs, then I guess you don't have to worry about melting the rear leaf spring!!!

Bob

0Vector Vette

I ran mine out the side and went thru the frame. I cut a hole in the tunnel and floor and boxed in between the tunnel and the frame. Cut a hole in the frame and boxed that in as well. Exhaust goes out the side under the door. Came out great and no trouble with sound control.
Robert

95jersey

I looked into this and even if you could fit turn downs (which is VERY hard on a lowered car), you still have a LOT of heat around the tranny and rear and leaf spring. Somehow if you could get them to go out the side would be better, but very costly. Just get a set of strait pipes over the axle and out the back. You'll get the same effect without any of the disadvantages of dumping the heat near the rear/tranny.

rmackintosh

Yeah, leafsprings will be long gone...hehe ARE long gone even though no coilovers yet......

rmackintosh

Are you running mufflers in that setup? If so, what kind will fit?

We run at Laguna a lot and the car MUST be quiet. One worry is with door exit exhaust (I JUST LOVE THE LOOK by the way) is it will point DIRECTLY at the sound meter at two of the three tracks I normally run--Laguna being one of them.

In the Camaro I ran 3" dumped at the axle with two 18" Lobak (think Moroso Spiral) mufflers. Sound was 91 db.....quietest car out there.

Any pics of your setup?

Thanks

0Vector Vette

I run Flowmaster bullit mufflers. Not much of a muffler but we are allowed 103db around here. Never had a problem. If you have to be in the low 90's I don't think it will work. I have been told many times that my car sounds nasty on the track.
Robert

dfinke23

Really nasty when all eight are firing.

0Vector Vette

What, You don't like that fart sounding V7?

rmackintosh

Hehe.....technically we run 103 db most of the time as well...however.....when you run at Laguna....sound is from the Twilight Zone. Normally quiet cars will blow sound all the time.

I was kind of dissappointed with the LS7 and the Lobaks sound wise to be honest....my car was TOO quiet. But I hate to play that game....and I would be pointed right at the Laguna sound meter.....sigh....

davidfarmer

dumping a few thousand CFM of hot air under the car isn't great for aero only. I prefer to run it out the back, out the side, out the top, anywhere but underneath.

rmackintosh

....good point....

I guess I could turn it quick and take a "forty five" degree angle across the passenger floor allowing for a much longer muffler if I get busted by the sound cops.....

coffey

Like through the frame with a thin stap of metal to reinforce it?

coffey

If you do a side exit that points towards the sound booth you can add a turndown at the exit that points at the track. That tends to bounce some of the sound off the track and away from the sound booth. It can be removable/configurable for different tracks.

Short-Throw

On the Beast, I run an adjustable muffler set up like you're looking for.

I am able to remove either muffler and replace with straight pipe. This allows me to meet sound requirements wherever I run. I run two different size Borlas. It takes literally minutes to swap the different configurations. I've never had an issue with a hot tranny of diff throughout the history of the car.


The first three pics are when the car was running a stock sized transmission -- pre Holinger.

The last three pics show the Sequential tranny and only a one small baffler muffler set up.














Hope this helps and feel free to shoot me a PM if you'd like more help.

Mike

VGLNTE1

I added cutouts at the end of my x pipe with turn downs. So i can just change a plate to have mufflers or straight pipe