Dual megaphone questions...

[avendlerdp]

Hello everyone-

In order to celebrate learning how to use my new TIG welder I am considering making a better exhaust for my 2.2T. It's stock with Webers and SSI's. I plan on setting the car up for some track use and would like to make a set of megaphone style exausts using Supertrapp tips. This seems straight forward enough but I was wondering if there is an advantage to connecting the two sides with an "H" pipe?

Part of doing this is for better looks and a more fun sound but the main reason of course, is to make more power. I know that some later cars benifit much from better exhausts but can there be much gained from a stock 2.2T mill by replacing the stock bananna muffler???

Thanks for reading.

Alex

[jpachard]

An H pipe is not needed and in fact reduces power( Check out the GT3 R series cars) When each cylinder bank is isolated, it reduces cross talk between the banks.

This is the solution I came up with using Coast Fab. mufflers. I hope this helps.

Cheers, James

[avendlerdp]

Basicaly what I had in mind. Not sure I could fab such a nice center bracket!! The next issue is weather this will help much on my stock 2.2t. Thanks.

Alex

[jpachard]

Alex, You will definitely see power gains but it will depend on what else you have done to the engine too. I would recommend using the Coast fabrication mufflers over a megaphone/Supetrapp setup since they are easier to set up. I have attached a link to their website.

http://www.coastfab.com

Cheers, James

[campbellcj]

Even compared to a 2-in/2-out sport muffler, I notice a significant gain in top-end power and "revability" with the open pipes. The 6000-7200rpm pull is much better. But, the bottom end suffers at least as much, so you need to keep it over 4000rpm's or you're screwed.

The sound of an uncorked 911 engine at full steam is unequalled. I HIGHLY recommend that everyone experience it some time...

[Moses]

Originally posted by avendlerdp
...I was wondering if there is an advantage to connecting the two sides with an "H" pipe?

Alex

Only on Japanese cars.

[ttweed]

Originally posted by Moses
Only on Japanese cars.

Actually, the big V8 iron in NASCAR uses crossover pipes combined with anti-reversion headers to help the carbs work better, I believe.

I would not recommend putting Supertraps on the end of a set of megaphones unless you have to meet sound regs. Why restrict the open pipes at all if it is for track work? Let the engine breathe. Remember to richen the mixture.

TT

[Moses]

Well, you can use the "H" pipe or the "Y" pipe. How bout the "O" pipe?

[304065]

Megaphones won't help unless you have a motor hotter than a stock "T". You will probably lose torque due to decreased back pressure-- the early cars need a little. The best setup is your SSIs with a dual-in, dual out sport muffler- made from an original factory muffler that's been cut open and modified. Good project for your welder!

[avendlerdp]

Thanks for the tips gents. I am interested in doing the dual out mod to my factory muffler for street use. I am sure there is a "how to" on the web someplace. Please point me to it and I'll take it from there!!!

Alex

[ttweed]

Originally posted by avendlerdp
I am interested in doing the dual out mod to my factory muffler for street use. I am sure there is a "how to" on the web someplace. Please point me to it and I'll take it from there!!!

Yah, sure- that was in this thread
TT

[jluetjen]

I'm not sure if a blanket statement that an H-pipe is not useful. Exhaust tuning is a complex subject involving accustics. There is apparently an H-Pipe option for Phase-9 mufflers (called a cross chamber) that helps the system to get below 100 decibals. I doubt that it would be there if there was a better way to get that quite and still make the same HP.

[avendlerdp]

This is what I thought. I know that on a lot of other cars the "H" pipe is a great way to get the most out of a dual system. I am thinking of making up a system with one just to experiment.

Alex

[jluetjen]

I am thinking of making up a system with one just to experiment.

Please be sure to post the results.

[TerryBPP]

I made a similar setup using Dynomax Race Bullet mufflers. Let me caution you that they are LOUD!