Visit The Dirt Forum for More Information

Author Topic:   Mufflers
poboy2
Dirt Freak

Total posts: 219
posted November 04, 2001 08:30 PM
Want to go with the sleeper image this year. Looking for a real quiet muffler without hurting performance too much. Any suggestions.

RangeRover
Dirt Maniac

Total posts: 174
posted November 05, 2001 07:06 AM
We are one of the few cars at our track with mufflers. I love the way the car sounds and I'm more comfortable in it. Another plus is that I can hear an engine problem easier. We run a pair of Flowmaster mufflers, but I've been tempted to try a 2 into 1 system like I saw in a magazine a while back. I don't feel that the mufflers hurt power noticably, but they may actually improve low and midrange torque. One more thing to add, they are not exactly "quiet", but they are much quieter than open headers. Yep, mufflers are cool.

Wild Bunch Racing
Dirt Full Roller

Total posts: 53
posted November 06, 2001 05:59 PM
Well I think you need to run a two into one to help pull out the gases out of each pipe and it will help you hear what is going on aroud you and concentrate on your driving.

poboy2
Dirt Freak

Total posts: 219
posted November 06, 2001 06:10 PM
define a two into one muffler please.

RangeRover
Dirt Maniac

Total posts: 174
posted November 07, 2001 08:43 AM
A 2 into 1 exhaust system simply merges the left and right headers down from the collectors with a Y that takes in both sides of exhaust and combines them into one exit which may go into a single muffler or dumped openly. Research has shown that these systems are pretty good for producing or restoring torque and reducing noise. An added benefit is that you only need to purchase one muffler.

poboy2
Dirt Freak

Total posts: 219
posted November 07, 2001 06:12 PM
wouldn't a 2 to 1 set-up rob a little more horsepower vs having a muffler for each pipe?

cage86j
Dirt Forum Racer

Total posts: 85
posted November 07, 2001 06:26 PM
poboy i would think you would lose a few horses trying to force the exaust from all 8 cyls into one pipe i had better luck when i switched from "y" pipe to seperate exaust


Wild Bunch Racing
Dirt Full Roller

Total posts: 53
posted November 07, 2001 07:33 PM
Well I have a few questions you need to ask yourself. What type of headers am I running? big tube short headers or small tube long headers? Also what type of RPM range are you running? a short track theat requires a huge torque curve or a long track that needs more horse power? These are all questions you need to know the answers to. A single header will increase torque in the lower to mid-range rpm band. Two mufflers will increase the torque band in the mid to upper RPM Range. Let me know more info and I will try to help you okay.

Wild Bunch Racing
Dirt Full Roller

Total posts: 53
posted November 07, 2001 07:35 PM
quote:
Originally posted by Wild Bunch Racing:
Well I have a few questions you need to ask yourself. What type of headers am I running? big tube short headers or small tube long headers? Also what type of RPM range are you running? a short track that requires a huge torque curve or a long track that needs more horse power? These are all questions you need to know the answers to. A single Muffler will increase torque in the lower to mid-range rpm band. Two mufflers will increase the torque band in the mid to upper RPM Range. Let me know more info and I will try to help you okay.

Sorry can't type

racer17j
Dirt Forum Champ
Total posts: 1565
posted November 08, 2001 12:37 AM UIN: 54865418
we had a guy that ran a 2-1 system in our class and now it's not legal to run any thing but duel exaust cause of the torque that he gained with it

Flatlander
Dirt Freak

Total posts: 310
posted November 08, 2001 11:25 AM
header lengths - even or uneven tubes are also a way to adjust your torque curve

istock59
Dirt Freak

Total posts: 237
posted November 08, 2001 12:34 PM
Yep, we used to run a Y-pipe from Brzenski, before the IMCA rules outlawed it. The driver seemed to think it made more torque. Dunno for sure, but it quieted the motor pretty good too.

What about the Vortex cones that Dynatech makes? Anybody try them yet?

[This message has been edited by istock59 (edited November 08, 2001).]

c21
Dirt Freak

Total posts: 346
posted November 08, 2001 01:46 PM
Had an 18" Howe muffler that was supposed to quite to 95 db (which was the track limit), we stuck a Dynatech Vortex cone (5", not cheap) inside the muffler pointed forward and shaved 2 or 3 db. Later when more of the muffler packing blew out we put a pc. of perforated metal accross the exit of the 5" turndown for qualifying (the only time they would check sound) and sometimes we'd stick a highly punctured Pepsi can between the cone and the perferated metal. I know it sounds Mickey mouse but the alternative was starting at the back of the "B" if you were dq'd for sound.
The last "fix" that really seemed to work was to take a supertrap muffler and attach it to the end of the turndown for qualifying, this had a little more tuneability then varying the number of holes in a Pepsi can.

[This message has been edited by c21 (edited November 08, 2001).]

zero
Dirt Newbie

Total posts: 4
posted November 14, 2001 05:38 PM
How quiet do you want to run? We run lobak's, depending on which track we run we switch header muffler size. If you want to run quiet quiet 24" long bodies with the small center hole (86db's at 50'), If you want to run 92 at 50' cut them in half and add a turn down on them. They make different lengths and different center hole sizes(the key is the center hole for noise).They even make twin mufflers for the two into one systems.

Yogster33
Dirt Roller

Total posts: 13
posted November 22, 2001 11:02 PM
Does anybody know who makes a good lightwieght 2 into 1 muffler? Reasonably priced.thanks

Back to the Archives