mufflers
 

I just installed a set of mufflers on my stocker engine . Has anyone tried mufflers and if so what should I do with the timing and jets ? Richer or leaner or what . Any help would be greatly appreciated . Mike

Re: mufflers
 

I have not tried mufflers on a stocker. I have tried them on various race engines. MOST any muffler that actually works as a muffler will present at least some restriction.

It depends on how much of a restriction the mufflers are compared to your open headers. The more of a restriction they (the mufflers) are, the leaner you'd need to be, compared to the open exhaust. Of course, that all depends on how close you were to ideal to begin with. It also depends on how well your headers were tuned to your combination to begin with. I'm not sure on timing. However, if the mufflers present any real restriction, they MAY contribute to left over exhaust contaminating the intake charge. That MIGHT require more timing. Again, it depends on how close to ideal you were to begin with.

Re: mufflers
 

I put a set of the IMCA mufflers on my crate motor stocker. It was .08 slower in the 1/8th mile.
Chip

Re: mufflers
 

Chip Did you change anything .? I haven't had the car to the track yet but it sounds lazy ???????? Mike

Re: mufflers
 

I used a self tapping sheet metal screw. I screwed them directly into the collector. I ran them a couple of races. I needed to move up on the sheet at a race and took them off I picked up .08 from previous pass.
These mufflers are cheap. I bought them from Speedway Motorsports, Around $50 for the pair. If car is tuned properly probably won't be any difference.
Chip

Re: mufflers
 

I run Flowmaster 1 chamber race mufflers , didn't see any difference with or without them on the car. Installed an X pipe and picked up .2.
Does any stocker's run an X pipe on an open exhaust ?

Re: mufflers
 

I`ve gone back and forth with the Dynomax Bullet mufflers on my V 6 Stocker,and the car didn`t change at all. Never changed the timing or jetting either. They just added about 30 pounds to the car,which quickly came out of the weight box. The mufflers do sound nice though.

Re: mufflers
 

why would you want to put mufflers on in the first place?

-unless you are running IHRA pure stock?

Re: mufflers
 

Well Chris,with running mufflers my ears don`t ring after the races anymore. Also,I bracket race a lot,and an awful lot of tracks are requiring mufflers anymore due to subdivisions being built closer to racetracks. I kinda figured it was a headstart to the day it was manditory.

Re: mufflers
 

With mufflers you can run with the street car association on a Pro tree in ET categories that your car will fit . No traveling ,no big membership fee ,street gas , and so on . Sounds like fun to me.. Mike