????back preasure????

[dowhatido]

ok......i have b18c1 in hatch, right now i have no muffler! my set up in my coupe was 4-1 header into 2 1/2" all the way back into greddy evo2 ( not cat, no pre-muffler). i went to track other day runnin very slow times 15.09 was best. i know it's back preasure,

q: is just puttin that muffler back on going to give me the preasure i'm lookin for or do i need to put something on b4 muffler to gain more back preasure??

q: should i change to a smaller canister'd muffler?

[Sol-Badguy]

..here comes that myth again

You don't need to calculate back pressure, you need to figure out what works best for the exhaust to exit at the maximum possible velocity.

Look it up.

[dowhatido]

meaning this is a trial and error type thing?

[bigdare23]

So you was the guy with the primer hatch that was loud as hell on sunday LOL!





Honestly I would go with a 2.5in exhaust with a high flow cat. I had experience with a str8 pipe to a muffler, and my car "felt" stronger with a more normal setup!

[dowhatido]

ya that was me.......lol, i was just at a muffler shop, this is an older guy who builder cars, i think he was givin it to me straight, but he told me just to put a power pack on it and that would shut it up and bring back the performance

[dowhatido]

So you was the guy with the primer hatch that was loud as hell on sunday LOL!





Honestly I would go with a 2.5in exhaust with a high flow cat. I had experience with a str8 pipe to a muffler, and my car "felt" stronger with a more normal setup!

what where u driving?

[bigdare23]

the multi-colored one LOL

[KevinT707]

IMO I don't think just a normal muffler will really add that much back pressure, if that's what you're looking for .. free flowing mufflers (the ones you can see right through) are pretty much for sound/looks only. The baffles on the inside of the walls quiet it down.

[dowhatido]

i see, but isnt the evo2 suppose to be performance?

[dowhatido]

the multi-colored one LOL

hell ya, will you be back out there for the importshowdown?

[bigdare23]

hell ya, will you be back out there for the importshowdown?

if I can get some tires by then LOL

[Hektik]

heres a good link on this site.... learn to use the search option it will come in very handy..
Back Pressure.. The Myth

[dowhatido]

hell ya, i didnt know none of that due to i'm still a noob when it comes to certain areas of the motor

[dowhatido]

and yes some of that was hard to follow, so i printed that and will review when not so busy.

also i see where now i need to be trying to make my power sence i have a vtec motor and i didnt know that my exhaust should be tuned for where i want my power. i have a 4cyl 1.8ltr....low end trq is not going to be my strong point w/out turbo but this is a start.

[KevinT707]

Exhaust doesn't really need as much thinking as you're putting into it. With a 1.6 or 1.8 Honda Motor then 2.25-2.5" mandrel bent tubing is your best bet. 2.5" will yield more power overall though!