Thoughts about mufflers... - Hyundai Performance Forums

AKAHHM · 02-16-2003, 03:26 AM

well...i'm goin to order AEM CAI next week...
and...muffler....i have tons of quetions
well...hyundai dealer said i get warrenty void on engine parts if i do intake...
but they said mufflers are alright
well...
i'm goin to do custom piping...
but i was wondering...two small mufflers...or...one muffler with one piping straight from cat...well...i think with CAI it's goin to help alot..but...
since i'm not an expert i dont kno...
so plz answer my questions...

solo-baric · 02-16-2003, 03:36 AM

i'd just get one. 2 may give you to much back pressure. and the cai can only void parts on which it's related. like you suck up some wather your fault. you got a oil leak not your fault. things like that. that can only void parts on which it relates to.!

Mach5 · 02-16-2003, 09:45 AM

yes, def. get the intake, on the v6 it shows gains you don't want to be without for the money

**MechaniX_034** · 02-16-2003, 10:43 AM

For better results you may want to look into an upsized TB as well; for the exhaust, are you ging with 6-2-1 or a simpler[and more problematic to build] 6-2?

AKAHHM · 02-16-2003, 04:50 PM

well....
does TB give much hp?
i heard it gives better response...but...
for 350 bucks US...
it's too expensive
oh plus...if i do exhaust...is it better to do 3.0piping or...2.0 piping?
the company said 3.0L and above should order 3.0 pipes...and smaller ones 2.0 pipe...
well...tib is 2.7L...so...i dont kno...and i was wondering if the car gets more hp if muffler pressure is higher...i think that makes sense...but i want accurate answer...hehe...

[Edited by AKAHHM on Feb 16, 2003 1:35 PM]

Gundam · 02-16-2003, 05:50 PM

3 inch pipes if your going turbo
i say 2.5; what does every one else think

iQfOreVa · 02-16-2003, 08:14 PM

for a v6 you can go 3.0" cuz of the displacement...that's my opinion...anyway, you should also get a bigger throttle body...yes it increases throttle response, but it also increases the amount of air going into your motor. the best way to see optimal results is to do both the throttle body and intake manifold.

mattgolin · 02-19-2003, 04:42 PM

Since your car is N/A.
You should'nt go any larger than 1/2" more than the stock exhaust diameter.
eg. If you have piping of 2.0" OD (outside diameter) don't go any larger than 2.5"OD
You could also just go 1/4", 3/8" more. Going to large will hurt your cars performance.

Go either 3/8 or 1/2" larger since your engine is 2.7 liter. I'm not sure which would be better.

As far as a muffler:
I would advise against getting a strait through designed muffler eg. cherry bomb
A STD (strait through design) will give you maximum performance @ WOT (wide open throttle) and only at WOT.

You will lose torque at low rpms due to, too much of a decrease in back pressure.
They also sound weed-whacker-ish.....but if you like that kind of thing.

For normal driving you would be best off getting another muffler design (something that is not STD)

These have more back pressure than a STD (but less than your factory muffler)which will give you more power through the low/mid range rpm's. Instead of just at WOT.
These however will make less power at WOT than a STD muffler.

Thats the compromise you have to live with.

The choice is up to you......hope this helped.

qtiger · 02-19-2003, 05:44 PM

Quote:

Originally posted by mattgolin
[body]
I would advise against getting a strait through designed muffler eg. cherry bomb
A STD (strait through design) will give you maximum performance @ WOT (wide open throttle) and only at WOT.
[/body]

Maximum power at all RPMs will be given by a straight through muffler of the same size as your exhaust piping. Compensating for a too-large exhaust diameter with a restrictive muffler is foolish. The flow characteristics of an exhaust system are governed by the most restrictive part of the system.

Quote:

Originally posted by mattgolin
[body]You will lose torque at low rpms due to, too much of a decrease in back pressure.
They also sound weed-whacker-ish.....but if you like that kind of thing.

These have more back pressure than a STD (but less than your factory muffler)which will give you more power through the low/mid range rpm's. Instead of just at WOT.
These however will make less power at WOT than a STD muffler.
[/body]

Okay, first off... forget about back pressure, it has nothing to do with what you are talking about. Back pressure is 100% totally, absolutely worthless on a 4 stroke engine. Ideally, 0 backpressure is desired.

The culprit in this scenario is exhaust gas velocity. A large diameter, unrestrictive exhaust system will have immense flow potential (High cubic feet per minute or CFM of air), but will experience low exhaust gas velocity because (basically) the air has lots of room to move around in directions other than out your tailpipe. This causes poor flow at low RPMs but good flow at higher RPMs, where velocity is of lesser import than raw CFM.

Therefore, a compromise is reached in which the exhaust is sized for best all around flow (most area under the curve), which creates backpressure. It is a side effect of the design and not a desired result. If we could have high gas velocity, high flow, AND no backpressure... well, we could all burn our physics books. :rambo:

Rols · 02-20-2003, 04:20 AM

How about those straight through mufflers with silencer , does it make much difference in power if the silencer is on or out.