oppinion on Quad exzos

[izam171]

Hi sifus out there..im planning to change my rear bumper n exzos system to the quad system...just want to know from u guys,izit ok to just change the rear bumper,n maintain the front bumper,mine is m tech 2...will it look funny or stupid doing this?and,1 of my fren said that the car will lose power using the 4 exzos,and the computer box will have problem adapting to it.i actually go for looks rather than performance,so what u guys think about the quads?

 

[joeylow]

Quad exhaust and bumper

I think it should be O.K, because you normally cannot see both bumpers at the same time. It is either the front or the back. Tapi i find the rear quad exhaust bumper garang and the Msport front is sporty but not garang enough. As for the quad exhaust it is just a piping change from you rear muffler so there will not be a performance gain or loss.

Joey Low

 

[izam171]

thanks Joey,hmm....

 

[izam171]

hmm,no one wanna share their ideas???

 

[kor-yong]

Don't do it ... If you must do some "for-show" mods on a Beemer, keep it original & subtle ... :wink:

 

[ess530i]

unless u got 400hp or more to exhaust out i think u shud stick to dual ones

 

[cHeMiCaL_]

i dont mind quad ext... looked good to me compared to the mundane dual ones...

 

[lingzhi]

as for me, twin pipes are good enuf... quad pipes are more for M wannabes.

no pun intended.

 

[turbology]

If you are just into looks:
split the muffler up to 2 feet before the muffler should be fine. Performance lost is not significant.
If you have more than 1 cat, split after the last cat.
If you have OBDII downstream oxygen sensors, split 1 feet after the sensor.

 

[B33mEr]

Go for it bro :top::top::top: not only it looks wicked but with the proper setup will sound orgasmico bro :top:
For reference here's a setup by OSS from e46fanatic.com

Simple, elegant and effective :top:

 

[lingzhi]

Don't do it ... If you must do some "for-show" mods on a Beemer, keep it original & subtle ... :wink:

yup... :top:

 

[wan syahmi]

for the picture, nice look, but power loss because not enough back pressure..

 

[turbology]

power loss because not enough back pressure..

No such thing as "not enough back pressure"

 

[B33mEr]

for the picture, nice look, but power loss because not enough back pressure..

lol ... pls explain bro ... this should be interesting

 

[viper497]

yup i need more explanation of the back pressure have not heard about it :tomato::tomato:

 

[turbology]

yup i need more explanation of the back pressure have not heard about it :tomato::tomato:

Google it :http://en.wikipedia.org/wiki/Back_pressure

 

[JOKER]

scientific & engineering idea

wrong type, wrong size of exhaust could effect the engine 's thermodynamic efficientcy together with it 's power develope,

small exhaust would cause the heat accumulated/slower heat flow from engine, cause the DME to spray less fuel, that mean less power

if exhaust too big, it would cause too much heat loss from engine...; the DME would try to recover the heat loss by spraying much more fuel but cannot meet the perfect thermodynamic to preduce efficient power!!! not very good for N.A. engine

BIG exhaust is good for TURBO CHARGED engine, where the turbine need much differential pressure from the exhaust header to the exhaust TIP.. bigger is better for turbo charged!!!, bigger differential higher velocity flow in the turbine
create higher boots pressure in the compressor!!!,... NOTE: No use for SUPERCHARGE!!! :34: :52:

big engine capacity would be fitted with big exhaust, justlike M3 3.2L with Quad exhaust..

most of the after market exhaust and header such as the supersprint design for smooth flow,
the gas flow in the exhaust, not the size of exhaust..., to reduce back pressure

 

[JOKER]

for the picture, nice look, but power loss because not enough back pressure..

:stupid: power loss because of back pressure la... :driver: :banghead: :34:

no wonder how i never saw BMW action in KL DRIFT :hmmmm:

who are you??
you is manager??, DATUK-datuk ???, engineer??, scientist???, Professor??, businesman??
movie star??, or just rich-rich man???

 

[B33mEr]

interesting write up on the effect of exhaust setup on DME ... i didnt know that it would cause the DME to alter it's A/F ratio to maintain thermodynamic efficiency base on the exhaust valve pressure inside the engine and on to the exhaust pipe. I guess thats one of the many function of the o2 sensor ... Am i rite to assume that is the case?

 

[JOKER]

interesting write up on the effect of exhaust setup on DME ... i didnt know that it would cause the DME to alter it's A/F ratio to maintain thermodynamic efficiency base on the exhaust valve pressure inside the engine and on to the exhaust pipe. I guess thats one of the many function of the o2 sensor ... Am i rite to assume that is the case?

Hey dude, the BMW 's DME is big different from the NORMAL ECU...,

THE DME is a micro computer, i repeat MICRO COMPUTER!!!! it was COMPUTER and had intergrated software to run it, just like you play a computer game, the enemy in the game was run by computer with various AI logic that was very smart

the software in the DME was an engineered calculation (thermodynamic.., alot more)
different software for the M50 cast iron engine and M52 aluminium-magnesium engine...,
two different thermodynamic environment

all the sensor hooked up for the accurate micro-computer calculation, that why my bmw suck
RM 11-13 perday with aluminium alloy 6-barrel 2.8caliber compare to RM10 perday for the HERO 's 4-barrel 1.3 caliber, that was big different!!!

and that why once you had upgrade the exhaust, you will need new and accurate DME software
program (the formula) for the exhaust..., if not ... the M3 gonna lose to the WRX STi again...

All these was german langue and computer software programming