Straight pipes
 

I dont want anyones opinion on if this would look good or not. I want someone who knows what they are talking about to give me a straight answer. I am thinking about making a custom side exit exhaust with no muffler just right out of the exhaust manifold out the side of the car. Will this do any damage to my engine?

to your engine... no... to your ears from loudness and possibly body panels from flames shooting out... yes


i would not do straight pipes to the side... if your gonna do straight pipes, do it all the way back because since the sides are near the middle of the car, it will make it REALLY LOUD inside the cabin.

not to mention the smell! you would make yourself sick just trying to get to work in the morning.

alright. What do you think if i put a cat in there? any different or same results?

nope.. sorry, dont do side exhaust. i ran open exhaust after the cat for 2 days and the cabin was SOOOO loud with drone. if the exhaust exits near the middle of the car or underneath it, it just fills the cabin with noise. you wont like it! plus then you will have empty exhaust holes in your rear bumper?

what did a cat ever do to you that you want to stick one in a pipe with 1500 degree scorching heat?

put a cat in there and you're pretty much negating any gains you are trying to accomplish

why not have custom exhaust and straight that bad bow right out the center of the back bumper :Eyecrazy:

like right where the rotory symbol is on the back bumper I think it would look crazy

I think you should put zoomies straight up through the hood personally :lol2:

Nah, all the cool kids are routing the exhaust from the manifold to a 6" pipe that sticks straight out the front of their grill. flames shooting from there makes you gain like 50WHP due to intake heat pressurization and interflux designation.

I know this.

yes it will hurt you engine, epic fail saved

I still think an exhaust straight out of the middle of the back bumper would be uber tIIIIIIIIIIght :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:

noise isnt really a concern of mine considering this car is not a daily driver. its an 05 with 18000 miles on it. i guess your right about the exhaust holes though. i just want the sound. without an exhaust the car sounds so raw.

Have you heard it without exhaust?

Massive rasp...

A guy in our local club went for ultra-lightweight, decided to scrap the exhaust system.. He just put a pipe straight from the headers out the rear rotor accent in his bumper. It's plenty loud. Go do that, it's not expensive.

Remove your midpipe and drive for a day. You will be crying and your ears bleeding at the end of it. And most likely a ticket, too.

you'll see gains.
i've done it.


https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/different-kind-exhaust-modification-164090/

almost positive u will get a nice ticket for that one....also running straight from headers to side will have almost NO backpressure so any performance ur trying to gain it will not happen performance will just go down!!!! Now if yo do straight pipes to a Y pipe and split it and run it out the rear with a good resonator in there it may b better but I still dont' recommend it

wat

this stupid question has been asked before.

got an idea.

do it and get back to us on how it works!!!

beers :beer:

^^stupidest comment in the whole thread... no backpressure = less power? back pressure makes you moar faster and moar furiouser:banghead:

anyway, i say go for it... run a straight pipe however you decide to set it up and see how long you can take it before you decide it was a bad idea :) you said you just want the sound... you ever heard a rotary uncorked? and ppl think ricer fart cans sound bad and loud....

yea,

is it just me that notices this?????

beers :beer:

this stupid question has been asked before.

got an idea.

do it and get back to us on how it works!!!

beers :beer:

ok everyone that think ZERO backpressure is the best ride around with NO exhaust straight out of the MANIFOLD see how much power u have there and see how much fuel u use!

OP do it if u want to it's ur car not ours....

ok ppl.....now less backpressure will not DIRECTLY reduce power....however with less backpressure the motor will run more rich....we all know(or should know) that a 14.7:1 AFR is PERFECT now with smaller or no backpressure the motor will run rich....say10:1 or 9:1 something like that so without being able to adjust AFR (we are talking about a stock motor no AP or tuning device)

Now yes a slightly rich mixture like 12:1 will cause BETTER PERFORMANCE however running extremely rich will not increase performance....And we have no way of knowing how rich it is running without having an AFR gauge to keep an eye on it..

The motor will run rich which will of course burn more fuel. when the plugs ignite the entire Mixture is not burned up because of too much fuel so there is lots of fuel being dumped into the exhaust system..... Therefore SOME less backpressure YES will net more power because of a slightly rich mixture however Zero backpresure will burn more fuel and make an EXTREMELY rich mixture and will not NET ANY extra power...

Like i said running straigt from manifold is almost zero backpressure and an extremely rich mixture having straight pipes with a small resonator or Y pipe Xpipe and running out the back of the car will give enough backpressure to lower the AFR to a SLIGHTLY rich mixture and net more power....

i like the sound of an uncorked rotary as well.

i have a catless midpipe, combined with arguable the loudest catback exhaust out there, and i love it. it sounds great to me.

i think some people just need to toughen up.

There is not a piston engine made that can match the ear splitting scream of an uncorked rotary. When sound regulations first came into motorsports, it was due to racing rotaries.

...and that is why we drive the most awesome cars, ever.

Maybe, try 2.5 inch pipes to keep the noise quieter.

this thread is the perfect barometer to what kind of people are on this forum. It seems like anything cool here gets trashed. I want to know why if i ran it to the side its dumb but if i put it through the rotary accent its cool?

I have a MM AP. Rotaries run better pig rich

Also causes more carbon buildup and exhaust heat..

there is so much fail in this post. you clearly dont fully understand how the PCM uses fuel trims...

thats what i was getting at :)

if YOU think its cool, go for it. Your original question got answered, everything beyond that is our opinions. Take them or leave them

i think its dumb either way


afaik carbon buildup is mostly an effect of burning oil in the combustion chamber and has very little to do with AFR. also my understanding that given otherwise equal parameters, generally leaner = higher egt

^thanks but i understand how cars in general work and how the PCM works....but yall can do what u want i'm not going to fight and stroke ur Epeen!

OP it's ur car if u like it do what u want to it....ppl don't like my chrome wheels but i do and that's y i got them!

that is SO FLIPPING wrong i'm embarrassed for you.:spank:

man you are so deep in that hole if you dig any deeper magma is going to shoot out. just stop already.
:wallbash: :anger: :thumbsdow :slap:

there are more smilies and i WILL use them

because of the noise level as someone posted earlier.

that is close to being as wrong as 04rx8man. you cant be serious?:squint: :uhh:

boom shaka laka laka.

served.

damn zoom laying the smack all over the thread :)

um...:ftw:
..............huh...? :wtf::bsflag:

What the hell is going on in here?

I take a break for 2 days and all hell breaks loose!.

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/so-you-wanna-tuner-100333/

Wow, I'm late to the party on this thread. How I missed it I don't know.

Clearly there's a couple people in here that need to leave the tuning, and all information behind it, to those who have the complete understanding. I'd suggest not giving any tuning advice what so ever.

Thankfully the majority of the crowd around here are educated enough about tuning the RX8 to see through BS.

ok via straight from my school book Automotive Service by: Tim Gilles

"The desireable air/fuel mixture is about 15:1 which is about 9,000 gallons of air to 1 gallon of fuel. a normal a/f mixture for High power is about 12 parts to 1. This is a 12:1 mixture and is called rich. Maximum power ocurs from 12:1 to 12.5:1 AFR (called rich). the ratio for maximum economy is 15:1 to 16:1 called lean"

"A rich mixture results when there is too much fuel for the amount of air. 9:1 would b a rich mixture. A slightly rich mixture (12:1) for instance) will improve power but WILL result in fuel economy and increased exhaust emissions."

So this is straigt out of a 1600 page automotive service book please show me where i'im wrong about the AFR being rich will make more power but "pig rich" will not make more power...If this is wrong let me know I"m just trying to learn and this is what i have been taught! thank u

just a chart of fuel consumption with afr's and power performance with differnet AFR's

READ! I posted what you need to know.

ok i read it and a couple parts twice....so what i am saying about AFR is correct as u said that u want to b in the 11:1 to 12.5:1 area for best performance which is exactly what i was saying. Most in that thread is things I already knew but does not hurt to read up on them again and refresh myselft on the concept...

BTW MM nice write up

Uh, not. You aren't understanding what you are reading.

14.7:1 is stoichiometric.
13.3:1 or so is maximum power for an N/A app.

11.5:1 - 12.3:1 or so is for a BOOSTED application, though maximum torque will happen at the lean end of that range.

The flame front actually speeds up as the mix gets richer until the low 11's or so, then is slows down.

since I don't mind crapping in this collection of epic fail, Jeff mind if I send ya a PM?

ok so for a BOOSTED setup say i was tuning i want to see about 12.3:1 for maximum torque...

However for NA i want to see around 13.3:1 CORRECT?

Still trying to learn I now understand (I think) I was thinking for a Boosted setup not NA but either way somewhat more rich will net more power....

oh and however if i was seeing 11.5:1 on a boosted setup it would still b a safe range to b in as far as engine being sound and not running too rich or lean.....correct???