jrbirch

Hey All,

I just bought a used RX8 (2005) with an aftermarket Greddy exhaust. Interesting thing: it "Pops" when I accelerate hard and then shift.

Is that normal?

nuke0907

iTrader: (2)

mine does it too. you should have someone follow behind you at night. i bet you shoot some nice flames out. you might not have a catalytic converter also.

RotaryMachineRx

iTrader: (1)

I have the GReddy SE exhaust on my car... just put it on last summer... with any aftermarket exhaust on the RX8 you get some nice back fire... even with a Cat. Without a cat you will shoot flames if your car is running hot enough... It's just a sweet Rotary thing

RotaryGuy904

yea, its just backfire.

jrbirch

Sweet. It causes an instant "Check Engine" light though with a Cat code. *grin*

Thanks for the reassurance!

RotaryMachineRx

iTrader: (1)

hmmm, thats a little odd, are you sure you have a cat? Mine doesnt throw any CEL's

tza0001

iTrader: (2)

This might be an indication of misfire. How many miles does the car have? Have you ever changed spark plugs, wires, and coils?

Spoolin8

iTrader: (2)

last time my engine light flashed at me i had a misfire and a new engine

RotaryMachineRx

iTrader: (1)

Yeah... To OP.. I would get that looked at

jrbirch

It hasn't had 4206F and it's in this week for the work. I suspect that's the issue.

Used, 2005 GT with 76K.

Dunno if it has a cat or not, but I presume it does. Dealer didn't mention anything when it went in for it's post-purchase checkup (bought it from a non-Mazda dealer...first thing, straight to the pros) and "missing catalytic converter" would be something they'd notice I think...

Nice to know that CEL w/ Cat is something to pay attention to even with the exhaust.

Thanks.

Lunacy

I love when my Borla pops.

lilring

iTrader: (11)

I feel like a little kid again when my setup pops. I smile everytime and laugh

the1jesster

Anyone know the exact reason why when we have an open exhaust our 8's go pop,pop when we shift?

rubberduckie

I think it is due to the incomplete burn of fuel in the combustion chamber. The combustion chamber in a rotary isn't as 'efficient' as that found in a piston engine and the pop is the fuel in the exhaust system being ignited.

I think.....

MarcMiller

iTrader: (1)

hearing this makes me want an exhaust even more!

gregs

iTrader: (7)

did someone say pop? i have a greddy too..lol
http://tinypic.com/player.php?v=15gupuw&s=5

MarcMiller

iTrader: (1)

gregs your cars nice as ****...i just watched ur dyno vids...sexy car man.

rodjonathan

iTrader: (6)

my auto doesnt pop but it still sounds awesome

jrbirch

I kinda wanna run behind the car when I'm shifting now...

And flames are awesome. Just awesome.