When i'm really pushing the car, like when racing, between shifts i get a small pop backfire out the exaust. It only happens when i shift really fast, when i let up on the gas to shift, then put the gas to the floor. Only at WOT. I have a gutted cat, and 3" cat back. I get about .96 o2 in second gear, wich is a bit rich, but is this normal to have? I never got this when i had my stock injectors in. The car runs great, and pulls hard otherwise. Just wondering. Maybe i can lean it out some, but I just dont want to push that..

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

very normal..just means your running a little rich...better safe than sorry

HRC/Custom Stage 3 bla,bla
best run yet 13.2@110mph!!!!
15psi and alot of head work
www.Flawlessmotors.com

I believe this is normal when you're running rich, and if you have a test pipe or gutted cat. I also noticed more "pops" when I gutted my cat. It also made me worry at first.

___________
Kon C

"Sometimes, a man has to do what a man has to do."

I know it's normal for rx-7's to do that because they run rich, so I'm assuming its ok

turbo8u: "jiggle jiggle then vroom vroom pshhhh"
-Mike Pruett
2gnt member# 976
MOPAR Stage 2
SRTForums.com member #37 (Yeah, I signed up when it first came out, and ended up getting one, cool huh?)
"The object of war is not to die for your country but to make the other bastard die for his."
- General George Patton (1885-1945)

heh not only do they run really rich they run extremely hot

anyway I"m running freakishly rich and I don't get pops even when autoxing or racing, it could be your misfiring. How much boost your running? Then again I have a cat and my engine is pretty jacked up so I doubt it will ever detonate unless I run out of fuel

http://www.hadesomega.info -car specz and movies 95 Eclipse RS | 76' 280Z | 89' MR2 | 99 Neon | 91 Zephyr
Who sez FF can't drift?

What about backfiring when slowing down?

(not trying to steal your thread Matt)

Thanks for the help guys, yeah i thought it was fairly normal, as i am running a bit rich i suppose. Like i said though, it ONLY happens when i shift really quick, where there is just very quick letting off the gas then back on it between shifts. If i reach full boost, then shift a tad slower, its not there. It doesnt do it if i just back off the gas either...Matt, i think you have pretty much the same issue as i do..prob just running to rich.. Its just unburnt, leftover fuel igniting..

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

When my tranny shifts, there's a 'fart' like flutter. I'd assume it's the same reason?!?!?

Kris
"Someday............I'll have traction problems!!!!"
Tampa, FL
Pinoy Turbo 2GNT

1999 HRC Turbo RS
Stage 2
Auto with BOOST!!!!!!!!!!!!

with my gutted cat my car will backfire whenever I shift like you do, but only on the 1-2 shift. You should have somebody ride around behind you so they can tell you what the flames look like, I thought it was kinda cool when I found out that I shot big blue flames out my exhaust.

Are you sure that your car is backfiring as your slowing down?? I get a kind of gurgle while slowing down while my car is in gear but it is definitely quiter than when the car backfires.

Robo, one of the guys in my car club gets a fluttering sound when he is getting on it and his tranny shifts too. Hes the only auto in the club, so I dont know if that is normal or not. He is a chrysler tech though and he said he has checked everything out and all is fine. If you want to talk to him about it just email me and I will give you his contact info.

Toney
'97 RS 5 Speed (totaled)
15.4606@88.42 Mph
96 Toyota Celica GT
88 Toyota Supra NA-T (w/ sports package)
Got Boost?? Hell yeah I-6 turbo powah baby!

>>>Are you sure that your car is backfiring as your slowing down?? I get a kind of gurgle while slowing down while my car is in gear but it is definitely quiter than when the car backfires<<<


Good point. Let me rephrase that. When I slow down in gear my exhaust "pops" I guess it's not really backfiring like you guys are talking about. Probably because there is a lot less fuel.