HDP

iTrader: (2)

I was taking my cousin for a spin in the FD yesterday on Winchester Rd. and opened it up on a long straightaway. Down shifted to 2nd and got up to about 7k, a big hesitation and BOOM... thick black smoke in the rearview mirror I was about to cry (really, I was). I pulled over at the next turn off and was shocked to hear the car running smooth. I shut it off and popped the hood and did a quick inspection and looked under the car for any coolant and/or oil. Everything looked normal and no unusual odors. So I started it again... everything checks out, nice smooth idle. So then I take off and now it accelerates harder and drives better than it did before... I'm dumbfounded

rx7racer11

thats weird sounds like you got lucky maybe you should check your air filter see if its insanely dirty or... just a thought

HDP

iTrader: (2)

Brand new air filter, barely a month old.

rynberg

*What are your mods?

*Did you have an almost empty gas tank?

*Did you happen to see what boost level you hit?

bploz RX7

maybe you just unclogged your cat/hi-flow cat with your spirited drive... does the exhaust tone sound any deeper?

BoOsTin FD

Maybe that boom was backfire. I have dp catback and hi-flo and sometimes when i redline it and change gear, and press Accelerator i hear a boom or pop or something from exhaust. I think that's a flame to be.

HDP

iTrader: (2)

I only have HKS dp and K&N drop-in filter, I think I was on 1/4 tank of gas, and the boost might have hit about 10 or 11.
The "boom" was a nasty metallic sound, that's why I thought I blew the engine.

rx7racer11

like bploz said does your car sound different you could have blown the packing out of your cat or muffler

SPOautos

Sounds like you need to change you plugs. How old and what plugs you running?

STEPHEN

HDP

iTrader: (2)

NGK. Plugs are barely a month old, maybe 700 miles on them.