what's happening?

p1na1pr1nc3ss · 03-20-2004, 02:06 AM

okay, so i recently installed an exhaust and downpipe on my car about 3 days ago

... yesterday my CEL came on and am on my way to fixing that... now today i took a ride up to north jersey and was joy riding on 287 with a friend in his type-s... we started racing and took it up to about 130 mph and then my exhaust started to pop. it did it about 3 times, 2 times in a row... my boyfriend says i'm detonating... but how so if i didn't do much to my car yet... is this popping noise detonation? and if so why?... did this happen to anyone that has installed an exhaust and downpipe? would like some info... thanks! :P

Slowride · 03-20-2004, 05:19 AM

No, that's not detonation...that sounds like backfiring. Don't know how common it is with exhaust+dp, but it's probably harmless. Does it happen under throttle or when you let off?

Is is possible you're having boost creep? Do you have a boost gauge? The CEL could be due to overboost. If that's the case, it's a serious problem that needs to fixed by porting the wastegate.

thermobox · 03-20-2004, 07:05 AM

port the wastegate and get an ebc/mbc

renichms · 03-20-2004, 08:10 AM

Popping isn't detonation. The sound clip I was given of detonation sounded like BB's being rapidly fired into a metal can of some sort.

RN

p1na1pr1nc3ss · 03-20-2004, 09:18 AM

the popping happens at high rpms at like 5 1/2, but i didn't race anymore after the 2nd and 3rd pops...

***eatV8*** · 03-20-2004, 11:12 AM

i say you had boost creep, my friend has downpipe only and got creep around 130-135mph at full throttle in 6th. did the car stop pulling when it started to backfire like u just hit a speed limiter?

Vader2k · 03-20-2004, 11:20 AM

Yeah, sounds like boost creep. Port the wastegate like Thermobox mentioned.

Singletrack · 03-20-2004, 01:02 PM

With a highflow exhaust in a lot of cars you will get popping when you lift off the throttle. Do you have a boost gauge? If your boost creeps up to a certain point the ECM will basically cut power which is probably what caused the popping.

-st

p1na1pr1nc3ss · 03-20-2004, 04:26 PM

no i didn't buy a boost gauge yet... gauges are my next purchases... i just spent a lot of money on the first package... but it'll be on the way... by any chance, has anyone put on a blow-off valve on their car yet? i heard on the STI the blow-off valve is mounted on the intercooler.

***staticx313*** · 03-20-2004, 04:43 PM

Yes... well since you dont have a boost gauge I'd recommend not flooring it in 4th gear or more unti lyou find out if you're boost creeping or not (for safety reasons). I have the Worx Tuning dual stage BOV. Yes the BOVs go on the intercooler

. Very easy install and some pretty good performance increase if you are becoming more and more modified.

Robert~

03-20-2004, 02:06 AM	#1
p1na1pr1nc3ss Amateur STI Driver Posts: 8 IWSTI Addict since: Dec 2003 Trader Rating: (0)	okay, so i recently installed an exhaust and downpipe on my car about 3 days ago ... yesterday my CEL came on and am on my way to fixing that... now today i took a ride up to north jersey and was joy riding on 287 with a friend in his type-s... we started racing and took it up to about 130 mph and then my exhaust started to pop. it did it about 3 times, 2 times in a row... my boyfriend says i'm detonating... but how so if i didn't do much to my car yet... is this popping noise detonation? and if so why?... did this happen to anyone that has installed an exhaust and downpipe? would like some info... thanks! :P This ad is not endorsed by this member. Please register or login to hide this ad.

03-20-2004, 08:10 AM	#4
renichms Professional STI Racer Car: 2004 Subaru Impreza Location: Birmingham, Alabama Posts: 651 IWSTI Addict since: Oct 2003 Trader Rating: (0)	how about this one Popping isn't detonation. The sound clip I was given of detonation sounded like BB's being rapidly fired into a metal can of some sort. RN

03-20-2004, 09:18 AM	#5
p1na1pr1nc3ss Amateur STI Driver Posts: 8 IWSTI Addict since: Dec 2003 Trader Rating: (0)	break in trip pleaseeeeeeeeee the popping happens at high rpms at like 5 1/2, but i didn't race anymore after the 2nd and 3rd pops...

03-20-2004, 04:43 PM	#10
*staticx313* Platinum Member Car: 05 Subaru WRX STI CG Fav Mod: 3" FP20G - 403WHP/417WTQ Location: Huntsville, AL Posts: 5,274 IWSTI Addict since: Aug 2003 Trader Rating: (2)	Addition to Air Box Hack Mod - more air(?) and more sound Yes... well since you dont have a boost gauge I'd recommend not flooring it in 4th gear or more unti lyou find out if you're boost creeping or not (for safety reasons). I have the Worx Tuning dual stage BOV. Yes the BOVs go on the intercooler . Very easy install and some pretty good performance increase if you are becoming more and more modified. Robert~ This ad is not endorsed by this member. Please register or login to hide this ad.

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03-20-2004, 05:19 AM	#2
Slowride Spec C Club Location: East Tennessee Posts: 1,025 IWSTI Addict since: Oct 2003 Trader Rating: (0)	No, that's not detonation...that sounds like backfiring. Don't know how common it is with exhaust+dp, but it's probably harmless. Does it happen under throttle or when you let off? Is is possible you're having boost creep? Do you have a boost gauge? The CEL could be due to overboost. If that's the case, it's a serious problem that needs to fixed by porting the wastegate.

03-20-2004, 07:05 AM	#3
thermobox Spec C Club Posts: 2,021 IWSTI Addict since: Nov 2003 Trader Rating: (0)	port the wastegate and get an ebc/mbc

03-20-2004, 11:12 AM	#6
*eatV8* retired mod Car: 99 WRX STi V5 Fav Mod: JDM Air Freshener Location: Brisbane, Australia Posts: 3,861 IWSTI Addict since: Apr 2003 Trader Rating: (0)	i say you had boost creep, my friend has downpipe only and got creep around 130-135mph at full throttle in 6th. did the car stop pulling when it started to backfire like u just hit a speed limiter?

03-20-2004, 11:20 AM	#7
Vader2k Grassroots STI Racer Car: See extras... Fav Mod: I am a professional Badass, who likes to live life by the edge. Location: Sacramento, CA. Representing the 916! Posts: 541 IWSTI Addict since: Jul 2003 Trader Rating: (0)	Yeah, sounds like boost creep. Port the wastegate like Thermobox mentioned.

03-20-2004, 01:02 PM	#8
Singletrack Spec C Club Car: 04 Impreza WRX STi Fav Mod: La Quarta Stella Location: Blitzburgh, PA Posts: 1,440 IWSTI Addict since: Sep 2003 Trader Rating: (2)	With a highflow exhaust in a lot of cars you will get popping when you lift off the throttle. Do you have a boost gauge? If your boost creeps up to a certain point the ECM will basically cut power which is probably what caused the popping. -st

03-20-2004, 04:26 PM	#9
p1na1pr1nc3ss Amateur STI Driver Posts: 8 IWSTI Addict since: Dec 2003 Trader Rating: (0)	no i didn't buy a boost gauge yet... gauges are my next purchases... i just spent a lot of money on the first package... but it'll be on the way... by any chance, has anyone put on a blow-off valve on their car yet? i heard on the STI the blow-off valve is mounted on the intercooler.