Exhaust problems - LotusTalk

keith86a · 08-28-2005, 12:09 PM

I strated having problems with my exhaust soon after the 1k service. Not sure if there is any connection. In general, the exhaust became a lot more loud and started to make weird sounds. For example, when I let off gas I hear a very loud noise coming from the exhaust, along with popping sound. Sounds something like "VOOM pop pop pop VOOOM pop pop". When I touch the gas pedal even slightly, the sound dissapears. I would think that its at least 3 times more loud than normal, it definitly wasnt doing that before. What the heck happened? I have forcedfed turbo/exhaust for the record. Should I take the car to service? Or another solution I have is to put argray twin tip exhaust which I recently got in the mail. I also think that my car started to stall more. Any help would be appreciated.

char · 08-28-2005, 06:51 PM

Take it in.

When my stage II seemed to get louder I took it to the dealer. They located a crack and replaced it.

SEBM · 08-28-2005, 07:00 PM

Thats just backfiring, thats totally normal, my elise does it ALL the time and my supra does it after high revs run REALLY loud.

-Seb

keith86a · 08-28-2005, 07:14 PM

"Thats just backfiring, thats totally normal, my elise does it ALL the time and my supra does it after high revs run REALLY loud."

Thats what I thought it was at first, however, why did it suddently start doing that after 1700 miles? All of a sudden, I start it up one day and it gets at least 3 times more loud! If it was doing that since the beginning, I wouldnt have any problem. If I didnt know any better I would say that the dealer took of my cat when my car was at their service or something. Maybe char is right and I do have a crack, how dangerous is it? If I do have a crack, will replacing it with argray exhaust fix the problem?

scottyb · 08-28-2005, 07:56 PM

One of the service guys in New England said that up to 90% of Stage 2 exhausts fail. I would take it in.

Ruediger · 08-29-2005, 04:17 AM

Valve- timing ( overlap fresh- / exhaust gas valves ) changed ?

SEBM · 08-29-2005, 05:07 AM

Well if its after the 1k service you only started pushing the car AFTER right

But seriously I dont know why it wouldve started doing it all of a sudden, but how you describe it, I doubt it's anything of concern...but, just to make sure, you should get that new exhaust

-Seb

jtanner · 08-29-2005, 08:02 AM

Did Lotus reflash your ECU at the 1k service? Could that have thrown ForcedFed's maps off?

Jim

psionix · 08-29-2005, 08:43 AM

this might help:
Wastegate Flutter - Not bad, normal on turbocharged cars.
Compressor Surge - Bad.
Gaseous Cavitation - Not bad, normal on turbocharged cars with high flow FMICs under certain boost conditions.

keith86a · 08-29-2005, 05:07 PM

Just dropped my car off at Prestige, I was told by forcedfed that they need to tighten some bolts that may be coming loose at the exhaust manifold. I was told this sometimes happens with turbo cars and is an easy fix.

JeffersonRaley · 08-29-2005, 05:14 PM

Quote:

Originally Posted by keith86a

n general, the exhaust became a lot more loud and started to make weird sounds. For example, when I let off gas I hear a very loud noise coming from the exhaust, along with popping sound. Sounds something like "VOOM pop pop pop VOOOM pop pop".

Almost certainly an exhaust leak at a join. My Arqray made all sorts of popping noises until I got it to seal well. Now it only talks back on overrun.

08-28-2005, 12:09 PM	#1 (permalink)
keith86a Registered User Join Date: Nov 2004 Location: Miami, FL / Boston, MA Posts: 1,322	Exhaust problems I strated having problems with my exhaust soon after the 1k service. Not sure if there is any connection. In general, the exhaust became a lot more loud and started to make weird sounds. For example, when I let off gas I hear a very loud noise coming from the exhaust, along with popping sound. Sounds something like "VOOM pop pop pop VOOOM pop pop". When I touch the gas pedal even slightly, the sound dissapears. I would think that its at least 3 times more loud than normal, it definitly wasnt doing that before. What the heck happened? I have forcedfed turbo/exhaust for the record. Should I take the car to service? Or another solution I have is to put argray twin tip exhaust which I recently got in the mail. I also think that my car started to stall more. Any help would be appreciated.

08-28-2005, 07:00 PM	#3 (permalink)
SEBM Registered User Join Date: Mar 2005 Location: Port St Lucie, FL Posts: 253	Thats just backfiring, thats totally normal, my elise does it ALL the time and my supra does it after high revs run REALLY loud. -Seb __________________ -Seb 2005 Lotus Elise LSS - Chrome Orange - Fully Loaded(LSS, Touring, Hard Top) - Not Stock 1994 Toyota Supra TT - Rennaissance Red - Mod list is too long - 1300+hp 2007 Mini Cooper S - Chili Red - Beater/Family Mobile

08-28-2005, 07:14 PM	#4 (permalink)
keith86a Registered User Join Date: Nov 2004 Location: Miami, FL / Boston, MA Posts: 1,322	"Thats just backfiring, thats totally normal, my elise does it ALL the time and my supra does it after high revs run REALLY loud." Thats what I thought it was at first, however, why did it suddently start doing that after 1700 miles? All of a sudden, I start it up one day and it gets at least 3 times more loud! If it was doing that since the beginning, I wouldnt have any problem. If I didnt know any better I would say that the dealer took of my cat when my car was at their service or something. Maybe char is right and I do have a crack, how dangerous is it? If I do have a crack, will replacing it with argray exhaust fix the problem? Last edited by keith86a : 08-28-2005 at 07:35 PM.

08-29-2005, 05:07 AM	#7 (permalink)
SEBM Registered User Join Date: Mar 2005 Location: Port St Lucie, FL Posts: 253	Well if its after the 1k service you only started pushing the car AFTER right But seriously I dont know why it wouldve started doing it all of a sudden, but how you describe it, I doubt it's anything of concern...but, just to make sure, you should get that new exhaust -Seb __________________ -Seb 2005 Lotus Elise LSS - Chrome Orange - Fully Loaded(LSS, Touring, Hard Top) - Not Stock 1994 Toyota Supra TT - Rennaissance Red - Mod list is too long - 1300+hp 2007 Mini Cooper S - Chili Red - Beater/Family Mobile

08-29-2005, 08:02 AM	#8 (permalink)
jtanner Registered User Join Date: Jul 2004 Location: Atlanta, GA USA Posts: 643	Did Lotus reflash your ECU at the 1k service? Could that have thrown ForcedFed's maps off? Jim __________________ 2005 Ardent Red--Sport Pack--Hard Top

08-28-2005, 06:51 PM	#2 (permalink)
char 926 Join Date: Feb 2005 Location: Chicago Posts: 232	Take it in. When my stage II seemed to get louder I took it to the dealer. They located a crack and replaced it.

08-28-2005, 07:56 PM	#5 (permalink)
scottyb Registered User Join Date: Dec 2004 Posts: 3,683	One of the service guys in New England said that up to 90% of Stage 2 exhausts fail. I would take it in.

08-29-2005, 04:17 AM	#6 (permalink)
Ruediger Registered User Join Date: Mar 2004 Posts: 321	Valve- timing ( overlap fresh- / exhaust gas valves ) changed ?

08-29-2005, 08:43 AM	#9 (permalink)
psionix freakout! Join Date: Jul 2005 Location: STL Posts: 264	this might help: Wastegate Flutter - Not bad, normal on turbocharged cars. Compressor Surge - Bad. Gaseous Cavitation - Not bad, normal on turbocharged cars with high flow FMICs under certain boost conditions.

08-29-2005, 05:07 PM	#10 (permalink)
keith86a Registered User Join Date: Nov 2004 Location: Miami, FL / Boston, MA Posts: 1,322	Just dropped my car off at Prestige, I was told by forcedfed that they need to tighten some bolts that may be coming loose at the exhaust manifold. I was told this sometimes happens with turbo cars and is an easy fix.

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