Author Topic: Car back fires Now... is this normal? (Read 9374 times)

DragonSolGXP · « **on:** August 14, 2009, 10:13:54 AM »

Not sure where to put this post. Last night while doing some tests and playing around I noticed some backfiring. This is what I described to Lyndon:

---------------------
....took her out today and gave her a good run. She's still pretty wicked. VERY fast off the line. I noticed one think and I don't know if it has anything to do with the tune, or maybe it's just normal? But when going fast of the line and switching from 3rd to 4th, just about 6000 rpm when I let off on the gas to switch gears it back fires. Is this normal?
---------------------

Thought it might be the tune since that was the first time I noticed it. But Lyndon said it was the exhaust. So I'm getting that checked into. I had the Solo RDC exhaust installed at their shop about 4 weeks ago (something like that)... only have about 500-800 KM on it if that so it's not wear.

What do you think? Anyone else experiencing this?

I'm not blaming Lyndon, or Solo. Just trying to find the solution.

Rogue · « **Reply #1 on:** August 14, 2009, 10:31:51 AM »

Backfiring is typically caused by an exhaust leak. Fresh air is drawn in through the leak, mixes with any unburned fuel, and then ignites, creating the backfire. A new tune might slightly aggravate the condition, by introducing some additional unburned fuel, but that's pretty unlikely. Go back and make sure all your exhaust fittings are snug. Look closely at the turbo-to-cat union and also the cat-to-downpipe union. Hope this helps you out.

Jeff

DragonSolGXP · « **Reply #2 on:** August 14, 2009, 10:40:14 AM »

Thanks Jeff, That's what Lydon basically said. I'm thinking of getting the Solo Cat so I can get them to check this out when I'm there.

snaponbob · « **Reply #3 on:** August 14, 2009, 11:04:51 AM »

After a catless downpipe and high flow exhaust (MagnaFlow 3" plus Solo Performance 3" front pipe) with a Wester's tune, I can assure you that it isn't an exhaust leak causing the "backfire". Under heavy load and mid-high rpm sudden drop throttle you are cerftainly going to hear some popping and farting from the exhaust. Wait until you do a high flow cat !!!

Fun stuff. Don't forget to have Lyndon send you a new flash for the high flow cat.

Kelu · « **Reply #4 on:** August 14, 2009, 11:23:35 AM »

My Solo catless cat and 3" mach cat-back makes some pretty big backfires from time to time when I get of the gas and some rumbles more often than backfire.

I assumed this is all normal and I even enjoy it

This is supposed to be, right?

spicy3480 · « **Reply #5 on:** August 14, 2009, 12:39:10 PM »

When u add the HF cat or catless downpipe, you will get some backfiring under heavy load...that is normal. I get the same thing on my car and my entire system is welded.

lil goat · « **Reply #6 on:** August 19, 2009, 08:05:52 AM »

After several attempts I have resolved 95% of my backfire issue's I tightened the 2 band clamps (this one time at band clamp) at the rear after the muffler, then I put a sleeve on the 2 1/2 pipe before the muffler and 2 band clamps on either end of the sleeve, they are stepped band clamps, meaning one end is slightly bigger than the other. Then I carefully tightened the pipe at the downpipe so that both sides are evenly spaced. I get a backfire once in a blue moon, where as before I got them every time I did a high RPM shift, as those that were on the Solstice Run can a test. I am not talking about the burbling but a VERY loud backfire, if you are getting true backfires it is due to an air leak, the burble and sputtering farting is normal.

This is a stepped band clamp, I got it and the sleeve at Summit racing

The exhaust connector link, it was hard to find because I didn't know what to call it.
http://www.summitracing.com/parts/WLK-41964/

Uranium-238 · « **Reply #7 on:** August 19, 2009, 08:14:51 AM »

So, does this mean your car won't have flames shooting out of the exhaust now?

DragonSolGXP · « **Reply #8 on:** August 19, 2009, 08:53:15 AM »

Quote from: lil goat on August 19, 2009, 08:05:52 AM

After several attempts I have resolved 95% of my backfire issue's I tightened the 2 band clamps (this one time at band clamp) at the rear after the muffler, then I put a sleeve on the 2 1/2 pipe before the muffler and 2 band clamps on either end of the sleeve, they are stepped band clamps, meaning one end is slightly bigger than the other. Then I carefully tightened the pipe at the downpipe so that both sides are evenly spaced. I get a backfire once in a blue moon, where as before I got them every time I did a high RPM shift, as those that were on the Solstice Run can a test. I am not talking about the burbling but a VERY loud backfire, if you are getting true backfires it is due to an air leak, the burble and sputtering farting is normal.

This is a stepped band clamp, I got it and the sleeve at Summit racing
(Image removed from quote.)
The exhaust connector link, it was hard to find because I didn't know what to call it.
http://www.summitracing.com/parts/WLK-41964/

Thanks goat, I contacted Jeff at Solo and he said to drop by and they would take a look to make sure everything is fine. I'm actually thinking of getting the HF cat installed while I'm there but I'm not sure yet. He said that the noise level increases about 25%. Being 50 years old I'm already on the road to deafness (Thank you CCR, ACDC, Nazareth etc.) so I may not notice, but I don't want to speed up the process either

Anyway... yeah. The blurbling and fart is ok (on the car right?) I only get a backfire when I rev to around 6,000 rpm and shift. So it's not everytime.

Kelu · « **Reply #9 on:** August 19, 2009, 09:51:49 AM »

Now I'm confused. Spiky looks like one of the sealed system because he welded the connections and still have backfires.
Lil goat with some clamps succeed lower the number of backfires.
Need some more info

lil goat · « **Reply #10 on:** August 19, 2009, 09:58:41 AM »

The toughest connection to get to seal is where the exhaust attaches to the downpipe, I had to adjust it a couple of times to get it to seal. I also put some sealant on the joint, not sure if Spike welded this one or not, would make it very hard to pull the system if you welded it. I also tightened the band clamps again after driving a while. Backfires can be caused by a very very tiny pin hole of a leak, sometimes just a quarter turn of nut on clamp can fix it.

Kelu · « **Reply #11 on:** August 19, 2009, 07:15:25 PM »

Aye Aye Captain.
I hope I will have my exhaust checked in a couple of weeks.
Thanks for the info.

Bosch · « **Reply #12 on:** August 19, 2009, 07:45:05 PM »

Quote from: snaponbob on August 14, 2009, 11:04:51 AM

After a catless downpipe and high flow exhaust (MagnaFlow 3" plus Solo Performance 3" front pipe) with a Wester's tune, I can assure you that it isn't an exhaust leak causing the "backfire". Under heavy load and mid-high rpm sudden drop throttle you are cerftainly going to hear some popping and farting from the exhaust. Wait until you do a high flow cat !!! Fun stuff. Don't forget to have Lyndon send you a new flash for the high flow cat.

Hell just a muffler swap can give you lots of talking you never heard before.. Anytime you open up exhaust you will hear it talk more. Stock intake/exhaust are set up to be quiet, aftermarket stuff not so much..

But anytime you think you have a leak - check it out..

spicy3480 · « **Reply #13 on:** August 19, 2009, 07:55:25 PM »

Quote from: Kelu on August 19, 2009, 09:51:49 AM

Now I'm confused. Spiky looks like one of the sealed system because he welded the connections and still have backfires.
Lil goat with some clamps succeed lower the number of backfires.
Need some more info

I don't get backfires...I get the burbles. The two sounds are different...loud backfires mean small leaks, burbles are normal.

spicy3480 · « **Reply #14 on:** August 19, 2009, 07:56:43 PM »

Goat...I only welded the three connections where the band clamps are used. As for the downpipe connection, I just had it aligned perfectly and, as you did, used some gasket sealant for reassurance.

flyingfish · « **Reply #15 on:** October 07, 2009, 09:14:46 PM »

Too lean of an idle mixture has caused backfiring on vehicles I have.

kwtoxman · « **Reply #16 on:** October 07, 2009, 09:54:44 PM »

Bing. flyingfish has it right, more or less. A lean a/f ratio (too high, as in too much air) will cause backfire on engines when lifting throttle or on off throttle decelaration. My guess is the tune needs a little tweaking for that. No, it is not normal....

lil goat · « **Reply #17 on:** October 08, 2009, 07:53:19 AM »

If it is backfireing through the intake it may indeed be too lean and this can damage your engine, if it is through the exhaust it is an exhaust leak and this can damage your exhaust but is mostly just annoying as hell.

1LILNDN · « **Reply #18 on:** October 08, 2009, 11:34:15 PM »

[ Being 50 years old I'm already on the road to deafness (Thank you CCR, ACDC, Nazareth etc.) so I may not notice, but I don't want to speed up the process either ]

Dragon Sol GXP

You know what they say is When the Noise gets to LOUD Your getting to OLD. ( Music or Exhaust )thats me what did you say

Frank I · « **Reply #19 on:** October 09, 2009, 12:02:44 AM »

Quote from: DragonSolGXP on August 19, 2009, 08:53:15 AM

I'm actually thinking of getting the HF cat installed while I'm there but I'm not sure yet. He said that the noise level increases about 25%. Being 50 years old I'm already on the road to deafness (Thank you CCR, ACDC, Nazareth etc.) so I may not notice, but I don't want to speed up the process either

Anyway... yeah. The blurbling and fart is ok (on the car right?) I only get a backfire when I rev to around 6,000 rpm and shift. So it's not everytime.

DragonSolGXP:

I have Lyndon's hot tune and Solo Mach system and Hi-Flow Cat on a GXP and the High Flow Cat is not 25% louder. It is a bit more powerful sounding during accel runs, a little louder but not 25% louder during de-cel and about normal decibel levels during cruise conditions.

As for back fires, I have not experienced any backfires with the Hi-Flow Cat but do have burbles on de-cel. If yours is backfiring I would check the metal gasket connecting the stock Cat to the exhaust manifold and the gasket connecting the Cat to the Solo exhaust pipe. As for leaks at the clamps on the exhaust pipe, you can tell if the exhaust pipe clamps are leaking by looking for soot leaking out of the clamp ends. Hope this is of some help to you.

Frank I

DragonSolGXP · « **Reply #20 on:** October 09, 2009, 04:29:10 PM »

Hi Frank,
I got that 25% louder from Jeff at Solo. His shop (or one of them) is about 45 minutes away so I got my exhaust (and will get the cat) installed there. He said they would check for leaks and as you said, should be easy to find due to the soot.

This post makes it sound like it backfires all the time... happened maybe 2-3 time this summer. And it only happened when I was shifting at VERY high (readline) Revs.

Could be a minor leak, but it doesn't happen during "normal" shifting.

Frank I · « **Reply #21 on:** October 09, 2009, 09:51:16 PM »

Quote from: DragonSolGXP on October 09, 2009, 04:29:51 PM

Quote from: DragonSolGXP on October 09, 2009, 04:29:10 PM

Hi Frank,
I got that 25% louder from Jeff at Solo. His shop (or one of them) is about 45 minutes away so I got my exhaust (and will get the cat) installed there. He said they would check for leaks and as you said, should be easy to find due to the soot.

Dragon:

Yea that is typical Jeff, he is very cautious when quoting noise levels. Better for him to play it on the high side and then the customer will be pleased with it being quieter. I have had Jeff's Cat for about 2 years now and it has been trouble free. You can not go wrong with Solo's products nor their service. From my experience with them, they are top notch.

I also, like you, have a little loss of hearing. Mine from being around Jet propulsion all my life. If you get Jeff's high flow Cat, you will be very pleased with both performance and sound quality.

Frank

DragonSolGXP · « **Reply #22 on:** October 11, 2009, 09:58:02 PM »

Thanks Frank, yes I really like my solo exhaust. Top quality and service, Jeff told me to drop by for the cat and he'd check out the exhaust for a leak. I doubt he'll find any. I hope to get there before I put the car away.

Incidentally, I fly remote helicopters and have a 2 stage jet turbine in one. Nothing like the smell of jeta in the morning.

Especially like the way it winds up!

News:

Welcome Guest!!!

Author Topic: Car back fires Now... is this normal? (Read 9374 times)

lil goat

lil goat

lil goat