afterfire or backfire?

JB1 · 12-30-2009, 07:45 PM

HFC's + Takeda intake = lots of burble...

MrBMW · 12-30-2009, 08:58 PM

Quote:

Originally Posted by gleonard

it's not any louder than the rest of the exhaust note, it just sounds out of place. It goes from a growl to a gurgle back to a growl.

As others have said it sounds perfectly normal. For myself i have the G3 Intakes, with the FI RTP's/18" Res and CF Muffler. To be honest it really is one of the best parts of the sound LOL. Especially accelerating hard in to a tunnel and then just lift off the accelerator. I absolutely LURVE it.

gleonard · 12-31-2009, 02:36 AM

Quote:

Originally Posted by MrBMW

As others have said it sounds perfectly normal. For myself i have the G3 Intakes, with the FI RTP's/18" Res and CF Muffler. To be honest it really is one of the best parts of the sound LOL. Especially accelerating hard in to a tunnel and then just lift off the accelerator. I absolutely LURVE it.

I have the FI TDX CBE 18"resonators w/polished mufflers. The rest of the exhaust sound is so exotic that the burble sounded a bit out of place. It doesn't bother me, however it isn't my favorite sound.

Minicobra1 · 12-31-2009, 03:56 AM

Yes, it is somewhat normal, Berk CBE + Berk HFC gets the burble too.

My Mini Cooper does it too, check out the video on this one:

A couple links on articles, not sure how accurate they are:

Exhaust Burble Causes | eHow.com

eBay Guides - Exhaust Pipe Diameters

Modshack · 12-31-2009, 10:45 AM

Quote:

Originally Posted by Minicobra1

A couple links on articles, not sure how accurate they are:

Exhaust Burble Causes | eHow.com

eBay Guides - Exhaust Pipe Diameters

Yeek...More bad info on the internet. I wouldn't put too much stock in either of those 2 links though there is a little truth in the second.

Most cars, due to emissions, now have complete fuel cuts when you close the throttle. This immediate transition to lean will cause the burble and snapping depending on exhaust design and back pressure. On my old ('08) Corvette you could tune this out with software by turning off the fuel cut and allow some fuel and combustibility into the system even on closed throttle. The more even burn did away with the burble and snap/crackle..It was all very tunable. Opening or closing the Exhaust flappers had an impact too.

spearfish25 · 12-31-2009, 04:40 PM

Quote:

Originally Posted by Modshack

Yeek...More bad info on the internet. I wouldn't put too much stock in either of those 2 links though there is a little truth in the second.

Most cars, due to emissions, now have complete fuel cuts when you close the throttle. This immediate transition to lean will cause the burble and snapping depending on exhaust design and back pressure. On my old ('08) Corvette you could tune this out with software by turning off the fuel cut and allow some fuel and combustibility into the system even on closed throttle. The more even burn did away with the burble and snap/crackle..It was all very tunable. Opening or closing the Exhaust flappers had an impact too.

Race cars burble like crazy. I assume they don't care about emissions though. Is it more exhaust design then?

Anyone getting burble with the Stillen CBE and Berk HFCs together? I have the Stillen CBE alone and there is only a hint of burble.

gumpy · 03-09-2010, 04:59 AM

Quote:

Originally Posted by spearfish25

Race cars burble like crazy. I assume they don't care about emissions though. Is it more exhaust design then?

Anyone getting burble with the Stillen CBE and Berk HFCs together? I have the Stillen CBE alone and there is only a hint of burble.

Yeah I'd love to know what type of exhuast gives you the lift off crackle. I don't necessarily want a louder exhaust but a freer flowing one with over run crackle and pops would be awesome.

12-30-2009, 07:45 PM	#1 (permalink)
JB1 Track Member Join Date: Mar 2009 Location: Chicagoland Posts: 748 Drives: 09 Nissan 370Z sold Rep Power: 19	HFC's + Takeda intake = lots of burble... __________________ Black Fangs // Black rear Valance // Berk CBE // COBB post MAF tubes // K&N drop in filters // Setrab Oil Cooler // Stillen Sway bars // Z1 SS brake lines // Stillen brake cooling kit // Harness bar //

12-31-2009, 03:56 AM	#4 (permalink)
Minicobra1 A True Z Fanatic Join Date: Nov 2008 Location: Orange County, CA. Posts: 1,205 Drives: 370Z Tour, Spt, 6mt Rep Power: 646	Yes, it is somewhat normal, Berk CBE + Berk HFC gets the burble too. My Mini Cooper does it too, check out the video on this one: A couple links on articles, not sure how accurate they are: Exhaust Burble Causes \| eHow.com eBay Guides - Exhaust Pipe Diameters __________________ 370z Tour\| Spt Pack\|Navi\|BERK CBE\|Berk HFC's\| Eibach Springs\| Hotchkis Sway Bars\|SPC Camber Arms\|15mm Ichiba Wheel Spacers\| 19"Factory Nismo Wheels-Matt Black\|Stop Tech Rotors\|TWM Shifter\|3M Tint\|Black Fangs\|Black Rear Valance\|JDM Fog Light\| MY BAND-www.myspace.com/petroleum