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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Dec-17-2019, 09:41:29 PM   #41
Drewster
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Default Re: Burbles/Flames- harmful to motor?

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Originally Posted by terraphantm View Post
Hmm, controlling the pops based on EGT (which are cars do monitor and actually model as well) is an interesting thought. But I don't care for the pops so...
Yup, and with no performance benefit for NA cars, you'd just be adding a little safety blanket to a group of people who don't really care about safety and longevity

The crazy part about cars like the RS is they infer all of that based on just a handful of sensors - they don't have actual EGT sensors like we do
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Old Tue, Dec-17-2019, 10:58:56 PM   #42
sapote
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Default Re: Burbles/Flames- harmful to motor?

Just add an external speaker and play the recorded noise that you like; cheap, safe, and easy.
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Old Tue, Dec-17-2019, 11:26:39 PM   #43
terraphantm
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Default Re: Burbles/Flames- harmful to motor?

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Yup, and with no performance benefit for NA cars, you'd just be adding a little safety blanket to a group of people who don't really care about safety and longevity

The crazy part about cars like the RS is they infer all of that based on just a handful of sensors - they don't have actual EGT sensors like we do
Yeah it's pretty crazy what modern ECUs can do when they have an accurate model of the motor. Of course in some ways that does make modding tougher, since so many functions depend on that internal model of the motor being accurate rather than relying on sensor data.

I have heard of some cars (Evo comes to mind) using the secondary air pump to get the cracks / pops. As an antilag measure, but I imagine it would work here as well. I wonder if that would be any safer than what current tunes do (which I think is just dumping a bunch of extra fuel and advancing the exhaust cam?)
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Old Wed, Dec-18-2019, 12:38:47 AM   #44
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Default Re: Burbles/Flames- harmful to motor?

To help pulling raw fuel into hot exhaust for the sound effect, I would think the EX cam needs to retard and the IN cam is advanced to have cross flow; advancing the EX valves open doesn’t help in this regard. So at the end of the exhaust cycle with piston at TDC the EX valves still open (retarded) and IN valves opened advanced with fuel injected. So the exhaust flow momentum helps pulling fuel into the hot exhaust pipes for the crackle and burble noise.
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Old Wed, Dec-18-2019, 02:57:30 AM   #45
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Default Re: Burbles/Flames- harmful to motor?

There's two sides to it. I have friends who own dove gray smg cars with paddle extensions and ebay headers. Stage 3 burble tune and all. They have tons of fun and good reliability so far. I think it's dumb.

They think I'm dumb with $3000 airboxes and SS headers. "Dude you gotta get a burble tune it's so sick I shoot flames!!!!"

My Paul Claude tune will make cool noises on occasion, if I'm really going for it.
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Old Wed, Dec-18-2019, 03:13:02 AM   #46
terraphantm
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Default Re: Burbles/Flames- harmful to motor?

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To help pulling raw fuel into hot exhaust for the sound effect, I would think the EX cam needs to retard and the IN cam is advanced to have cross flow; advancing the EX valves open doesn’t help in this regard. So at the end of the exhaust cycle with piston at TDC the EX valves still open (retarded) and IN valves opened advanced with fuel injected. So the exhaust flow momentum helps pulling fuel into the hot exhaust pipes for the crackle and burble noise.
My understanding was that they advance the exhaust cam so that some of the combustion flames actually go down the pipes.
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Old Wed, Dec-18-2019, 03:28:12 AM   #47
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Default Re: Burbles/Flames- harmful to motor?

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There's two sides to it. I have friends who own dove gray smg cars with paddle extensions and ebay headers. Stage 3 burble tune and all. They have tons of fun and good reliability so far. I think it's dumb.

They think I'm dumb with $3000 airboxes and SS headers. "Dude you gotta get a burble tune it's so sick I shoot flames!!!!"
Haha this is my life right now. Surrounded by minimum wage ricers with beat up cars. I’m not even talking shit, being back in college I’m surrounded by it (mixed with kids with nice cars from rich families).

They think wrapping a roof in carbon fiber vinyl was the same as my full carbon fiber roof replacement. Or they’ll make fun of my brembo gt kit saying they’re useless in street.
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Old Wed, Dec-18-2019, 03:30:26 AM   #48
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Default Re: Burbles/Flames- harmful to motor?

They're good guys we just have different opinions on M3 mods lol
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Old Wed, Dec-18-2019, 05:04:06 AM   #49
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Default Re: Burbles/Flames- harmful to motor?

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Or they’ll make fun of my brembo gt kit saying they’re useless in street.
Are they wrong?

Sent from my SM-G950U using Tapatalk
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'05 M3 6MT coupe
'04 S2000

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, resonated S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Wed, Dec-18-2019, 05:08:24 AM   #50
terraphantm
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Default Re: Burbles/Flames- harmful to motor?

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Are they wrong?

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Even on the street you can appreciate better pedal modulation and such. One can also rightly argue that you can get the same benefit from one of the DIY BBKs using porsche calipers or whatever for a fraction of the cost. But if you want something that's plug and play, it's hard to beat a bespoke BBK if you can justify 5 large on brakes.
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Discussing Burbles/Flames- harmful to motor? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)