Backfiring tune for a daily driver - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BuBlake · 12-06-2014, 07:40 PM

What I want to accomplish is a backfiring tune that does not rely on POL fueling or the ignition advance maps to backfire. We have all probably seen the other thread where a guy figured out that he could retard timing at low loads on the ignition advance table and run a rich afr at low loads using the primary open loop fueling table.

This results in a nice backfiring effect when the revs are dropping and you simply put the weight of your foot on the pedal. I assume that is because the throttle must be pressed at least to >0% to get the plugs sparking again. Or is it just that the fuel is completely cut when the revs are dropping? Any help or insight is appreciated. I know this is all just an effort to look cooler. lol

A side effect of the tune is that when just cruising, the load drops to .15-.2 sometimes and causes jerkiness when the load comes back up. This is the primary reason I want to avoid using the above method to get the desired pops and burbles.

Also should I worry about fouling my plugs running a temporarily extremely rich afr and retarded timing?

raven1231 · 12-06-2014, 07:42 PM

Why? I don't understand the fascination. Mine does it and I find it embarassing

Sportsguy83 · 12-06-2014, 07:48 PM

Quote:

Originally Posted by raven1231

Why? I don't understand the fascination. Mine does it and I find it embarassing

Diff strokes for diff folks

BuBlake · 12-06-2014, 07:53 PM

Quote:

Originally Posted by raven1231

Why? I don't understand the fascination. Mine does it and I find it embarassing

Because... and I know this is going to sound cliche... RACECAR! ha ha

bee_are_zee · 12-06-2014, 08:57 PM

Don't apply it over the entire rev range. When I was messing around with it I would only run from redline down to about 3500.

BuBlake · 12-06-2014, 09:05 PM

Quote:

Originally Posted by bee_are_zee

Don't apply it over the entire rev range. When I was messing around with it I would only run from redline down to about 3500.

That's a good way to work around, as most cruising is below 3.5k. However, I want my backfires below 3.5k! Try harder!

bee_are_zee · 12-06-2014, 09:19 PM

I am definitely open to hear any other way to do this. My only previous idea would be to rescale the lower portion of the table to create a very small engine load range that would create the rich environment. That or determine why the table requires some kind of pedal input.

andrew5826 · 12-07-2014, 04:09 AM

you have to learn to drive around that load range to avoid the jerking but it takes practice and yes it can be annoying. easiest solution is to go ecutek and use the rom switching feature with the cruise control to run different maps

Fastbrew · 12-07-2014, 04:22 AM

Mine does it. It also shoots flames that are visible at night. It's not all the time. It will do it when the engine is cold and I step on it a little too hard before it is all the way warmed up. Occasionally when I let off the gas at high speed.

KoolBRZ · 12-07-2014, 08:23 PM

Quote:

Originally Posted by BuBlake

What I want to accomplish is a backfiring tune that does not rely on POL fueling or the ignition advance maps to backfire. We have all probably seen the other thread where a guy figured out that he could retard timing at low loads on the ignition advance table and run a rich afr at low loads using the primary open loop fueling table.

This results in a nice backfiring effect when the revs are dropping and you simply put the weight of your foot on the pedal. I assume that is because the throttle must be pressed at least to >0% to get the plugs sparking again. Or is it just that the fuel is completely cut when the revs are dropping? Any help or insight is appreciated. I know this is all just an effort to look cooler. lol

A side effect of the tune is that when just cruising, the load drops to .15-.2 sometimes and causes jerkiness when the load comes back up. This is the primary reason I want to avoid using the above method to get the desired pops and burbles.

Also should I worry about fouling my plugs running a temporarily extremely rich afr and retarded timing?

How about just changing the table used for the "sport" button? Then it only shoots flames when you want it to, and automatically resets every time you shut the car off, so the wife doesn't accidentally drive off and get arrested for shooting flames in the mall parking lot.

904FRSlow · 12-07-2014, 09:46 PM

Anyway to do this with OFT?

Teseo · 12-07-2014, 10:10 PM

If you are on budget, go with ALS (Anti-Lag-System).
The backfire come with nice bang-bang

bee_are_zee · 12-07-2014, 10:21 PM

Quote:

Originally Posted by 904FRSlow

Anyway to do this with OFT?

Short answer yes, there is an entire thread about it. I have no idea how to link threads on mobile, search backfire in the tuning section

Tenchi · 12-08-2014, 07:59 PM

I ran a map on my OFT for backfires and it ruined my exhaust. I suggest that you pass on this one. Just my .02

12-06-2014, 07:42 PM	#2
raven1231 Senior Member Join Date: Aug 2013 Drives: 2013 Firestorm FR-S, 2016 DGM WRX Location: Cincinnati, Ohio Posts: 4,580 Thanks: 8,264 Thanked 3,118 Times in 1,667 Posts Mentioned: 24 Post(s) Tagged: 1 Thread(s)	Why? I don't understand the fascination. Mine does it and I find it embarassing __________________ http://www.ft86club.com/forums/showthread.php?t=59870

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12-06-2014, 08:57 PM	#5
bee_are_zee Senior Member Join Date: Nov 2013 Drives: GBS BRZ Location: Kentucky Posts: 256 Thanks: 42 Thanked 98 Times in 60 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Don't apply it over the entire rev range. When I was messing around with it I would only run from redline down to about 3500.

12-06-2014, 09:19 PM	#7
bee_are_zee Senior Member Join Date: Nov 2013 Drives: GBS BRZ Location: Kentucky Posts: 256 Thanks: 42 Thanked 98 Times in 60 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I am definitely open to hear any other way to do this. My only previous idea would be to rescale the lower portion of the table to create a very small engine load range that would create the rich environment. That or determine why the table requires some kind of pedal input.

12-07-2014, 04:09 AM	#8
andrew5826 Señor Member Join Date: Jun 2013 Drives: BRZ SWP Location: BC Canada Posts: 192 Thanks: 22 Thanked 109 Times in 54 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	you have to learn to drive around that load range to avoid the jerking but it takes practice and yes it can be annoying. easiest solution is to go ecutek and use the rom switching feature with the cruise control to run different maps

12-07-2014, 04:22 AM	#9
Fastbrew Senior Member Join Date: Apr 2014 Drives: 2014 Pearl White BRZ Location: USA Posts: 764 Thanks: 123 Thanked 461 Times in 233 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Mine does it. It also shoots flames that are visible at night. It's not all the time. It will do it when the engine is cold and I step on it a little too hard before it is all the way warmed up. Occasionally when I let off the gas at high speed.

12-07-2014, 09:46 PM	#11
904FRSlow Senior Member Join Date: May 2014 Drives: '13 FR-S Whiteout Location: Saint Augustine Posts: 304 Thanks: 39 Thanked 88 Times in 59 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	Anyway to do this with OFT?

12-07-2014, 10:10 PM	#12
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,878 Thanks: 7,163 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	If you are on budget, go with ALS (Anti-Lag-System). The backfire come with nice bang-bang

12-08-2014, 07:59 PM	#14
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I ran a map on my OFT for backfires and it ruined my exhaust. I suggest that you pass on this one. Just my .02

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