rom tuning for pops and backfires - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

andrew5826 · 03-10-2014, 12:28 AM

I want my car to backfire and pop more. I'm on oft stg2 with Jdl uel and Tomei type 80. it occasionally pops when engine braking to a stop and blipping when putting in neutral, and also up shifting, but i want it to happen more often. what should I change in my rom to get this? from what I understand, pops are from extra fuel, oxygen in the exhaust, and retarded ignition, but how can I safely tune for it while keeping max power and efficiency? don't comment on this being ricerish or bad for the environment/neighborhood, it's ****ing awesome

Grip Ronin · 03-10-2014, 12:45 PM

ive been surfing the tablet and learning the tuning with it since the day it came out trying to do this. nobody will help us on any forum they jus ignore it..its closed loop area you can dump fuel but i havnt found how to control timing. it always goes to 32-34deg

Malt · 03-10-2014, 01:02 PM

Quote:

Originally Posted by andrew5826

I want my car to backfire and pop more. I'm on oft stg2 with Jdl uel and Tomei type 80. it occasionally pops when engine braking to a stop and blipping when putting in neutral, and also up shifting, but i want it to happen more often. what should I change in my rom to get this? from what I understand, pops are from extra fuel, oxygen in the exhaust, and retarded ignition, but how can I safely tune for it while keeping max power and efficiency? don't comment on this being ricerish or bad for the environment/neighborhood, it's ****ing awesome

Not sure if you are serious or not....

steve99 · 03-10-2014, 01:08 PM

Try the waranttee return bin at the dealer for some Direct Injectors with crook DI seals = pops

Remove port injectors , run a 1/8" drill bit through 'em should make it run rich = backfires

Malt · 03-10-2014, 01:14 PM

Quote:

Originally Posted by steve99

Try the waranttee return bin at the dealer for some Direct Injectors with crook DI seals = pops

Remove port injectors , run a 1/8" drill bit through 'em should make it run rich = backfires

Or you could remove the primary O2 sensor and pipe the fuel pump return line into that port.

andrew5826 · 03-10-2014, 01:26 PM

Quote:

Originally Posted by Grip Ronin

ive been surfing the tablet and learning the tuning with it since the day it came out trying to do this. nobody will help us on any forum they jus ignore it..its closed loop area you can dump fuel but i havnt found how to control timing. it always goes to 32-34deg

it's tough to find good help on this forum, everyone seems to think they're funny.. would changing the decel fueling be a step In the right direction?

Sent from my SGH-I337M using Tapatalk

DJCarbine · 03-10-2014, 01:27 PM

Perhaps retard the ignition in the decel columns?

What sort of injector overrun settings can you alter?

mad_sb · 03-10-2014, 01:33 PM

Quote:

Originally Posted by andrew5826

I want my car to backfire and pop more. I'm on oft stg2 with Jdl uel and Tomei type 80. it occasionally pops when engine braking to a stop and blipping when putting in neutral, and also up shifting, but i want it to happen more often. what should I change in my rom to get this? from what I understand, pops are from extra fuel, oxygen in the exhaust, and retarded ignition, but how can I safely tune for it while keeping max power and efficiency? don't comment on this being ricerish or bad for the environment/neighborhood, it's ****ing awesome

A front pipe with a highflow metal core cat will help. As for tuning, your wanting to add fuel in an area where the ecu has cut off the injectors (decel / lift throttle) so your going to have a hard time. You can target richer afr under load and mess around with the decel fueling tables a bit.

Your not going to find a lot of people that tune for this on purpose so the knowledge is probably just not there. But there is nothing stopping you from figuring it out.

Log, adjust, test, repeat

Grip Ronin · 03-10-2014, 02:15 PM

Quote:

Originally Posted by andrew5826

it's tough to find good help on this forum, everyone seems to think they're funny.. would changing the decel fueling be a step In the right direction?

Sent from my SGH-I337M using Tapatalk

you could but it wont give you the effect you want without pulling timing

Xero-Limit · 03-10-2014, 02:18 PM

We do this with EcuTek using custom maps.

[ame="http://www.youtube.com/watch?v=xFo9NOKmcrY"]BRZ Supercharged w/UEL Night Run - YouTube[/ame]

It can be done.

andrew5826 · 03-10-2014, 08:41 PM

Quote:

Originally Posted by moto-mike

We do this with EcuTek using custom maps.

It can be done.

reveal the secret!

Sent from my SGH-I337M using Tapatalk

Grip Ronin · 03-10-2014, 09:44 PM

Quote:

Originally Posted by moto-mike

We do this with EcuTek using custom maps.

It can be done.

it sounds good but can it be done without F.I? ive seen the turbo frs's do it

Xero-Limit · 03-10-2014, 09:52 PM

Quote:

Originally Posted by Grip Ronin

it sounds good but can it be done without F.I? ive seen the turbo frs's do it

Yup, no FI needed. Just RaceROM.

Shiv@Openflash · 03-10-2014, 10:08 PM

I'm quite sure it's possible to do by just remapping the active ignition table and by playing around with the duration for throttle enrichment.

03-10-2014, 12:28 AM	#1
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)	rom tuning for pops and backfires I want my car to backfire and pop more. I'm on oft stg2 with Jdl uel and Tomei type 80. it occasionally pops when engine braking to a stop and blipping when putting in neutral, and also up shifting, but i want it to happen more often. what should I change in my rom to get this? from what I understand, pops are from extra fuel, oxygen in the exhaust, and retarded ignition, but how can I safely tune for it while keeping max power and efficiency? don't comment on this being ricerish or bad for the environment/neighborhood, it's ****ing awesome

03-10-2014, 12:45 PM	#2
Grip Ronin The Mechanic Join Date: Mar 2012 Drives: Civic Turbo,FR-S Location: NJ Posts: 928 Thanks: 130 Thanked 171 Times in 119 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	ive been surfing the tablet and learning the tuning with it since the day it came out trying to do this. nobody will help us on any forum they jus ignore it..its closed loop area you can dump fuel but i havnt found how to control timing. it always goes to 32-34deg __________________ IG-Joey_Soul Progress Thread Ported billet 20G

03-10-2014, 01:27 PM	#7
DJCarbine Thupercharged Join Date: Mar 2013 Drives: 2013 FR-S Location: La Grange Park, IL. Posts: 1,501 Thanks: 116 Thanked 751 Times in 439 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	Perhaps retard the ignition in the decel columns? What sort of injector overrun settings can you alter? __________________ 2013 FRS Vortech V3 11psi Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300 2019 Series.Grey STI - Stage1+ SF

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03-10-2014, 01:08 PM	#4
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,993 Times in 2,983 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	Try the waranttee return bin at the dealer for some Direct Injectors with crook DI seals = pops Remove port injectors , run a 1/8" drill bit through 'em should make it run rich = backfires

03-10-2014, 02:18 PM	#10
Xero-Limit Join Date: Nov 2012 Drives: JDL Turbo FRS, 335SC BRZ (ret) Location: Lehigh Valley, PA Posts: 938 Thanks: 368 Thanked 1,550 Times in 527 Posts Mentioned: 380 Post(s) Tagged: 6 Thread(s)	We do this with EcuTek using custom maps. [ame="http://www.youtube.com/watch?v=xFo9NOKmcrY"]BRZ Supercharged w/UEL Night Run - YouTube[/ame] It can be done.

03-10-2014, 10:08 PM	#14
Shiv@Openflash Senior Member Join Date: Sep 2013 Drives: 2013 FRS Location: SF, CA Posts: 2,629 Thanks: 1,055 Thanked 5,470 Times in 1,494 Posts Mentioned: 605 Post(s) Tagged: 9 Thread(s)	I'm quite sure it's possible to do by just remapping the active ignition table and by playing around with the duration for throttle enrichment.

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