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-   -   rom tuning for pops and backfires (https://www.ft86club.com/forums/showthread.php?t=60278)

andrew5826 03-10-2014 12:28 AM

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

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 (Post 1586556)
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

:laughabove: 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 :D

Malt 03-10-2014 01:14 PM

Quote:

Originally Posted by steve99 (Post 1587421)
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 :D

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 (Post 1587347)
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 (Post 1586556)
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 :burnrubber:

Grip Ronin 03-10-2014 02:15 PM

Quote:

Originally Posted by andrew5826 (Post 1587463)
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 (Post 1587611)
We do this with EcuTek using custom maps.

BRZ Supercharged w/UEL Night Run - YouTube

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 (Post 1587611)
We do this with EcuTek using custom maps.

BRZ Supercharged w/UEL Night Run - YouTube

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 (Post 1588974)
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.


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