DIY Rom tuning for exhaust pops and backfires W/ romraider

[steve99]

Originally Posted by 6ixfrs

I tried, and i get the error ecu definitions not found.

You may need to edit the def as described in post

[Wil]

Hi,
Does this look right to you?
Should I modify Base Timing A as well?
For OFH header + muffler delete.

I'm looking for something very conservative. No POP and BANGS but rather a smooth burble.
Thank you.

[elBarto]

Originally Posted by Wil

Hi,
Does this look right to you?
Should I modify Base Timing A as well?
For OFH header + muffler delete.

I'm looking for something very conservative. No POP and BANGS but rather a smooth burble.
Thank you.

You don't have to modify the Base timing A, it's only being used when in Safe mode.
I find it better to use the overrun method. Better drive-ability and safer (I think).
I see you're from Belgium as well, don't know if your from the Flemisch or the French part of Belgium. I can help you in Dutch if you want, my French isn't the best.

[Wil]

Originally Posted by elBarto

You don't have to modify the Base timing A, it's only being used when in Safe mode.
I find it better to use the overrun method. Better drive-ability and safer (I think).
I see you're from Belgium as well, don't know if your from the Flemisch or the French part of Belgium. I can help you in Dutch if you want, my French isn't the best.

Thank you for your answer!
I'm from Liège. I just helped a friend buy his first GT in Maasmechelen last Sunday!

Can you give me a bit more details about the overrun method (in English, I guess ahah), please?

I'm only looking for burbles on decel between let's say 3600-5500 rpm.

[elBarto]

Originally Posted by Wil

Thank you for your answer!
I'm from Liège. I just helped a friend buy his first GT in Maasmechelen last Sunday!

Can you give me a bit more details about the overrun method (in English, I guess ahah), please?

I'm only looking for burbles on decel between let's say 3600-5500 rpm.

I'm just going to quote the original creator, he explained everything.
Pops are controlled with the accelerator, you can change the values (the -4.88) to anything you want. Going positive gives a softer result

Originally Posted by eddieflyinv

@504 @sqd @dhuang finally got around to this.
Just an example of my current settings for overrun, not too much has changed from my previous experiment, mind you im just starting playing with it again

First 3 tables are located in Fueling - Overrun Folder
- Overrun Initial Enrichment @ 1.2
- Fuel Cut Threshold @ 6000
- Overrun Enrichment Activation Delta @ -15
Last 2 Tables found in Ignition Timing - Advance Folder
- Rescaled the Base Timing Idle (In Gear Above Speed Threshold) table, like I mentioned before, my preference was for this to only start occurring when the engine was almost warmed up
- Raised the value in Base Timing Idle Vehicle Speed Threshold table, this helped quite a bit to avoid low speed jerkiness (10km/h because canada)

As mentioned before, may have to play with the amount of Overrun Enrichment and the values used to retard timing in the Base Timing Idle table, previous tunes were Stage 1 with Stock headers and catless overpipe, and with the stage 2 tune and no cats I have reduced Initial Enrichment from 2.8-1.8 to 1.2
Things acheived
- Lots of explosive crackles at high rpm lift,
- Crackles between shifts (with slight delay, seems to be more time related than rpm related, so OL/CL transition delay settings may potentially alter that)
- downshift bangs, lately they seem to be singular (only had this tune up again since last night) but theyre loud, though they are not rpm limited anymore, (never used to get them above 3krpm before)
- feathering popping/crackle, find that spot and it will pop endlessly, often on tip in there is a slight initial crackle, and if you have your cruise on going down hill your car will sound like automatic gunfire the whole way down 🙊 not sure if the tip in crackles can be gotten rid of, seems to be table switching delay so maybe messing with the OL/CL transition delays could reduce or eliminate that as well.

Example of some softer settings:

+10 @ 2500
+5 @ 3500
+2.5 @ 4500
0 @ 5500

[Wil]

Thanks!
But with that method, I'm going to have crackles all the time, right?
I like this idea of being able to control them with the throttle, actually...




emh... this doesn't look right, does it?

[elBarto]

Originally Posted by Wil

Thanks!
But with that method, I'm going to have crackles all the time, right?
I like this idea of being able to control them with the throttle, actually...




emh... this doesn't look right, does it?

No, you have old definitions.

Since you are using A00G (I have the same cal Id), I've linked updated definitions and a Stage2+ Popcorn tune. Adjust to your liking

A00G Def + Stage2+ Popcorn

[Wil]

Haven't used ROM Raider for a long time... Thanks for sharing

[Wil]

Originally Posted by elBarto

No, you have old definitions.

Since you are using A00G (I have the same cal Id), I've linked updated definitions and a Stage2+ Popcorn tune. Adjust to your liking

A00G Def + Stage2+ Popcorn

In your maps you only modify the base timing idle (in gear) table?
All else is identical to the OTS V4 stg2+ map?

[elBarto]

Originally Posted by Wil

In your maps you only modify the base timing idle (in gear) table?
All else is identical to the OTS V4 stg2+ map?

No, I've changed some other settings as well, LC is at 4000rpm, some old Wayno mods, DBW, idle rpm's.
Popcorn tune has the posted settings.
Use the supplied definition to open them.

[Wil]

Originally Posted by elBarto

No, I've changed some other settings as well, LC is at 4000rpm, some old Wayno mods, DBW, idle rpm's.
Popcorn tune has the posted settings.
Use the supplied definition to open them.

Thanks. Can you specify the mods and how they affect the car's behaviour in general? I kind of like the throttle as it is.
(Well, let's resume by PM so we don't pollute the thread too much, haha)

[JustunTime]

I followed the instructions to modify map B and set it at -8 and then -9 (using stage 2 plus AND stage to + E85) and neither give me any significant cracks or pops. Basically NONE. I might hear 2 or 3 low ones on a 20 minute drive. I have the Tomei UEL and nvidia catback... I do have a weaponX intake rather than stock airbox but I cant imagine that the issue...

What to I do?

Oh, I do have the O2 extension in the UEL still... Should I remove that?

[tomm.brz]

put negative timings untill 0.3 of engine load and you will have them

[JustunTime]

Originally Posted by tomm.brz

put negative timings untill 0.3 of engine load and you will have them

Still not getting much that I can hear....