Ign cut rev limiter applied to any VC, VD or VV ROM USD$2000

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

Edit: I'm not sure how to delete the thread but I think I have this under control now.

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

I'm making a little progress with this myself so the full bounty is on hold but please do reach out if you are capable or know someone who is and we can work something out.

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

I'm glad I kept going with this one myself. Worked exactly as intended.

https://drive.google.com/file/d/1ingQwh ... fcZ1g/view

Alex-Angarsk · **Joined:** Sat Mar 30, 2019 3:04 am **Posts:** 362

bradsm87 wrote:

I'm glad I kept going with this one myself. Worked exactly as intended.

https://drive.google.com/file/d/1ingQwh ... fcZ1g/view

Beautiful. How will this affect engine power?

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

Alex-Angarsk wrote:

bradsm87 wrote:

I'm glad I kept going with this one myself. Worked exactly as intended.

https://drive.google.com/file/d/1ingQwh ... fcZ1g/view

Beautiful. How will this affect engine power?

It's just the rev limiter but having said that, the timing trim map Y (RPM) axis uses 50rpm minimum increments so under heavy load, you feel the power loss with the ignition retard just before the limiter. I'm thinking about changing timing trim maps to use the 25rpm or 12.5rpm increments so I can have full timing all the way until immediately before the limiter then a sudden retard just in time for the cut.

n00bz · **Joined:** Wed Feb 08, 2017 8:10 pm **Posts:** 60

bradsm87 wrote:

Alex-Angarsk wrote:

bradsm87 wrote:

I'm glad I kept going with this one myself. Worked exactly as intended.

https://drive.google.com/file/d/1ingQwh ... fcZ1g/view

Beautiful. How will this affect engine power?

It's just the rev limiter but having said that, the timing trim map Y (RPM) axis uses 50rpm minimum increments so under heavy load, you feel the power loss with the ignition retard just before the limiter. I'm thinking about changing timing trim maps to use the 25rpm or 12.5rpm increments so I can have full timing all the way until immediately before the limiter then a sudden retard just in time for the cut.

Are you wanting this just for neutral?

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

n00bz wrote:

Are you wanting this just for neutral?

On the move as well. The ignition cut works perfectly. The one compromise is ignition timing. Noticable power loss just before the limiter with all the ignition retard to allow flames applied. I don't want to mess with ignition timing caclulation code though so I've minimised the compromise by working with the fact that BFS reduces once on limiter so it's not too bad now.

n00bz · **Joined:** Wed Feb 08, 2017 8:10 pm **Posts:** 60

bradsm87 wrote:

n00bz wrote:

Are you wanting this just for neutral?

On the move as well. The ignition cut works perfectly. The one compromise is ignition timing. Noticable power loss just before the limiter with all the ignition retard to allow flames applied. I don't want to mess with ignition timing caclulation code though so I've minimised the compromise by working with the fact that BFS reduces once on limiter so it's not too bad now.

I cant remember if yours is auto or manual

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

n00bz wrote:

bradsm87 wrote:

n00bz wrote:

Are you wanting this just for neutral?

On the move as well. The ignition cut works perfectly. The one compromise is ignition timing. Noticable power loss just before the limiter with all the ignition retard to allow flames applied. I don't want to mess with ignition timing caclulation code though so I've minimised the compromise by working with the fact that BFS reduces once on limiter so it's not too bad now.

I cant remember if yours is auto or manual

I offer this patch to both auto and manual customers. I used to own a manual model. Now have an auto one. The ignition retard does not start until after the normal full throttle shift point so it's only when you rev past that that the brief power loss happens before the limiter hits.

n00bz · **Joined:** Wed Feb 08, 2017 8:10 pm **Posts:** 60

bradsm87 wrote:

On the move as well. The ignition cut works perfectly. The one compromise is ignition timing. Noticable power loss just before the limiter with all the ignition retard to allow flames applied. I don't want to mess with ignition timing caclulation code though so I've minimised the compromise by working with the fact that BFS reduces once on limiter so it's not too bad now.

I cant remember if yours is auto or manual[/quote]

Did you throw a higher stall In yours? Trying to remember if that was you.

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

n00bz wrote:

Did you throw a higher stall In yours? Trying to remember if that was you.

Nah not me. I only bought this auto one 6 weeks ago to try and develop some of this stuff for then will sell it.

VinceZ33 · **Posted:** Wed Feb 26, 2025 9:29 pm

This is awesome man! $200 to modify a ROM for this?

bradsm87 · **Joined:** Thu Apr 14, 2011 8:16 am **Posts:** 425

VinceZ33 wrote:

This is awesome man! $200 to modify a ROM for this?

Can't do sorry. It ended up costing around $8k to develop and it'd only take one leak to mess it all up. I'll have a think about it though.

VinceZ33 · **Posted:** Thu Mar 13, 2025 8:52 am

Gotcha, understandable I misunderstood the thread lol I thought you were requesting this could be done for $200. Good on you figuring this out!

bradsm87 wrote:

VinceZ33 wrote:

This is awesome man! $200 to modify a ROM for this?

Can't do sorry. It ended up costing around $8k to develop and it'd only take one leak to mess it all up. I'll have a think about it though.

JandJSpeedShop · **Joined:** Wed Jun 01, 2022 9:57 am **Posts:** 6

bradsm87 wrote:

VinceZ33 wrote:

This is awesome man! $200 to modify a ROM for this?

Can't do sorry. It ended up costing around $8k to develop and it'd only take one leak to mess it all up. I'll have a think about it though.

$8k what? Hopefully you aren't talking about US Dollars

RomRaider

Forum rules

Ign cut rev limiter applied to any VC, VD or VV ROM USD$2000

Who is online