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Discussion Starter · #1 · (Edited)
Hey everyone,
After a short testing phase it is finally time to release my spark cut patch to the public, just in time for the DSM Shootout!
Warning! Repeated launches in quick succession will harm your clutches and/or your transmission. Staying on the rev limiter for an extended amount of time will cause component fatigue and failure.
USE AT YOUR OWN RISK, I hold no accountability for damages
What this patch does:
  • Uses the current fuel cut rpm to enact an addition spark cut rev limiter as either a primary or secondary rev limiter for the car.
  • The main spark cut rev limiter is variable for cars running Tephramod V2 or V3, using the current rev limiter for the map slot as the basis for the rev limiter.
  • Also adds the ability to use a spark cut rev limiter as the main stationary rev limiter, instead of the factory fuel cut for 5mt cars.
  • Allows SST cars to build boost off the line, allowing them to launch harder with the turbo already spooling instead of waiting for it to spool after launching.
Theory behind the patch:
  • The stationary rev limiter of this patch is very similar to the stationary rev limiter on the GSR's except it doesn't look for the clutch switch. Once it reaches the preset rpm it tells the coils to not charge, thus they can't spark until after the rpm drops below the threshold and then it repeats, very quickly building boost. In the case of the SST cars with launch control, it keeps the RPM just shy of the throttle closure rpm, building boost and still letting it launch.
  • For the main rev limiter, it uses the current fuel cut rev limiter RPM as the basis of its calculations. Due to the nature of how the ECU does math and rounding it is not a straightforward calculation. I have attached a program that will calculate the spark cut RPM given a fuel cut RPM and the entered multiplier.
  • The rev limiter was done in this manor so that if desired, then you could have a map using Tephramod V2/3 with a lower RPM than the main map, and still use the spark cut rev limiter. IE a valet mode.
Instillation:
  • Download the .txt file that is associated with you ROM, Read the instructions and warning at the top of the file, copy the XML data into the XML for your rom, save and enable using the [ ] keys.
  • When enabling the subroutine, Tephramod V2/3 users can use either the Tephra Rev Limiter setting or the Factory Setting. V1 and stock rom users use the Factory setting.
  • The call to sub is the master on/off for the patch. However if the subroutine is left stock you will brick your ECU.
  • After either the Divider or stationary rev limiter has been changed the subroutine will show “(no match)” That is normal.
Default settings:
  • Do not change any of these settings until after the subroutine is set.
  • By default the stationary rpm is set to 3000 RPM so that it can be safely tested without building much if any boost.
  • The Divider is set to 1.05, this effectively disables the spark cut rev limiter, setting to as a failsafe for the fuel cut rev limiter.
“Recommended” settings:
  • With the Fuel cut rev limiter set to the default 7599 and the Divider set to 1.11 the rev limiter will be just more than 7500
  • On a 5MT car the stationary can be set to the default of 5500, however the stationary rev limiter under limits will need to be raised.
  • On a SST car it needs to be set below the throttle closure RPM for the launch control, in testing we found 4500-4600 to be the most effective setting. On a stock 2.0 with a 5858 we built 3-5 psi depending on outside temperature, with no additional tuning.
Compatibility:
  • This patch has been fully tested with Rax V2/3 with no issues.
  • Tephramod V1/2/3 all work as expected.
Current data:
  • Stock turbo GSR with V2/3 Launch maps built 16psi of boost in .5s
  • 2.0L Stock Block MR with a ETS 5858 built 3-5PSI without launch maps or other tuning. Picking up .3 on his 60’
  • •2.0L Stock Block MR with a ETS 5858 built 15 PSI using Spark Cut and V3 launch maps
Current Roms:
59580004 2013-2015 GSR and Final edition
52690021 2008 MR
55580005/55580006 2010 MR
56900010 2011 MR
52680022 2008 USDM GSR
55570006 2010 USDM GSR
58010005 2012 USDM GSR
53050009 2008 EDM SST
53050012 2009 EDM SST
56920008 2011 EDM SST
53600010 2009 Ralliart
55590007 2010 Ralliart
59570004- 2013 USDM Ralliart
53610012 53610013 - 2010 EDM Ralliart
52360018 2008 JDM GSR
52680002 USDM GSR Final Edition

Current updated list

52370024
52680002
52680022
52690019
53040010
53050009
53050012
53600010
53610012 53610013
55570006
55580005 and 55580006
55590007
56890013
56900010
56910007
56910009
56920008
56950008
58010005
58020005
58030005
59570004
59580004
59590005


Missing your rom and want to be a test car? PM me and I’ll get you set up with a patch

Cost:
  • This patch is released free of charge. However if you would like to donate for my time and effort my paypal is my [email protected] All donations are very appreciated.
  • If you are a pro tuner and charge for the patch, please make a donation. I made this as easy to install as possible and would appreciate a cut for you making extra money for the extra effort I put in!
Videos/Media:
In this one he's using the launch maps from Tephramod V3, building 10psi
Here's him launching his car on 15 PSI
Here's some tests on my personal car
Here's a log of my stock turbo car testing it

https://www.facebook.com/pandamotorworks/videos/1025413707489410

Thanks:
  • Chet Rickman- Finding the Dwell logging information, which without this patch wouldn’t have happened.
  • Nathan G – Being the first to test on a SST showing proof of concept
  • Robert B- Being the first to launch with boost and testing V3 launch maps with the patch.

Issues:
  • Only currently known issue is if the Chassis year and Ecu/Rom year are not the same, this causes an issue with the stationary rev limiter not disengaging. Currently testing on a fix, if you have this issue, PM me and I’ll create a custom patch for you.
 

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Discussion Starter · #3 ·

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Discussion Starter · #5 ·
QUESTION!!!

So, this patch uses spark cut. I thought this type of cut was lesser preferred to fuel cut?

Wont this increases EGT's significantly? along with putting a lot more heat/stress on the turbo? since it will be moving combustion out of the cylinder, into the manifold?

Sounds and looks awesome fun though!
If you sat on it for an extended period of time it might start hurting the turbo/manifold, but as long as it's used responsibly I would not expect any issues, hell it hasn't cracked my stock manifold yet and I've had it on my car for over a year now and a decent amount of 2 steps and shenanigans.

Like everything with this platform, it's going to be a use at your own risk type of thing.

Also we have tephras blessing if that says anything about it
 

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Discussion Starter · #7 ·
Spark cut was used because that's what my friends with built drag cars use, and if they use it on their 4.2x 1/8 mile cars and their street cars, why not use it on my car
 

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Discussion Starter · #11 ·
finally, theres hope. I cant wait to boost launch. that was beautiful sir! which kozmic clutch pack is in that MR?
I talked to the owner and he said it's their package that uses OEM frictions and steels
 

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Discussion Starter · #14 ·
I'm still doing test, however if either of you have something different than a 08 MR, 09 Ralliart or a 13-15 GSR/ Final edition PM me and we can go from there!
 

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Discussion Starter · #16 ·
If you want to be the test car for that rom PM me ;) still have lots of Roms to patch and gotta start somewhere. Also I'd prefer if you have the ability to benchflash just incase, but no requirement to
 

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Discussion Starter · #18 ·

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Discussion Starter · #20 ·
dammit i dont have bookface! post that shit up!

Sent from my SM-G900T using Tapatalk
Not my video unfortunately, hopefully kozmic will post one on YouTube soon
 

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Discussion Starter · #21 ·

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Discussion Starter · #25 ·
Forgot about this thread. But the patch is available on the other forums. Most of the reception for this patch has been bad on this forum so i decided to release it elsewhere
 

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Discussion Starter · #27 ·
Decided I might as well, first post has been updated, Enjoy!
 

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Discussion Starter · #28 ·
If anyone on here uses it, i'd love to see some videos!
 

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Discussion Starter · #33 ·
gonna try it. Any reason i shouldnt use it for my normal rev limiter? (read, not my stationary)?
It's personal preference on that. I used it as my main, since in m option spark cut is a much safer limiter, but other share different views
 

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Discussion Starter · #34 ·
Big update, about 10 new patches all in the first post
 

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Discussion Starter · #35 ·

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Discussion Starter · #37 ·
Had some loose rocks and gravel so I spun a bit. Not really too many places around me to test this. Anyway 0 to 60 seems on point. Ill be heading to Englishtown on the 24th to post some times hopefully.



Awesome to see, thanks for posting!
 

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Discussion Starter · #45 ·
Can someone explain what does OP means by "5MT car the stationary can be set to the default of 5500, however the stationary rev limiter under limits will need to be raised"?

does stationary refers to the "Stationary Rev Limiter" or "Stationary Spark Cut Rev RPM" table?

And what is Stationary rev limiter under limits?
The original rev limiter for the 2 step needs to be raised so it does not interfere with the one for the patch. That is the one under limits
 

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Discussion Starter · #47 ·
Ok looking at pictures of my settings here, is that correct?

Top is the Patch settings, bottom is the factory revlimiter and limits.

Thanks for the response OP!
Yes that looks right if you want the stationary to be set to 5000
 

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Discussion Starter · #61 ·
Did anyone help him???
His issue is he's setting the limiter in the wrong place. The divider only affects the primary rev limiter, the stationary is what he would need to set. And to get backfires timing has to be drastically retarded. But as stated in the original post, it's hard on parts doing that and can damage parts
 
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