[In Development] VT - VY Ecotec / L67 Spark Cut Rev Limiter

[JCSuperina]

Well if you ever want someone else to test it on their skid pit let me know happy to be a tester for ya

[Nick97]

If you set the limiter to 6375 on factory code it will skip the limiter all together, this is because the code checks if the rpm > what you set, and 6375 is 0xFF in the calibration so it's max and can't get any bigger, so if it's not above the limit it will skip the limiter, you can patch the ECU to read the RPM from a 16 bit address instead and read up to 8000+ RPM however at 6500+ RPM the spark control becomes less then average.

The way this works is factory code has RPM as an 8 bit value that uses 25 RPM per bit, so the max a 8 bit value can be is 255 which is 0xFF in hex and 255 x 25 = 6375.

So yes it can be done but in my opinion there's no point until you sort out the spark control issue, that and the ecu would require more patches to extend the tables to be able to "tune" at that RPM.

thats awesome work!!

i feel like i know you from GTA days but cant quite remember if it was ChromeXmods or something like that

Ahahaha yeah Chr0m3 x MoDz was me in the GTA days!

bro no way i didnt know you were aussie haha i miss the old gen days thats for sure and now ive moved over to doing cars and tuning like you have i guess thats crazy me and a few mates used to sell heaps of modded consoles back in the day used to make good cash off it

[Muncie]

Hows this trucking along?

[Nick97]

Highest I can get fuel cut is 6375rpm. So have you modified that to be able to be set higher?

If you set the limiter to 6375 on factory code it will skip the limiter all together, this is because the code checks if the rpm > what you set, and 6375 is 0xFF in the calibration so it's max and can't get any bigger, so if it's not above the limit it will skip the limiter, you can patch the ECU to read the RPM from a 16 bit address instead and read up to 8000+ RPM however at 6500+ RPM the spark control becomes less then average.

The way this works is factory code has RPM as an 8 bit value that uses 25 RPM per bit, so the max a 8 bit value can be is 255 which is 0xFF in hex and 255 x 25 = 6375.

So yes it can be done but in my opinion there's no point until you sort out the spark control issue, that and the ecu would require more patches to extend the tables to be able to "tune" at that RPM.

Hey man any updates on this yet?

[Chr0m3]

Haven't worked on this in a while, I've started doing some research with the1 as well on this, I've had some personal circumstances change and I won't be looking at this for a bit at this current time.

[The1]

Ive pretty much come to end of the road after quite a few hours of digging and testing, there's a few other things left to try that might still work, in the next week or so i should get time to test.

[Chr0m3]

Ive pretty much come to end of the road after quite a few hours of digging and testing, there's a few other things left to try that might still work, in the next week or so i should get time to test.

Did you get a chance to try what I sent in PM?

[The1]

not yet

[Chr0m3]

not yet

Probably not a high priority given the weather situation for us both at the moment..

[Muncie]

If you need a turbo vy to try out with flash pcm pm me. The whole car is an experiment at moment seems to take abuse well.