Dyno tuning - locking transmission in gear

[immortality]

Hey Guys,

Last week while I was at the dyno the operator wanted to know if I could lock the transmission in 3rd gear (VT L67).

Now I think I did see a thread about doing this but I can't find it.

Any info would be greatly appreciated.

Thanks

[VX L67 Getrag]

Yeah there is a command you can send & need to make sure it has tcc unlocked in the command too, if no one else replies I will try & dig the command up but use at own risk (you also need to either stop connection or send another mode 4 command to unlock the gear/command too).

[VX L67 Getrag]

0xF5 0x57 0x04 0x81 0x00

That should be the command to send & have 2's compliment for checksum which should work it out to 2F

Then to clear all it should be

0xF5 0x57 0x04 0x00

with 2's compliment for checksum again & should be B0

Need to make sure it has at least 1 0x00 after the command for some reason otherwise sending commands don't work I believe (not sure why).

EDIT: use at own risk no guarantee & may cause damage

[immortality]

Cheers mate.

hopefully somebody else can confirm?

This would be easier than altering the shift tables so it just doesn't kick down a gear whilst it's on the dyno.

This is all new to me.

[VL400]

Can also generate your own mode 4 commands for various things using this spreadsheet and command files .. http://pcmhacking.net/forums/viewtopic. ... ock#p23951

[immortality]

Cheer mate,

Looks like I have some more learning to do

[Holden202T]

its a constant learning curve this EFI world of ours

[delcowizzid]

if youre allready in the bin tuning you could just set the upshift downshift speeds so it wont shift and set back where you want them when finished

[immortality]

We tried that on monday, changed all the downshift speeds to 15km/h but the car still kicked down on the dyno.

[VX L67 Getrag]

Yeah I had the same issue, that's why I just used the send command option!

EDIT: I'm pretty sure when I tried the bin mod from memory I maxed all the down speed so it wouldn't reach them, but also have to disable tcc! But for whatever reason it still downshifted!