Vg30e Launch Control

[tht_z31]

What’s up everyone, I’ve been playing around with the launch control and got a couple question to get some more boost. I had limit at 3500, retard at 3300, and retard at 0, this got me 1psi.The cycle on the limiter is very slow, about a 1000rpm drop between each cycle. I raised the limit to 4000 and retard to 3800 and still super slow. Kinda sounds like fuel cut with no ignition retard, are the vg30e ecu capable of ignition retard for launch control? Is there any way to speed up the limiter?
Thank you in advance

[Matt]

You can try adjusting the rev limit count. What the LC does is effectively temporarily set the soft limiter to this RPM when it is 'engaged' and same with the ignition timing

When testing on my cars, I think I had it lower, to try and get the PSI up faster

[tht_z31]

You’re the man Matt, appreciate it
I can’t seem to find the rev limit count.

[Matt]

Unfortunately there is a reason for that. In the RB30 which is very similar, it is adjustable. However Nissan hard coded it to 200 for Z31 as you can see. So we can't adjust it

[tht_z31]

ok, thank you

[Timbo_021]

Hi Matt,
I have just come across this same thing, my Z31 ECU is probably the latest one you have modified for the feature pack. The launch control is very un-exciting for the Z31.. I have access to UV light chip coding. Does that help to program hard coded things? Can we do anything to make it more like it should be?

[Matt]

We can update the ENT file and 'hard patch' the ECU code changing addresses:

Hex: 0200 value:

Code: Select all

A9CF: 02
A9D0: 00

Lowering this say by half (0100) will result in shorter cuts. FYI Trying to patch the code otherwise would be a bit complicated.

You could try the hex editor built in Display > Hex Editor and then find row A9C0 , and last value 02, change to 01.

However usually we 'protect' the ECU code and avoid writes (inside the firmware) so this might not work.

Other option is get the board reflashed with an ENT file modified to have this lower value. I can also do this.

[Timbo_021]

No problem, ill let you know how I go
Cheers Matt!

[Timbo_021]

Hey Matt,
Just having a look at the hex editor now, all the address lines in my ECU have numbers infront of them, not letters. I'm guessing it's not adjustable in here then?

[Matt]

Might need to check your ECU part number

Z31 26Pxx model has the following code lines instead. See attachments

2F37/2F38 is what we need to adjust (there is a 0x8000 offset from AF37/AF38)