ZF 8 Speeds have been read for quite a while now and lots of tuning available for them. They are quite widespread on popular dodge vehicles. The only reasons its not working out of the box is because no one has ever tried with HP Tuners like I have. HP Tuners is very receptive to getting it to work so in time I have faith they will get the definition files updated so it can be read properly. No different than when in 2015+ all the Chrysler vehicles had locked PCMs and not you can unlock them and tune them. Time and patienceAs far as I know, the only way to read and write data to a ZF is one of these.
I'm curious, have you tried to get the tranny to go into 9th gear more consistently?Not much to update as HP Tuners is still working on support for the 9 Speed. I've been playing around with ERS and found (not surprisingly) its a very unreliable method to attempt to get the vehicle to shift at a higher rpm.
You can see there is almost a 2 step rev limiter with a "soft' limiter at 6500rpm and then fuel cutoff at 6800.
Being tuned I no longer have the 6500rpm soft limiter issue and I can go right to 7000rpm the problem is that it's very abrupt and sounds bad.
The issue is no matter what rpm I tell ERS to go to the next higher gear it still ends up hitting off the rev limiter as there is most likely a bit of a delay between when you tell the ERS to upshift and when it actually happens, under WOT milliseconds count and get it wrong and your smash off the limiter like a riced out honda.
Based on how I have everything set up, a 6800rpm shifting RPM would probably work best.
My thought was, via programming, you might be able to reduce the speed at which 9th becomes available. Oh well, no matter. Was just curious.It won't go into 9th gear any more than it would otherwise. Its simply based on a bunch of variable and 99% of the time the reason is that the vehicle is not going fast enough to go into 9th gear. In Canada there is no place I could legally drive to get into 9th gear on regular basis. Fuel economy doesn't suffer because we don't see 9th gear very often. If you lived where you could drive 100mph all the time you would see 9th gear.
Since there is something like 89 different shift patterns its not cut and dried thats for sureWow. I'd given up on the possibility of a smooth change from 2nd to 3rd or actually matching engine rpm to gearbox speed on downshifts (rather than the forward lurch).
Is it possible or will my hopes be dashed once more?
Crash486 - Jeep Cherokee Limited diesel
Since there is something like 89 different shift patterns its not cut and dried thats for sure
Maybe this is a value that needs to be changed for you
Also to note, i'm getting an error message reading my 2014 cherokee, it has a different operating system so hopefully HP Tuners can get that one working too so I can compare