Hey all,
Jared here at UpRev. I just started hearing about this from Sharif early this morning and I also got a call from caneman88 today.
The hesitation is a really strange problem and we have not come across anything like it before. You'll have to excuse us for not finding this during development. It's pretty rare that we're working on a cold car. They are usually running on the dyno for hours and hours while we test.
The big delay on getting this resolved is going to be us getting access to a car so we can duplicate it an trouble shoot the issue. caneman88 said that he can bring his Z back up here for us to work on if for a day and I feel that there is a very good chance we'll be able to get it figured out in a day and get it resolved (as long as we're not having to let it cool down for 5+ hours between tests), but that's going to be 1-2 weeks from now depending on his schedule. If there is anyone in the Austin area who is willing to come in and let us test on their Z for 24 hours this week I will offer a free reflash license to them for the use of their Z. I would have to be a 370Z with one of the EAxxx ROMs since that seems to be the family of ROMs that is having this problem and they will need to be able to leave it here overnight so it can cool off enough to duplicate the problem.
There was mention of a user who is too far away from their tuner to get the car all the way back for the fix once we have this figured out... if you're willing to make a $200 "deposit" on a Cipher cable we can ship you an Osiris standard system with the fixed ROM and your tune loaded into it so that you can update your ECU and ship the cable back to us to get your $200 deposit back.
In the mean time, if there is anyone out there having this issue that has access to Cipher for data logging that could data log the ECU parameters when this is happening that could help us get off to an early start. It would be great to know if it's the throttle plate not opening right away, the VVEL not increasing the lift, or the fuel/ignition that is causing the hesitation. I will offer the same deal as above if someone wants to put down a deposit on a Cipher cable to get these logs for us.
About dumping the ROMs off of a 370Z... yes, it does take an hour to do any unsupported ECU. If it's already supported then it is possible to do the fast 2-5 minute dump, but if it's already supported, then we already have a copy of the ROM on file so there is little need to dump. You can't flash one of our dumped ROMs anyway. It has to be sent back to us so that it can be properly formatted to work with Osiris. There is a "back to stock" feature for the older style ECUs, but our developers are still working on support for the Gen4 ECUs found in the 370Z. They should have that feature wrapped up within a couple of weeks, but we felt that it was important to get the tuning capability out to our tuners even without the back to stock feature.
Please let me know if anyone has any further input or questions on the subject.
Jared@UpRev.com