GL1 cable data does not want to overlay.

[Harry]

In case it is jumpy, that's a signal there is still an issue. You may send another log (after having 0720 disabled) so I can check. RPM delays are the first thing humans can detect (audio / rpm relation), so sometimes it needs to be adjusted. Please search for "sensor delay" here on the forum. The setting you need to change is "Video Synchronization", not one of the OBD / GPS etc delays. Once you have increases / decreased the value, overlay again. LapTimer's overlay screen has an option to use GPS instead of OBD - check the second page in Overlay Configuration. As another option, you can calibrate OBD speed using the speed multiplier in LapTimer's Expert Settings. Enter 1.07 (instead 1.0) to get 7% more. Coolant is displayed in the extended OBD gadget (Grand Prix). It is requested at a much lower rate than RPM already. Finally, you can add more PIDs by concatenating the exclusions (4 digits each, no separator). My recommendation is to not remove other PIDs. LapTimer is optimized to request PIDs at different speeds, so you will hardly ever generate an improvement. Instead, chances are good the analytics part will run into problems if e.g. speed is missing.

- Harry

[alollini]

yes, i will soon send you a trace log using GPS buddy

[alollini]

I have sent a log this morning august 6 about 9:11 AM
I hope it is readable.
I used only the odb and not the vbox sport.
the 0720 was disabled.
on the gps view i could see a refresh rate of 3 hz.

[Harry]

The dialog seen in the log is o.k. The special think about your car is there seem to be three ECUs responding to most requests (which is unusual). Sometimes the ECUs answer with different results (e.g. asking for speed generates 3 replies with 2 different values), which generates small jumps depending on the reply timing. That is nothing that can be improved with the current version but I will add an OBD Tweak to an upcoming version that allows filtering replies to one ECU only.

- Harry

[alollini]

Yes on this car we have one problem: I changed the gear so it's calculation is now off and the consequence is it stops regenerative braking of the hybrid part. If we manage to explain the ecu the right gears we may get back the regenerative braking all together.

[alollini]

modified Honda CR-Z

ok, I have now a brand new BT1A was the only simple fix to my GL1 cable that does not want to update its firmware.
the BT1A has the latest firmware.

I have sent you a new datalog with GPS Buddy.

as I mention in the email, this car has several CAN bus modules that should work together okay.

I changed the final gear and as mechanically it works perfectly fine, this modification upsets some data in the electronics, leading to gear not reporting correctly and ultimate results maybe :
- inconsistencies in Lap Timer (rpm jumpy - poor frame rate in odb info)
- hybrid system of the car does not want to do the regenerative braking part.


when the BT1A queries the car, it gets 3 modules answers ?

- one should be the PGMFI i can reprogram with my Hondata Flashpro (there is a speed "VSS" correction here i can edit)

- a second one should be IPU (intelligent power unit = linked to the hybrid IMA battery pack) maybe i can watch its behavior with my HDS : the equippment of Honda dealership i have. (witch i don't know how to use)

- the third i have no idea ? maybe ABS / VSA wich is a sort of anti-understeer.

that would be great if we could make progress on this as there is one cause, several consequences, and mutual interests in those issues.

any more information would be greatly appreciated.

[Harry]

Hi,

The VSS request is answered with

00 03 03 41 0D 11
00 04 03 41 0D 11
00 10 03 41 0D 11

0x03 / 0x04 / 0x10 are the ECUs answering and they look pretty custom. I know there is a mode 0x09 pid 0x0a which returns a 20 byte ECU name but I do not know if your car / ECUs support this PID. Furthermore, LapTimer does not query this PID, so is of little help here. You may try some OBD dedicated software to check that. As the GoPoint OBDs use a binary protocol, a terminal window I would use for ELM327 dongles cannot be used.

The engine / main ECU will typically be 0xE8 with other "standard" ECUs some where above... The transmission ECU will typically use 0xE9.

- Harry

[alollini]

Thanks!

so you have a consistent rpm, but an inconsitent VSS ?

maybe the jumpy rpm problem can be solved by just listening one answer ?

anyway i have submitted some information to two different forums with people that may have better insight than me about this specific car.

[Harry]

No, sometimes they are consistent, sometimes not. Sample for RPM:

00 10 04 41 0C 1F 9C (2032 rpm)
00 03 04 41 0C 1F A0 (2024 rpm)
00 04 04 41 0C 1F C0 (2032.25 rpm)

This means the value is either sourced by different sensors, or represent different points in time... I'll send you the "readable" log by mail.

- Harry

[alollini]

ok here is my advance on this :

this car has a small problem, I changed gear ratios by changing final gear.

the car reports in what gear it is internally, by looking at a "gear lookup table" which is a table i don't know how to edit.

but i still think the 3 different ECU returning data is something normal on this car.

for LapTimer to work properly we should choose one value only and use always the same.

I have a trackday on october 10, and i would like to try something first in order to make good videos.

it is unlikely the rpm values represent different points in time.