I punched in some data and I wanted to see if I have done it correctly. I have a 2014 Cayman S (981 S). I think the gear ratios are here: https://rennlist.com/forums/987-981-for ... st10580765
I'm not sure why but my tachometer/hp are clearly not right in this video: https://www.youtube.com/watch?v=pJ63AjNx-QU
The shift flash seems to working - at 90% it was too aggressive and at 95% it feels pretty comfortable.
Here are the screenshots of my config (Vehicle 1 is my Cayman): https://imgur.com/a/E4TUfWf
EDIT: Forgot to specify I'm using the OBDLink LX BT https://www.amazon.com/dp/B00H9S71LW
OBD2 scanner set up
Re: OBD2 scanner set up
The rpm values for max torque and power look wrong. They will not be the same and a typical value for max torque and the Porsche engines are in the 4tsds.
For the gear, please check the drive ratio.
Harry
For the gear, please check the drive ratio.
Harry
Re: OBD2 scanner set up
What should the graph look like?
Which gear? The drive ratio seems to be 3.89 which is what I have plugged in. This page compliments the forum post, too: https://www.edmunds.com/porsche/cayman/ ... pecs1.html
Re: OBD2 scanner set up
Looking into the last sheet, the rpm max torque is achieved is at 4500, and max power at 7400.
On the gear calculation: in case all of wheel specs, drive axle, gear and drive ratios are fine, you should see realistic speeds in the rpm / speed diagram. Please verify this. In case this is correct, the only other source of wrong gear values are invalid wheel speed or rpm values delivered by the OBD adapter. Please check whether you get clean values here and you do not have disconnects in between.
Harry
On the gear calculation: in case all of wheel specs, drive axle, gear and drive ratios are fine, you should see realistic speeds in the rpm / speed diagram. Please verify this. In case this is correct, the only other source of wrong gear values are invalid wheel speed or rpm values delivered by the OBD adapter. Please check whether you get clean values here and you do not have disconnects in between.
Harry
Re: OBD2 scanner set up
The speed limits on LapTimer in each gear are off by a little bit, not all that much though. I'm not sure where to look for the mistake.
![Image](https://i.imgur.com/kVtoDEJ.png)
I do know there's an issue with gear 6/7 where the max rpm are 6850/4825 but I don't see a place to specify that.
![Image](https://i.imgur.com/kVtoDEJ.png)
I do know there's an issue with gear 6/7 where the max rpm are 6850/4825 but I don't see a place to specify that.
Re: OBD2 scanner set up
Max rpm is not relevant. What is relevant are gear and drive ratios, tire sizes, drive axle selection, OBD rpm and speeds.
Harry
Harry
Re: OBD2 scanner set up
It is not incorrect, you just can’t reach it on flat surface. Find a road steep enough and you can reach any speed.
The diagram is not made to understand top speed. In case you want to simulate this, please try Analysis / Drag Simulator. You can adjust the slope by using a drag feature. Make sure you specify all required vehicle data like Cd value or front surface.
Harry
![Smile :-)](./images/smilies/icon_e_smile.gif)
The diagram is not made to understand top speed. In case you want to simulate this, please try Analysis / Drag Simulator. You can adjust the slope by using a drag feature. Make sure you specify all required vehicle data like Cd value or front surface.
Harry
Re: OBD2 scanner set up
What I'm ultimately trying to figure out is why the throttle/braking graphs as well as the gear/rpm versus my drive line is so far off. It's clear from the G force I'm doing one thing but the tachometer is saying something different.