There are many different ways to go about this but very few have a good grasp so here is how I do it.
Example car:
02 LS1 Camaro A4 Stock 3.23 Gears
Steps:
More art then science:
- Log at least 2 wot runs from a stop going through the 1-2 & 2-3 shifts
- Log at least 2 wot runs from a roll going through at minimum your 2-3 shift
- Review your Logs & note Both RPM & MPH at each shift
- Review your HPT/Bin file's current shift point RPM & MPH points
- Remember that there are two flags for the A4(MPH & RPM) both must be met to achieve the shift command. Also keep in mind things like desired shift times, shift pressures, TM all play a hand in how long it will take to shift.
Now here is where it may get a bit tricky for some as transmissions arent always the most consistant piece and when they heat up they tend to slip a little more & a little more so these are just general guidlines.
Just remember this is only a guide and this is how I do it...there are many people/vehicles that sometimes don't cooperate and I've heard of people setting the RPM markers to 0 or the MPH markers to 0 to get the vehicle to shift properly.
- your MPH & RPM #'s in your HPT/Bin files should be lower then your logged #'s because of both markers being needed for a shift to occur
- There will usually be one with a bigger difference then the other ie mph marker might be 76mph but the vehicle doesnt shift until 85mph.
- If #2 occurs move your mph marker closer to the actual shift mph. In the case listed above I would probably move it to 80mph and see if it still shifts at 85mph if so I might try to move it up another mph or two. I always change both the Part throttle & WOT shift mph tables to the identical # as to make things simpler.
- If the difference is RPM rather then MPH ie RPM marker is 6000 and actual rpm is 6500 & you actually wanted to it shift at 6500 you might be able to bump your rpms up a bit...or maybe not, but experiment a bit...just dont go overboard...remember the computer still needs time to shift.
- If #3 happened & you correct your UPSHIFT upwards now you can allow your downshift mph to follow a bit...use the 2d map in the part throttle shift mph table to visualize your shift patterns. I try not to affect the shift patterns much below 50% TPS because this is your crusing range & altering those areas could be detrimental to your gas mileage, but over that I try and parallel my upshift/downshift mph to an extent. Again don't go too crazy...I try and keep them about 5mph apart at each tps incriment as to not confuse the computer as to what gear to select. Again experiment a bit but use the 2d graph to visualize this as it has be a HUGE help to me and the 2d graph for up/down shifts arent even available in other editing programs making shift adjustments difficult at best