Governer question

[TougeMS13]

So yesterday down a long stretch a mini, cl55 and myself were tooling along good, and I hit my governer / cutoff in fifth. Now, the speedo said a hair past 120, and my r-vit said peak 109. The r-vit is pulling speed from the ecu. Im running 235/40/17 in the rear, which speed is correct? 91 ka24de manual, stock ecu. Thanks

[180fan]

you should be hitting the governor around 115mph. Between the two of them, I'd say they're both a bit off. The cluster has a margin of error that's acceptable, and the ecu is thinking your tires are the same diameter as stock and will make its calculations accordingly.

[TougeMS13]

Well shat. Thanks for the info. Need to get cracking on my ECU flash. Sad to watch a mini pull away. Will have to check if technosquare or JWT can alter that diameter at the time of the flash.Thanks again

[SR20Essex]

don't roadrace

J/K... knock yourself out, just do it around a bunch of people like me so we can all go that fast and nobody gets hurt. Better yet do it at a track, thats more fun.