Compression Ignition Addict
Join Date: Sep 2007
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Loaded tune from SCT now speedo is way off
So a little background. Turbo went out about a month ago and had it replaced under warranty. Warranty paid for most of a Powermax turbo. Get the Powermax on and like most said had a little bit of low end lag. So went looking for a tune to get rid of the lag and be able to tow if needed. Decided to go with Matt's 8k tow tune. Tune is great, shifts nice, no more lag and the EGTs have dropped.
So now onto the problem. The speedo is now off, it says I am going about 5 mph faster than I am really going. Before the tune it was dead on. I had calibrated it using the Superlift Truspeed.
So what can be causing this??? I did notice that the SCT asked me if I would like to calibrate my speedo and I said no. I did change under the options section my tire RPMs and my gear ratio. But I thought that only changed the shifting points. Please help.....
2006 F250 8" inch Pro Comp, Top Gun Customz dual steering stabilizer, Bilstein 5125's, 4.30 gears Toyo MT 37's, Powermax, SCT X3 w/ Matt's 8k Tow tune, BPD 53 volt FICM, DC Power 185 alt, Superlift Truspeed, PMM coolant filter with Rotella ELC, Edge Insight CTS, MBRP 4", Line X'd bumpers, grille, and tonneau cover