Speedometer correction tune

[Michaelquerty]

I got a Livernois tune for my car last year and I love it. The power is great, but I recently encountered an issue with the tune after I swapped out my stock size tires for some 205/45/17 Continentals. I submitted a tune request and they sent me a tune that corrected the speedometer but created other issues. The tune had the engine revving up between shifts in lower gears for a second or two occasionally. I got a revision and it did the same thing. Any thoughts on what is going on with the tune?

 

[CanadianGuy]

Are you sure its the tune? If you revert back to the pre speedo fix tune does it continue to do it? To be honest 205/45/R17 there is not enough size change for the speedo to be affected. You get teh same amount of change from under/over inflated tyre or worn tyres. Thus is the pre speedo change tune works keep it.

 

[Joker328]

Are you sure its the tune? If you revert back to the pre speedo fix tune does it continue to do it? To be honest 205/45/R17 there is not enough size change for the speedo to be affected. You get teh same amount of change from under/over inflated tyre or worn tyres. Thus is the pre speedo change tune works keep it.

I mean it's definitely enough to affect it. It's about 2 mph at 60 mph. Not sure I would bother getting it retuned for that, but it's not nothing.

 

[CanadianGuy]

I mean it's definitely enough to affect it. It's about 2 mph at 60 mph. Not sure I would bother getting it retuned for that, but it's not nothing.

Understood. Just saying to go back to your old map to prove it's a map thing and not a car thing. If it's a map thing they can figure it out.

On a side note when I check the true diameter of the stock bs the federal RS-r at 205/45R17 they were almost identical. Look at the mfg spec sheet of the tyre you may find the delta is less then you think. Or maybe more.

 

[neeqness]

The tune is sort of a preference thing. There is a difference felt in driving with the taller wheel so the tune could help there (if desired) but I agree with regards to the speedometer. I don't think it's worth it just for that reason.

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