Another tire recalibration thread...

[jwmaier1215]

Alright thanks guys!

I think you both are saying what I'm meaning, lol. Yeah I re-programmed it to 3.55 GR (my actual GR that I confirmed this morning with the VIN sticker). I just made a 60+ mile trip back to where I go to college and didn't have my GPS on me (I used my sister's GPS last night). So I have a homework assignment to get knocked out today and I should be free majority of the rest of the day. So I plan on using this opportunity to do a little exploring (I want to map out an alternative route home anyway). So I'll grab my gps and reprogram the tune to read 3.55 GR and 2709 tire size. Then I'll do the calculations and update sometime this afternoon.

And I NEED to do this at highway speeds, right?

Oh and yeah, I notice a 2-3 mph difference from what the gryphon reads and my actual speedometer reads. But 9.9/10 I use my gryphon as a speedometer anyway. Only thing I look at on the dash is mileage and where the gas gauge is.

One more quick question about the performance tune. It says a min of 91 octane is required. I have not ever ran premium gas through it. Will it make a huge difference running it vs. not running it? I went ahead and filled up with 92 octane a little bit ago (gas is cheap here, $3.49 for 92 octane, $3.29 for 89 octane).

[shotgun]

Since you're using the distance correction, speed doesn't matter. It's more important that you use a long enough test distance (10+ miles) to help negate any small GPS distance travelled errors.

I have never had the need (or desire) to use the 91+ tune, but you should feel a slight hp/TQ improvement (IIRC it's 7-15 hp).

Was your gas tank empty when you filled with 92 octane? If it was, I would wait (to change to the 91+ tune) until you've used about 1/4 tank to make sure you have all of the 87 octane out of the system.

If it wasn't empty (or real close), I would wait until the next tank before I changed tunes.