just installed my new x3 from justin , all i can say is WOW , it works alot better than i was expecting , just the way the tranny feels was way worth the money...... i have one ? my spedo is showing that i am going a little faster than i actually am , so do i adjust the revs per mile more or less ? i have 35x12.50 but i think they are actually 34.5x12.50....... please help.

 

Here is a link that discusses the issue, there maybe more. Here is one of those on-line tire calculators.

 

You adjust it more and I found the speedo calculators were way off.

 

Hey C-huck, what tune are you running? Mileage, tow, performance?

 

how long was your wait till you got the tunes?

 

I got my tunes from VMP in something like 2 weeks.

Then I had Justin write me another one, it came through e-mail within 2 days.

 

justin had my x3 out the door with my 3 tunes in 4 days ...... i couldn't be more happy

meangene , i'm running 87 per. and i also have 87 tow 87 milage for now .

 

I have the same 3 and I also ordered an additional 4th 91 performance tune. It really perks up the truck.

 

i got the same but with 89 octane and i didnt really notice the !WOW! factor as much as i thought.

 

i think most of the wow factor for me was with the trans. being that i have a lifted truck my tranny was just not shifting in the right rpm range . now if i could only get my speedo dialed in . how does 585 sound for revs per mile for 34.5x12.50x18 .

 

620 revs per mile works dead on for me with 35x12.50R18 BFG KM2's.

I just got tunes from Justin on Thursday, he did a great job, replaced tuned from someone else. Mine need a small tweak or two but over all they are great!

 

thanks brianjwilson , ill try the 620 .