Should I re-tune?
06-12-2008, 03:52 PM
#1
2nd Gear Member
Thread Starter
Join Date: Sep 2006
Location:
Posts: 290
Should I re-tune?
went with 255/50/17 Nitto 555's in place of the factory 235/55/17 pirelli's. do i need to adjust the tire size with my predator and reflash? it's a totally different look too, the sidewall is much higher on the nitto and it's just a 50 instead of the stock 55. thanks a lot guys
06-12-2008, 07:56 PM
#3
6th Gear Member
RE: Should I re-tune?
Check the manufacturer's specs for tire revolutions per mile and compare that to the current setting in your tune. Change it if different. no biggie.
06-12-2008, 08:36 PM
#4
4th Gear Member
Join Date: Mar 2006
Location:
Posts: 1,138
RE: Should I re-tune?
ORIGINAL: Black Sunshine 07
went with 255/50/17 Nitto 555's in place of the factory 235/55/17 pirelli's. do i need to adjust the tire size with my predator and reflash? it's a totally different look too, the sidewall is much higher on the nitto and it's just a 50 instead of the stock 55. thanks a lot guys
went with 255/50/17 Nitto 555's in place of the factory 235/55/17 pirelli's. do i need to adjust the tire size with my predator and reflash? it's a totally different look too, the sidewall is much higher on the nitto and it's just a 50 instead of the stock 55. thanks a lot guys
06-13-2008, 04:04 PM
#7
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
RE: Should I re-tune?
Going from stock 742 revs/mile to 746 revs/mile should not make any difference.
At least not enough to warrant buying a tuner.
http://www.miata.net/garage/tirecalcold.html
At least not enough to warrant buying a tuner.
http://www.miata.net/garage/tirecalcold.html
06-13-2008, 05:54 PM
#8
4th Gear Member
Join Date: Apr 2007
Location: So Cal
Posts: 1,323
RE: Should I re-tune?
ORIGINAL: Riptide
The overall diameter of the wheel is now actually .14" smaller than stock.
And yes you should tune for it. If your speedometer reads 65 you are actually going 64.67.
The overall diameter of the wheel is now actually .14" smaller than stock.
And yes you should tune for it. If your speedometer reads 65 you are actually going 64.67.
NO retune. Unless you are plaining on raising your car with monster tires.
06-13-2008, 11:59 PM
#9
6th Gear Member
Join Date: Nov 2007
Location: Montaner
Posts: 6,193
RE: Should I re-tune?
If he has a tuner it's easy enough to fix it so it's 100% accurate. I know I would do it. I tend to agree that with such a small differential it's probably not worth buying a tuner if he doesn't already have one though. Doesn't everyone here have a tuner though?