should I recalibrate for 285's ??
#3
Registered User
I never did mine, just be aware of it when in a speed trap area. I figure that I just rack up that many fewer miles on the odometer...... Also, it is off more than you think, probably about 5 mph when doing 70.
#5
Registered User
I would, had mine done for the 315s and then for the 285s. I like the OD and trip to be correct. Not sure if it really affects any shift points, but just feel better knowing that the computer is seeing the right speed/rpms. Just my .02.
#6
Registered User
Join Date: Feb 2006
Location: Between SC,TN,VA!!!
Posts: 886
Likes: 0
Received 0 Likes
on
0 Posts
I have GPS'd my 33-12.5-17 ProComps and they are Exact to what the speedo says! Onlt thing that I can think of is that the Speed Gauge was off from the factory!! These are roughly the exact same size as 285's!! Just GPS the truck with teh new tires and see what it says! JB
#7
Registered User
Thread Starter
Join Date: Aug 2006
Location: Adkins Texas
Posts: 187
Likes: 0
Received 0 Likes
on
0 Posts
yeah, I gps'ed it with 295 nittos and it was 4-5 mph off. They were a 33in tire. Took the tires back and swapped out for 285's , so it shouldent be much off. Was thinking more along the line of shift points, but our trannys are crazy and have their own minds anyway
Trending Topics
#10
Registered User
Join Date: Apr 2006
Location: Beaumont Alberta Canada
Posts: 330
Likes: 0
Received 0 Likes
on
0 Posts
I have GPS'd my 33-12.5-17 ProComps and they are Exact to what the speedo says! Onlt thing that I can think of is that the Speed Gauge was off from the factory!! These are roughly the exact same size as 285's!! Just GPS the truck with teh new tires and see what it says! JB
X2, speedo is bang on with the GPS 305/65-17 (33x12.5-17) PROCOMP X-AT's,...when I had the 285 BFG AT's I was 2% over...
#11
Registered User
Join Date: Jun 2005
Location: Nebraska
Posts: 2,452
Likes: 0
Received 0 Likes
on
0 Posts
Why not have it accurate?
Remember guys, it's not a set value difference. It's a percentage. If you're 5% off at 30mph that's only 1.5mph, but at 70mph, it's 3.5mph.
Remember guys, it's not a set value difference. It's a percentage. If you're 5% off at 30mph that's only 1.5mph, but at 70mph, it's 3.5mph.
#12
The shift points are higher, so it depends on what I'm doing at the time. TC lock is now at 52 instead of 49. It really didn't changed things much, but it seems like the computer now compensates for a little planned power loss with letting the motor get a hair further up in the power band.
#14
Registered User
Anyone know how much it costs to have the dealer re-calibrate your speedo if you take it in? I've tested mine by driving next to 3 different vehicles at 65-80 MPH and I was spot on but I'd like my odometer/trip to read right...
Thanks for the input!
Thanks for the input!
Thread
Thread Starter
Forum
Replies
Last Post
EPCO
3rd Generation Ram - Non Drivetrain - All Years
1
06-09-2009 02:22 PM
taken5875
Performance and Accessories 2nd gen only
2
11-17-2008 10:48 PM
lawnman757
3rd Gen High Performance and Accessories (5.9L Only)
8
01-10-2008 12:45 PM
whitetrash66
3rd Gen High Performance and Accessories (5.9L Only)
3
07-11-2007 02:17 PM