New tires. 2" shorter. Need your help.

Reply Subscribe

Thread Tools

Search this Thread

Dec 13, 2012 | 04:31 AM

custm2500

Thread Starter

Ph.D. in HUBRIS

iTrader: (10)

Joined: Mar 2009

Posts: 4,087

Likes: 5

New tires. 2" shorter. Need your help.

I installed my 20" wheels with a slightly shorter tire last night. The truck loves to sit on the limiter before shifting now. Is tire diameter the only thing I need to change in the tune?

Thanks in advance!

Dec 13, 2012 | 08:23 AM

nonnieselman

TECH Senior Member

iTrader: (10)

Joined: Oct 2004

Posts: 14,068

Likes: 2

From: Crystal Springs, MS

change the tire size so it adjust all the trans shifting tables.

Dec 13, 2012 | 08:55 AM

custm2500

Thread Starter

Ph.D. in HUBRIS

iTrader: (10)

Joined: Mar 2009

Posts: 4,087

Likes: 5

perfect. THanks. Will do.

Dec 13, 2012 | 09:24 AM

sprayedenali

TECH Fanatic

iTrader: (11)

Joined: Dec 2009

Posts: 1,573

Likes: 0

From: Birmingham, AL

The rpm/mph will probably be off as well...

Where before if you were wanting to shift at say 6000rpm/55mph now 6000rpm would be at 50mph...

Dec 13, 2012 | 09:35 AM

nonnieselman

TECH Senior Member

iTrader: (10)

Joined: Oct 2004

Posts: 14,068

Likes: 2

From: Crystal Springs, MS

i was hoping when he adjust the tire size it would correct the part and wot MPH shift tables.

Dec 13, 2012 | 11:02 AM

sprayedenali

TECH Fanatic

iTrader: (11)

Joined: Dec 2009

Posts: 1,573

Likes: 0

From: Birmingham, AL

Does it do that?? I've honestly never noticed...

Dec 13, 2012 | 11:24 AM

nonnieselman

TECH Senior Member

iTrader: (10)

Joined: Oct 2004

Posts: 14,068

Likes: 2

From: Crystal Springs, MS

EFI live will if you click apply haha..

never fooled with HPT that much.

New tires. 2" shorter. Need your help.

New tires. 2" shorter. Need your help.

Trending Topics