Thread: Auto Box question ? Can you program the box ECU ?

My international scout with a hot 354 cube with the 727 would scream we had mild cams headers 750 holly Double pumper dana transfer box 32 spline axles ,, i sold it to a bloke and said man this will bite if your not careful he hands me the money said in not a ###head and leaves ,,
Before he could transfer the car into his name my wife gets a visit from the police saying i have been a a accident and need to come identify me ,,,,,,

he made it 25k`s to forest road ,, left the rad hit a tree on the way home ,
Police said speedo was jammed on 190kph
road ran out ,,,
i shouldnt have said that this car will do 200+
his wife and her brother come around and blamed me for the crash ,,,,,

Not my fault /

If you want to change the boxes shift points, pressures, lockup points you need to fit a "Compushift" ... See Ashcroft website.

I find the box ok but I select 3rd and allow sufficient time for lockup before the hill starts. In 4th when it unlocks and revs high it will quite often drop to 3rd for a bit, then lockup 3rd (with the stick in D)

3rd lockup is just above 70 (stick in 3rd) but if it's unlocked in 3rd reving up a hill and your under 70 sometimes it will lockup as said above at 55-60 ... Yes,sometimes it has a mind of its own

If it's hilly terrain I select the gear ... wish it would lockup in 2nd !!!

Sent by iPhone using two tin cans and Forum Runner

"Compushift" Thats what i was after thanks

IMO that compushift is only for manual to auto conversions(see applications): http://www.ashcroft-transmissions.co...ompushift.html

it might not work on a original auto which already has the engine ECU - transmission ECU communication through the CAN which has to work as it was conceived otherwise the engine management will be affected and even if you have good shifting strategy based on compushift the engine will be powerless or go to limp mode and you'll have the flashing M+S on all the time... for less than half of that money you can tune your auto as to run beautifull IMO

Originally Posted by sierrafery

IMO that compushift is only for manual to auto conversions(see applications): Ashcroft Transmissions

it might not work on a original auto which already has the engine ECU - transmission ECU communication through the CAN which has to work as it was conceived otherwise the engine management will be affected and even if you have good shifting strategy based on compushift the engine will be powerless or go to limp mode and you'll have the flashing M+S on all the time... for less than half of that money you can tune your auto as to run beautifull IMO

Yep, but..
Tell the ECUs its Manual with Nanocom and then just wire up the compushift as per instructions for a Defender conversion.
No more M &S lights or limp modes.
But.. cruise control may have to be revisited, revised, etc. Id need to go back to RAVE for that one.
Theres' always a "but" As Sierraferry said- dollars keep getting bigger. Id be making sure all was operating within normal pressures and in good condition first.
Sure you wanna keep playing Rob?

Na ,,, was hoping it would catch fire so i got a couple of grand back ,,, so i could buy a 4x4 not a wire loom on wheels >

if your running higher boost gearchanges will also change as the ecu thinks its under more load


if your running 20 psi try bringing the boost down slightly I run 18 psi and to be a good happy medium while driving around town and hill approaches are nice as long as I don't allow to much boost


when torque converter locks up I feed power slowly and watch the boost gauge rise and my speedo will also rise ..if I go over 16 to 17 psi the gearbox then drops a gear even though my accealrator peddle isn't all the way down


to be honest there isn't much power difference at 20 psi and 18 psi but gear changes will change


I only run higher than 18 psi when off road

Cheers will drop mine down to 18 and see ,,,,,
funny thing now the dry joint in the fuse box is fixed it changes better ,,,
It was like the shift points were never in the same rev on the same hill ,,,,,

fingers crossed the gremlin is dead !