Remap

[Brian S]

My mechanic suggested I take my "Collie" to another local garage who does remapping.

Took it there yesterday for him to have a look and see if he can remap or not.
Unfortunately the answer was
Oh well, now would a 5 speed 120 g/box fit a 90, and would that improve mpg ??

 

[MarkW]

I believe the 120 box will fit, have a look on pradopoint

 

[AndycruiserguyLomas]

I believe the 120 box will fit, have a look on pradopoint

Will it now?? that would transform a Colorado, but would the cost put it up into 120 money anyway?

 

[MarkW]

I've seen some posts hinting at it although it could be a 6 speed manual swap from the 120 rather than the auto

 

[goodoldboy]

What we have here is a large , heavy brick shaped 4x4 .no amount of work will get you a significant MPG improvement.try working out your annual mileage x MPG & then do a similar calculation with a figure of say 10% less.Driving slower/smoother , fitting road tyres (defeats the point of having a 4x4 IMO) less weight etc will improve MPG bit if you want significant savings buy a Yaris

 

[Shayne]

More power and bigger wheels will improve mpg but only if you can resist enjoying the power .

When i say bigger wheels look at Beau's truck .

 

[Beau]

wouldn't really say bigger wheels would improve mpg. A 20 x 10 inch wide rim weighs a lot more than your standard 16" x 7.5 rim.

A less weight rated, more road based tire though may be lighter and help though, but come on, these things are work trucks. I make sure I have good weight rated tires.

On a side note, it would be interesting to see if a more modern auto box would work in these trucks. I feel they could benefit well with a 5-6 speed box, with a double overdrive gear.

 

[Brian S]

While I'm not looking for a frugal vehicle that does a 100mpg, I would like it to be the same as my old Trooper Duty.
It would do roughly 28 around the house's and about 33/35 on a run.
The only difference was the Trooper was a Turbo Diesel and it was a manual, other than that it ran on A/Ts, it had a roof rack, and it was always loaded with tools.
Now my thinking, (silly mistake ) was that a D4d is an improvement on a Turbo, therefore better mpg.
Allow for the reduced mpg for the Auto box, should bring me back to square one.

 

[silvercruiser]

the best i have had out of my 5speed auto 120 is 31mpg driving like a granny at 60/65
The best i had out of my colorado auto was 27mpg so is it really worth the ball ache to acheive 4mpg at best?

 

[MarkW]

your going to struggle to exceed the factory mpg without spending a fortune on some radical changes despite what some other threads claim.

Fully loaded on the way home through Spain last month I got roughly 25 but that's not at all scientific

 

[Brian S]

Rich, My Trooper was doing 28 round the houses, my Collie is doing 22 round the houses, (driving carefully) I would of thought they should of been near enough the same?
Not going to worry myself over it to that degree, but if I could of had a remap and got a few extra miles, it would of been good.

 

[Shayne]

wouldn't really say bigger wheels would improve mpg. A 20 x 10 inch wide rim weighs a lot more than your standard 16" x 7.5 rim.

I didn't mean exactly your rims Beau but my theory is say 255/85 on maybe a 20x8 rim would likely result in less rolling resistance than the standard set up . You travel a smidgen further with every revolution of the wheel and you have lengthened the gearing just a touch .

As you say these things are built for work and so they have heaps of torque and if you increase the power it will achieve the same distance with less effort = lower fuel consumption .

The 6 speed gearbox thing peeked my interest too so i looked up the specs and from memory 0-60 in 11.5 seconds and a top speed of 108 mph and as i can do that anyway it would make the 6th a gear nothing but a nuisance in my manual truck .

 

[MarkW]

6th gear would give you lower rpm at cruising speed , mines revving far too much at cruise really 70mph on the motorway is close to 3000rpm. Its not really for increasing speed or acceleration

 

[Shayne]

I get nervous about the 1kz at 3000rpm but i rarely see it unless i'm running late for a ferry or something

Peak power is either 3200 or 3600rpm i can't remember which but it might be both with/without intercooler ?

I would happily swap 1st gear for a 6th because 1st is all but pointless in mine .

R17 diffs which i think is 4.3 ratio and about 2800 rpm at 70

 

[MarkW]

I have R17 or 4.3:1 diffs so yeah its around 2800 - 3000 rpm at 70

 

[Shayne]

What size tyres do you run and how accurate is your speedo ? 285/75 put my speedo bang on accurate .

 

[MarkW]

265/70 and under read by 10% 265/80's would put the speedo spot on

 

[Chris]

What about an intercooler? I can't see from your Avatar or sig whether you already have a D4D

 

[Shayne]

265/70 and under read by 10% 265/80's would put the speedo spot on

There's a saving to be made there i think , assuming you drive frugally anyway considering the miles you do .

I cannot drive frugally but also i cannot accelerate for any length of time without changing up a gear if you see what i'm saying , a blip of throttle and i'm up to speed and cruising .

 

[MarkW]

Tbh its onlt really the long motorways when a taller gear would be useful, rarely get above 50 otherwise