OK..

Here's my findings so far.

BEFORE - Car used to get between 250 and 280km from "FULL" tank to the "EMPTY" light coming on (normally about 55lts) usually 19.5lts per 100km.
As I said, sluggish, under powered and constantly hunting around in the gears. Always had to drive with the "overdrive bypass" ON otherwise would constantly lockup in overdrive at 60kph.


NOW - From "FULL" to the "EMPTY" light......397km.......13.8lts per 100km.
Car has plenty of power, never struggles, holds gears beautifully. Able to drive around without having to use O/D bypass, (still need it sometimes at around 80kph), but otherwise fantastic.
Tested my speed against others to see if it was actually reading right, and at 60kph - sit with everybody doing 60, at 100 same and 110kph - sit with everybody doing 110. Checked against those "KM" signs on the highway, and each km from 1km to the 5km I passed the sign just as the odometer clicked over another km, so I'm pretty confident the speedo "IS" reading correctly.


Well, thats what it's done in my KJ.

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SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

So I can just go to the dealer and have them update my ECM with my new tire size? 265/75/16

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They should be able to.
Nice tyre size there.

PM sent

_________________
SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

I was at the dealer the other day & asked about my OD setting, they told me they put it to the largest setting it had. So I will have to drive with care to avoid any speed traps.

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Member No: 152595
Susky Bro V The Highlander Terminator, got it Wuggs

Lifted by CRDSTU
265/70/16 STT's on 16x8 Chrome Soft 8's
CDKJ

no not by tyre size mate


you have to give them the revs per mile figure, go to the BFG website and they list the tyre revolutions per mile at 45 mph THATS the figure you need

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http://www.cardomain.com/memberpage/742957
aussie KJ Lost No#150605
3" OME lift + Rancho RS9000xl's front and rear
prototype Airflow snorkel
Magnaflow cat back
265/70R16 Hankook MTRT03 on MOABS baby
4.10's and a truetrac up front
super skinks
coming soon
a myride wireless controller

Hey what about the LTD owner I've already paid to have a "Pinion Reset" done and I don't think anything has changed... "Got booked for doing 47 in a 40 zone" also I used to get 400km per tank now it back to about 370. When off road I always buy 98 octane it gives more grunt and more klicks.
Is thier any fiddles I can perfom on my ECU to get it to recognise that 245/70R17s STT's are larger than standard??

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2005 Limited Patriot Blue 3 1/2" Lift, 17" Cooper STTs, ARB Bullbar, JWS Disco's now needs some rails and armour ! Hey don't forget the detroit front lockers

Thanks Fouros, I had this done the other day. My speedometer is still a tad off but is much closer then it was before.

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I think the guy that did all this for mine said that the "limited's" dont have as many or any other tyre settings than 235/65/17 or 245/65/17 as they have the 17inch rims, there is less options in their original software.

On the way back from Coffs following Fros, I found that by his GPS mine was about 3 km slow, so I might get mine altered by a couple of revs per mile, but that was with WELL worn STT's, there's only about 4mm tread depth left, they have 15mm deep tread when new, so that means I've lost abot 20mm in overall diametre so thats a big difference in itself. That would easily account for 3-5 km out.

The main reason I did the alteration was for the running of the cars engine and gearbox not somuch having the speedo read right. The closer to correct the better your ECU will work. AS far as a work around, I don't think there is. unless there is a computer genuis out there that can crack the code used in the kj and make it so as we can access all vital ECU setting with a laptop (wouldn't that be cool). If the sofware in your kj dosn't have the options then unfortunatly its aftermarket devices that are needed. You can get a speed contol module that goes inbetween your speed sensor and ecu, you then alter the signal given to the ecu to dial in you actual speed. That would work fine as its the reading the ecu gets tht matters. I have read here somewhere about these controlers. can't find it at the moment.

Trick is to find a service guy that ACTUALLY knows what he is doing. I was told it was impossible to change mine, "can't be done" were the exact words, but, then I found a guy who did do it and it takes 5 minutes, that includes the time it takes to walk to the car.

cmohr

_________________
SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

Thanks cmohr,
I might look into getting the OBDII software and cable for ythe laptop and see if I can hack my ECU, someone must have for the power chips!

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2005 Limited Patriot Blue 3 1/2" Lift, 17" Cooper STTs, ARB Bullbar, JWS Disco's now needs some rails and armour ! Hey don't forget the detroit front lockers

Let us all know how you go with that Brian.
I've only seen OBD software that monitors system parameters like speed, rev, intake temp etc.

245/75/16 Bighorns this weekend so I'll book the car in for next week to get 667 revs/mile put in and check it with my GPS

Sorry Ed I think I have a typo there, ITS 677 rev. Thats if your model allows that kind of adjustment.

_________________
SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

Oh, thanks Chris.
Well I'll tell them to adjust it to 677 or to the tyre size.
Hopefully they can do one or the other.

I probably won't get a reply until it's too late (going to dealer tomorrow morning).
But would the revs per mile be different if I am running a 4.1 ratio diff?
I ask because my build sheet states I have a 4.10 diff.

Which dealer are you going to Ed?

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Member No: 152595
Susky Bro V The Highlander Terminator, got it Wuggs

Lifted by CRDSTU
265/70/16 STT's on 16x8 Chrome Soft 8's
CDKJ

Went to Lincorp @ Parramatta.
Waste of time.
My KJ has the speed sensor in the gearbox.
The newer KJ's with ABS take the speed from the ABS sensor.
Looking at my build sheet, I don't have ABS and my fueltank is only 18.5 US gallons (70L)

No, diff ratio will make no difference, that will be taken in to account by the ECU as there is a setting there to tell it which diff the car has. A particular wheel turns "X" many times per mile regardless of what diff, gearbox, engine is driving it.


Strange????? All Kj's have sensors in the gearbox and at the diff, thats where the problems lie when you change tyre size, the conflicting info coming from both. The abs sensor just tells the ECU when a wheel is stopping whilst the car is still moving, I find it strange (and unlikely -my opinion only ) that it would be used to sense actual speed. What speed would you be doing if you lock up one of your wheels??????? Notice when your in 2wd and you spin your wheels at the rear in soft stuff your speedo goes up but your not moving???? Sounds more like the "IT can't be done.......( "because we don't know how to do it" this is the part NOT said out aloud ) answer to me.


Ed, I probably wouldn't be so concerned in the CRD, as you have more gears and your peak torque is in around your general rev range. It's really more for the petrol v6 with the 4speed overdrive box that it really makes quite a substancial difference. But, having said that, it would be favouralbe to have your speedo reading correctly.

_________________
SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"

Yep I'm doing it mainly because @ 80km/hr on the speedo. My GPS is telling me I'm doing 88km/hr.
Might have to get a "second opinion" from Scuderia @ Chatswood.

Another question.
Is the speed sensor part of how it records your milage (odometer) reading?

YES. If your speedo is out, your odometer is going to be out too. If your speedo is reading "slower" you will record "less" kilometres than you have actually travelled.

That may sound good for resale, but, not good in a "Servicing" veiw, as your services would always be overdue, thus not good.

Also, it will give you a false fuel milage as well, you'll see the reading as less kilometres travelled per litre, making you think your using more fuel, but, you won't be.

_________________
SOME SAY

I'm Toight... Toight lik a Toiger.

And

When I go to the Toilet, Chuck Norris is there to tear the squares off for me.

"Pass me another one Chuck, and keep em coming!! On sencond thoughts..Go get the hose"