can a police cluster be recalibrated to a 3.7 diff?

Cooper69S · 19-03-2008, 04:07 PM

Gday all
can someone tell me how much the police cluster can be recalibrated? I'm going from 3.23 to 3.7 diff - could it be recalibrated to handle that, or if not, (hopefully this makes sense as I'm sure of the setup) could i change the speedo gear to a 3.45 one and recalibrate from there?

66 coupe · 19-03-2008, 04:22 PM

if its an auto, your best option is a speedo corrector, that way the shift points will remain correct, if you change the speedo sender gear, it will also affect the shift points, and it will tend to shift after its reached the rev limiter

FGII-XR6 · 19-03-2008, 06:32 PM

if you go a black gear it goes close to what you are after for 3.7:1and you can fine tune it with the police cluster here is a speedo calculator (I assume it is ok to post links from fordmods if this is a problem please feel free to delete the link) http://www.fordmods.com/forums/documents.php?doc=30

**Mechan1k** · 19-03-2008, 06:48 PM

My mechanic has used a black speedo gear as well when he is changed diff gears to 3.7:1.

GK · 19-03-2008, 07:03 PM

Quote:

Originally Posted by Mechan1k

My mechanic has used a black speedo gear as well when he is changed diff gears to 3.7:1.

This is the one to use on manuals as well as autos Yes! Would Bursons carry this item, or do I need to get it from Ford.

GK

66 coupe · 19-03-2008, 07:05 PM

Keep in mind your shift points will be out in relation to RPM if changing the cog as i mentioned above. In some cases the engine will be bouncing off the rev limiter before changing gears, or it will kick back a gear and be on the rev limiter. Only way to solve this is with a digital corrector

FGII-XR6 · 19-03-2008, 07:13 PM

what weird logic you use! a speedo corrector changes the number of pulses reaching the cluster and ECU but does it electronically correct? changing the gear also changes the number of pulses reaching the cluster and ECU but does it mechanically by changing the speed the sender spins at correct? the only difference is one costs $15 the other costs $125 don't get me wrong there is still a place for a corrector if you go to higher ratios but if you can do it with a gear save your cash. also the corrector corrects the pulses in 1% increments and thats what the police cluster does.the issue of shift points is valid to a point but will not be corrected with a speedo corrector the only fix for this is a flash tune where you can tell the ECU the diff ratio

Quote:

Originally Posted by 66 coupe

Keep in mind your shift points will be out in relation to RPM if changing the cog as i mentioned above. In some cases the engine will be bouncing off the rev limiter before changing gears, or it will kick back a gear and be on the rev limiter. Only way to solve this is with a digital corrector

ford only for the gear sorry

66 coupe · 19-03-2008, 07:30 PM

not weird logic, its the way to do it properly, its all in the wiring, by changing the wiring configuration behind the cluster with the digital corrector, you can correct the speedo signal to the cluster only, but still pass the original signal to the ecu / tcm so the shift points will be correct relative to RPM.

So, the cluster gets the corrected signal, and the ecu/tcm still gets the original signal, from the VSS with the orignial gear, matched to the ECU

FGII-XR6 · 19-03-2008, 08:20 PM

the way to do it properly is to change the gear and use a flash tuner to tell the ECU the correct diff ratio not hacking into the wiring harness

GK · 19-03-2008, 08:54 PM

Quote:

Originally Posted by Mechan1k

My mechanic has used a black speedo gear as well when he is changed diff gears to 3.7:1.

Quote:

Originally Posted by GK

This is the one to use on manuals as well as autos Yes! Would Bursons carry this item, or do I need to get it from Ford. GK

And so I quote you and myself again to re-ask the questions! LOL!

GK

FGII-XR6 · 20-03-2008, 01:57 PM

Quote:

Originally Posted by au3xr6

ford only for the gear sorry

I had already answered it for you

66 coupe · 20-03-2008, 02:03 PM

Quote:

Originally Posted by au3xr6

the way to do it properly is to change the gear and use a flash tuner to tell the ECU the correct diff ratio not hacking into the wiring harness

Yeah but theres about a 400 dollar price difference isnt there...

GK · 20-03-2008, 02:42 PM

Quote:

Originally Posted by au3xr6

I had already answered it for you

Ah, a review of the few preceeding posts has me at a loss to explain how I missed it! LOL!

Ford it is, many thanks.

GK

FGII-XR6 · 20-03-2008, 02:51 PM

Quote:

Originally Posted by 66 coupe

Yeah but theres about a 400 dollar price difference isnt there...

true but this is the proper way to do it (as you put it) hacking the wiring to me is never an ideal solution especially with some wiring jobs i have seen on cars. also you get a lot of extra benifits with a flash tuner

GK · 20-03-2008, 10:52 PM

I was told today that it can't be done with a gear, but that it would take a box that corrects the pulses sent to the cluster. $330 thanks for coming.

Darn expensive.

GK

66 coupe · 20-03-2008, 11:27 PM

GK, pm me if you want re the speedo.

FGII-XR6 · 20-03-2008, 11:58 PM

black gear will give you the correct speedo reading then just flash tune it with the correct ratio (IIRC you have a flasher)

Quote:

Originally Posted by GK

I was told today that it can't be done with a gear, but that it would take a box that corrects the pulses sent to the cluster. $330 thanks for coming.and they are shafting you the corrector is only $125 from shiftkits

Darn expensive.

GK

GK · 22-03-2008, 04:14 PM

Quote:

Originally Posted by au3xr6

black gear will give you the correct speedo reading then just flash tune it with the correct ratio (IIRC you have a flasher)

As mine is a manual, I wont need to flash it with the ratio right?

All I need is the speedo corrected, as with the manual, there's no shift points etc. Also the auto computer was replaced with a manual item.

So it's only the black cog I need? How hard to install?

GK

FGII-XR6 · 22-03-2008, 04:20 PM

Quote:

Originally Posted by GK

As mine is a manual, I wont need to flash it with the ratio right?

All I need is the speedo corrected, as with the manual, there's no shift points etc. Also the auto computer was replaced with a manual item.

So it's only the black cog I need? How hard to install?

GK

10 minutes work and yes in a manual thats all you need if you have a police cluster you can fine tune the speedo from there

CMYAU3 · 22-03-2008, 08:44 PM

gk go with 66 coupe on this one i did, i got the speedo corrector myself when i had my diff changed $120 bucks u cant go wrong man and in the future if u change the diff u wont have to pay for another gear. easy m8

also correct me if im wrong if u have a police cluster u dont need either, the police cluster already has the function to be altered??????????

so ive read in an old thread a coulple of months ago

GK · 22-03-2008, 10:57 PM

Quote:

Originally Posted by CMYAU3

gk go with 66 coupe on this one i did, i got the speedo corrector myself when i had my diff changed $120 bucks u cant go wrong man and in the future if u change the diff u wont have to pay for another gear. easy m8

also correct me if im wrong if u have a police cluster u dont need either, the police cluster already has the function to be altered??????????

so ive read in an old thread a coulple of months ago

Did you get the corrector from 66 coupe? Did you install it? Was the price including installation?

I don't have the police cluster. Sort of makes me want one though. The recalibration tool would be mighty handy!

I see you're in Melton. I work in Melton.

GK

FGII-XR6 · 22-03-2008, 10:58 PM

sorry but this just does not add up it is a manual car so no need to trick the ECU $15 for a gear ok say you do a few diff swaps 3.08 3.23 3.45 3.7 you already have the 3.08 gear so that 3 gears at a total of $45 and you don't have to hack your harness. on the other hand you buy a corrector and have to hack your harness for no good reason as you don't need to trick the ecu and you pay an extra $75 for the priveledge. i would advocate a police cluster over a corrector anytime as it is an original part designed for the job without hacking the wiring but in this case the cheapest the correct and the easiest way is to use a $15 gear really it's not rocket science. i see why 66coup is pushing the corrector as he sells them but in this case if he tells you it is the best solution it is a clear case of a salesman wanting to sell you his gear a manual does not need this device unless you go over 3.7 gears

Quote:

Originally Posted by CMYAU3

gk go with 66 coupe on this one i did, i got the speedo corrector myself when i had my diff changed $120 bucks u cant go wrong man and in the future if u change the diff u wont have to pay for another gear. easy m8

also correct me if im wrong if u have a police cluster u dont need either, the police cluster already has the function to be altered??????????

so ive read in an old thread a coulple of months ago

HLC · 23-03-2008, 08:40 AM

For sale section is this way V V V V

and only sponsors are allowed to advertise their products as such. all posts have been left for now, but they will be deleted next time.

StealthAu · 23-03-2008, 09:33 AM

Quote:

Originally Posted by Cooper69S

Gday all
can someone tell me how much the police cluster can be recalibrated? I'm going from 3.23 to 3.7 diff - could it be recalibrated to handle that, or if not, (hopefully this makes sense as I'm sure of the setup) could i change the speedo gear to a 3.45 one and recalibrate from there?

A police cluster can be recalibrated, if ypu have one there is no need to waste mone on speedo gear.

GK · 27-03-2008, 09:35 AM

I've ordered the 23 T gear from Ford and will be picking it up @ 10am. It's costing me $12. The stock gear had 19 Teeth and the spares guy @ Ford said each additional tooth is worth 5 kmph. My speedo will still be reading about 5 kmph fast, but that's a good safety margin I reckon.

Here's some pics of the stock gear. It's held in by a circlip that you lever up with a flat blade screwdriver.

Sorry about the large pics, Photobucket has been playing up and crashing Explorer every time I try to resize them. It's only been happening since Toyota started sponsoring the site! LOL!

GK

ClassicAU · 27-03-2008, 06:33 PM

Thanks for the tip GK, I just picked myself up a black 23T gear from Ford for ten bux on the way home from work tonight! What's the go with fitting it? Where's that how-to mate! :P

Evan

GK · 28-03-2008, 10:25 AM

Quote:

Originally Posted by ClassicAU

Thanks for the tip GK, I just picked myself up a black 23T gear from Ford for ten bux on the way home from work tonight! What's the go with fitting it? Where's that how-to mate! :P

Evan

Ev, I thought Jim Mock sorted yours when he did the conversion. Now that I know how to do it, come over and we can do it here if you want.

However, I'd check your speedo first against a mate's car. It might have been sorted already!

GK

ClassicAU · 28-03-2008, 10:29 AM

Nah mate, definitely not sorted all the way. They did fix it to an extent, as it was out something like 23km/h! It's still out 8km/h at 100km/h actual speed. I have verified this against my GPS unit as well as the speed test on the freeway from Geelong a couple of times. I might give you a call tomorrow if your free, thanks GK!

Evan

GK · 28-03-2008, 01:12 PM

Quote:

Originally Posted by ClassicAU

Nah mate, definitely not sorted all the way. They did fix it to an extent, as it was out something like 23km/h! It's still out 8km/h at 100km/h actual speed. I have verified this against my GPS unit as well as the speed test on the freeway from Geelong a couple of times. I might give you a call tomorrow if your free, thanks GK!

Evan

If your car speedo is out 8% @ 100 kmph Evan, then the black gear with the 23 teeth is the wrong one. The Ford guy said that each tooth is worth 5 kmph. If you are only out 8 kmph you will only want one extra tooth I'd reckon.

Is the speedo reading 108 kmph @ an actual 100 kmph, or 92 kmph @ an actual 100 kmph?

GK