Jic Fes Sld?

[Digsy]

Marnin'

 

I had my dash apart again yesterday (getting really good at it now) and had a closer look at my KMH/MPH converter box, as fitted by JIC.

 

Its a unit made by FES (assuming that is the company name) and the model number is CK-DV-99

 

It has red and black wires for +12V and earth, and a yellow wire for the divided signal to the speedo / odo (only connected to the speedo on my car, as requested).

 

Thing is, it also has a grey wire which is labelled "ECU", which is not connected.

 

Now, I've not heard of FES. Is this grey wire just another divided signal (identical to the speedo one), or is it a proper SLD "capped" signal that I could feed to the ECU to delimit the car much like the HKS or TRL equivalents?

 

Bear in mind that I have an auto. I think Paul Booth's investigations showed that the HKS unit's connections to the auto box had nothing to do with the delimiting, rather a remapping of the auto shift strategy to make the most of the higher to speed.

 

I've tried a websearch with no luck. Comments from techies welcome!

 

(edited to correct names - doh!)

[Matt Harwood]

The colour coding is the same as the one on my wifes FTO. From what I can gather from the grey wire is a "through" wire that you can connect to the ecu so it operates normally.

 

Could be wrong... In fact, I probably am wrong, but that's what I was told. Incidentally, the speed limiter is still active on her FTO.

[Terminator]

Mine was fitted by JIC or their local fitter, but the label has been deliberately torn off, I could not understand why. I will take a pic the next time I am behind the dash, to see if anyone recognises it.

[Digsy]

Originally posted by Matt Harwood

Could be wrong... In fact, I probably am wrong, but that's what I was told. Incidentally, the speed limiter is still active on her FTO.

 

No, that makes sense because when I interrogated them the JIC guy said they just connected the divided signal to the ECU via the odometer (with all the associated side effects that don't need repeating here). Hence my asking them to convert the speedo only.

 

If the grey wire was a "proper" delimiting signal it would have made more sense for them to use that instead.

 

[Matt Harwood]

I think most of these delimiters are actually a con. I think all they do is move the limit from 180 kmph to 180 mph and as most people would never get to that kind of speed they get away with calling it a delimiter.

I assume that the HKS speed limit defencers actually do remove it but I don't know for certain. They might just slow the pulses to raise it to something totally unaccassible in terms of speed but give the correct signals to the parts that operate with speed.

I'm sure Pete knows more about this though.

[Digsy]

By way of background info (very brief because this has been covered loads of times before - the search function will probably return a Lord of the Rings sized tome of information):

 

The most common way that an importer (including JIC) uses to delimit a car is, as Matt says, by raising the limit to 180mph by feeding the ECU with the same divided signal as goes to the speedo. On the Supra this is especially easy because the ECU gets its speed signal from the odometer.

 

However, because the whole car now thinks it is ging at 5/8 of its true speed, this affects all the other speed-related systems: PAS, cruise, active spoiler, and on auto cars - the gearbox. See the TRL website for more information. Additionally, if you could get to 180mph the limiter would cut in again (not a huge problem for most of us).

 

For this reason I specifically asked JIC to only convert my speedo to read in MPH. This in isolation does not affect anything else. At the time the only alternative was the HKS system (£150 approx) and I didn't want to spend that sort of money for the time I spend driving at 180kmh plus!

 

The accepted "proper" way to delimit the car is to use a gizmo that allows the speed signal to enter the ECU unaltered until just before the limiting threshold, at which point it is "clamped". For example, the ECU sees the true speed up until, say, 179kmh and then no matter how fast the car goes the ECU continues to see 179kmh. Thus the inbuilt limiter *never* cuts in.

 

HKS use this approach in their SLD (plus some other gubbins that talks to the auto box, and seems to modify the shift strategy). Pete Betts makes a unit that delimits in the same way but costs about half as much (plus the instructions presumably come in English!)

[THOR Racing]

Darren is spot on. Yes my SLD does delimit by clamping the frequency of the output to just below the normal speed limit threshold. Also the intsructions are in English and you are only a telephone call away from help.

 

Regarding the initial question. I think the grey wire is a through wire as someone suggested and not a clamped wire.

 

 

http://www.trlperformance.com/dsc.html

 

You've probably all read them before but info on speedos and stuff can be found on my sites

 

http://www.trlperformance.com/supra and click on speedometer conversion. or on the above DSC link.

 

Pete

[SimonB]

I used to have a bog standard convertor which meant the PAS was wrong so I bought one of Pete's units to restore it and still delimit the car. The steering with the correct amount of assistance is SO much better than before. Quite amazing difference really.

 

Anyway, for interest I have a facelift 97 import and I don't have a separate odo and speedo. The odo is an old fashioned job in the middle of the speedo. There's just one wire carrying the speed signal in to the combined unit. I should have taken a photo and written down which wire it was I suppose. So if you've got a facelift car then Pete's instructions won't be quite right...

[THOR Racing]

and I think the mechanical odometer on the facelift MkIV and the 2.5tt MkIII is driven by a stepper motor and is thus controlled electronically via the same speed signal.

 

So it would be possible I think to convert the odometer to miles, if the conversion doesn't already do this.

 

Pete

http://www.trlperformance.com/dsc.html