Factory Speed Limiter

[craig]

what speed are you doing when this kicks in mine does the same thing   but only some times  it  gets to  180 kph and just backs its self off ,i have a little black box  that  has been banging around    so i m thinking its that that has gone funny

[Adriansturgess]

I\'m confused...

when my car arrived from the land of the rising sun it had a HKS Speed Limit Defencer. It\'s a little device that was wired into back the ECU. I looked about on the net and it seems the sole purpose of this "Speed Limite Defencer" was simply to cancel out the speed limiter.

I can\'t see why HKS would bother making such a device if all you really need to do is cut a wire? Anyhow, not too bothered about it since I have a Apexi ECU now - which boviously doesn\'t have a speed limiter built-in  

Cheers
Jon

I think this must be the device that Rotechniks fitted to my car. I certainly had a bill for parts and labour. Does seem odd if it actually only needs a wire disconnecting.  :confused:

[nikp]

hmmm....maybe it\'s not that simple then. I dunno...i too am confused!

[TonyBlair]

Well, since I don\'t use the HKS de-limiter (as said in previous post I have an Apexi now) I would be willing to sell it on to whoever wants it.

I *think* I managed to download the wiring instructions for it some time ago - will have a look this evening.

Cheers
Jon

[Adriansturgess]

what speed are you doing when this kicks in mine does the same thing   but only some times  it  gets to  180 kph and just backs its self off ,i have a little black box  that  has been banging around    so i m thinking its that that has gone funny

180kph equates to 112mph. This is the speed at which the limiter cuts the fuel supply momentarily.

[WeasleRx7]

Well I would try cutting the wire myself, but since I have a converter fitted behind the dash I\'d need to exceed 180mph in order to know if it works!!!

Even if I found a private road long enough, I don\'t think my Rex is capable of any where near that speed!!!

[Adriansturgess]

Anyway you wouldn\'t know if the cut in power at 180mph was the limiter cutting in or your rotors beginning to melt. :rollin

[TonyBlair]

Not that my Rex could achieve 180mph, but I\'d hate to think what "fuel cut" would do to the engine at that speed.   :eek

[Pointman]

SO,    ...... the big question is, does anyone wish to try cutting this wire and finding out if the restrictor is removed, OR, do we all buy one of those Ebay kmh to mph convertors with the limiter removal ?

I personally don`t fancy cutting a wire, so my next question is, has anyone bought one of those ebay chips, and do they work ?

Thanks

[WeasleRx7]

My speed convertor does not remove the limiter, but it does fool the speedo and ecu into thinking that my MPH is actually only KMH.  This corrects my speedo gauge to read as MPH and effectively raises the limit to 180MPH.  So why would I need a speedo converter that also removed the limit completely?

The only reason I can see that a car with a standard ECU would need a limit removal, would be in the case of Nikp where he has actually changed the speedo guage to a MPH one, but the japanese ECU is still thinking the signal it\'s getting is KMH and so cuts the fuel at 180KMH (112MPH).

[WeasleRx7]

I\'m sure the EBAY chips with the limit removal will work, but why would you need it removed?  A car with a standard ECU will never exceed 180MPH!!!

[nikp]

do we all buy one of those Ebay kmh to mph convertors with the limiter removal ?

That\'s the problem: I can\'t! I have a speedo that already reads in mph! So, my only options are these:

1. Cut said wire.
2. Upgrade to Apexi PFC & commander!

Damn! These choices are hard!

[WeasleRx7]

My point about the speedo converters that also remove the limiter with a wire to the ECU is that they are completely pointless!  As if you\'re running a standard ECU then you\'ll never hit the 180MPH limit you get with a lesser converter, and if you have an aftermarket ECU to cope with the mods to get you to 180 then it\'s not got a limiter anyway!... If you follow me?

Back to the point of this thread....  How to remove the limit imposed by a japanese ECU when using a UK speedo?

Cut the wire?!!! (hee hee)

Buying an Apexi is an expensive option just to remove the limiter.

Just had a thought...  To remove the speed limiter on a Eunos Roadster all you do is remove a screw from the back of the speedo which breaks the connection from the speedo to the ECU.  This is effectively the same as cutting the cable.  So it could be just as simple as that on the REX.

[nikp]

hmm, i don\'t agree that just because you\'ve converted from kph to mph with a special converter that the speed limiter will be converted to 180mph - it depends upon where that feed is coming from. The feed going to the ECU may be the feed that comes from the gearbox directly - which is not specifically a speed (At least not in kph or mph). Therefore converting the speedo will make absolutely no difference to the speed at which the limiter cuts in.

I don\'t think i\'ve explained myself too well!

[WeasleRx7]

I\'ve got the answer.... Don\'t cut the green/black wire!

I\'ve just spoken to Tim and Ian at RX Motors.  The wire you want is the Green with a RED stripe.  It\'s on the lowest multiplug which is 11 pins wide. and if you count 5 pins in from the edge you will find a Green/red cable. Cut that one!!

Turns out the cable I thought it was is for the injectors, so not a good idea to cut that one at all!!!!