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WS speed delimiter

 
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PW@Woodsport
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PostPosted: Thu Aug 03, 2017 2:57 pm    Post subject: WS speed delimiter Reply with quote Reply with quote including images

We're going to be making a small production run of cheap speed delimiters for all you import chaps.

It will not be a plug and play unit, some minor wire joining will be needed, but it will come with very clear instructions to make it idiot proof.

Price will be around 30 posted, pics/details coming soon.
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Gazza_DJ
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PostPosted: Thu Aug 03, 2017 3:17 pm    Post subject: Reply with quote Reply with quote including images

Will I need one for a UK car conversion? I'll be using Rev5 UK clocks if that matters.
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PW@Woodsport
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PostPosted: Thu Aug 03, 2017 4:04 pm    Post subject: Reply with quote Reply with quote including images

Hi Gaz, i'm not sure you need it at all, maybe you're confusing this with a speedo convertor kmh to mph?

This unit only gets rid of the Japanese import 112mph (ish) speed limit, it's not a signal convertor for the dash or anything.

My unit will mean no check engine light comes on if the speed signal wire was cut going to the ECU.

UK cars do not need this, it's for Turbos or NA imports only, it is also intended for V6 swaps that also have the speed limiter.
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Gazza_DJ
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PostPosted: Thu Aug 03, 2017 4:27 pm    Post subject: Reply with quote Reply with quote including images

PW@Woodsport wrote:
Hi Gaz, i'm not sure you need it at all, maybe you're confusing this with a speedo convertor kmh to mph?

This unit only gets rid of the Japanese import 112mph (ish) speed limit, it's not a signal convertor for the dash or anything.

My unit will mean no check engine light comes on if the speed signal wire was cut going to the ECU.

UK cars do not need this, it's for Turbos or NA imports only, it is also intended for V6 swaps that also have the speed limiter.


Apologies, I should have been more specific - I'm converting a Rev5 UK car to a Gen3 turbo so will be running a Gen3 Turbo ECU (from an import Mr2). I seem to remember someone saying that you don't need a delimiter if you have UK clocks but that may be complete rubbish [Laughing]
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PW@Woodsport
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PostPosted: Thu Aug 03, 2017 4:50 pm    Post subject: Reply with quote Reply with quote including images

Ah right, if you had a speedo convertor fitted, from KMH to MPH, it would effectively raise the speed signal max output to the ECU to roughly 180mph, so kinda works as a delimiter in its own right, although I can see a problem with the power steering or anything else relying on the output speed signal getting the wrong signal as a result of that, but this only applies to using KMH clocks with a convertor fitted.

In answer to your question about UK clocks, I believe they will be doing the same job as a signal convertor by artificially raising the output signal limit, your ECU is expecting a KMH 5v signal returning to it.... not something I have studied in great detail mind you so I could be wrong, but my hunch is you don't need a delimiter at all using UK clocks on a turbo conversion. It really is something I should automatically know the answer to!

Maybe someone else can chime in to confirm.
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jon
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PostPosted: Thu Aug 03, 2017 5:09 pm    Post subject: Reply with quote Reply with quote including images

Regardless of which UK or JDM speedo is fitted, the signal going to the ECU is the same. So a turbo will still have 180kph limiter if UK clocks are fitted.
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PW@Woodsport
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PostPosted: Thu Aug 03, 2017 6:54 pm    Post subject: Reply with quote Reply with quote including images

Thank you for clarifying Jon, so I guess you do need a delimiter after all Gaz.
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markstevieandmads




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PostPosted: Thu Aug 03, 2017 9:26 pm    Post subject: Reply with quote Reply with quote including images

Strange. I was told i needed the delimiter still when i converted my rev 2 turbo to uk clocks but i dont need it and have done 130mph+ on track with no delimiter.
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jon
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PostPosted: Thu Aug 03, 2017 9:54 pm    Post subject: Reply with quote Reply with quote including images

Both UK and JDM ECUs (Turbo and NA) expect the speedo signal to be in KPH.
I've reverse engineered the software inside the ECUs. All the code that checks the vehicle speed is identical between the UK 3SGE ECU and the JDM 3SGE ECU, apart from the extra 180kph limiter in the JDM ECU.

If there was a difference in the signal going to the ECU on UK cars compared to JDM cars I'd expect to see a difference in the various checks of vehicle speed in the ECU code.
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Mullen
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PostPosted: Mon Aug 07, 2017 12:38 pm    Post subject: Reply with quote Reply with quote including images

I'm interested in one for my 94 rev3 n/a auto import.
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b4ss




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PostPosted: Fri Aug 11, 2017 10:55 am    Post subject: Re: WS speed delimiter Reply with quote Reply with quote including images

PW@Woodsport wrote:
We're going to be making a small production run of cheap speed delimiters for all you import chaps.

It will not be a plug and play unit, some minor wire joining will be needed, but it will come with very clear instructions to make it idiot proof.

Price will be around 30 posted, pics/details coming soon.


Count me in for sure - I have a JDM Turbo in Ireland so just want to 112mph limiter removed.
Tony
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Gazza_DJ
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PostPosted: Mon Nov 13, 2017 1:12 pm    Post subject: Reply with quote Reply with quote including images

jon wrote:
Both UK and JDM ECUs (Turbo and NA) expect the speedo signal to be in KPH.
I've reverse engineered the software inside the ECUs. All the code that checks the vehicle speed is identical between the UK 3SGE ECU and the JDM 3SGE ECU, apart from the extra 180kph limiter in the JDM ECU.

If there was a difference in the signal going to the ECU on UK cars compared to JDM cars I'd expect to see a difference in the various checks of vehicle speed in the ECU code.


Having done my own 'tests', I can confirm that a UK car conversion is limited.

Put me down for a de-limiter Mr. Woods!
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