KPH-MPH Converter Required?? - 4G - Help Please

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Jul 16, 2014 9:17 pm

Hi guys,

Just swapped out my clocks in my JDM BB4 cos they were stuck on 129,999 miles & only go up to 120mph.

These are the old clocks..

And these are the new clocks..

They go up to 180mph..just like my first JDM - 12 years ago.

Only problem is, the speed now appears to go up in kph.

When I'm going about 40mph ish, the speedo reads 60mph. And when I'm going about 100mph (on private roads), it reads about 160mph.

So how do I go about converting this? And why did the old clocks go up in mph? Did they have an internal converter? If so, can this be robbed for the new clocks? Or do I need to wire some sort of converter into the loom?

They've obviously been used with an external converter at some point in the past, because they have an MPH label on them. So I know it can be done..just not sure how.

Ideas please.

I'm sure a few of you have had to overcome this before.

Thanks in advance.

Post by **paul72** » Wed Jul 16, 2014 9:50 pm

Well if u do end up needing convertor i must have it in mine somewhere as got paperwork to say it was done althou it still was not exact

'92 Si VTEC · Post by **jjmartin349571** » Wed Jul 16, 2014 9:50 pm

Not a helpful post sorry but how weird is it that your old clocks had the speedo in mph with kmh underneath, but the odometer in km

Is that an OEM face on them?

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Jul 16, 2014 9:52 pm

Yeah, they were pretty strange clocks. A very early production OEM edition.

Post by **Vtecmec** » Wed Jul 16, 2014 9:53 pm

Yes you will need an aftermarket converter, the new clocks you have are kph, just with a cheeky mph sticker added by someone.

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Jul 16, 2014 9:59 pm

Haha, thought as much.

One thing though..are there different converters for different dials? For example, these clocks read 180mph. If there were clocks that read 140mph, would the required converter be the same, or are there differently calibrated converters for different dials?

Or better yet, do you know where I can acquire the appropriate converter for my application?

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Jul 16, 2014 10:02 pm

Just seen this..but don't particularly want to pay that much for it..

http://www.ebay.co.uk/itm/251580674162

Post by **Vtecmec** » Wed Jul 16, 2014 10:06 pm

Just one type of converter needed, to alter the signal from the vss. ebay is probably the best place.

http://www.ebay.co.uk/itm/KMH-MPH-SPEED ... 35d9341149

Just a quick example, which seems quite pricey, if you cannot find one much cheaper, you might be better off actually getting some real mph clocks, which will read correctly straight out of the box.

CrunchyAdams82 · Post by **CrunchyAdams82** » Wed Jul 16, 2014 10:11 pm

If I get something like that one, will I still get vtec in 1st?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jul 16, 2014 10:11 pm

I assume I have a convertor on my breaker somewhere?

How much of a rush are you in to get it crunchy?