Rev counter question

Post by **Ant-t** » 17 Mar 2016, 10:28

Just found this, it seems cheap but is it any good?

http://www.ebay.co.uk/itm/52mm-2Rev-Cou ... SwoudW1r9m

Its for a petrol 1.9 wbx

Post by **keynsham1** » 17 Mar 2016, 12:18

I have this exact one in my van. It is fine. It isn't particularly responsive, but then neither is my engine! My only issue is the blue backlight is very bright at night. It lights me up when I am driving! I have mine attached to the dash in its pod using a sticky number plate mount between the dash and the drivers door pillar.

Post by **Ant-t** » 17 Mar 2016, 12:31

Thanks for that, good to know that these are ok but the blue nighttime illumination sounds a bit off putting!

Post by **bigherb** » 17 Mar 2016, 13:02

Ant-t wrote:Thanks for that, good to know that these are ok but the blue nighttime illumination sounds a bit off putting!

They are very good for the price. Yes the illumination is very bright, I just fitted a 25k ohm resistor inline to tone it down.

Post by **ghost123uk** » 17 Mar 2016, 13:04

What is max recommended RPM for a WBX motor?

I'm thinking that one will never see more than half way up it's scale (not that it matters of course).

Post by **bigherb** » 17 Mar 2016, 13:49

ghost123uk wrote:What is max recommended RPM for a WBX motor?

I'm thinking that one will never see more than half way up it's scale (not that it matters of course).

5400 rpm, but there is not much over 4500, even less with a DF where all the torque is at the bottom.

Post by **300CE** » 17 Mar 2016, 19:20

I don't go anymore than 4k on mine, but I do drive like an old fanny:

Post by **keynsham1** » 17 Mar 2016, 22:17

bigherb wrote:
Ant-t wrote:Thanks for that, good to know that these are ok but the blue nighttime illumination sounds a bit off putting!
They are very good for the price. Yes the illumination is very bright, I just fitted a 25k ohm resistor inline to tone it down.

I am not an electrical specialist by any means so I was wondering if the resistor has to be a specific type...wire wound for example, or will any 25k Ohm resistor do? I imagine there is little current to deal with?

Post by **bigherb** » 17 Mar 2016, 22:30

keynsham1 wrote:
I am not an electrical specialist by any means so I was wondering if the resistor has to be a specific type...wire wound for example, or will any 25k Ohm resistor do? I imagine there is little current to deal with?

Just the normal cheap carbon or metal film resistors used for LED's

Post by **tobydog** » 17 Mar 2016, 22:40

Something like-

http://www.maplin.co.uk/p/metal-film-2w ... istor-d22k" onclick="window.open(this.href);return false;

2w should be more than ample

Post by **ghost123uk** » 18 Mar 2016, 07:54

1/8 Watt resistor (tiny) would be fine at the quoted value quoted above (~25K)

Post by **Ant-t** » 18 Mar 2016, 11:14

Thanks for all the replies and info

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