Durite rev counter

DEFENDER90-DAZ · Oct 11, 2012

Just bought a Durite marine 0-4000 rpm rev counter to put in my 90

Think i know which point on the alternator is the 'w' connector.

Question is: how do you calibrate them so they read accurately??

Cheers
Daz

Jongould · Oct 11, 2012

DISCOVERY1-DAZ said:
Just bought a Durite marine 0-4000 rpm rev counter to put in my 90
Think i know which point on the alternator is the 'w' connector.

Question is: how do you calibrate them so they read accurately??

Cheers
Daz

Guess, there is a plastic screw in the back you turn to adjust the reading, I set mine up on idle at about 750RPM, autodate says 790+/-10

DEFENDER90-DAZ · Oct 11, 2012

Just thought: could link it to the alternator on my disco and adjust it so that it reads the same as the 1 on the disco dash at different rpm! Then fit it to the 90 "already calibrated" ?

Would that work?

Daz

666 george · Oct 11, 2012

Can't see why not. My disco does 70mph at 2000prm & I set the 90 up the same.
It only idles at 500rpm so it's a bit out.

DEFENDER90-DAZ · Oct 11, 2012

I'll give it a go when it arrives and will update the post when i've done it.

(think your might be out due to different gearing in the transfer box

)

Cheers
Daz

Jongould · Oct 11, 2012

DISCOVERY1-DAZ said:
Just thought: could link it to the alternator on my disco and adjust it so that it reads the same as the 1 on the disco dash at different rpm! Then fit it to the 90 "already calibrated" ?

Would that work?

Daz

Disco/defender runs different alternator pulleys so would be out, its done on alternator RPM compared to engine RPM....

DEFENDER90-DAZ · Oct 11, 2012

My alternator pulleys are the same and they are both 300tdi engines

Daz

666 george · Oct 11, 2012

DISCOVERY1-DAZ said:
My alternator pulleys are the same and they are both 300tdi engines

Daz

Mine's not

. Disco is a 300 & 90 is a 200.
They have the same transfer box but different size tyre.

DEFENDER90-DAZ · Oct 11, 2012

Ah it'll be the tyres then mate!

I'll calibrate it on the disco and then fit it to the 90, i'll do the calibration in neutral as my 90's fitted with 35" tyres

Daz

Becks Bear · Dec 18, 2012

DEFENDER90-DAZ said:
Just bought a Durite marine 0-4000 rpm rev counter to put in my 90
Think i know which point on the alternator is the 'w' connector.

Question is: how do you calibrate them so they read accurately??

Cheers
Daz

Daz

was thinking of buying this Durite 0-4000rpm rev counter, did u fit yours and is it working? the reason i ask i was told i need a rev counter that has dip switches on the rear to calibrate the rpm gauge??

many thanks

DEFENDER90-DAZ · Dec 18, 2012

Yep fitted and wired up - works a treat mate.
To sort of calibrate it i warmed the engine and set the rev counter at 800rpm at idle - sorted

trax · Dec 18, 2012

Buy an external tach or ask garage to do a reading and adjust. External ones are only around a tenner

DEFENDER90-DAZ · Dec 18, 2012

Its not easy to get an accurate rev count from a diesel engine as there isn't a pickup for a timing light type tacho......

trax · Dec 18, 2012

i was thinking a laser one with a strip on the crank bolt

DEFENDER90-DAZ · Dec 18, 2012

You got a link to one??

Not sure i've seen one before??

DEFENDER90-DAZ · Dec 18, 2012

One of these: New Digital Laser Photo Tachometer Non Contact RPM Tach | eBay

Looks a nice piece of kit

trax · Dec 18, 2012

Yeah that's what i was thinking. Nice and cheap too

trax · Dec 18, 2012

Test it on the disco to make sure it is accurate enough

DEFENDER90-DAZ · Dec 18, 2012

I can't as the disco has been sold............

Might be worth £10 to get the rev counter set up accurately........

trax · Dec 18, 2012

It's got a million uses.. how fast you can swing your arms, etc

Durite rev counter

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