engine rev counters.

[dodger]

im looking for a rev counter but on ebay the shop sellers are putting in smalls this will not work on, v8 rover mini and any leyland , i ask them why they tell me its the pulse, what the heck are they talking about, can some one point me in the right direction for a counter please is got to be a after market on as its got to go on a trike , thanks...

[stevieturbo]

im looking for a rev counter but on ebay the shop sellers are putting in smalls this will not work on, v8 rover mini and any leyland , i ask them why they tell me its the pulse, what the heck are they talking about, can some one point me in the right direction for a counter please is got to be a after market on as its got to go on a trike , thanks...

Be more specific please

What engine do you have, what ignition system does it use ?

[dodger]

3,500 e reg efi flapper made engine with efi removed and old dizy and coil with su carbs.
basically the older typ ancillarys from the lates 70s with a newer 90s engine.

[dodger]

email sent to day,
have you tried any rover online forums? It does differ from the audi v8 as the audi v8 has a standard pulse train. We are not clued up on the rover pulse train but we do know it confuses our rev counters as they require a steady pulse train from the coil. The rover engines have an irregular pulse train and need a rev counter which can take this pulse and make sense of it. Our counters do not have this capability.
??????? i need some help under standing this , thanks

[ChrisJC]

I suspect it means that on the Audi, the rev counter is driven from the ECU with a regular signal.

On the Rover, the rev counter is driven from the coil -ve.

The difference being that the Audi signal will be 'high' for 50% of the time and 'low' for 50% of the time as it's synthesised by the ECU. The Rover has variable 'high' and 'low' times to get the best from the coil.

Basically, you need a rev counter that can be driven directly from an ignition coil (which to be fair I thought used to be normal for aftermarket stuff!) I guess this distributorless ignition has changed the game a bit.

Chris.

[stevieturbo]

I still dont get it ?

Virtually any aftermarket rev counter will work. Or is it some strange rev counter you are after ?

There are a multitude of them.

Is there any particular style ? or what do you need ?

[dodger]

well this is why im so booming confused, this is the item n0 have a look and a read and tell whats going pleas i would like to get a set of them but it seems i may not as the rev is the problem
380302809684
http://cgi.ebay.co.uk/Rev-Counter-Tacho ... 588bd05a54

[dodger]

I still dont get it ?

Virtually any aftermarket rev counter will work. Or is it some strange rev counter you are after ?

There are a multitude of them.

Is there any particular style ? or what do you need ?

you dont get it lol i dont as well so the link is there , the Audi was just a reference as an example of engines.

[stevieturbo]

I wouldnt be buying cheap crap off egay in the first place.

More than likely, 99% sure any of these will work off a conventional coil trigger.

http://www.demon-tweeks.co.uk/Motorspor ... eters/1777

[DaveEFI]

email sent to day,
have you tried any rover online forums? It does differ from the audi v8 as the audi v8 has a standard pulse train. We are not clued up on the rover pulse train but we do know it confuses our rev counters as they require a steady pulse train from the coil. The rover engines have an irregular pulse train and need a rev counter which can take this pulse and make sense of it. Our counters do not have this capability.
??????? i need some help under standing this , thanks

You could use a resistor and zenner diode between coil neg and rev-counter. That would keep the pulses constant and at the amplitude set by the zenner - if that is indeed the problem.

[dodger]

I wouldnt be buying cheap crap off egay in the first place.

More than likely, 99% sure any of these will work off a conventional coil trigger.

http://www.demon-tweeks.co.uk/Motorspor ... eters/1777

i did look at that yesterday and found a tim at 42 notes but the small print says on single coils only, so again i need educating on this as never done this stuff before. thanks for the link. the other reason for eBay is if it get wet it can be slung if the top prise stuff gets wet and breaks down im out of pocket lotts. thats the only reason for ebay.

[dodger]

email sent to day,
have you tried any rover online forums? It does differ from the audi v8 as the audi v8 has a standard pulse train. We are not clued up on the rover pulse train but we do know it confuses our rev counters as they require a steady pulse train from the coil. The rover engines have an irregular pulse train and need a rev counter which can take this pulse and make sense of it. Our counters do not have this capability.
??????? i need some help under standing this , thanks

You could use a resistor and zenner diode between coil neg and rev-counter. That would keep the pulses constant and at the amplitude set by the zenner - if that is indeed the problem.

if i did go down this rout what rating would i need other than 12 v of corse,

[Ian Anderson]

ETB are good and will hold your hand all the way and discuss any queries you have for your fitment
http://www.etbinstruments.com/

Speedy cables make all the Smiths stuff
http://www.speedycables.com/index.html

An there are loads of others

Ian

[DaveEFI]

email sent to day,
have you tried any rover online forums? It does differ from the audi v8 as the audi v8 has a standard pulse train. We are not clued up on the rover pulse train but we do know it confuses our rev counters as they require a steady pulse train from the coil. The rover engines have an irregular pulse train and need a rev counter which can take this pulse and make sense of it. Our counters do not have this capability.
??????? i need some help under standing this , thanks

You could use a resistor and zenner diode between coil neg and rev-counter. That would keep the pulses constant and at the amplitude set by the zenner - if that is indeed the problem.

if i did go down this rout what rating would i need other than 12 v of corse,

It sort of depends what the problem is. Older rev-counters driven direct off the coil expect to see a large 'spike' when the spark happens - newer ones driven off the ECU a low voltage more controlled signal.

[stevieturbo]

I wouldnt be buying cheap crap off egay in the first place.

More than likely, 99% sure any of these will work off a conventional coil trigger.

http://www.demon-tweeks.co.uk/Motorspor ... eters/1777

i did look at that yesterday and found a tim at 42 notes but the small print says on single coils only, so again i need educating on this as never done this stuff before. thanks for the link. the other reason for eBay is if it get wet it can be slung if the top prise stuff gets wet and breaks down im out of pocket lotts. thats the only reason for ebay.

You are using a single coil !!!!!

And from what the egay link says, I can see little reason why it wouldnt work ?

I really dont understand how they can say it is "ideal for coil ignition systems" and also say it wont work on a multitude of cars with coils.

More than likely the person selling them hasnt got a clue about what he is selling.