Evening baypeeps, i've just fitted an old jaegar rev counter to my bus, the wiring is fine and it works ok. My engine is a 1600tp what should my tickover rpm be? at idle it looks like 600 on the tacho is this right? Also, when driving it feels like i'm giving it loads of right foot but the tacho is showing a relatively low reading of just over 2000 before i change gear. Is my tacho calibrated correctly? What is the rev range between gear changes anyway.. are there any factory figures available? thanks y'all hope you can shed some light for me!
Thanks guys, so the tickover ain't too bad.... the tacho was previously in a notch so i guess its set for 4 cylinders, it doesn't have any switches on the back though
I don't think your tach is working properly at all. Is it the voltage sensing type that connects to the coil? In neutral, revving the engine should easily send it up above 4000rpm, so summut's wrong somewhere. Was it off of an old British car?
think your on the right lines snotty, it is the type that connects to the coil. I thought it wasn't responding well enough.... any thoughts on what might be causing this? electrics isn't my strong point unfortunately, i have one wire to earth, one to instrument lights, one to -ve coil and one on the ignition circuit. i took my ignition feed from the horn circuit could this be the problem? what would be a better option (other than an evening course at my local college!) cheers!
Oh yeah, forgot to add about the 6 volt issue.... Would it also have come of an old mg? how can i tell? so many questions......
That sounds ok. What I'm thinking is that the rev counter is a current-sensing type as fitted to old Brit cars (being made by Jaeger is poss a clue) rather than one that's triggered by voltage pulses from the coil. I know nothing about them, other than that you can convert them. Have a google. Or it may be knackered, of course
If your transmission and wheels are standard you should see about 4500 at 30 mph in second and 3000 at 20 mph. Or if you connect 50 pulses a second you should see 1500 rpm. Some rev counter problems may be down to needing 5 metre wires to the rev counter unit from the ignition coil.
yeah mike, transmission is standard, running 195/65/15 tyres, not getting those kind of readings at all! It was fitted to a Notch before i bought it and was told it worked fine at the time...... if the feed was interupted from the coil could that change the reading? i need to check my connections i think..
^^good point!^^^ this is probably a dumbass question but the notch it was fitted to was a 1500, would my engine being a 1600 make a difference?
well, thats what he said....... hmmmmmmm, maybe that was too trusting! the notch had been in a front end smack, i've heard that can sometimes cause problems with guages but maybe thats not true either! just been out to check connections and blip the throttle, hitting about 2500 rpm..... maybe its fooked after all!
I have a setup where when the rev counter wire comes off the coil the counter sender unit in the engine bay will send low and erattic rpm readings to the PLX DM-6 multifunction display on the dash. Check there isnt a broken wire near the coil end - the pulses may be coupled by the wire picking up the ''radio interference'' from the ignition circuit.
cheers for the advice mike, i ran a new coil of wire from the coil to the counter... it was over 6m long, had to join it to another small length to then join the rev counter. replaced the smaller wire last night... results still the same could it really be the distance from the coil? if so are there any solutions?
