dini_the_owl Posted June 4, 2007 Share Posted June 4, 2007 Just wondered if anyone could post up a close up pic of where there tacho sits when the ignition is turned on and the engine is not running...silly question i know but wasnt sure if it was dead on "0" or next mark up. cheers andy Quote Link to comment Share on other sites More sharing options...
merckx Posted June 4, 2007 Share Posted June 4, 2007 It's best to fit it back on when the engine is running , see where it is when the engine is started from cold and then put it back in the same place. It's not that important if you're slightly out. Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 4, 2007 Author Share Posted June 4, 2007 what if i never saw the tacho before i installed the new one? n/a tacho is different to the tt, any pics would help please Quote Link to comment Share on other sites More sharing options...
SimonB Posted June 4, 2007 Share Posted June 4, 2007 It sits at 0, but only because of the pin that stops it reading less. If you just line it up with zero it will read wrong. You need to get the car warm and then put it back with the engine running at the warm idle speed (800rpm or so IIRC). Quote Link to comment Share on other sites More sharing options...
Jake Posted June 4, 2007 Share Posted June 4, 2007 650rpm I believe, Si. That's what my e01 used to read the tickover as anyway. I'm sure it's more accurate than the stock tach Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 I would rather no do it that way as your then fudging the tacho itself to read what you want, the tacho has a preload when it gets a voltage feed as you may be aware, although there is no actual signal from the ignitor or ecu it still gets a power source which causes it to shift the needle to a position being either marker 1 or 2, I have had to change this as my old n/a one does not work the same as the tt as the signal is from the ecu not the ignitor, and with it being a new engine it does seem to be idling higher than usual as i can tell from the engine note once the thermostat has opened at warm idle, im gonna get her tuned anyway so i dont want to fudge the reading as it were. As i never saw the tickover before on this motor i just wanted to know where the rev counter sits when the ignition is turned on and the preload is activated, the engine must not be running though. any helpers please Quote Link to comment Share on other sites More sharing options...
SimonB Posted June 5, 2007 Share Posted June 5, 2007 I tried doing it that way but it ended up overreading. I guess even with the power on it tries to sit lower than 0 and is stopped by the pin. Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 Hi simon, yes you cant set the thing up with the power off definately as you stated, if you set it when its off the preload will kick in and it will set itself to around 2k,what you need to do is install the pannel without the needle and turn the ignition on,once it has power it needs to be pushed on at marker 1 or 2 this is what i need to know, but preferebly from someone who has completely stock dials....there must be someone? Quote Link to comment Share on other sites More sharing options...
SimonB Posted June 5, 2007 Share Posted June 5, 2007 Hi simon, yes you cant set the thing up with the power off definately as you stated, if you set it when its off the preload will kick in and it will set itself to around 2k,what you need to do is install the pannel without the needle and turn the ignition on,once it has power it needs to be pushed on at marker 1 or 2 this is what i need to know, but preferebly from someone who has completely stock dials....there must be someone? That's what I did, it still overread. Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 Shouldnt do mate, you just have to make sure its correct before making the last push else it will overead, its tricky but ive done many before Quote Link to comment Share on other sites More sharing options...
Nic Posted June 5, 2007 Share Posted June 5, 2007 Or revs the nuts off it until it hits the limiter and position it at 6800rpm. I've already got my coat.... Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 nice one not tried that yet but dont give me any ideas nic! Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 someone please......... Quote Link to comment Share on other sites More sharing options...
Ian R Posted June 5, 2007 Share Posted June 5, 2007 it sits in the dashboard Quote Link to comment Share on other sites More sharing options...
Jake Posted June 5, 2007 Share Posted June 5, 2007 It sits at 0, but only because of the pin that stops it reading less. If you just line it up with zero it will read wrong. You need to get the car warm and then put it back with the engine running at the warm idle speed (800rpm or so IIRC). 650rpm I believe, Si. That's what my e01 used to read the tickover as anyway. I'm sure it's more accurate than the stock tach I would rather no do it that way as your then fudging the tacho itself to read what you want, I disagree. Doing it that way makes it more accurate than the tacho previously was. If you know it's reving at say 650rpm and you fit the needle in that position it's gotta be right, hasnt it? Quote Link to comment Share on other sites More sharing options...
merckx Posted June 5, 2007 Share Posted June 5, 2007 I don't make much use of the rev counter . It's easy to judge if it's idling correctly and I always listen to the engine note when driving so I know when it's time to change gear. Surely just taking it off and putting it back on when idling to get it approximately right will be good enough. Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 5, 2007 Author Share Posted June 5, 2007 yes but if you dont know what the motor is reving at how am i supposed to set it up correctly,the only other way and im not sure it is possible to do it is attach an aftermarket tacho to the negative side of the coil or im sure theres a parallel feed to the diagnostics plug in the engine bay(poss black and white wire) i could use but i do not have an aftermarket one and im not totaly sure it would work anyhow as the coil and packs operate differently to the standard distributor, its a very simple request, im sorry i just need conformation. Quote Link to comment Share on other sites More sharing options...
Jake Posted June 5, 2007 Share Posted June 5, 2007 There's a pulsed feed from one of the ECU pins (#58 on the Pre-VVTi I think) that can tell you the true RPMs Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted June 6, 2007 Author Share Posted June 6, 2007 i dont have an aftermarket tacho which is a bit of a problem to find out using a possible signal, just thought someone would have looked for me by now tbh.....? thanks for your input anyway jake Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.