ATOYOTA Posted May 27, 2014 Report Share Posted May 27, 2014 Ok, so I've got this really rev-happy race engine on bike carbs and I'm after a tachometer that can match the revs with minimum jittering and lag. It's kinda hard to find information on this online because everyone's into fvcking turbos these days and throttle response is literally laughable (everyone I talk to laughs hysterically at the ludicrous idea of an engine actually making power, WHEN YOU BLOODY WELL WANT IT). What are some good starting points to look at? What are the racers using? I'd like to see it in action to gauge responsiveness before committing to buy and go to the effort of fabricating a cluster surround. Quote Link to comment Share on other sites More sharing options...
B.L.Z.BUB Posted May 27, 2014 Report Share Posted May 27, 2014 Something digital is probably what you need. Quote Link to comment Share on other sites More sharing options...
It's_AUDM_Yo Posted May 28, 2014 Report Share Posted May 28, 2014 All race cars these days use digi dash's which just run straight read out of the ecu but you don't have that option. What gauge do you have now? I would have have to assume the better known brands would be decent; defi, Omori, stack and most likely autometer Quote Link to comment Share on other sites More sharing options...
ke70dave Posted May 28, 2014 Report Share Posted May 28, 2014 Interestingly a digital gauge will add in some latency as opposed to a pure analogue gauge won't have that latency. But I suspect the stepper motor in a digital gauge will be faster than your regular analogue gauge. Quote Link to comment Share on other sites More sharing options...
GJM85 Posted May 28, 2014 Report Share Posted May 28, 2014 (edited) You need a diode in the tach signal wire. It will smooth out the jitters at all rpm on most tacos. I've got about 50 of them here. I tried marketing them once but no one seemed interested, so if you pm me some details I'll post you a few or ill bring some to all jap day in a couple of weeks, you can find me there. Edited May 28, 2014 by GJM85 Quote Link to comment Share on other sites More sharing options...
ATOYOTA Posted May 29, 2014 Author Report Share Posted May 29, 2014 The LFA/IS-F tacho is pretty damn impressive. I know I'll never get my hands on a bit of gadgetry like that but even lexus' needle gauges seem to be pretty quick. The sort of response I'm trying for is something like this: Stepper motor is the way to go; needle drop/lag from mechanical gives me the shits, not to mention every bump makes the needle jump a bit. Quote Link to comment Share on other sites More sharing options...
styler Posted June 1, 2014 Report Share Posted June 1, 2014 Never really heard of any problems with the tacho gauge itself, with decent brands anyway.... Might need to smooth out the signal as above if its from the coil but should be sweet after that. Quote Link to comment Share on other sites More sharing options...
ATOYOTA Posted June 5, 2014 Author Report Share Posted June 5, 2014 I'm really just trying to find one with a needle that can keep up. Quote Link to comment Share on other sites More sharing options...
styler Posted June 6, 2014 Report Share Posted June 6, 2014 The only thing I can think of for said jittering is fluid filled gauges but yet to see a tacho with it... Quote Link to comment Share on other sites More sharing options...
1969 SPRINTER Posted August 23, 2014 Report Share Posted August 23, 2014 If you are driving while its dark with a digital tacho, sometimes they can be annoying with all the LEDs pointing at your face. My mates HZ ute bushbasher has a dash I made out of sheet metal in it and the tacho is like a torch in your face at night. Not the we drive at night (no headlights lol) But the digi tachos are pretty good otherwise. Some of them come in pretty colours that you can match to your car as well. Quote Link to comment Share on other sites More sharing options...
parrot Posted August 23, 2014 Report Share Posted August 23, 2014 Old thread but... If you are happy to fabricate, why don't you source a tacho from a bike? I imagine it would be fairly compact. Quote Link to comment Share on other sites More sharing options...
Alexander4433 Posted August 26, 2014 Report Share Posted August 26, 2014 Hm.. Interesting to see. I hope that it is working out! Quote Link to comment Share on other sites More sharing options...
ATOYOTA Posted September 5, 2014 Author Report Share Posted September 5, 2014 Old thread but... If you are happy to fabricate, why don't you source a tacho from a bike? I imagine it would be fairly compact. Haven't been on much lately myself.. Yeah, a bike tach was actually something I had in mind too, considering how quick & high they rev (my engine goes to about 10 grand so that limits auto gauges a bit). Cheers for all the suggestions guys. Quote Link to comment Share on other sites More sharing options...
crunk81us Posted November 20, 2014 Report Share Posted November 20, 2014 i have an autometer monster in my hliux (ghey and i didnt put it in)... anyways, it is super fast. it is twice as fast as the factory unit in the dash.. (why is there a monster tach in an auto V6 4x4 hilux? f'd if i know!) Quote Link to comment Share on other sites More sharing options...
Dzhoel Posted November 21, 2014 Report Share Posted November 21, 2014 Either go digital for accuracy Or if you want thrifty, just get 3 or 4 speedos and average them all in your brain Quote Link to comment Share on other sites More sharing options...
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