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 Post subject: Tacho advice
PostPosted: Fri Aug 03, 2018 10:09 am 
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Joined: Fri Aug 03, 2018 10:02 am
Posts: 8
ECU Model: S40 Pro
Hi there new to this great forum.

I own a Renault 19 16v but have fitted a Megane 1 2.0 f7r 714 engine with the wasted spark single coil pack setup.

I believe the original tacho just ran off the negative coil from the remix unit on the R19 engine.

What do I need to do to get this working in conjunction with the new engine setup and the S40 pro Ecu I am about to wire in????

Any advice would be great, thanks in advance

Neil


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 Post subject: Re: Tacho advice
PostPosted: Fri Aug 03, 2018 11:48 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1116
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
You can either get a tacho adapter which is triggered from the ECU tacho out, or follow this guide:
http://www.clubgti.com/showthread.php?1 ... ight=tacho


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 Post subject: Re: Tacho advice
PostPosted: Fri Aug 03, 2018 2:03 pm 
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Joined: Fri Aug 03, 2018 10:02 am
Posts: 8
ECU Model: S40 Pro
Thanks so much for the reply, will give it a shot! :D


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 Post subject: Re: Tacho advice
PostPosted: Fri Aug 03, 2018 2:32 pm 
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Joined: Fri Aug 03, 2018 10:02 am
Posts: 8
ECU Model: S40 Pro
Looking at the diagram on your link, don’t the diodes affect the signal back to the ecu to fire the coils? If you see what I mean?


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 Post subject: Re: Tacho advice
PostPosted: Fri Aug 03, 2018 7:58 pm 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2900
Location: Norn Iron
ECU Model: No ECU
Have you even just tried the tacho output of the ecu direct to the rev counter ?

Good chance it will just work.


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 Post subject: Re: Tacho advice
PostPosted: Sat Aug 04, 2018 2:18 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1116
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Spryboy1974 wrote:
Looking at the diagram on your link, don’t the diodes affect the signal back to the ecu to fire the coils? If you see what I mean?


Not sure what you mean.
It works, I've used it on my Golf.


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 Post subject: Re: Tacho advice
PostPosted: Sat Aug 04, 2018 1:17 pm 
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Joined: Fri Aug 03, 2018 10:02 am
Posts: 8
ECU Model: S40 Pro
Not up and running yet so not had a chance to test the ecu output.
Am at the point of wiring where I want to keep it as neat as possible so was hoping to only do the once.!?

Neg side of coils go back to ecu yes?
Just thought if diodes in-line will affect it??
Or do I run 2 sets of leads coming off the neg coils 1 for ecu and other for tacho?

Sorry if I am being dumb just not done this before.


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 Post subject: Re: Tacho advice
PostPosted: Sat Aug 04, 2018 2:01 pm 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1116
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
Two wires per coil signal.
One from ECU to coil, then spliced from coil to tacho. The diodes will be on this splice.


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 Post subject: Re: Tacho advice
PostPosted: Sat Aug 04, 2018 2:30 pm 
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Joined: Fri Aug 03, 2018 10:02 am
Posts: 8
ECU Model: S40 Pro
Perfect thank you Alex that’s what I had in my head!?


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