Wasted spark no tacho

mhuk · Apr 26th, 2020, 11:03

Well I went with the BTI wasted spark and it's running but not yet been driven out.

Idle seems fine and it picks up well. However I have no tacho. I thought being a kit it would just work. It's 2nd hand kit and the seller has been a champ. I was semi aware of it maybe being an issue.

Anyone else running this wasted spark and got the tacho working?

Cheers

Martin

Jebus · Apr 26th, 2020, 13:46

There are a few ways around it,depends on the module that you have

Volvo_Utrecht · Apr 26th, 2020, 22:25

You need to add a relay.
I cab send you a picture

Chooch84 · Apr 26th, 2020, 22:48

Hi,

As Volvo Utrecht has stated, you'll need a relay, but then you'll need to take out the flappy bit, and connect to pins 30 and 87 iirc where your coil used to provide the tach signal before.

Laird Scooby · Apr 27th, 2020, 01:29

It might be worth checking the manufacturers website, there must be a signal somewhere to tell the fuel pump relay to start working via the fuel ECU (or have you changed that as well?) which only gives an output when it reads the pulses off the CPS.

mhuk · Apr 27th, 2020, 06:27

Morning all.

I cant even find BTI online to look at a manual.

Are we talking about this.?

In other news the car goes like stink.

Cheers chaps

Laird Scooby · Apr 27th, 2020, 07:38

Quote:

Originally Posted by mhuk

Morning all.

I cant even find BTI online to look at a manual.

Are we talking about this.?

In other news the car goes like stink.

Cheers chaps

https://cflomoto.com/pages/buchka-wa...n-instructions

Section 3 of that deals with the tacho output. It looks like you have the same picture as they have used, whether that's from the same original publicatioin or not i don't know.

Chooch84 · Apr 27th, 2020, 12:08

I’m using the BTI kit, but I’ve mounted it differently.

I’ll post some pictures up of the relay and wiring in a short while.

Chooch84 · Apr 27th, 2020, 12:43

From the original coil you should have a solid blue wire and a white/red(orange) wire.

The coil that you're now using, the middle wire in that plug needs to goto and be connected to the original blue wire. Both of those wires connect to the relay. The white/red(orange) wire connects to the other side of the relay. This should give you the Tach signal. See pictures attached.

Hopefully that helps!

mhuk · Apr 27th, 2020, 15:51

Massive thank you to all of you. That did the trick and now I have a working tacho. I will post some pictures of it later.

Funny how missing that gauge can ruin my driving plesure.

The power of the internet!

:-)

Apr 26th, 2020, 13:46	#2
Jebus VOC Member Last Online: Aug 13th, 2023 17:49 Join Date: Aug 2016 Location: Aberdeen	There are a few ways around it,depends on the module that you have __________________ 1992 2.0 SE Turbo Wentworth, now with b230ft & M90 2005 S60 2.0T the baby T5

Apr 26th, 2020, 22:48	#4
Chooch84 940 Noob Last Online: Yesterday 21:26 Join Date: Jul 2015 Location: Birmingham	Hi, As Volvo Utrecht has stated, you'll need a relay, but then you'll need to take out the flappy bit, and connect to pins 30 and 87 iirc where your coil used to provide the tach signal before. __________________ 96 945 Classic 2.3 LPT with some mods... To do: Install upper brace, Catch can, install sound deadening (50% done), Fit electric leather seats, repaint! List is endless... 16 BMW 330e Last edited by Chooch84; Apr 26th, 2020 at 22:56.

Apr 27th, 2020, 01:29	#5
Laird Scooby Premier Member Last Online: Today 01:11 Join Date: May 2012 Location: Lakenheath	It might be worth checking the manufacturers website, there must be a signal somewhere to tell the fuel pump relay to start working via the fuel ECU (or have you changed that as well?) which only gives an output when it reads the pulses off the CPS. __________________ Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........

Apr 27th, 2020, 12:08	#8
Chooch84 940 Noob Last Online: Yesterday 21:26 Join Date: Jul 2015 Location: Birmingham	I’m using the BTI kit, but I’ve mounted it differently. I’ll post some pictures up of the relay and wiring in a short while. __________________ 96 945 Classic 2.3 LPT with some mods... To do: Install upper brace, Catch can, install sound deadening (50% done), Fit electric leather seats, repaint! List is endless... 16 BMW 330e

Apr 27th, 2020, 15:51	#10
mhuk Senior Member Last Online: Mar 1st, 2024 08:41 Join Date: Mar 2009 Location: London	Massive thank you to all of you. That did the trick and now I have a working tacho. I will post some pictures of it later. Funny how missing that gauge can ruin my driving plesure. The power of the internet! :-) __________________ Volvo 940 19T, Charge cooled, Chipped.

Apr 26th, 2020, 22:25	#3
Volvo_Utrecht Volvo Utrecht Last Online: Yesterday 18:22 Join Date: Oct 2009 Location: Utrecht	You need to add a relay. I cab send you a picture

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