Electrics question ce1 88 mk2 golf gti

[danny_p]

if your running a wideband, you wideband will need a good ground.  and a +12v   fuel pump relay is a good sorce for this.

the widebands signal output goes directly into the ms.

you are really confuseing me with this live for the throttel switch bussness.   the ms itslef dosent use a throttel switch it uses the throttel position sensor if  your thinking of connecting +12v to that it's a really BAD idea if it dsent actual damage the ecu it will at least mean teh throttel is uncalibratable as in a car +12 volts is actauly a big lie  we often just refer to unregulated lives in cars as +volts as they can swing between 9v and 14.4v ( and possobly more if youve got a dodgey alt)   hence why V ref is used to supply a regulated 6v supply to the tps, so that the voltage returning down TPS sig is allway the same for the same throttel opening. 

tho the TPS is normaly just used for accsel inrichent unless your running in alpha N but even so tuneing your accsel inrichment won't happen  if running alpha N getting it to run would be a big achevement.

have you had a read of the MS manual if not would you like me to chuck some links up ?

[emery1990]

Ok thanks Danny.

Sorry,the throttle switch, not connecting it too ms at all, but the actual throttle switch needs a live and ground doesnt it?

Oh ok then, connecting the wide band up sounds pretty simple then, needs a live and ground and feed to the ms.

I have read it, been reading the tuning side of it though. The wiring bit of it Ive read too, is there anything specific I should be reading, ie go over it again and make sure I fully understand it.

[danny_p]

the throttel position switch dosent get connected to a 12 volt live. it gets connected to a +5 live that comes from the ecu itself

[rubjonny]

are you talking about the old 2 pin throttle switch on the back of the abf throttle body? if so you dont need to do anything with it, all megasquirt needs is the 3 pin tps on the front. the tps has 2 wires direct to the megasquirt ecu (pin 22 and 26 I think?) 3rd wire you run to ground.

[emery1990]

Yer thats the one I was on about 

Thought I still needed it, cheers.!

[emery1990]

Just ordered my ecu relay and holder, the man at vw was an idiot, but he said is it the 9 pinned one you wanted, I didnt know they came in different pins, I still just ordered it, will it be ok or should I cancel it. Should come tuesday hopefully.

Target is too get it up running before end of this month otherwise my old man said its going to the crusher!

[rubjonny]

9 pin should be ok, you just use the pins you need. all the sockets ive used have tons o holes in, just pop pins in the sockets you need to use.  just a case of seeing if the relay will fit in it, if it will happy days

[emery1990]

He said he needed to know whether I wanted a 9 pin so that he can order the correct holder.

and thanks

[emery1990]

Got thr relay and holder now, just got to get them spade bits from pole vault, forgot to order them 

How do I know what wire goes to what connection, on the diagram it looks like 3 and 5 are switched and 1 and 2 just connect inside the relay?

Also what amp spade bits do I need?

[emery1990]

Mine looks like this, should I wire it up like this, as I understand this, apart from the constant power bit. Should I just create a new wire from the battery for this, if so what size wire would I need.
http://www.mp3car.com/vbulletin/faq-emporium/117895-faq-relays-how-they-work-how-wire-up.html