hoobahole Posted February 18, 2008 Posted February 18, 2008 Trouble with using a multimeter is the meter reading voltage and what the ECU is 'seeing' are quite often different! You need mapping software to set it correctly as the voltage the ECU sees is the important bit. Couldn't agree more mate Only problem is when using Weber Alpha your Knackered when it comes to that You're not knackered - you just need to know what to do I'll pop more detail up when I am at home. I've got a lot of time for Weber. Quote
hoobahole Posted February 18, 2008 Posted February 18, 2008 OKay - so a multimeter may not be completely accurate, but on my Weber setup there are 3 wires to the TPS. 1 reference voltage, 1 signal voltage, and a ground. The ref voltage should be either 5v or 0.5v - I can't remember. Assuming all weber units have the same ref voltage (! - assumption) then whatever percentage off the ref voltage you are, is the same percentage off the tager TPS voltage at idle you should set it at. That way - both yourself and the ECU are using the same ref voltage. Was that clear?....not sure now I've re-read it.... Quote
stu999 Posted February 18, 2008 Posted February 18, 2008 OKay - so a multimeter may not be completely accurate, but on my Weber setup there are 3 wires to the TPS. 1 reference voltage, 1 signal voltage, and a ground. The ref voltage should be either 5v or 0.5v - I can't remember. Assuming all weber units have the same ref voltage (! - assumption) then whatever percentage off the ref voltage you are, is the same percentage off the tager TPS voltage at idle you should set it at. That way - both yourself and the ECU are using the same ref voltage. Was that clear?....not sure now I've re-read it.... But it still doesnt 'guarentee' the reference voltage at the ECU - and as the lads said above, for that, you need the software Quote
perksy Posted February 18, 2008 Posted February 18, 2008 OKay - so a multimeter may not be completely accurate, That's the advantage with something like MBE Plug the laptop in, open up Easimap and you see EXACTLY what the ECU is seeing So you can then set the TPS accurately No Ifs No Buts No maybes Without the Weber software you don't really know, you just hope your right Glad your pleased with Weber Alpha Problem is *IF* ever you want to check whats going on with it, you'll be going to a Weber Alpha dealer Quote
Rory's Dad Posted February 18, 2008 Author Posted February 18, 2008 Silence from KT Green atm ... either the auto electricain hasn't turned up ... He didn't - should turn up tomorrow Rory's Dad Quote
hoobahole Posted February 19, 2008 Posted February 19, 2008 By following my advice - you are effectively calibrating you multimeter - against the ref voltage the ECU will read. You then apply any percentage diff between the ref voltage and the multimeter, to your TPS adjustment. There are no ifs/buts/maybes using this method. Agreed - for remapping you need the software - but not for TPS setting. Quote
perksy Posted February 19, 2008 Posted February 19, 2008 If your happy doing it that way you carry on mate To be fair with Weber Alpha you HAVE to use a Multimeter cos you ain't going to have the software to set it anyway Also with an Mbe system for instance and using Easimap, you can not only set the TPS accurately you can also check (and see what the ECU is seeing) : Crank sensor Air temp sensor Coolant temp Injector operation etc etc So it's not only for "re mapping" it's also very handy for diagnostic work aswell Like i said before glad your happy with Weber Alpha it appears to be a reliable system Personally i wouldn't retro fit it Imho it's good to see what's going on and check things when you need to Without having the expense of a visit to an authorised dealer Quote
greeny Posted February 19, 2008 Posted February 19, 2008 Silence from KT Green atm ... either the auto electricain hasn't turned up ... He didn't - should turn up tomorrow Rory's Dad b****y typical. Doesn't help that he's not a 'morning person'! Anyway, he turned up today and together we got it sorted as well as a couple of other minor niggles. Only problem with the TPS was that there wasn't enough adjustment using the standard holes, so they required a little modification. Nice car and it should fly through SVA now. Quote
stu999 Posted February 19, 2008 Posted February 19, 2008 By following my advice - you are effectively calibrating you multimeter - against the ref voltage the ECU will read. Nope. You are calibrating your multimeter against the ref voltage you hope the ECU will get to read Voltage checked/set at TPS doesnt necessarily equate to voltage at ECU Quote
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