liamk wrote:is a 6k8 resistor still the correct value for completly bypassing the thermistor?
BillMcQuade wrote:Bobojo wrote:I'm about to do the single resistor mod on the mn.. 6k8 across pin 1 and 2.. Yl and bl wires leaving it a fixed 6k8 resistance .. As I don't have a scan gauge it's hard to see if it is working correctly.. Is this the correct resistance for the mn ?
Seriously? Have you read this thread?
You are about to fit a resistor of randomly selected value, and don't have the equipment to test your work.
I have personally seen an ECU fried from such random tinkering, and it cost the bloke over $2k for a new one.
For the price of a big night out on the turps, you can have a tested solution with warranty backup.
BillMcQuade wrote:Putting a higher resistance value on a circuit that may be outside of its designed load may (under the right conditions) cause damage to the circuit.
A through-hole resistor is not a component that is designed to work as a load bearing component, so taping one into a loom (where it also generates heat) is undesirable. A bamboo skewer support does not count as load bearing.
A resistor that suffers mechanical damage can sometimes suddenly increase in resistance, prior to going open circuit, causing a small high-voltage event (albeit at very low current). This may damage any IC in the circuit.
Some of the ICs on the circuit may be a lot easier to damage than you think. Sometimes, even a soldering iron placed onto the loom can introduce an undesirable stray current into the circuit. So if you are soldering in the resistor with the ECU connected, you are taking a huge gamble.
I can rattle off a few more.......
There also seems to be an insinuation by some, that people who are fitting the off-the-shelf modification are simpletons, who lack the skill to cut a wire and solder in a resistor, and that somehow fitting a 4 cent resistor to your $35k+ investment makes you more able/brave than us mere mortals.
I will come out and say it directly; I'm glad if the 6k8 is working for you, but at the end of the day, it is a randomly selected resistor that has been proven to be an incorrect value.
Surely it is time to lock this thread and be done with it?
Although you make some technically sound arguments on the circuit impedance, I can't agree with your statement. Neither one of us knows the exact schematic of the ECU, and changing the circuit impedance may have undesirable effects under certain conditions. Note that the whole of my post is painting a worst case scenario. I have seen some very strange things happen when playing with PCBs. They are built to a price, not a standard. If you wanted to sit down over a beer one day, I'm sure we could both swap stories over how the laws of physics seem to be ignored by some circuits (don't even get me started on RF).
I'm sure that you have secured your resistor very well, and yes, you could also use a bit of prototyping board and pot it afterwards. The vast majority of people simply solder the resistor into the loom, so this point is still valid.
Once again, I am painting worst case scenario when the resistor gets damaged. After all, it's not like the cheap SMDs in the circuit are isolated by optocouplers
Ask yourself; if you were selling the resistor would you be prepared to warranty that installing it in the most basic form (ie; taped into the loom) will not cause any damage? I wouldn't, and that is the option that I bet most people took.
And now I've added more sensationalism, and I forgot to quote the text. Bugger.
If you wanted to sit down over a beer one day, I'm sure we could both swap stories over how the laws of physics seem to be ignored by some circuits
koshari wrote:again the input to the maf is a simple dc voltage input protected by a voltage divider. your fearmongering regarding changing the impedance of the cct applies equally to the popular vondor supplied solution being provided to achieve the same outcome (which to your creidit is acknowledged in your last post.) . whilst i agree with your comments regarding RF and AC circuitry around modern circuits as a whole this isnt the case in this scenario. Capacitive coupling and induction issues are hardly going to be relevant here. in practice neither one of us needs to know the full schematic of the ECU as we are only discussing the input for the MAF value, and the resistor divider network is documented in the Mitsu Nonclementure that has been published likely without the copyright holders permission on many forums including this one.
we will keep optocoupler discussion for applications such as maintaining separation against different voltage grades in ccts such as switching power supply feedback signals to the pumping stage. having said that most optos i have seen fail were due to the open collector output being overloaded rather than the input side. massive digress i know.
well simple fact is i aint selling anything.
and maybe we could discuss the merits of beer brewed unter de Reinheitsgebot rather than synthetically brewed on such occasions or the worth of doing bode plots on our audio speaker cabling routes.
I don't know if the circuit incorporates any DC/DC conversion. If they are using a separate IC for modifying the signal to the main processor
Any discussion on phase or gain margin is always a deligh
appropriate dopant for p-type layers on GaN RF transistors
Reinheitsgebot oder Tod
Bazzer87 wrote:I'm not sure why I am following this latest debate on this thread. It makes absolutely no sense to me. I understand 1 in every 10 words. But it's fascinating. Kinda like listening to two people argue in a foreign language hahaha
Bazzer87 wrote:I'm not sure why I am following this latest debate on this thread. It makes absolutely no sense to me. I understand 1 in every 10 words. But it's fascinating. Kinda like listening to two people argue in a foreign language hahaha
viking shippy wrote:It reminds me of a cowpat in a paddock that the flys haven't found yet...
koshari wrote:Bazzer87 wrote:I'm not sure why I am following this latest debate on this thread. It makes absolutely no sense to me. I understand 1 in every 10 words. But it's fascinating. Kinda like listening to two people argue in a foreign language hahaha
fact is this is all you need to know,
it surpasses all other discussion.
http://www1.american.edu/ted/germbeer.htm
mad992 wrote:viking shippy wrote:It reminds me of a cowpat in a paddock that the flys haven't found yet...
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