Question for the teccies ?

[gsx600]

Does the thermotime switch play an important part in the running of the engine ?

Also what is the resistor pack doing - something to do with the injectors ?

Does the flapper system have an ir temperature sender in it or is the afm just the measuring the amount of air going in ?

Just asking as reading up on the megasquirt n spark ecu to see what bits I could remove

[dickymint]

Q1. nope except for the first 12 seconds of starting (and then only if its cold).
Q2. reduces voltage from 12V to 3V. to the injectors.
Q3. Good question, i used to think no but apparently it does!

wait for Wedg1e for the real answers

[adam quantrill]

Yeah the flapper has a temperature sensor for this reason: hot high pressure air pushes the flap just as much as cold but dense lower pressure air. But the AFM has to measure the air mass going into the engine. So the flapper deflection is combined with the temperature measurement to work out the mass of air.

[gsx600]

Thought as much for all.

Currently talking to a guy that could make the connections suitable for direct plug in for most of the features. Would just need to add wires for the Lambda sensor and the vacumn.
Hopefully make it easier and motivate me to actually upgrade

[leorest]

I knowI knowI know

Oh! you've beaten me to it!

Seriously though. I've spent quite some time reading up on this efi system as well as diagnosing it and can confirm the correctness of the previous comments.

I'd like to do the megasquirt thing myself. If you can do a good deal for two off then drop me a line.

Leo

[gsx600]

Do you have a junk ecu that could be utilized or would you want to do full wiring yourself.

I think there may be others here interested in the mega squirt kit and I know this chap is working on a 4.0l TVR as well as running his own 5.0l TVR engine using a megasquirt n spark - what I am going for. I will try and give more info on what I'm trying to do if anyone wants it, but basically doing it in 3 or 4 stages so I get used to playing with the system and what it can do for you.

Will approach him and see what he say's to a Wedge discount

[leorest]

I don't have a doner ecu though this sounds like the easiest solution, presumably this will allow backwards compatibility of just plugging the original ecu back in? Anyone got a duff ECU they want rid of?

[gsx600]

Yes backwards compat for the first stage of just fuelling I think - still waiting for more info and confirmation

As for old ecu look for aomething out of old Rover v8 or Jag V8 with knackered ecu as you really only need the housing and the connector, must be loads out there as it seems everyone on here has gone through at least 1 ecu swap

[leorest]

I'm still on the original one, though I have retouched every solder joint!

UMS looks like it could be interesting if they ever get it into production.

[leorest]

My intelligence advisers say there is an ecclesiastical personage interested in megasquirt.

Will Mr Shurvinton do a buy two get one free deal?

[gsx600]

Though he already had an aftermarket setup ? Although grumbles about unable to shange things

[rev-erend]

After market.. not yet..

Always looking at options..