Dual carb set ups - ?

[eight-six]

[quoute]If you put carbs on then you will be deriving the ECU of sensor information from the MAP/MAF and the TPS.
Without these informations the ECU cannot lookup the correct ignition advance reference on the ignition 3d map so you will be running with a set ignition timing i suspect.[/quote]

Pretty sure that’s how the system is currently configured. The TPS is just hanging loose, and almost certain the MAP sensor isn’t connected to anything.

Quote:It would be easy to test with a timing light and by revving the engine, just check if the advance stays the same.

Will see if I can borrow a timing light to check it out.

Quote:To use the OE ecu you will need to hook up a vacuum manifold and run the MAP sensor off it, along with the brake servo (i hope your car is MAP not MAF).

TPS

For the TPS signal I need to customise the spindle on the Carb so that as the Carbs open the spindle acts on the TPS and gives a throttle position reading? Is there any easy way of doing it or is down to how creative I can be? Do you have or know of any images which shows a TPS mated to a Carb spindle, just so I can get an idea in my head of how others have carried it out?

How would I go about resetting the values for idle and WOT, simple ECU reset or something more complex. I presume by you saying I need to reset the values – the ECU would read what the new TPS value of idle is and then when WOT it would register the TPS WOT value? After that its job done or is it more complex?

I suspect its best I do a test on the TPS first to check it is still functioning and sending a reading to the ECU? What’s the best way to do this?


MAP

The MAP sensor needs to register the inlet manifold vacuum? As the dual carb manifold essentially has 4 separate runners I presume I will need to tap 4 separate holes for each of the runners so I can then set a vacuum line up for the MAP? If this is correct I presume there is are issues having each runner connected by a vacuum line? Again do you have any images or know of any that shows how this has been done?

Again I suspect its best I do a test on the MAP first to check it is still functioning and sending a reading to the ECU? What’s the best way to do this?




With the TPS and MAP connected and the ECU receiving a signal then I presume the ECU will gain full control over the timing and I should see better performance as a result? I presume I would need to return the base timing back to what it is before doing all the above?


Forgetting about the stock ECU for a second what system would allow me to replace the stock ECU and wiring loom and still have full control over the timing with my dual carb set up?

Cheers

James