34 replies to this topic

[Ethel]

There should be no difference between an economy and power map as both are about getting the most energy out of burning a quantity of petrol. The extra map is intended for running different grades of fuel, or nitrous, that will give different burn characteristics. You could also use the extra map for a warm up setting to do similar to V4 auxiliary input or you could use on of the MJ's own programmable outputs to switch it and effectively double the size of the map, quite handy with a turbo as you could switch maps when the boost kicks in.

As I said before one of the neatest uses would be to compare advance settings for tuning purposes - you can't really drive and tinker with a laptop at the same time but you could flick a switch and see what difference a degree or two change in advance makes: while logging it all on your laptop to analyse later.

[mike.]

Well i only got the economy map idea from threads on here anyway.

A warm up map sounds good though...

So once i've uploaded a map. What needs to be done after that? If i want to use the aldon yellow map, do i just upload it and away i go or will it take adjustng?

[Ethel]

You just load and save the map into the MJ, but you can still tinker with it and save any adjustments. The only other issue is the crank sensor telling you TDC is in the right place - you'd need a strobe to check that if the MJ says you have 10degs of advance the timing marks agree. In reality it's doesn't matter if TDC is where you think it is (if the advance is optimum, your engine won't know or care what numbers are on your pc screen - it'll just work better), but having some datum is useful and it could be less confusing if it was actually right

[mike.]

So how do i make sure thats right? Just make sure i've got the trigger wheel on the pulley exactly where it needs to be?

I'll be using the specialist components trigger wheel kit if it makes any difference.

[Ethel]

Just the same as a dizzy, shine a timing strobe at the pulley and alter the spark timing (as stated by the MJ) until it matches the marks on the pulley. You have the option of physically moving the sensor (or wheel) or, if you update your MJ to the latest software, you can use the trigger offset feature to adjust it by a few degrees.