Fuel Injection on a budget.

[elansprint]

John there must be a base map in the ecu & then the lambda will alter air fuel ratio to target map i guess the mondeo's are narrow band lambda & have a limited fine tune ability they would have more scope with a wideband lambda.If they had that range of adjustment they would be self mapping & surely that is not the case it would be nice if they were but i stand to be corrected. My Tuscan use MBE ecu & this has adaptive tuning but will not self map would make the job real easy at ?25 for a mondeo ecu if it was
Ian

[gerrym]

John et al, the Mondeo ECU (Ford EDIS) control algorithms are based on a closed loop / open loop architecture. The key measured parameter is engine total airflow (not per cylinder) and a lot of effort is expended into making this airflow measurement independent of cyclinder pulsations. Note the tuned honeycomb flow straighteners and plenum geomentry. Fuel /Air ratio is then based on this measurement, after taking account of load demand, temperature etc. Fuel /air ratio requirements also work in conjunction with timing and this is not fixed due to varying knock resistance (eg RON) but must have a knock sensor as part of the control loops. Otherwise excessive lean-out for cruise economy, combined with low fuel knock resistance and tolerances on the other measured inputs would lead to detonation. The Lambda sensor is there to fine tune the control loop depending on the operating requirements (cold warm-up, economy cruise, acceleration, anti-stumble etc).

For our retro-fits, the load (throttle position) versus revs mapping strategy is much more suitable and used by almost all of the after-market ECUs.

Regards

[pauljones]

Gerry,

Does that mean it IS possible to use the mondeo or even escort ECU as an ECU for a twink,as they come straight off the cars? With all the relevent donar parts with it?

My question is based on the bhp of a 2ltr being cira 130 and close to that of a good big valve.The escort option comes from an engine i have in the garage being an early(silver top) 1600/90bhp.complete with all electrics.i was intending to use this but now keeping the twink.


Paul

[gerrym]

Paul, if you manage to relocate all the sensors (including 36-1 timing wheel and knock sensor), you just might get it to work. But consider, every engine type has different ignition advance characteristics (depends on combustion shape, valve timing etc etc) so even if you get the ECU to talk to the various sensors and run, not in limp mode, how will you modify the programme. In old talk, tune the engine. Another way might be to use a Megasquirt in conjunction with the EDIS module. This will give you the tunability. All depends on your skills and time.

Regards

Gerry

[jeff jackson]

Hi all,
Thanks for all the input to my post, I have been following with interest.
One more question if I may, if I were to get motorcycle throttle bodies from flea bay for example, what ones fit?
Honda CBR600 were mentioned in the thread, or can I get any at a reasonable price and make an adapter?
On a final point, this is more of a challenge than going out and getting an "off the shelf" solution.
I'm nuts - I know that. ( Probably why I own a Lotus).
Kind regards
Jeff 72+2
PUP.

[Kiwi elan +2]

It may seem like an obvious thing but I had a running rich problem with my webers till I set the timing while it was running at 2500rpm to 3000rpm. Prior to this I used to set the timing at slower revs and then decided that if I want the throttle response at 2500rpm then that is where I needed the timing to be most correct. Turns out that the distributor was a long way away from where I had been setting it prior and the rich issue I had was corrected. At 2000 and 3000 in my book it lists 27ish and 30ish degrees respectively which is also an easy area to set. Just a bit noisy while you set it.

[pauljones]

Found this advert, www.chestersportscars.co.uk tell 01244 545161 basicaly looks like what your after.engine tuning kits for several types of fords. manifolds bike carbs and programable ignition. ?750

if anything, perhaps you can ask thier advice.

Paul

[paddy]

Just popped up on Ebay (UK):

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0397753022

Paddy

[tdafforn]

hi All,
the CBR600 TBs fit OK.. They are paired, like a DCOE so will not be optimal.
getting the ignition timing correct in the mid range is definately important..
The megasquirt system on mine means I can be absolutely certain that the timing is accurate in this region..
Result: no flat spots
Cheers
Tim

[pauljones]

just a quick question for those who may know,

is there an optimum size bore for a twink,im running 40mm jenvey's,some are using 45mm.im not exactly sure but when i looked at bike TB's they were around 36mm.

im just curious...

[elansprint]

Paul 40mm is fine for a std. twink
Ian

[pauljones]

Thanks Ian,

Paul