The fuel cut was used on production vehicles . It works by stopping the fuel pump. The pressure will be maintained for a
few 1/10 of a sec, then it will drop and rpm will start dropping, rapidly, due to fuel starvation, ie lean burn
Pump will kick in , engine starts revup ..... and so it goes.
This was signal to the driver to shift up. It was used on manual as well as auto gbox cars.
Most drivers would lift off and shift up. It was good enough for MB, they probably made quite extensive tests
what happened if you just stayed in gear and stomped. My next life will be as production test driver, as is now I have
to pay for all of my excesses
I had a 300E ( W124) and tested it a few times . This was an autobox jalopy, and it did not shudder, jerk or bang,
it just levelled out at 6350 rpm as long ( 1-2 s?) as I stepped on it.
One advantage is that the horrible mech transients that comes from a hard spark cut are avoided. Also the exhaust bangs,
which certainly is a prime concern on catalyst cars. The cat structure collapses at a cat explosion if it is the ceramic haney-
comb stuff.
The soft spark cut you describe is interesting, but you have to control dwell as well, reducing the current is only a partial solution.
And dwell is an internal function in EDIS, not accessible afaIk.
Stored energy in the coil = 0,5*the coil current squared*charging time Ws.
But testing the current limiter seems a good solution. A simple test would be to supply the whole EDIS with a variable power supply at
6-12 VDC good for 3-5 Amps , and see how it reacts at say 6100 rpm when you reduce the drive voltage.
Good luck and please let us know how it goes. Very interesting.
I am presently helping a friend with a very hot Ford 351W, MS2 Extra 2.1.0 and EDIS. And we have decided to rely on the inherent EDIS 8
rpm limiter which is around 6700 rpm, but your idea seems interesting. The 350W is extremely well balanced and in top condition mechanically,
but a rev limit at 6100 would be MUCH better. It sits in a GT40 replica , very light and up to 3rd gear the rpm shoots off of the scale very fast!
We also managed to pulverize the Renault 5 speed box
. So now the car is down for mods, a competition modded AUDI box is on its way in .
Good for 1500kg and 750 hp. Should be enough
Best regards
W113