Not much of an update right now, but the inlet manifold and an ABF throttlebody left bound for Futbus yesterday morning. This is in preparation for a second attack on the Megasquirt front, after the first abortive attempt.
The first attempt failed because we were trying to ensure the car could be swapped back to the old management system. This time it's sh*t or bust.
The ABF body is larger than the OEM ABA body. The one which is on there at the moment is (I think) a 2E body, which has the same bolt spacings as the ABA. I jerry-rigged this because where the car has been running Digifant II it needed closed throttle and wide-open throttle switches, not a throttle position sensor.
So, by switching to the ABF body we should see more air through the body and we get a TPS, which is what we want for Megasquirt. We also delete the swinging-door MAF sensor, which is on the airbox. This should all add up to more air through the system, so more power.
Of course, to actually liberate this extra power we need proper management - I have the Megasquirt built up and ready and a wide-band lambda box and sensor on the shelf, awaiting fitment.
As all this involves dragons and other mythical (and electrically powered) monsters I need a tamer of such black magic, so all of this should come together when the good Doctor P visits in a weekend or two's time.
MS should make the car a lot better to drive. The map we've got on it is supposed to be for a heavily breathed on 8v, but the crossflow head (which has been worked on, remember) seems to flow not only more air, but flow it very differently to the counterflow.
As I think mentioned before I've been swapping fuel pressure regs, depending on whether I've been on road, or on track. With a 3 bar reg it leans out over 5k, with the 4 bar reg it has a lumpier (rich) idle, pulls well, but it goes flat at about 4.5k (we think it's running too rich at that point) and then picks up again just under 5k and throws itself violently at past the red line.
Once this is done I need to see whether the Inland Revenue return enough of last year's tax at the end of March to facilitate cage fitting before April 19th. If that doesn't happen there won't be any rush as times is tight and the call of the (cheap as chips) off road trialing circuit is loud again.