Dunno about the Alfa ITB setup, but the ecu on my Manta V6 engine (with plenum) just uses ignition for idle control, so no vacuum lines and no idle valve.
Makes it a little lumpy with some rise-and-fall in the revs, but seems to work well enough in that case.
The Emerald ECU I had on a Lotus (4 cyl k series rover eng) did the same. Lovely angry lumpy idle, helped by the aggressive cams.
No worries guys, glad your enjoying the vids, i've got another one done, just got to edit it down. Yep, different safety beer indeed!, Always been partial to the old VB, I am from Victoria!
yea 6 ITB, OMG what a pain, i can set up a pair of twin Webers with my eyes closed on a hangover, but 2 banks of 3 throttles nearly sent me off the deep end.....
Re the use of ignition modulation to control the idle, yep definitely an option, I mucked around with it for a while but it's a bit limiting on how much range you can get and I found the V6 wanted a pretty high idle when it first started, my aim was to be able to start the car without touching the throttle and with the ignition alone i just couldn't get this to happen, particular when it was dead cold
cheers guys
New Video!
I broke the Shifter Housing I used (original alfa part) at a track day @ Phillip Island, so I made a new one
out of Aluminimum...
https://youtu.be/k5GeCBSusE8
Brilliant - a lovely bit of neat engineering !
That's neat, looks and sounds much more purposeful than the old plastic moulding.
The spring for self-centering seems a great idea too.
Mine has a different linkage (rods, not cable) and there isn't much throw from left to right between 1-2/3-4/5-6 planes, so that spring must help a lot.
Fascinating to watch - great ingenuity!!
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