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For the information of people who might try and follow this thread I will partily awnser my own question. There are a set of allan keys and two normal screws on the top of the fuel distributor changing these alters the nature of the fueling, but I can't find any infomation about how so I didn't touch them. There is a long mettal tube extending between the rubber intake boot and the fuel distibutor, at the bottom of this is a allen screw that adjusts the base fuel mixture (at idle). This can't be done while the car is running and you need a long allen key for it! Aparently you push down on a chuck to engadge a mechanisim below. Mine was ideling fine so I didn't play with it. This adjustment is aparently very sensative, so remember how far you turned it!
The device known as the warm up regulator is not just a warm up regulator. It enriches fuel on warm-up, but in turbo cars it also enrichens the fuel mixture under boost. There should be a vacume line running from this unit to some point on the intake manafiold (it should be beyond the throttle), I say should because on both the cars I looked at, the line had become brittle from lying next to the oil supply line for the turbo and broken, if your has fix it. The nipple for the vacume line lies under the axillary air valve so it's hard to see and check. At the base of the warm up regulator there is a rubber stopper about 10mm across. This is a tamper proof cover, pull out your screwdriver and flick it off. A very small alan key will slide down the middle of the hole and you can then adjust the amout the unit enriches the fuel in reponse to boost. Turning counter-clock wise makes the mix richer. I turned mine one full turn (it's not suposed to be very sensitive) and tested it, it made a noticable difference. I turned it another turn and I couldn't tell if there was a difference or not this time, so I left it there. To do this properly you need some type of fuel mixture sensor and before you all start wrighting letters no mine hasn't got one! The head and set up is from an australian 82 900t, at this stage we had no unleaded fuel so saab's didn't have lambada sensors untill it's introduction in 1986. I plan to fit an aftermarket sensor to help adjust the mix properly, but in the mean time it helped. The litriture on the net suggests that the fuel distributor should be good for about 200 bhp. Otherwise you can look at a fuel distributor with a different shaped cone (the aluminium cone's shape is the primary factor for how much fuel the unit delivers). One from a volvo v6 or similar should do the trick, although 200 bhp is all your gear box will handle. I suspect that adjusting the idle fuel mix will boost fuel at all levels, I won't try this without a gaudge to guide me though. I plan to give mine a intercooler and water injection in the near future to combat the tendancy to knock, the intake manifold gets very hot very quick. Hope this helps, Ben.
posted by 203.16.227...
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