1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Sorry for typo, it was 9390220, not 9093220. EPC doesn't provide any tips on this part whether it should be for turbo or not and I'm not good enough at EZK system, sorry. 90/10 that it's for dizzy version (i.e. turbo, not EZK) although I think it should work for both setups.
LUCAS CU14 is a Lucas/Hitachi version of 2.4.2 LH Jetronic. It was installed on EU cars only (mostly british landrovers, tvr's and such - Saab was the only non-brit car with this system in stock). The main differences are:
- hot-wire type AMM that has a bypass hole with the very sensor installed so there's much less air that goes thru the sensor thus the sensor itself goes for much more. They even didn't implement burn-off function cause they believed that it wasn't necessary 'cause of decreased air flow and dirt that sticks to the hot-wire
- stock 3 bar fuel pressure regulator
- low-resistance (better say low-impedance) injectors with bigger flow. Due to the low-resistance there's an extra resistor in the circuit and the 'click' goes with two stages: there's a short pulse (direct from ECU) that opens injectors and long (better say main, duration is taken from the fuel map of the ECU) that goes thru that series-connected resistor
- titania (NOT ZITCONIA) oxygen sensor. Sensors of this type change their resistance according to the amount of oxygen that flows by while much more common (and, darn, cheaper: $350 vs $50, mama mia, holy cacao!) zirconia sensors GENERATE voltage according to the difference of oxygen inside the exhaust manifold and outside the sensor. The main (and probably, the only) advantage of titania sensors is that they don't need the reference oxygen from the outside air thus you can have you truck sunk in dirt up to the roof having the engine still running and producing EURO2 (or whatsoever) emissions
- I don't know the way it's implemented in Bosch but Lucas adjusts its maps and coefficients only when idling although it affects the whole range of load and RPM (if all the parts of fuel system are ok). This means that it doesn't look at oxygen sensor once you step on the gas and if e.g. the fuel pump is worn and there's not enough fuel at high load and/or high RPM then ECU will not notice that. Neigher it produces Tq aka Engine Load Signal that is a must for EZK brains or DI/APC ECU - all Lucas CU14 and CUX14 (brit-rovers) were designed to work with dizzy not any sort of computer-managed ignition system
- Bosch control module (ECU = brains = computer) is based on Intel chips while Lucas/Hitachi went with Motorola
- in addition to AC input it has windshield-heater input! This feature is land-rover specific although it's implemented in all versions - if your windscreen has a built-in heater then ECU is able to adjust (encrease) idle rpm once you turn it on. Also it's able to work with fuel temperature sensor but it's used for hot starts only.
Sorry for long story,
Zig
P.S.
Pe-re-stroy-ka! lol
P.P.S.
After the 1st series of bushisms were published J Bush (the first one) said that there was some sort of mistake and they with J Bush jr. are just namesakes.
posted by 91.77.158...
, Sat, 23 May 2009 21:37:20
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