I've got a 3.0L engine in my 1991 and I'm interested in how the injection system works. I'm thinking that since the injection is mechanical, the injectors only open and close once in each injection period and don't pulse like some electronic ones do. If the injection pressure stays constant, I'm assuming that the shortest period would be when stopped at idle with the engine warm, and the longest period would be at max RPM under full load with the engine cold (not that I'd do that!) Does anybody know about how much fuel would be delivered by an injector in those two conditions, assuming the engine is otherwise in good condition? Also, does the pump shut off when decelerating? (It would save gas and pad lining.) If I wanted to implement pulsed injection and fuel shut off, would Megasquirt do it? What fuel rail, pump, injectors, etc. should I use? I figure I could connect the controller to a throttle position sensor and the brake light switch. When the throttle was fully closed and the brake light switch was on, the fuel would cut off. Since the brake light switch activates before the brakes do, I could cut off just the fuel or brake at the same time. I'd be worried about the engine braking being too much in rain or snow or interfering with the ABS system. Also, would pulsed injection have any advantages in the M103?

Thanks for looking!

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1977 300D (Sold)
1991 300E (Sick, but getting better)


"To Be is to Do." - I Kant
"To Do is to Be." - JP Sartre
"Do Be Do Be Do Be." - F Sinatra
"Yabba Dabba Doo!" - F Flinststone

You'll need to check with fellow member tjts1, I know he did a megasquirt conversion on 2.6.

Megasquirt 2 into 92 2.6 manual project - 190 Revolution

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

If you visit the "Performance Paddock" there are some very sharp injection guys who hang out there.

Rgds,
Chris W.
'95 E300D, 359K

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Objects in closer are mirror than they appear.

Thanks. I'll repost this over there.

__________________
1977 300D (Sold)
1991 300E (Sick, but getting better)


"To Be is to Do." - I Kant
"To Do is to Be." - JP Sartre
"Do Be Do Be Do Be." - F Sinatra
"Yabba Dabba Doo!" - F Flinststone

In CIS the injector is just a fancy mister nozzle. The fuel is metered by the fuel distributor, continuously. The system already has a deceleration fuel cut, over about 20-25 mph with the throttle closed. The electronic control of the fuel distributor handles decel fuel cut as well as enrichment. I don't have specific flow rates, but the 3.0 CIS fuel distributor can flow enough fuel for +-300 HP. Takes a lot more air than the stock engine can flow to max it out. 9lbs of boost gets pretty close though.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff