Bosch Mono-Jetronic

[Bill]

At 10:18 PM 1/31/96 -0600, you wrote:
>
>>At 05:09 PM 1/31/96 GMT+0200, you wrote:
>>
>>>I recently started looking at the FI system in my wife's Fiat Uno again,
>>>after it developed a flat spot on accellerating.
>>>
>>>The system consists of a single injector in the throttle body, an inlet air
>>>temp sensor, a throttle position sensor, a servo to control the throttle at
>>>idle (idle speed), a water temp sensor and a lambda sensor. And engine rpm
>>>info is sent to the system from the ignition computer.
>>
>Jim responds
>
>> What .. NO MAP sensor .. and no AIR FLOW or AIRMASS sensor???
>>
>> are you SURE???
>>
>
>It is possible to run an engine with no device at all to measure the
>airflow.  This is how the holley projection works.  It is simple.  You
>simply measure the throttle angle and rpm and reference a map.  However this
>map must be very accurate.  It is quite commonly done on engines with little
>vaccume like morotcycles and highly cammed race cars.
>
>David J. Doddek                                          |pantera at dris.com
>Owner SGD Electronics & Development Engr for Caterpillar |h 309 685-7965
>Formula SAE Team Sidewinder 94-95                        |w 309 578-2931
>89 T-bird SC,  69 Fairlane w/SGD EFI                     |fx 217 428-4686
>74 Pantera w/Electromitive Tec-II Twin turbos and Nitros |
>Hey, If you are going to go fast, go REEEAAL FAST.       |
>
>

Another thought on sensors......

Stu Hilborn made a name (and a comfortable living) for himself by designing
and marketing fuel injection systems since the '50's.  The system consisted
of a positive-displacement pump, a throttle plate for each runner, a jet for
each runner, and a "barrel valve"....a device which was mechanically linked
to the throttle plates and essentially  modulated fuel flow as a function of
throttle plate position....period.  No MAP, MAF, no density or temperature
transducers.  

If you've ever driven a high performance vehicle with one of these systems,
you've found that they're lacking on a variety of fronts (emissions,
driveability, economy), but nonetheless provide what it takes at the track.
And I presume at least some of you reading this are doing so because you're
looking for increased performance.

I'm not suggesting that this type of sensor-less system (some may call it
sense-less!) is the way to go.....but let's all remember that AFTER AN
INITIAL TUNING and under constant barometric and temperature conditions, all
that is required to calculate fuel rate is RPM and throttle plate position.  

                                                                      Bill