Boosterplug

[17-CB-002]

Alain i wonder if you can help me out on this one;
"that 100% of incoming air is measured by the MAP sensor"etc.

I have always thought that the volume of air was measured by a Mass Air Flow sensor using two very small resistors placed strategically in the airflow before the air filter measuring the volt drop ( temperature difference ) between them and translating that into an output signal to the e.c.m.

Do you mean that the same air volume can be measured by the Manifold Air Pressure sensor measuring vacuum on the intake manifold?
I'm a bit unclear on that one and never worked out the role of the map sensor.

Hi MAx, There are many methods of measuring incoming air; MAF, MAP, Hall effect etc. Yes, your concept of MAF is correct, using a hot wire and watching the voltage required to maintain the hot wire at set temperature - This design is very expensive.
The MAP used on our CB1100 is less accurate and less expensive but does the job, it has a diaphragm that flexes to the amount of intake manifold pressure (Negative pressure is vacuum)
- Example, at idle because of the throttle plate the intake manifold vacuum is high (let's say 18 inch of Hg) and at wide open throttle the vacuum is low (let's say 2 to 0 inch of Hg).
The ECM just compare this MAP reading to a built-in 3-D mapping and calculate the fuel required accordingly in relation to engine RPM.

The "Hall effect" sensor works on the principle of turbulance created by incoming air A built in mirror vibrates accordingly and sends the frequency to the ECM as the amount of incoming air.
Alain

If I remember correctly- my old ZRX1200 picked up ..... *edit- just went back and looked- 16.6whp from pipe and jets.


Alain- you are giving the factory injection too much credit. It is NOT smart enough to 'calculate the correct/proper amount of fuel required - no less/no more.' It will not adjust for 100% of the air for any modifications done to the bike.

It is simply built to run correctly on a stock bike and hit an emissions target. It does NOT have a wideband O2 sensor from the factory. Just a plain old simple narrow band.

While it isn't as crude as old CIS or Digifant injection- it is still basic in it's operation to meet it's goal. Once the intake/exhaust is changed outside of it's initial design parameter, the fueling is no longer correct.
To the guy that mentioned the Z900 above, check this out- http://www.ivansperformanceproducts.com/z900rs.htm

Hi PowerDubs, as stated earlier - modification beyond the OEM specification is beyond my pay grade. It's just like Religion and Politics I never dare to venture into those arguments. The Engine computer used on our CB1100 is a very basic one, not too many logic built in there when compared to today's automobile, however, it meets EURO-3 or 4 I forgot which one.
BTW, did you know that it was DENSO who invented the Air Fuel Ratio (AFR) sensor (some people call it Wide Band sensor).
Let me explain the difference between an oxygen sensor and an AFR sensor:
The oxygen sensor invented by BOSCH/VOLVO works on the principle of Oxygen contents (present or not) inside the exhaust stream, Note: It does not detect Hydrocarbon (Hc).
So when the ECM sees a lean condition (0.1v from the Ox sensor) it add fuel to the base fuel calculation and monitors the Ox again to confirm for a Rich condition - when it sees the rich (0.9v) condition, it reduce fuel and monitors the Ox again expecting it to be lean. This cycle keeps repeating all the time like an ON/OFF switch. Conclusion, the Ox sensor cannot exactly tell how Rich or Lean the combustion is.

The AFR sensor however, can tell precisely how Rich or Lean the exhaust gas is, from a Lean (0.1v) condition to a Rich condition (4.9v) and anywhere in between. So the ECM can instantly make contineous minor correction to the fuel amount. Most OEM uses AFR sensor in front of the Catalytic convertor (because it is fast and precise) and uses the less expensive Ox sensor after the cat.

Note: above explanation is a readers digest version, it takes a full day to properly explain both sensors.
Alain

[PowerDubs_imp]

Thanks for your wiki copy paste.

What does your response have to do with you saying the CB’s system will read and adjust for 100% of airflow when that isn’t true?


For reference, I was putting wb02 onto cars 20+ years ago.





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[tsmetjen_imp]

Found it




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[tsmetjen_imp]

Does some have a recommondation on a good app on IOS to monitor accelaration (from 0 to .... and rollon ...). I would like to compare with or without boosterplug to prove I feel difference


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[PowerDubs_imp]

Waaay too many variables for that to be viably tested on an open road.

Best would be a dyno, next best would be many runs done at the drag strip and compare average trap speeds.

Both are controlled environments with precision measuring equipment.

[tsmetjen_imp]

Waaay too many variables for that to be viably tested on an open road.

Best would be a dyno, next best would be many runs done at the drag strip and compare average trap speeds.

Both are controlled environments with precision measuring equipment.

In Belgium we don’t have drag strips , at least not that I know of

And a phone with a good tracking gps should give accurate info , no? With a good analyzing tool these figures could give a very good impression.

But maybe I’m just a dreamer


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[Klais_imp]

By the way, who knows whether to put Power Commander Dynojet on Harley or it will not suit him?

[Cormanus]

Welcome, Klais.

[PowerDubs_imp]

By the way, who knows whether to put Power Commander Dynojet on Harley or it will not suit him?

Will work just fine on a Harley. They have special models in fact just for Harley.


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[GoldOxide_imp]

By the way, who knows whether to put Power Commander Dynojet on Harley or it will not suit him?

Klais?






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