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Aftermarket ECU Terms! 

 

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 Post subject: Aftermarket ECU Terms!
Posted: Wed Mar 15, 2006 12:00 am 
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Ok, I have noticed that no one has done a sticky or a tutorial on this subject. I am just curious as to what some of the terms commonly used with aftermarket ECU's mean and what function they serve?
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Posted: Wed Mar 15, 2006 6:41 pm 
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What terms are you referring to exactly?

list some and people should be able to clarify them for you
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Posted: Wed Mar 15, 2006 9:23 pm 
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Things like injector pulse, Narrowband, Wideband, Dwell..... Basic Tunig terms and what they do within the ECU and Engine
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Posted: Thu Mar 16, 2006 6:05 pm 
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Narrowband and wideband refer to HEGO/Oxy sensors (HEGO is Heated Exhaust Gas/Oxygen sensor) which detect the air/fuel ratio of the car. This allows the ECU (in many cases) to adjust fuel to help maintain stoichromatic (sp?) AFR (Air fuel ratio) which is something like 14:1 (air:fuel) (just a guess there).

Narrowband just gives a voltage output and isn't real accurate, although when you compare the readout with a dyno you can work out the correct voltage for stoich AFR...

Wideband gives the AFR which allows much better on-road tuning as you get a more exact readout...

Feel free to correct me if i'm wrong...
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Posted: Thu Mar 16, 2006 6:46 pm 
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Narrowband works from 0-1V theoretically. <0.5V is lean and >0.5V is right.. 0.5 been stoich. The problem is, if you are trying to tune to 10:1 when you need to keep you engine safe (or flooded), you won't be able to tell, because it will only tell you less then or more than stoich (14.7).

Wideband oxygen sensors work from 0-5V, each different voltage represents a different AFR... They are expensive, and need a controller (the expensive bit).


And injector pulse is how long an injector is open for... the Duty cycle is how many times they are opening and closing a second...

There are lots of terms, and less people to type them all up.

So, if people post up terms they don't undestand, Im sure that would be easier.

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Posted: Thu Mar 16, 2006 9:35 pm 
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Ok, well thats an awesome start. I am putting in an Interceptor tommorow! Luckily that has preset maps within the software but If I get stuck, I will be on here straight away!

Thanks Guys!
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Posted: Thu Mar 16, 2006 9:37 pm 
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careful with the default map, I dunno what it is, but just make sure its all safe (VE tables and Ignition advance) if it controls it.

Come to think of it, Intercepter just mocks up the sensors? doesn't actually replace the ECU.. you'll be alright...


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Posted: Thu Mar 16, 2006 9:39 pm 
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Thats right! Simple ol Piggy Back! Gotta Love It! The defult maps just bypass the interceptor. Its main pourpose will be for when I get the turbo!
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Posted: Thu Mar 16, 2006 10:04 pm 
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Questions while we are on the topic.

VE tables? What are they?

and in the MSII threads, I see PIP mentioned when dealing with TFI setups, whats that?

 

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Posted: Thu Mar 16, 2006 10:08 pm 
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Volumetric Efficiency.... Its, well Volumetric Efficiency.. Contributes to the REQ_FUEL veriable, to work out the right amount of fuel to inject.

PIP is your pulse on the TFI module..

So its a Square Wave 12V... everytime the ditributor goes past #1 for example, the hall sensor picks up the ditributor vein or whatever the call it, and produces 12V.. (actually it closes the circuit inside the hall effect sensor).

So basically, think of it as everytime #1 goes past, 12V gets generated, this tells the MSII when to inject petrol, where the engine is, and how fast its rotating, and so forth...

You got the MSII running yet?
Need help?

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Posted: Thu Mar 16, 2006 10:11 pm 
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Is the Falcon Hall Sensor compatible with most Aftermarket ECU's?
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Posted: Thu Mar 16, 2006 10:15 pm 
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yes, the hall effect sensor is your typical and everyday sensor.. nothing special.. its just a square wave, nothing complicated lol.


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Posted: Thu Mar 16, 2006 10:24 pm 
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Good To Know. I have heard ppl in the past saying that there Hall Effect sensors werent compatible with there new ECU. Probably there dodgey wiring or somthing! :P
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Posted: Thu Mar 16, 2006 10:26 pm 
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hmm, there are only 12V and 5V hall effect sensors... perhaps the way they were triggering, but either way, you can make any of them work.. and the ford ones are the most common.



Cheers

 

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Posted: Sun Mar 19, 2006 7:42 pm 
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justfordima wrote:
And injector pulse is how long an injector is open for... the Duty cycle is how many times they are opening and closing a second...

well, close, injector pulse width is the time in milliseconds the injector is open, pulse frequency is the times open/close per second, and duty cycle is the relationship between time on and available on time, eg 50% is off for same time as on and 80% is on 80% of time and off for 20%

 

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