MLV question

[cossack84]

What parameter you guys look at in MLV to know when injector is wide open?
I get that the fuel table is in 8 bit ADC and that the EcmSpy tuning guide mentions "each value in the table equates to 58 microseconds of injector pulse width duration". But what value is it refers to?
Also can some one please post or email me a copy of stock, unmolested 2004 (BUEGB) map. I need to use it for reference.
Any help would be greatly appreciated.

 

[Silverrider]

Is it in here ?

http://buellmods.com/

 

[cossack84]

It is but its a .txt document. I'm fairly ignorant when i comes to converting those. Would be great if it was in .BIN or .XPR.

 

[ReadyXB]

What parameter you guys look at in MLV to know when injector is wide open?
I get that the fuel table is in 8 bit ADC and that the EcmSpy tuning guide mentions "each value in the table equates to 58 microseconds of injector pulse width duration". But what value is it refers to?

You want pw1 and pw2, which will correlate with Load.

 

[cossack84]

You want pw1 and pw2, which will correlate with Load.

Yep got those up. DO those numbers stand for 58 microseconds? 1 pw = 58 microseconds?
In the picture below where I have my cursor set, PW1 = 3.701 and PW2 = 3.431. You would multiply those by 58 microseconds to get time? If yes then at what point does PW = wide open injector?

 

[ReadyXB]

Yep got those up. DO those numbers stand for 58 microseconds? 1 pw = 58 microseconds?
...

Are you just curious about how the units are derived, or are you doing something important with them?

 

[cossack84]

Both, because if I ever decide to run E85 I would have to know when injectors are maxed out.

 

[Cooter]

I believe 255 is the max the fuel map runs at? Just a guess thats WFO for an injector, but it's just a guess.

But FYI, if you're going to run E85 for some reason, you will need new injectors to keep the dwell reasonable. Know that they are different front and rear.

 

[cossack84]

Cooter thats right, 255 is a max value in 8 bit ADC format that you can enter into the fuel map. How ever that does not tell me how long the injector is staying open or whats more important the percentage of its maximum output.
What is dwell if you dont mind explaining please.

Edit: how do you know for a fact that I will need new injectors. What specific data point tells you injectors are at max capacity? Sounds like you might know the answer to my question.

 

[ReadyXB]

Both, because if I ever decide to run E85 I would have to know when injectors are maxed out.

What will be your tuning strategy?

 

[34nineteen]

What is dwell if you dont mind explaining please.

Cooter is soooo old, he remembers 'dwell'.

Dwell (at least in points in ignition systems) was the time between when the coil has time to build up a charge (points open) to when the points close "collapsing" the spark. I would guess Cooter means "duty cycle"... or the time between when the injector opens and "recharges" to open again. Duty cycle may not even be the correct term.


Hopefully he will chime in as soon as he finds his readers and gets back from the AARP meeting. :love_heart::black_eyed:

 

[cossack84]

What will be your tuning strategy?

I don't have an answer for you.
Do you know what data point represents injector at max flow?

 

[cossack84]

Cooter is soooo old, he remembers 'dwell'.

Dwell (at least in points in ignition systems) was the time between when the coil has time to build up a charge (points open) to when the points close "collapsing" the spark. I would guess Cooter means "duty cycle"... or the time between when the injector opens and "recharges" to open again. Duty cycle may not even be the correct term.


Hopefully he will chime in as soon as he finds his readers and gets back from the AARP meeting. :love_heart::black_eyed:

Hey that makes perfect sense. I appreciate the explanation.

 

[Silverrider]

I always use mine on Cheve tune ups, back in the day.

 

[njloco]

Works fine on my bike!

Old people rule !

 

[Cooter]

Dude:

Those old dawgs are right^^^^:eagerness:, Dwell is exactly the same meaning regarding points and injectors. Time open.
"Duty Cycle" is used to describe the same thing but as {time open vs. time closed}. Usually used as "maximum duty cycle" which would be the recommended maximum open time. 100% Maximum duty cycle would be ok to leave energized (open) 100% of the time. Injectors don't like that, heat up, and don't meter well at high dwell/ high duty cycle.

Simple math:
Gasoline is stoic at 14.7:1
E85 is 10:1
http://injector-rehab.com/shop/e85_injector_size.html

So either...
Multiply your injector duty cycle by 1.47 and see if it's within it's happy range (it's not*)
Or if you could multiply the stock injector size by 1.47 and you could (in theory) use the same map.

*255 represents the maximum on a Buell fuel map. Either 100% open OR the max duty cycle they want to run doesn't matter. It's the max input you can put. Look at the map and see how much of it is already maxed out. There is no room to just add almost 150% of the E85 needed to run well.

Heres a question... Why E85? It has less power (BSFC, BTU's whatever you like). Sure it has high octane but who cares? Unless you run super high compression, super advanced timing, or forced induction, you'll se no benefit from it besides buying a whole lot more of it. If you are building a forced induction, high compression, Buell motor, um... buy the damn injectors! I wanna see it!:angel:

 

[gunter]

Cooter thats right, 255 is a max value in 8 bit ADC format that you can enter into the fuel map. How ever that does not tell me how long the injector is staying open or whats more important the percentage of its maximum output.
What is dwell if you dont mind explaining please.

Edit: how do you know for a fact that I will need new injectors. What specific data point tells you injectors are at max capacity? Sounds like you might know the answer to my question.

http://ecmspy.com/cgi-bin/detail_ld.cgi?ecm=DDFI2&offset=21
http://www.megamanual.com/v22manual/minj.htm#size
http://www.megamanual.com/flexfuel.htm

 

[njloco]

That's so funny ! Cooter the timing light is in the little compartment in back of the analyzer.

 

[34nineteen]

That's so funny ! Cooter the timing light is in the little compartment in back of the analyzer.

Montgomery Wards... are they even around anymore?


I'm with Cooter. Why E85? Did 100+ octane go the way of.... Montgomery Wards? Not knocking you, just asking the question.

I'm curious to see the end result as well.

 

[cossack84]

http://ecmspy.com/cgi-bin/detail_ld.cgi?ecm=DDFI2&offset=21
http://www.megamanual.com/v22manual/minj.htm#size
http://www.megamanual.com/flexfuel.htm

Great info, thank you for the links. I must me extremely dense because I can't make sense of the first table you linked. If you could, please explain what pw1 and pw2 actually represent or stand for.