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post #1 of 27 Old 11-15-2006, 9:09 AM Thread Starter
 
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Looking for an article: FI

I'm looking for a technical article that was written a few months ago, not sure of the author, may have been Cameron...maybe not. It was a look at why the FI on bikes has evolved into two injector systems, and offered a good description of runner length vs injector position...

I cannot seem to locate it, so any help finding this article would be appreciated....

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post #2 of 27 Old 11-15-2006, 12:05 PM
 
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Re: Looking for an article: FI

Couldn't find the article but looky what popped up in my search:

United States Patent: 6843219

And then there's this asshole...
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post #3 of 27 Old 11-15-2006, 5:45 PM Thread Starter
 
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Re: Looking for an article: FI

Thanks phobe, that does help...

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post #4 of 27 Old 11-15-2006, 6:12 PM
 
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Re: Looking for an article: FI

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Originally Posted by Baketech View Post
Thanks phobe, that does help...
Bake, are you looking for any specific information?

Why two is as simple as the dynamic range of the motorcycle engine and the limits of current injector technology to deliver the precise metering.

Runner lengths and positioning depend on some other factors, that are a little more difficult to explain.
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post #5 of 27 Old 11-15-2006, 6:28 PM Thread Starter
 
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Re: Looking for an article: FI

Fiddling with a "project" right now, and trying to understand some flow numbers we are getting. The article gave a really good explanation of the effects of the injector positioning and how the actual related injector hardware affected flow.

Not surprisingly, the carb setup currently makes more power, even with the FI crap still in the airstream...

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post #6 of 27 Old 11-15-2006, 7:36 PM
 
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Re: Looking for an article: FI

Use a leafblower as a supercharger.

Problem fixed, thank me later.

It's amazing how stupid some people can be.
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post #7 of 27 Old 11-15-2006, 7:36 PM
 
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Re: Looking for an article: FI

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Originally Posted by Baketech View Post
Not surprisingly, the carb setup currently makes more power, even with the FI crap still in the airstream...
Not surprising. The real benefit of FI is that you can have it automatically adjust for temperature and altitude. Thus keeping it closer to it's optimal tune. Carbs can be very efficient, and much less complex the FI.

Are you watching the exhaust gasses to know if you are too rich?
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post #8 of 27 Old 11-15-2006, 7:55 PM Thread Starter
 
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Re: Looking for an article: FI

Full EGT...

Quote:
Originally Posted by Hammer View Post
Use a leafblower as a supercharger.
Problem fixed, thank me later.
Leafblowers are a "power adder" and not allowed in the class....

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post #9 of 27 Old 11-15-2006, 8:10 PM
 
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Re: Looking for an article: FI

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Full EGT...
Just EGT?

No full Lamda sensor setup?


You're letting me down here
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post #10 of 27 Old 11-15-2006, 8:15 PM Thread Starter
 
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Re: Looking for an article: FI

Negativo...

Open loop, just like me...

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post #11 of 27 Old 11-15-2006, 8:24 PM
 
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Re: Looking for an article: FI

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Originally Posted by Baketech View Post
Negativo...

Open loop, just like me...
One for tuning purposes makes a big difference. I know there are some out there for around $500 (lab instrument) that makes tuning so much easier.

Or go to a garage with an exhaust sniffer and play some. Tuning an FI system can be a real tricky thing depending on what you are starting from and what tools you have available. Lots of factors.

What kind of controller?
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post #12 of 27 Old 11-16-2006, 6:05 AM Thread Starter
 
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Re: Looking for an article: FI

Must run the OEM computer, with plug in chips only...

Carbs are currently the way to go right now, but I think they are going to get slapped with a weight penalty to encourage the use of FI...

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post #13 of 27 Old 11-16-2006, 10:33 AM
 
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Re: Looking for an article: FI

Quote:
Originally Posted by Baketech View Post
Must run the OEM computer, with plug in chips only...

Carbs are currently the way to go right now, but I think they are going to get slapped with a weight penalty to encourage the use of FI...

If you have an OEM computer, then why do you ohave carbs?


I'd recommend the Better Made chips; you can get replacements in better stores everywhere
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post #14 of 27 Old 11-16-2006, 10:49 AM Thread Starter
 
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Re: Looking for an article: FI

Trying to make the decision whether to go carbs or FI...

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post #15 of 27 Old 11-16-2006, 11:06 AM
 
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Re: Looking for an article: FI

I'm assuming cars ... drag (no not how you dress on the weekends ), oval, or road racing? I'm assuming drag, because that's the kind of guy you are And what brand?

If so, then it gets easier to make HP because you have limited conditions. Let me know more (PM if you want) and I might be able to help some or get you in touch with someone who can.
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