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Discussion Starter #1
Anyone care to explain to me exactly how the eprom works with the power commander? If the PC overrides the stock injection maps then how is an eprom affected? Maybe I'm way off track. Call it a mod-noob question.

With my current mod's (arrow mid and bmc filter) I know I probably could get by without either, but I want to know the relationship between the two.

Oh, and how much do eprom specs vary? Are they all about the same or is an MV Corse eprom way different from an Arrow or FBF?
 

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There's a computer chip, EPROM, that does what a PC would do. However, if you do any strange mods, like putting on velocity stacks that stick out of the top of the bike or something, the EPROM wouldn't handle that, but the PC would. So, no, you don't need both, but depending on the mods, you can get one or the other.
 

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Like CAG said, You don't need both. In my case I installed the eMoto chip. Mainly because I wanted to smooth the throttle response and possibly improve the gas mileage. It did seemed like the throttle was better afterwords and my gas mileage improved ( I was getting 23 mpg ) . Now I'm seeing 30 -33 depending on how I am riding....:) . But based on some dyno post's on this site. I think a Power commander may be in order. It might release a few more hp. If you add a PC it will bypass the chip. So if you want a PC don't both with chip.
 

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Discussion Starter #5
Well I'm not planning on doing a lot of mods. Aside from the filter and midpipe, the most I plan to do is get new cans, nothing else. I guess my question is, how accurate is an eprom matched to a mod-set? Of course the PC is more accurate, as I could have a custom map made for exactly my mods, but just how flexible is an eprom, and exactly what mods are they designed for? I wouldn't mind saving myself $200 if I don't need the PC.

Btw, thanks for the clarification.
 

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Talk to X81. He is experimenting with a programmable eprom, I think. Other than that, they are not flexible at all. You have to buy one that is flashed and plug it in.

CAG
 

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Discussion Starter #7
Sorry, I should rephrase that. By flexible, I meant how many variations of mod's can an eprom accomodate. Ex. If I did extensive engine mods: porting, altered cams, big bore kit, etc, etc... obviously a PC would be better, as it can be programmed to work with any setup (from what I understand). Question being, is an eprom's functional range of engine configurations wide enough to include anything from bone stock to a full exhaust with a filter?
 

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I'd say no. If you think about it like this, a car's ECU is able to accommodate changes in it's system because it's a closed-loop system, referring readings to itself over and over again. The EPROM tells the ECU what it's doing entirely. So, if we open up the air filter, it's getting more air than used to and it will run lean, because it doesn't know any better.

Over all, I say get the PC, 'cause the EPROM might not like the altitude you're at or anything else.
 

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You don't need both

Like CAG said, You don't need both. In my case I installed the eMoto chip. Mainly because I wanted to smooth the throttle response and possibly improve the gas mileage. It did seemed like the throttle was better afterwords and my gas mileage improved ( I was getting 23 mpg ) . Now I'm seeing 30 -33 depending on how I am riding....:) . .
Like he said....

The one thing a chip will do that a PC3 won't is adjust the ignition advance curve - that is why I went chip Moto One from Australia 2 years ago - very happy.

JIM
 
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