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Chip question

4241 Views 20 Replies 7 Participants Last post by  tahoest2, 
tahoest2
The 1998 ST2 that I have came with a UltiMap UM 161 installed. I have the original Chip that is marked St2 USA 067U. Someone recently told me that my bike would run much better with the original chip installed.

I know next to nothing about the subject so I thought I'd ask here.

I guess 'running better' leaves a lot of questions. I'm not looking for better gas mileage, just the best running bike I can have. I live at 6,000 feet and my bike runs like crap up here compared to sea level. Not only is the 3,900 rpm stumble terrible at altitude but just overall it's unreal how nice the bike is at sea level.

Anyway, someone mentioned that my bike runs to lean and that I should swap back the original chip.

I should also note that I have gianelli pipes.


thanks.
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va duc

· The days are getting longer!
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#6 ·
The FIM chip is about the best chip out there to put in your ST , from what I have heard. I have no experience with other chips. You can have the stock chip flashed at a dealer to try to correct your problem. I purchased the 161 for my 98 ST and like the performance.There is a sensor that feeds air temp and barometric pressure to the ecu, I wonder if changing that would help?
 
va duc

· The days are getting longer!
Joined
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8,231 Posts
#17 ·
I am still curious about the barometric sensor and whether that is functionally sound. That is what feeds the input to the cpu for as far as altitude and how to compensate the fuel mixture. I suppose only a mathis tester would be able to determine that. Maybe someone could enlighten me. (no flames needed)
:D
 
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