I'm close to buying this exhaust, BUT

[CIP57_imp]

To the OP, I think you'll find that opinions are somewhat divided on whether modifications to the ECU (reflash or Power Commander) are necessary to accommodate a full exhaust system.

I've seen a member post a dyno run from an unmodified ECU bike running a full exhaust with A/F ratios near bang-on 13:1, and others will attest that their bikes run fine without additional mods. However, I think we can agree that an ECU reflash (the only method that allows timing advances) would allow you to maximize your new exhaust system.

Best of luck with your decision!


Sent from my iPhone using Tapatalk

I read that thread with great interest (I'd be more than happy to be able to just slap on an aftermarket exhaust and not worry about changing or adjusting anything regarding the A/F ratios) and went back just now to see if I could find it. If I'm right, you're referring to CIP57's charts and the discussion the two of you had. If so, he wrote:

"Here is what you can expect with a flash and a stock PC5 map installed into your ECU running a full Yoshi. The A/F ratio is almost spot on, running a bit rich on top. The bike runs much cooler with the added fuel."

I read that to mean the numbers he put up were showing the ratios after a reflash and download of a PC-V map while running a full Yoshi. Where it gets confusing is that he writes "stock PC5 map" but then also rights that the "bike runs much cooler with the added fuel." It's unclear what he means by a stock PC5 map - I take that to mean it's one of the pre-programmed maps already available on the PC-V for a Honda CB1100 running a full Yoshi exhaust (which means it is changing the A/F ratio) and not a custom map he or Don developed on their own. This is consistent with his next statement about the effect the "added fuel" has on the temp.

CIP57, if you're reading this, maybe you can clarify.

I read that thread with great interest (I'd be more than happy to be able to just slap on an aftermarket exhaust and not worry about changing or adjusting anything regarding the A/F ratios) and went back just now to see if I could find it. If I'm right, you're referring to CIP57's charts and the discussion the two of you had. If so, he wrote:

"Here is what you can expect with a flash and a stock PC5 map installed into your ECU running a full Yoshi. The A/F ratio is almost spot on, running a bit rich on top. The bike runs much cooler with the added fuel."

I read that to mean the numbers he put up were showing the ratios after a reflash and download of a PC-V map while running a full Yoshi. Where it gets confusing is that he writes "stock PC5 map" but then also rights that the "bike runs much cooler with the added fuel." It's unclear what he means by a stock PC5 map - I take that to mean it's one of the pre-programmed maps already available on the PC-V for a Honda CB1100 running a full Yoshi exhaust (which means it is changing the A/F ratio) and not a custom map he or Don developed on their own. This is consistent with his next statement about the effect the "added fuel" has on the temp.

CIP57, if you're reading this, maybe you can clarify.
Just back from vacation in NC and catching up on threads.

Your correct, the stock PC5 map which adds fuel as noted in the graph Hiker has posted in combination with the full Yoshi will give you a spot on A/F ratio. There is not much more to gain by a personal tune. I have sent my map with A/F to a local tuner in Danbury Ct, he felt it would be a waste of time and money for a personal tune.