hey whats up guys.. its been so long anyways...

I've heard that if I buy a slip on exhaust i HAVE (must) buy a power Commander?? is this true.. or is it only true with full exhaust only

many opinions..

 

no its not necessary with just a slip on

 

so if i were to buy a full exhaust system then i would have to purchase a power commander??

 

You still would not "have to". Basiclly any mod you make that will change the air / fuel intake or output can make your bike run a bit off so to speak. So the pc3 if dyno tuned will help you get your air / fuel back to optimum performance. An air filter and slip on is not changing the characteristcs all that much, but you could still get it dialed in better with a pc3. Now the full exhaust is going to flow more then a slip on, so without the pc3 your a/f is gonna be a lil more off still. So where you draw the line on needing one is up to you really, and how much money you want to spend.

 

I just added my 2 bros slip on yesterday (07 600rr). In talking with the mechanics at honda, they said that from 07 and on a PC3 helps in the power dept. but is not a need.

Why?

Before last year, the fuel valve was not adjusted according to the read out from the ECU- starting last year the valve is controlled by the ECU thus adjusting (slightly) to the amount of air in, fuel mixture and exhaust out. Thus a slip on will not make the motors run super lean (like 06 and prior). A PC3 WILL enhance this and give you more power-

I will add mine over the summer with a BMC and some new jet settings...for now...shes great!

Good luck

 

Are we talking about a 49 state CBR1000RR? If so, then the Honda "mechanics" were talking out of their asses. There is no fuel valve of this sort on the 1000RR. The ECU runs open loop and has no ideahowrich or lean the enginemight berunning. Hardware wise,the '06 and '07 are the same. I've heard nothing to suggest the '07ECU hasany special fuel delivery functions the '06 does not. The bottom line is that if you really need to know if a PCIII will help, you've got to take AFR measurements.

 

I highly doubt they talk out their asses- close friends who are certified tech's through Honda on full motor, tranny and service standards set by Honda...

Consider it the fact that they must of just been talking about the 600's (considering thats what we were talking about at that time). It was *I* who assumed that 600 technology would carry over to the 1000.

 

I am no bike genius by any means, but (excluding cali bikes) as far as i know none of these bikes have 02 sensors. So how exactly is the ecu monitoring the a/f ratio ? ? OH and what jets are you changing on a FI bike ?

 

That's understandable, the 600 has some functions the 1000 doesn't. I'm not sure how the fuel delivery differs but I think the 600 got a knock sensor for '07 where as the 1000 did not.

 

I'm not sure who you're replying to but nobody saidanything about changing jets or the ECU monitoring the AFR.

When I made my PCIII map I used an onboard NGK Powerdex wideband system to take AFR measurements.