Dynojet PCV 2 position map swtch: Useful or Sales Gimmick?

[ManaloEA]

If your exhaust has removable baffles, you can have a map for each setup.

Interesting idea, hadn't thought of that. Not sure if removable db killers do much to change the backpressure, but need to do some research. I have noticed more popping on deceleration without them.

[ducpainter]

Interesting idea, hadn't thought of that. Not sure if removable db killers do much to change the backpressure, but need to do some research. I have noticed more popping on deceleration without them.

db killers do make the bike richer.

Track bikes that are required to meet sound level tests at some tracks and add killers run richer.

[ManaloEA]

IMO, the only thing the 'switching between 2 maps' feature is good for is evaluating map changes while riding.

I've not heard a convincing argument for having a 'fuel economy' map and a 'power' map.

Brad Black has done a lot of dyno tuning, he'd have some good input, I think.

Are you saying that you can do both mileage and power in one map?

[Speeddog]

Are you saying that you can do both mileage and power in one map?

That's what I'm saying.

Freeway cruise or around-town 35-45mph throttle openings are pretty small, 20% or so.

[ManaloEA]

db killers do make the bike richer.

Track bikes that are required to meet sound level tests at some tracks and add killers run richer.

is it that significant that it would affect performance?

[brad black]

most db killers affect performance.  i have dyno runs for s4rs, gt1000 and bmw k1200r with and without on my site.  less air moving in a non airflow measuring system will mean a richer mixture.  it's just chemistry.  good use of a second map function.

the "one map for economy and one for power" thing is just crap sprouted by make the beast with two backswits.  on a n/alpha system you have them leaner at low throttle and richer at high throttle.  simple.  do you need max power when cruising?  no, because then you wouldn't be cruising, you'd be accelerating.  as long as it's not missing or melting, it's fine.

how did ducati save fuel with the gp bikes?  they leaned them off at part throttle, like what you use in the middle of a corner when you don't need much power.  i don't understand why it was so newsworthy, but apparantly no one had thought of that before.  must be a race bike thing and not needing to be well tuned at part throttle.  allegedly.

i really try to keep my mouth shut when i lack understanding of a subject, pity other people don't as well.

play with ignition timing too, that brings up the fuel economy.

what map did they put in it?  surely it's not a good one if the economy dived that much.  if it's a rexxer let me know the name of it and i'll have a look out of interest.

[Heath]

I never really understood the whole two map thing either.  The only time it made sense was having a more tame rain map for the really powerful bigger bikes and touring bikes.
My custom map on my S2R800 with PCIII is mapped so when I get above 50% throttle the bike really comes alive.  If I really need gas mileage I can just be easy on the bike and there is still enough power.  Now I have yet to do that on a tank because I can never seem to stay off the throttle.    I get about 40mpg and consider my riding somewhat aggressive.  I know I can get a lot more if I didn't accelerate so fast off of lights and what not, but where is the fun in that.   

[MonsterHPD]

The Nemesis ECU I have on the M900 also has the 2-map capability which I actually found pretty useful while playing around with the mapping: Stock map for regular running and warm-up etc, and the map to test as the secondary map. If the test map was crap, I could just swap back to the stock map and go on riding.

Other than that, I´ve never used this function.

[Raux]

most db killers affect performance.  i have dyno runs for s4rs, gt1000 and bmw k1200r with and without on my site.  less air moving in a non airflow measuring system will mean a richer mixture.  it's just chemistry.  good use of a second map function.

the "one map for economy and one for power" thing is just crap sprouted by make the beast with two backswits.  on a n/alpha system you have them leaner at low throttle and richer at high throttle.  simple.  do you need max power when cruising?  no, because then you wouldn't be cruising, you'd be accelerating.  as long as it's not missing or melting, it's fine.

how did ducati save fuel with the gp bikes?  they leaned them off at part throttle, like what you use in the middle of a corner when you don't need much power.  i don't understand why it was so newsworthy, but apparantly no one had thought of that before.  must be a race bike thing and not needing to be well tuned at part throttle.  allegedly.

i really try to keep my mouth shut when i lack understanding of a subject, pity other people don't as well.

play with ignition timing too, that brings up the fuel economy.

what map did they put in it?  surely it's not a good one if the economy dived that much.  if it's a rexxer let me know the name of it and i'll have a look out of interest.

Brad,
wouldn't a full map at stoic give cleaner burning and better fuel economy? although i would assume it would also run hotter reducing longevity of the motor?

[Speeddog]

The Nemesis ECU I have on the M900 also has the 2-map capability which I actually found pretty useful while playing around with the mapping: Stock map for regular running and warm-up etc, and the map to test as the secondary map.
~~~SNIP~~~

That's what I've done on my Microtec ECU on my S4.

[MonsterHPD]

That's what I've done on my Microtec ECU on my S4.

Good thing you have the Microtec. Should be functionally about the same as a Nemesis, I hear, but without the Nemesis misfire which is really dreadful

If anyone has that problem with a Nemesis, my M900 finally works almost OK after I fitted the "big" ignition coils from the ST4s. But I would prefer a Microtec    

[ManaloEA]

what map did they put in it?  surely it's not a good one if the economy dived that much.  if it's a rexxer let me know the name of it and i'll have a look out of interest.

Thanks for the response Brad. Unfortunately, I do not know which map they installed. I have Quat-D titanium slip-ons and stock intake, so I would assume they used whichever map would be appropriate for that setup.

Funny, when I first considered flashing the ECU, I thought I would get a map that was exactly as you describe; efficient at low throttle position, and more responsive at higher throttle position (kinda like the premise of only adding nitrous at WOT). But since the reflash, I have been "disagreeing" with the techs about what the mapping should be... which is why I decided to ask about using 2 maps. The techs lead me to believe that there is no such thing as a map that is efficient at low demand and responsive at high demand. I mean, I know when I want more power. And when I do, I will twist the throttle to get it. The thought of running rich while cruising at 4,500 RPM is ludicrous.

In any case, thanks for your assurance. Sounds like I just need to be more assertive with the techs and more specific as to what I am looking for. Or maybe get a Rexxer User.

[DucNaked]

I fail to see how a Rexxer user could help you. You can't edit your fuel map with it.

Do you know what the map is? Where did you have it done? Ask for specifics, you paid for it.

I'd probably skip the advice of these techs and get the PCV + auto tune and do it yourself.

[ManaloEA]

I fail to see how a Rexxer user could help you. You can't edit your fuel map with it.

Do you know what the map is? Where did you have it done? Ask for specifics, you paid for it.

I'd probably skip the advice of these techs and get the PCV + auto tune and do it yourself.

The autotune another option. However, does it give the user the type of control over the AFR as being described in this thread? Lean or stoic while cruising, moving toward rich at 60%+ throttle? Or does it assume that the user only wants max power at all times? I am asking because I don't know...

[ManaloEA]

My custom map on my S2R800 with PCIII is mapped so when I get above 50% throttle the bike really comes alive.  If I really need gas mileage I can just be easy on the bike and there is still enough power.

This sounds like the solution that I am looking for.