Ram Air Mod~ YEAH OR NAH?

[87gtNOS]

OEM ecu and 87 octane fuel. No timing or fuel changes. Box stock on all components except clutching and gearing. The grass drag ECU actually has the same A/F ratio as a OEM production unit from the testing I have done.

Why not run a grass ECU?? The stock one won't get out of it's way on the grass.....

 

[Srxspec]

Why would I run the grass ECU when the stock one is doing just fine?? I haven't found the grass ECU to make a bit of difference so far. I have OEM ECU in all the race sleds right now. 1-Apex ER setup for asphalt, 1-Apex RTX setup for grass drags (ISR Stock), and 1-Apex RTX setup for grass drags (local trail stock). I did have to go +20 on the Apex RTX setup for trail stock because it had a hesitation on launch. Otherwise the Apex ER and Apex RTX setup for ISR stock are all OEM electronics with no adjustments made running 87 octane.

 

[87gtNOS]

So you found +20 to make a difference outta the hole? I understood the CO settings were NOT enough to make a difference, so Yammy had to send you guys another ECU full of fuel down low and some extra timing....

When I had Dan's 'ram air' lid on my sled, I made runs with the CO at 25 and at zero, to find no difference whatsoever. CO settings only are for low rpm so I hear anyways.....

 

[87gtNOS]

Did you make your own jumper wire for the green wire to ground, or has Yammy supplied you with a 'T' connector for that plug?

 

[Srxspec]

So you found +20 to make a difference outta the hole? I understood the CO settings were NOT enough to make a difference, so Yammy had to send you guys another ECU full of fuel down low and some extra timing....

When I had Dan's 'ram air' lid on my sled, I made runs with the CO at 25 and at zero, to find no difference whatsoever. CO settings only are for low rpm so I hear anyways.....

87gtnos, yes the +20 did make a differnect out of the hole. This is the same condition some guys had on the snow where they had a hesitation if you hit the throttle from a dead stop and richening the CO would get rid of it. The grass drag ECU was to have more fuel and timing from the prototype fuel and timing maps last spring. The final calibration was much better than the prototype calibration which was in the Apex's that people raced last year (prototypes) the actual production calibration for fuel & timing from what I can tell (by mapping the A/F ratio) matches up almost identicle to what the grass drag ECU is.

The CO affects the whole fuel map. Like I said, I have a grass drag ECU sitting in my tool box and have done alot of testing with it. At this time I'm running the final production ECU, that comes on any normal joe's sled, in my grass drag and asphalt race sleds.

 

[87gtNOS]

The CO affects the whole fuel map.

This is interesting, as the local motorcycle mechanics at the dealer, with lots of yammy school, claim the CO settings on the R1's are only for low rpms....I'll have to discuss their idea on this more with them, maybe tonight if they are still there!

..and again, what method are you using to tap into the CO settings, I made my own jumper wire to ground, that I can plug in at anytime to go into the CO mode.

 

[Srxspec]

Did you make your own jumper wire for the green wire to ground, or has Yammy supplied you with a 'T' connector for that plug?

I have the Yamaha Factory Tool (it's a paperclip)! LOL!

 

[87gtNOS]

LOL!! Yammy put this wire in an easy spot for a reason, as I would suspect they have a factory jumper!!!

 

[Srxspec]

Jon,

The CO may very well only affect the low rpm settings, but I believe the FI adjusts mid to WOT throttle based on calculations from low throttle use. Therefore if you put more fuel in the low end it will carry through to top end as well during it's calculations. The Apex EFI only takes into consideration manifold vacuum at lower (under half) throttle positions, it estimates injection volume from manifold vacuum and engine revolutions. At higher throttle positions (approx half to WOT) the EFI system estimates injection volume from throttle position and engine revolution (calculated) but not from manifold vacuum.

The paperclip works pretty good. Simply un-bend it and plug it into one side then wrap it around the "clip" that holds the connectors up on the delta box.

From what I've seen the lid seems to work, but like I said a few posts back, it's too obnoxiously loud for my trail riding. I'll make my fuel adjustments via a PCIII and no one will even know!

 

[87gtNOS]

Well, I'm glad you are getting out on the tar with your sleds!! I just haven't the time, and am a little discouraged after spending last summer chasing down a blown CDI box on my Tcat. Geez. And now buying a home, so no money till next year, inwhich that'll be spent on a Corvette, or bigger bike than my ZX9, lol!!!! Priorities.

Maybe I'll go out in the garage and fire up my sled this weekend!! I miss it.


edit..oh yeah, how is Power Commander coming on those PC's for us???

 

[JDMCRX]

This is a good post. Back in the day i rember on a car we did a ram air pod for the civic and i believe at 120km we saw about a 1psi of pressure and it kept up all the way to 200km