| Author | Message | ||
     Wolfridgerider |
Any ideas why? 12R has race ecm and Spec.opps/Drummer exhaust can that I made myself + K&N air filter 9R has race ecm, Jardine & K&N air filter. My first thought is back pressure or I should say the lack of it. Is there anything else I should look at? | ||
| Zoedogg1 |
Fuel...higher octane. maybe a good octane boost additive. I did that and it seems to make a pretty big difference for me. | ||
| Point_doc |
Thinking out loud...with the gas issues I am wondering if and what they may be using to stretch the fuel supplies? I have been noticing a difference in my bike, but I first noticed a difference in my wife's car pinging. The car is an '03 VW Jetta completely stock and I had never noticed this before. I am in Cali. and who knows what goes in our gas to meet the EPA. Just a thought...maybe nothing. (Message edited by point_doc on June 13, 2008) | ||
| Wolfridgerider |
I don't think its a fuel issue. The 12R has 100 octane unleaded race fuel in it. I have no idea what the 9 has but I'm sure its premium.  | ||
| Rubberdown |
A TPS and A/F reset helped mine significantly. '04 12R with race kit. | ||
| Mr2shim |
Thinking out loud...with the gas issues I am wondering if and what they may be using to stretch the fuel supplies?  | ||
| Werewulf |
prolly H2O... | ||
| Tmall |
Except that fuel and water do not readily mix.. | ||
| Tpoppa |
On a 9 with a Race Ecm and Spec Ops or Drummer...It will run rich from 4k-4.5k. Opening up the airbox will help some. To completely get ride of the dip you need a custom map for your exhaust. | ||
| Ft_bstrd |
I noticed the same dip at 4,000 RPM. It was much reduced when I added the 07 airbox. Plus the intake growl was a nice side effect!  | ||
| Wolfridgerider |
The air box is open on the 12. I installed a small baffle last night and took it for a very short test ride. It seamed to help a little. I wont know until I get back to the track. I would love to have taken it for a longer ride but in its current state of dress I would be asking for trouble..... I'll keep ya posted | ||
| Nuerburgringer |
The torque dip at 4000-5000 RPM is notorious on XB9s with aftermarket exhaust, very well known. A later model airbox together with the race ECM (or re-map) will partially solve the problem, but it'll never go away entirely. Gonna have to live with a good chunk of it. Do some BadWeb searches on this topic, dating back into 2002. Jardine muffler on XB9 was one of the least bad offenders where the midrange hole was concerned. Drummer wasn't bad either. But the hole is there. Just make sure you have a late-model airbox lid on there, and a race ECM or re-map. That's all you can do. Have a look at American Sportbike's XB Exhaust Shootout, available on their homepage. You will see the midrange hole in their charts, in all its different guises. AS includes commentary on which options worked best against the hole, for both the 9 and the 12. As for XB12, I have no direct experience. But the original muffler had that valve in there to keep the midrange fat. You likely removed the valve, and are experiencing the consequences. In both cases, compromises are made to increase horsepower. We have to live with those compromises, or live with less horsepower. Nature of the world. This is a seven year old topic here, with a ton of stuff available via a BadWeb search, a good knowledge vault. Have a look. | ||
| Werewulf |
Except that fuel and water do not readily mix.. . . really? you mean H2O is water? | ||
| Jimduncan69 |
Could it be a power to weight ratio problem???? hmmm how much pizza was consumed before these said "test rides"? | ||
| Jos51700 |
"As for XB12, I have no direct experience. But the original muffler had that valve in there to keep the midrange fat. You likely removed the valve, and are experiencing the consequences. " Listen to this man. The valve in the exhaust fills in the dip in midrange torque quite nicely. No tuning or conglomeration of intakes will completely eliminate it. It is a consequence of multiple dynamic forces. It's neat to run a stock 12 on the dyno, and hear the volume change as the valve opens and closes. | ||
| Xl_cheese |
Is the bike tuned for the slow burn of 100 octane? That may be your problem. Try 93. | ||
| Fresnobuell |
On my stock 9SX, there is a noticeable and well-known dip from 3,000-4,000 RPM. Nature of the beast. It isn't really an issue as when I care to wick it up, I ride above the torque dip. Easy. | ||
| Id073897 |
From what I saw at the dyno, a new problem will occur with the race ecm and an open airbox: afv will rise and WOT get too rich. http://www.xborgforum.de/forum/album_pic.php?pic_i d=8985 red=2003 airbox blue=2007 airbox, before calibration green=2007 airbox, after calibration Had all been done with stock muffler, so don't take numbers literally. The effects will however be similar. Regards, Gunter | ||
| Packrat |
Had the same "dip" on my '07 XB12S..stock ECM and a Special OPS tailgunner pipe fixed it. I swear mine runs better with this setup...just my $.02 | ||
| Deadduck |
you noted that you made the can yourself, try more back pressure. Mine really wakes up at 3900+/_ and has really good pull to red line. I also did my can myself and after a few trial and error runs, I finally got the flat spot down in the rpm range where I don't feel it any more when I'm playin. I posted my can mods somewhere on the xb board, just do a search for posts by deadduck | ||
| Wolfridgerider |
I had a Drummer and copied it for the most part. It just started to do this the last time I was at the track during practice. So I bought the 100 proof gas to see if that would be the cure. NOPE... still there during the race... Let me tell ya. When you are leaned over in a long sweeper with you knee on the pavement.... rolling on the throttle.... then.... $HIT!!! The bike would get outta shape and I put a crease on the seat! It was fun! Every lap for 30 minutes! | ||
| 1324 |
I, too, have just noticed this problem on my 03 XB9. Up until last winter, the only engine mods were a swiss-cheesed 03 airbox. No major flat spot to speak of. It wasn't really strong in the 4000-5000 range, but it wasn't a hole either. This past winter I bought a used 04 airbox and modified it to make my own open airbox. I coupled it with a K&N (save the comments) to see how it would run. I've been told by numerous sources that the stock maps can account for small changes like airbox mods. However, the hole at 4000 surfaced, and not in a minor way. I've seen the dyno plots and the hole is evident, but I honestly didn't think I'd feel the hole as much as I do. My first thought was that it's either entirely too lean or the timing is retarded too much (I've done no datalogging to verify this, however). I then picked up a used Drummer and flashed the race map on the bike hoping the hole would be partially removed. NOPE. IMO, the hole is more noticeable now than it was before. Suffice it to say, I want it gone. If I wasn't so busy with my job and a new house, I'd look into fixing it. Any thoughts on tuning it out? Normally, I'd probably leave it alone and ride around it, but it's quite the nuisance. Unfortunately, it's right in the mid-range meat where you find yourself looking for power to pass. The 5000-redline rush is good, but to stay in the meat, I'd need to redline shift each gear. This isn't something I like to do on the street. Track is one thing, but not on the street. This hole has me seriously bummed... | ||
| Xl_cheese |
I would contact xopti on how to tune your bike with ecmspy. Anything above 3k rpm was MUCH more peppy. Even at lower rpms and high TPS the bike would pull harder. | ||
| 12sbuell |
I just added the Daytona Twin Tec Twin Tuner to my bike and it resolved all of the fuel issues that I had. I'm still tuning on it but it is very user friendly, easy to install, and cheap, 200 bucks. | ||
| Fresnobuell |
1324, sounds like you created the problem yourself. The open airbox should not affect things negatively. Just shows you that Buells are good out of the box. | ||
| 1324 |
I definitely created the problem myself, lol. Everywhere outside the 4000-5000 window is great, though. It pulls smoothly and strong from 2000 RPM and the 5000 RPM rush is good for a XB9. Just want my midrange, too. Can't have it all I suppose. | ||
| Mcgiver |
I dont get it! My front tire jumps in the air at 4 grand,Mine must be broke. Brian | ||
| Wolfridgerider |
 so does mine....ULY STYLE! |
