| Author | Message | ||
     Yabuell |
What mods would be needed to make a xb12s make 100 rwhp & drive it daily on pump gas without a power adder? | ||
| Blake |
What is a "power adder"? And do you really just want 100RWHP, or do you want improvement where you spend most of the time running the engine, like down low and in the mid-range? Or all of the above? Opened Airbox, performance exhaust, ECM tuning to match will get you there (the all of the above approach) or very close to it. Add some good cylinder head porting and you are there and then some. | ||
| Alessio66xb12r |
a big bore conv. 88 or 90 will give you a big power everywhere from 3000 to 6800 and up . not an easy "bolt-on" operation . bye Alessio to Blake power adder maybe octane booster | ||
| Blake |
Thanks for the translation Alessio.  | ||
| Spike |
I think a power adder would be something that added power to the engine aside from naturally aspirated methods, such as a turbo, supercharger, or nitrous oxide. | ||
| Yabuell |
Yes spike, thats what I'm referring to. I really like the idea of a turbo but it seems the tuning still is a issue. I'm sure with a turbo I could make 150hp easy with the right tune and by removing some compression. Blake, If I could keep the bottom end power that It makes now and really come to life at say 4500 - 7200rpm would be the ticket for me. | ||
| Jayvee |
egyptian snake on steroids = power adder Doesn't seem all that hard, just add money: intake, exhaust, headwork, big bore kit, and cams. Maybe knife-edge the crank to make it spin up more lively. There's sample dyno reports on several vendor's sites, find one you like and see the notes of how they did it. Most just list variations of the above things. | ||
| Bombardier |
Out of curiosity is the knife edge crank noticeable with a dry sump setup? | ||
| Jayvee |
My understanding is it's the lightening more than the oil drag, but I can't say for sure no. | ||
| Alessio66xb12r |
lightening the crank on a street bike ??? when i did mine ( crank balancing) i asked them to lighten it to ...this was the answer : " on xbs i will NOT lighten a crank anymore...".... "race engines or street engines i'll make i'm tired to blowing motors for this practice " Marcello from FreeSpirits race team , the only REAL team i know in Italy racing Buells. just an opinion. bye Alessio | ||
| Rick_a |
The right guy doing headwork is probably all you'd need. | ||
| Medic352 |
Well, have you dyno'd your bike. I mean my '04 XB12R made 94 HP to the wheel on the dyno(Cycle Connect HD, Joplin, MO) with a stock can, K&N, and a stock ECM. Got to start some where. You can gain some HP from synthetic oil. Obviously the air filter, porting the heads and changing exhaust. My race kitted XB9 made 80 HP to the wheel. | ||
| Yabuell |
SO Rick, think I can get 100hp with stock exhaust and just a good cnc port job? I'd love to keep it quiet... | ||
| Rick_a |
Talk to a few knowledgeable head porters | ||
| Yabuell |
Ok, who are the top three cnc head porters on the site? | ||
| Blake |
Talk to them all and go with the one that you feel best about. The important thing in my view is to not tell them what specific work you want, but to tell them what kind of performance you want and let the seasoned experts advise on how best to achieve that. Your description above (maintain low end, increase mid- and top-end) is excellent. Cycle Rama Hal's Speed Shop Johnson Engine Technology Ray Price H-D/Buell Revolution Performance | ||
| Acejay |
what sort of effect / benefit could you expect from porting the heads on an XB. Would there be any effect on its own, or will it only show up with a custom tune? | ||
| Yabuell |
I think my goal now is over 100hp to the rear wheel with stock cams and exhaust. The 6800 rpm rev limit is a joke with the right parts. I'm more than sure I can make this power with more rpm and better flowing heads alone. So I'd say the tune is going to be a big part of it but it's going to have to work as a group of matched components to exceed my goal. | ||
| Bombardier |
Personally I would be updating to the 08 crank and conrod before trying to get too much out of it in the way of revs. There have been some conrod bearing failures in that the rod big end has gone out of round. I think that trying to rev it more than they currently do will be pushing the limits of the conrod. My 2 cents. | ||
| V74 |
for a street bike 7100 rpm should be where max hp is,with 100 rpm (7200) over rev,which requires new ignition to set a 7200 rev limit,XB heads help(if you can afford them,i cannot)otherwise ti retainers and ali pushrods will save just over 200g,forged pistons will save about 50g each,with t/s heads go for a 10.5 to 1 comp ratio,that and head porting and 536cams OR high ratio roller rockers and some dyno time to get the fueling and ignition spot on should get you a reliable 100rwhp imo. | ||
| Rick_a |
I'm a fan of so-called "high velocity" porting, where the ports are welded-up and reshaped for higher flow. The dyno charts (for those that post them) tend to give away which shops do this kind of work. The torque curves tend to be pretty flat overall compared to the big humpy/lumpy-looking curves of traditional port jobs. I chose a shop based on this as well as one that used combinations similar to what I had in mind. | ||
| Diablobrian |
With the right combination of parts 100rwhp is certainly attainable from a fairly stock xb. The Drummer ss and micron exhausts show good results when combined open airbox and a properly tuned ecm. See the American Sport Bike exhaust shootout results for examples. This is not cheap, with dyno/tuner time being a large part of the cost. however, improper tuning can cost you far more...ie. blown motor so do not skimp on the tuning. Prior to direct link tuning and these exhaust systems 100rwhp was rare on a Buell, but these days it's becoming easier to attain, but still nothing like common. I reccomend that you get in touch with a tuner you can trust and discuss what it is you want from your bike, and what you really need to do to get it. You may want to focus more on the quantity and location of peak TORQUE rather than HP because that is where the Buells excel. Peak HP is good for bragging rights, but your Buell is never going to be a "top end monster". V-twins are ALL about grunt and drives off of corners. A broad flat torque curve will deliver this in spades. Just something to consider. | ||
| Cyclonemick |
I'm not a engine builder but It would be safe to say that you Will have to change your Exhaust! Engines have to be able to breathe and if your wanting the HP your talking about, You will need more airflow. That being said, I'm sure you could find one that is not obnoxious or loud! ( I personally like them that way!) Listen to the advice given above. They are some really good resourses in this community and I would go with one of the performance shops listed above in Blakes Post! | ||
| Yabuell |
To say I know little about buell motors would be a understatement. But however I feel the exhaust isn't holding the motor back. First of all look at the hp graph of a stock xb12. It pulls to red line! That's kinda why I feel more rpm on a stock bike would get closer to the 100hp mark with no mods at all. Second, I was thinking why would they go through all the trouble of installing a servo operated trap door in a restrictive exhaust? A restrictive exhaust makes great tq already. I may not be correct on this but I thought the rpm on the dyno graphs from the American Sport bike shoot out were above stock spec? (Message edited by yabuell on June 02, 2008) | ||
| Yabuell |
Ok, turns out I was wrong about the rpm levels being raised... Looks like I'm going to call Al at American Sportbike and get a catch can 2-4 hp! | ||
| Slc4me |
call dan baisley at baisley high performance in portland oregon. He has a huge amount of expierence with the xl/buell based motors and is very down to earth tell him what you want and he will get you there at a fair price i might add. He got a 80" evo big twin to 97hp and 100tq for a friend of mine for less than a grand. Now you can go all out with dan also but he is who i go to for every one of my drag race motors | ||
| Buellrcr |
put a micron pipe , 9 pistons,tune , 100hp and 82ft lbs, torque, and is street able. | ||
| Yabuell |
Well, isnt that going to put my c/r close to 12-1? Thats going to ping in the heat on pump gas wont it? | ||
| Diablobrian |
11.43:1 and it will run fine on 93 octane. I have even gotten away w/ using 91 in a pinch but don't recommend it. TANSTAAFL |
