| Author | Message | |||
     Ferrisbuellersdayoff |
According to Halsracing in this post the throttle bodies are diff at the mouth 45mm & 49mm... would a 12 TB bolt onto my 9? http://www.badweatherbikers.com/buell/messages/327 77/336244.html?1202909901 | |||
| Rocketsprink |
Yes, it will. | |||
| Brumbear |
would you have to change ecm to a 12 or could you keep the nines | |||
| Glitch |
I'm thinking if your nine is newer, and has a race ecm, it may be able to handle the new injectors, and air flow, as long as you didn't go too far and use an open air box. | |||
| Saintly |
I believe I read somewhere that the 06' and newer bikes have a common size(49mm) TB for both the 9 & 12 engine. It occurred at the same time as the re-designed factory open airbox with the intake grille behind the fuel filler. | |||
| Brumbear |
on the buell website they still list 45mm for the cityx and 49mm for the 12 however that doesn't mean they didn't change it anyway | |||
| Rydberg |
can you just put '07 9 pistons in a '07 12 to get the 11.25:1 leaving everthing else the same? and here is a good article on TB's and some good old tech. http://www.motorcycle.com/manufacturer/kawasaki/20 05-kawasaki-zx6r-15719.htm | |||
| Brumbear |
I didn't know the pistons were different I thought the crank and rods made up the stoke change and the pistons were the same if they are shaped different the nine if domed or longer may change the compression chamber to much with the longer stroke of the 12 | |||
| Ericz |
The fuel injectors are the same between the 9 and 12. Every 12 has a 49mm TB and every 9 has a 45mm TB. You should stay with the same ECM if you swap TB's but the mapping may be a little off due to the change in VE. The pistons are different. 9 pistons with the 12 stroke will give a higher compression ratio than the stock 12. | |||
| M1combat |
It'll give you 14:1 as I recall. | |||
| Trojan |
It'll give you 14:1 as I recall. Which unless you have access to some very high octane fuel, will have the same effect on your engine as taking a very large hammer to the cylinder heads  Unless you are racing I wouldn't recommend it! You could try Wiseco pistons instead. They do a 12:1 compression forged piston that works well in the XB12. We used these last year on our race bike using a mix of pump fuel (98octane) and oxygenated race fuel (109 octane). | |||
| Alex |
XB9 pistons in a XB12 won´t give You 14:1 but around 12:1 | |||
| Saintly |
Just found it. I thought I was going crazy, but I did read that the throttle bodies are the same somewhere on here. Heres the link: http://www.badweatherbikers.com/buell/messages/327 77/317523.html 6th post down. "The 12 throttle body should work with the 9 ecm as well, the only difference was the diameter. In 05 all the 9's started running the same size t-body. " | |||
| Rydberg |
(for a regular street application) Will having 12:1 on a bone stock xb12 hurt it? being wisco or a xb9 piston doesnt make a diffrence to me just the physics behind the theory. if you keep all jetting stock and no air intake or exhaust change it should work with the stock ECM right? I Would never yank out a perfectly good piston, but if i ever fry one for whatever reason,this is good info to know. having a 12 with 12:1 just sounds cool. | |||
| Rydberg |
Unless you are racing I wouldn't recommend it! now if you were racing, would that not put extra strain on the heads? with a street application it should be less stress on the heads, right? | |||
| Nuerburgringer |
"having a 12 with 12:1 just sounds cool." Hate to rain on your parade, but I'm not too crazy about that kind of rationale. I'd be asking myself, "What problem am I attempting to solve via this modification?" You could very well trigger a cascade of side-effects via such intrusive mods, so make certain that you know where you're going with that kind of thing. | |||
| Lamo |
there won't be any extra strain on your heads,the extra loads will be on your con rods big ends ,small ends and head bolts if you up the compression | |||
| Rydberg |
Hate to rain on your parade, but I'm not too crazy about that kind of rationale. there won't be any extra strain on your heads,the extra loads will be on your con rods big ends ,small ends and head bolts if you up the compression thanks, would never do this just because it sounds cool, but when something does sound cool i like to look into it at least. i would never do this without the consult of a trusted mech. and dont plan to ruin my motor anytime soon, so i don't think i will be needing work like this, just talkin. Thanks for the input. | |||
| Ferrisbuellersdayoff |
I have an `03 9R equipped with a race kit and if i get a `03 12 Throttle Body it will work? (with an added benefit of more power) I put a larger TB on my Jeep once and it added a decent amount to the butt dyno... has anyone done this? the race kit and 12 TB that is? kinda looking for someone with first hand experience. | |||
| Saintly |
if i get a `03 12 Throttle Body it will work 12's started in 04' | |||
| Brumbear |
why does buell list still a 45mm for the 9 and 49 for the 12 this is a copy of the specs&pricing sheet for the 9 and 12 hope it works here you go
| |||
| Metalstorm |
I'm almost certain that the 9 still has a 45mm throttle body. The change in 05 was that it became a one piece throttle body like the 12 has but stayed at 45mm in size. (Message edited by metalstorm on February 14, 2008) | |||
| Speedfreaks101 |
Why do you want a larger throttle body? Have you surpassed the ability of the stock unit to supply the engine with air? Where will you gain and where will you lose? My reason for these questions is this: A larger throttle body may supply more peak power and maybe even more average power with no load. Once you add a load the power gain may result in less throttle response and no usable increase in power. IMO the throttle response (even when our ecm is tuned to the application) leaves much to be desired (too much to quick). Throttle response needs to be improved before the volume of air can be increased. I think that if we were to use a progressive dual throttle body ( two blades that open progressively) that it would greatly improve throttle response. This would also enable us to use a larger over all size throttle body with no compromise in throttle response. Just a few random thoughts, Bart | |||
| Alex |
Bart, remember it is an injection system not a carburetor.Good fuel atomization is provided by the injectors and we do not need high vacuum to draw fuel from a float bowl. So the rules for injection systems are a little different from carburetor basics. Regards Alex | |||
| Jos51700 |
Bart, typically in an injection system, a larger throttle body results in more response, and a too-large throttle body will typically require a cammed throttle pulley to reduce excessive response. There's a thread in the 1125r world that covers this. | |||
| Jos51700 |
Progressive throttle bodies are used to reduce the throttle response (and enhance tractability), not increase it. | |||
| Rydberg |
here is a good article on TB's. http://www.motorcycle.com/manufacturer/kawasaki/20 05-kawasaki-zx6r-15719.htm | |||
| Hogs |
I have a Throttle Body off a xb12 With Injectors etc.. if you are interested in one 105.00 plus shipping.... | |||
| Vwflat4driver |
I'm a big vw fan and there was some hesitation in Hotvw's magazine about using 48mm tb's in an engine build that was specifically desighned for fuel economy!that theory was dispelled in the dyno room and in the drivers seat. it was better throttle response and better fuel economy(over carburtors) and the guys were amazed because of the size of the tb's( weber based desighn using 48mm tb per cyl. i believe engines size was 76mmS X 85.5mm B netting 1745cc) |
