| Author | Message | ||
     Vonsliek |
i am SERIOUSLY considering having my xb12r 88" big bored & stage 3 headed .. is it nallin's? looked at the prices & they seem fairly attractive considering the idea of a 130+ rwhp/110# tq. racebike. either i get a I4 racebike or i take the buell & max it out .. will do anyway. w/ chain conversion & gearing, fork internals uprated & a race shock (penske, elka, ohlins ..) this shd be a right handful no?!  so .. yay or nay racers out there?? its only abt US$2.7k for all in .. cases bored also. i'll do all assembly. sounds like THE deal .. considering in canada the damn dealership wants CA$850 + tx for rear subframe .. i can tell a freaking ripoff when i see one .. i LAUGHED in their faces, those egg-sucking dogs! | ||
| M1combat |
You need to do Cams and exhaust for sure. A good race exhaust that'll flow well. You'll need to actually talk to your part supplier as well to make sure that they know exactly what you want from your engine. If you want a street bike you want a very broad power curve even though it'll sacrifice peak numbers. If you want a race engine you want everything you can get in the RPM range you'll use (probably 4300-6300 for a 12 that'll last a while w/o a complete rebuild). If you want to freshen it up ever race or two you can add 1200 RPM and have significantly more power, but significantly more headache as well. In any case... I'd talk to the sponsors that race if that's what you want from the engine. Don't build it to race if you're using it on the street though. You'll shoot yourself in the foot. As far as to do or not to do... Do it... | ||
| Indy_bueller |
You'll definately need a custom mapped ECM to get the most out of it. I would probably do a Micron exhaust too.....you'll want the best exhaust scavenging you can get with all that extra displacement. | ||
| Bubabuell |
With those numbers in mind you could as well consider the 48mm header/reverso exhaust from Trojan. | ||
| Blake |
VonS, Call Cycle Rama or Revolution Performance and talk to them about what you are wanting to accomplish. You won't go wrong with either of them. | ||
| Diablobrian |
In the state of tune you are talking about (130+ rwhp) that motor will not have long service intervals. It will need to be freshened up pretty routinely. These motors are stone reliable up to 105-110 rwhp or so, but beyond that the reliability goes down very quickly as you increase the hp. If this is your street bike I'd go with a milder state of tune. Also what classes are you wanting to race in? Thunderbike in particular is restricted to a 4 lbs to the hp formula. a 130 hp bike would have to weigh in at 520 lbs wet to be legal. You'd need to strap 70 lbs onto your bike! Also I'd reccomend having the shop assemble a race motor that was pushed that close to the edge of the envelope. There are a number of tricks that a good builder picks up over the years that can make the difference between a monster, and a grenade. You also will need a real race ecm, or direct link tuning, and a lot of dyno time to get that kind of motor running right. Also stock throttle bodies will only flow enough for 105-110 rwhp before they need to be bored and the injectors upgraded. As well as cams and a pipe. Rhinehart or force are about the only options at that level of tune, although I have heard that some teams are running the micron, or imported pipes. All of those things will take you out of the realm of common ECM mapping. |
