| Author | Message | ||
     Ryker77 |
I found a killer deal on twintec igntions that are labled for revtech. Same as twintec just that they have a fixed rev limit of 5700rpms. I never race and I know that 5700rpms is much safer for the engine. Plus after looking at some dyno sheets not much is to be had after 5700rpms. So how often do you guys go above 5700rpm's? Anybody need a good adjustable nose cone igntion, I bought 4 extra? | ||
| Bomber |
I don't think I've seen 5700 more than a handfull of times off the track -- I short shift alot, and let the torque monster pull me through the corners . . . . if you ride that way, you'll likely be happy too -- if not, not ;-} what benefit is to be accrued by using this ignition? I'm not at all familiar with it | ||
| Spike |
Every time I ride. Usually a couple times per trip. | ||
| Denfromphilly |
Rarely, hit the rev limiter only twice, passing old people with Jersey tags...Youse guys from Joisey know whad I mean.... However...I got no gripe with the race ECM, if it ain't broke don't fix it. What's the advantage, what's the risk? | ||
| Phillyblast |
depends on the motor. Mine now has quite a bit to be had after 5700. Before the upgrades, there wasn't much there. | ||
| Tramp |
i have run the stock, 5700 (or is it 5400 in my s2?)rev-limit ignition in mine since new. a very good rider will make efficient use of that low peak of the stocker. i enjoy my buell immensely and rarely, if ever, hit that limiter. a good rider rarely does and needs no tach. if you didn't grow up racing moto-x, you won't understand (Message edited by tramp on July 22, 2005) | ||
| Aaomy |
like they say it all depends on the motor and how you have it set up,, the main question you should be asking is will you be happy with that limit. currently mine is limited to 7000 rpm. and no i havent bounced the limiter yet. but the old girl has seen 6500 a couple times, like yesterday. at that rpm she is still climbing. not that i take her up their that often, or leave her there very long. but it is nice when you need it. | ||
| Phillyblast |
Tramp, Technically it's a 6200 limit, but it starts a "soft limit" with a ton of retard like 5400 or so. Here's a dyno sheet for my stock S2 showing it here I haven't hit the limiter yet, just got it broken in, and don't plan on hitting it much. Just pointing out that "not much to be had after 5700" isn't always the case. If you have the "D" cams, you probably won't feel it too much I guess. And it's definitely easier on the motor. | ||
| Blake |
I couldn't stand to be limited to 5,700 rpm. I may not flog the beast relentlessly, but when I do, I don't want a rev limit that cuts my operational rave range by 20% and keeps the engine from making full power, which on an X1 should be around 6,500 rpm. Yeah, what's the advantage of the thing anyway? | ||
| Tramp |
I absolutely hear ya, philly. I am keenly aware that many buell engines will make power up higher, especially with the right lift and duration cams. That 'soft limit' is what counts to me. even if i had a higher limit ignition installed (i own 'em), i doubt i'd sue that range, being my inauspicious stock S@ mill likes the '4.5k and below' stuff just fine. probably one of many reasons she's lasted so long. she's really a nice, undemonstrative motorcycle | ||
| Road_thing |
she's really a nice, undemonstrative motorcycle Reminds of that old calypso tune "If you want to be happy for the rest of your life, ________________________________" Go ahead, Trampster, fill in the blanks! I know you know the song... rt | ||
| Buelliedan |
All my stret ridden bikes including my S2 have upgraded igntions that allow me to push it to 7000 rpms and I often flog them into the mid 6500 range especially in the hills around here. I would absolutely hate it if my bike died at 5700rpms!! | ||
| Tramp |
'...find an ugly buell and make her your wife...'  | ||
| Firemanjim |
Ryker---NO!!!Shop and get a Dyna 2000 --can be had for cheap on eBay. I wish I could set the rev limiter higher than 7500 on mine. | ||
| Jackbequick |
Rykeryy said: "I found a killer deal on twintec igntions..." Is that the ones that were going for $10 on eBay? Are those a bolt-on replacement for something like an M2? I noticed they had some adjustments built into the ignition module, I guess it give you a little more fine tuning? I still have not figured out the rev limiters thing. Does my stock M2 have a rev limiter? Not that I've looked for it. Jack | ||
| Blake |
Yes. The rev limiter is part of the ignition control unit. It limits revs to 6,800 rpm. | ||
| Seth |
I put a race module on my S-1 which brings the rev. limit up to 6800. After bouncing the tach. off the red line one to many times, my bike now has acquired a rat-a-tap-tap. Smart move on your part keeping the mill in your S-2 below the 54k mark  | ||
| Blake |
Race modules don't raise the rev limit. They do avoid the ignition timing retardation that kicks in around 6,200 on the stock ignition modules though. | ||
| Seth |
Well the ignition system avoided the retardation; I apparently didn't  Now I have a brand spankin' new set of pushrods, tappets, gaskets, and piston rings for my bike. Save your money folks, treat you bikes with respect! | ||
| Ryker77 |
Thanks for the replies. About what I thought. Depends on riding style. My bike has huge cams Andrews N80, Nallin XB stage 3 heads, which would make for alot of power after 5700rpm's. But I'm also running 12:1 30 degree piston. So even if I limit myself to 5700rpms the bike is still the fastest I've ever owned and much faster than I feel safe riding at. I normally short shift and use alot of torque. I enjoy the sound. Hell for $10.00 I couldn't pass up on a adjustable igntion and it even has the ability for fine tuning on a laptop, normally these cost over $200. And I bet I could send the igntion back to twintec and let them adjust the RPM limit. Besides its the last thing I need to convert my X1 into a carb non ECM bike. | ||
| Tramp |
forthe knobbier cam alone, i would run the higher rev limit, were i you! Go for the revs | ||
| Phat_j |
higher than 7500 jim? better be some damn good components in there jim, or your asking for trouble imho. dont u agree? | ||
| Tom_b |
I must be rough on my bike, my rev limiter kicks in at 7000 and I hit it all the time. Just something about that screaming v-twin that I like | ||
| Jersey_thunder |
not that i take her up their that often. YEA..SURE..  | ||
| Smoke |
i think jim wants more rpm for the turbo salt runs! ride safe, tim | ||
| Denfromphilly |
I agree with Ryker, I got a modified motor and it's so preposterous I have never done even close to a full throttle launch. A fast rev to 5K and three shifts has me at 80 in like 4 seconds, fast enough for me! The times I did bounce off the limiter my bike was pulling like a freight train, it had plenty of power curve left. I just can't imagine and old tractor mill likes to turn this fast very often or the valve train will commit harikari. | ||
| Aaomy |
guess the only thing i dont understand is the purchasing of such expensive parts to complete a monsturious motor and then skimping out on a component that really "would limit" your engine. personally i run a thunderheart b2 smartfire. it lets you adjust everything. even things you shouldnt. it even has the capability of nos or air shift control. valve train harikari-- i like it but just food for thought, and im sure someone will corect me if im wrong, but the xb9 is rated for some thing like 7500 rpms, and the xb12 is rather like 7000? i didnt think it was valve train, more piston speed and distance that limited the old girls maximum rpm's????? and yes i know that different heads have different rpms before they start to hit valve float range but its just an example. a motor is a sum of its parts. you really need to know the capabilities of "all" your components and adjust your engine accordingly. if your not sure where you want your rev limiter set i would call up NHRS and ask them, make sure they know what heads you bought and the cam you are running. its not gonna hurt anything having a rev limit that low. its just limiting you bikes full potential | ||
| Jackbequick |
"..its not gonna hurt anything having a rev limit that low..." I think that was Ryker77's point. I'm well beyond the "boy racer" thing and like machines that produce adequate power with reliability over an RPM range that does not over stress or threaten the engine. I bought one too! Jack | ||
| Ryker77 |
Aaomy, I didn't buy all of the performance goodies that are on my bike. NRHS stage 3 heads, Andrews N80 cam, CP pistons, zipper adjustable pushrods, force intake, force exhaust. They all came on the bike! I was simply on the market for a used X1 with force intake and exhaust with some carbon fiber. Those $$$$$$ heads were just a plus. Jack, I confirmed with twintech that the igntions are the same. I can forward you the email if you want it. ----The bike is plenty fast enough for me at 5700 rpms. I just like to make some noise  . Hell I used to have a supercharged LT1 camaro that never went beyond 120mph,, though the revlimit on that car was abused alot!!! | ||
| Denfromphilly |
I bought mine the way it was too, it had a bargain basement price over the winter, someone spent too much money and needed cash. Wild machine, and honestly this is my first HD motor, I don't know what part will grenade first but I do feel that high rev's can't be good! I bought mine because I liked the styling....Den | ||
| Rick_a |
Most stockish Buells make peak power around 6000-6200 rpm. I'd want at least a few hundred RPM over-rev. For a stock stroke anything below 7100 RPM is considered pretty safe for a streetbike. Your bike should surely be making power to that. Don't do it! I often hit the rev limiter doing wheelies or racing friends and what not. The lifters valves, and valve seats were a little beat up after 19,000 miles of such foolishness. | ||
| Smoke |
seth, my rat a tat tat turned out to be coming from the front rod or rod bearing. anyhow, now i can see the rod dangling from the front piston through a 2" hole in both cases. uh oh! i thought my noise was coming from the top end also. not any more. | ||
| Jackbequick |
Ryker77 - "I confirmed with twintech that the igntions are the same. I can forward you the email if you want it." Thanks for the offer. If you have any info on installation, wiring, mode and slope settings, etc., that would be great. I had not started looking yet but maybe there is something downloadable on the net. I'll post a link here if I find anything on it. Jack | ||
| Jackbequick |
Ryker77 - Was a local bike shop to get a gasket and they had a custom chopper there with a suspected dead RevTech module just like the ones we just got on eBay. In talking to him about using one on a Buell, he said I would have to use two coils to use that on my M2. There was some chatter about single fire and dual fire systems that was over my head but, if I understood it, that is a single fire ignition and requires two coils. Jack | ||
| Jackbequick |
A question. When a M2 hits the rev limit what happens? What would be apparent to the rider? And if you keep the throttle open, does it just stay at the limit? By modulating the ignition off and on or something? Thanks, Jack | ||
| Denfromphilly |
Hmmm, when my X1 hits the rev limiter it feels like a bee buzzing in my pants, very odd as the limiter creates a miss every 4th combustion cycle, you will know something is wrong! | ||
| Rick_a |
There are a few coils out there that are a single coil with two single fire outputs that are not much bigger than the stock coil. There's the stock H-D single fire, the Screaming Eagle, and the Dyna. I'm sure there's more, but those are the ones I'm aware of. It'll stop accelerating abruptly and makes a frantic sound almost like bad pre-ignition. Sometimes if you're accelerating hard it'll go past the limiter due to inertia. | ||
| Ryker77 |
Ryker77 - Was a local bike shop to get a gasket and they had a custom chopper there with a suspected dead RevTech module just like the ones we just got on eBay. In talking to him about using one on a Buell, he said I would have to use two coils to use that on my M2. There was some chatter about single fire and dual fire systems that was over my head but, if I understood it, that is a single fire ignition and requires two coils. Well that "shop" gave you wrong advice on the coil setup. So if they don't even know about coils then I doubt they know how to trouble shoot an ignition system to prove the revtech module is bad. You can read the install manuals on twintecs webpage. The ignition does require a 3ohm single fire coil-- aftermarket crane, dyan, twintech all make them. about 60-180.00 dollars. I am using a dyna dc6-5 coil. REVLIMIT-- high end igntions like twintec use a soft style revlimiter. You an read about this on there website. "The Model 1005 uses a newly developed RPM limiting algorithm that has been highly optimized for odd firing V twin engines. When the engine is held against the RPM limit, cylinder firing is always paired. This eliminates a torque couple and results in very smooth operation compared to random or sequence type RPM limiters. Which is safe on the engine when hitting the limit. I don't think it is wise to run any engine at the limit for any period of extended time. You might not feel anything becuase the 1200cc twin will be shaking and making all kinds of noise. (Message edited by ryker77 on July 29, 2005) | ||
| Jackbequick |
Thanks for the info and source, I had no luck at all finding anything. Jack |
