Difference Between Cam or 103
#22
I went with iclick suggestions, and found that he is right on with his comments. As you can see from my signature picture with the comments below you can tell what I have done. Now with that said I had my bike dyno tuned when they installed the SEPRT that was to get the air fuel mixture correct. But the results from the tune were, 64.86 HP and 85.16 max torque. The torque band starts performing just over 2000 rpm and starts falling off just past 3000 rpm. Now with that said I am not into speed but with the Ultra it is a beast of a bike and just needed some help at the lower end. I am satisfied............
#23
#24
I bet theyre quoting keeping your stock pushrods and pulling your rockers. If you cut the rods and install new ones, the job should take between 1-3 hrs depending how difficult the pipes are being. Fair book should be 3-4 hrs.
#25
#26
The thing with the 255 cams in a 96 is that it shifts the torque band so far to the left that the motor comes on RIGHT NOW when you open the throttle. Mike Stedman at Latus Motors has said that there are no cams that will beat a set of se255's up to 3500 rpm. Which is where many of us touring bike owners ride.
I have a stage I 103, and I can tell you it feels stronger than any 96 I've ridden that didn't have cams done.
The other way to increase hp and torque across the entire band is to increase compression. Changing cams is not just about raising hp and torque, although it sometimes does that. It's about improving performance by dialing in your torque curve to where it's most effective. That's why cam selection is so critical.
I didn't want to get that invasive with my upgrade for several reasons. For one, the cost and another that I had a good-running bike already and didn't want to fix what wasn't broken. If I wanted more after a cam upgrade, which isn't that invasive, I could do it and only lose the time it took me to disassemble the rocker components. As it is, I won't be making any more performance upgrades to this bike, as it is just what I wanted. I rarely give this bike more than half-throttle for anything.
I'm an old school hot rodder, and I can tell you for a fact, I've made fast cars slower by putting in too much cam and carburetor.
I think it would be interesting to actually square off a stage I 103 against a stage 1.5 96 (with 255's.) I'm not talking about comparing dyno charts, I'm talking about finding out which is actually faster.
I will be putting in 255's in my bike very soon. I think that's going to be pretty interesting to see how they affect performance in an already well running 103.
Last edited by iclick; 03-28-2010 at 11:18 AM.
#27
They are low, and most TC96+255 combos run low-80's for HP, at or near 100 for TQ with a very flat TQ curve from 2000-5000 rpms. I saw one that was dynoed at 85/104, which is the best I've seen. These low numbers may be a matter of tuning on a non-Dynojet dyno, as some can show low numbers like this by design. The dyno guys out there can offer more info on this, I'm sure.
#28
They are low, and most TC96+255 combos run low-80's for HP, at or near 100 for TQ with a very flat TQ curve from 2000-5000 rpms. I saw one that was dynoed at 85/104, which is the best I've seen. These low numbers may be a matter of tuning on a non-Dynojet dyno, as some can show low numbers like this by design. The dyno guys out there can offer more info on this, I'm sure.
#29
It's funny when I hear that adding a performance cam always shifts the torque curve. Keep in mind, the EPA cams require compromises for emissions that mild performance cams do not. Often times, you can end up with a much broader torque curve, not just shifting it to the right or to the left. Of course you can overcam leaving you wanting at low revs without the headwork, compression and other flow items that don't allow you to take "advantage" of the caracteristics of that wild cam. Just be honest with you're riding style, match your cams with your other componants to optimize what you have. Even with my SE204's, I wonder as I'm climbing the top of the rev band, should I have gone bigger? After a careful review with the way I ride (which is pretty agressive, but not ***** out and I still like 6th gear) it works pretty well and should work well as I increase displacement with the addition of minor head work.
#30
I think the two might be fairly equal in peak-HP, but where the cammed bike will shine is the TQ in the low-end and midrange. Like Mike Stedman said, they are awesome down low, and I suspect the cammed bike will easily pull the uncammed 103 up to about 4500 rpm. However, in a *****-to-the-wall drag race where RPM's stay above 5000, I think it would be close.
I pulled the 103 down low, and was able to pull ahead through the first 2.5 gears. After that, this guy was able to slowly reel me in - but never got ahead of me. This was ***** to the walls 1/4 mile type runs. I was shifting around 5200-5400, and he was shifting at 6200.