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|Jan 2nd, 2010, 05:34 PM||#2|
Start The Engine
Ride: 2007 FLHX
Join Date: Aug 25th, 2009
Re: 255 cam gains ?
Quote: Originally Posted by mca1989 View Post
Have a 09 FLHT
I am thinking of changing stock cams to the 255 cams.
What are the REAL gains gotton from the change (HP & Torque,0-60 & or 1/4 mile times)
Based on dyno charts I've seen, given a well-tuned bike with the usual Stage 1 upgrades (tuner, AC, and mufflers) in a TC96, you should see 6-8 ft/lb TQ and about 4hp increase, with the TQ-peak at around 3200 and HP-peak at 5000. The TQ curve will move up, not to the right, with no loss in the extreme low-end, even with stock compression.
I installed 255's in my '07 FLHX and I'm very happy with the result. I can't speculate on 0-60 or ¼-mile times, but if drag-racing is your priority you should look elsewhere, IMO, as the 255's peak at 5k RPM--not exactly where you want to peak in a racing environment. The virtue of the 255's is being able to deliver the power where you are now without unnecessary downshifting.
A good compromise of making a nice HP gain without degrading the low-end too much might be the Wood TW6-6 instead, possibly with a 4°-advance gear, and although the 255's will "come in" sooner on the low-end the 6-6's will produce more peak-HP and can tolerate more compression if desired. Which is better, or something else, is a matter of where you want the power to come in and where your priorities lie.
|Jan 3rd, 2010, 09:15 AM||#3|
Ride: 103" 2009 Ultra Classic
Join Date: Apr 15th, 2009
Location: Rapid City, SD
Re: 255 cam gains ?
the 255 is a good torque cam, I think you'd be happy with the gains over the stock cam. IMO there are better cams out there, S&S 551ES or the Wood's TW6-6, for stock heads/springs but the 255 will produce good low end torque. Make sure you use Torrington cam bearings when you do your project. good luck.