My X1 doesn't seem to have the bottom end and mid-range torque that my old 1988 sportster had. I've heard that fitting stock sportster (D grind?) cams will increase the bottom and mid and sacrafice top end.
Has anyone done it?
I don't care what kind of helmet Kenny Rogers wears.
The stock D cams are fine for mid-range torque but if you really want low-end go for the W cams, big difference. The W's increase the cranking pressure (compression) quite a bit as the intake valve closes at ±26*ABDC vs ±41* for the D's (which is what lowers the torque peak from ±4500RPM to ±3500) and I am also told that they add about 5HP.
2005 883XLC - 42 slow jet, 2 1/2 turns out - N65A needle shimmed 0.030" with stock 170 main jet - 07 1200 W cams - mildly ported stock heads - Arlen Ness Big Sucker air cleaner with HD round nostalgia cover - Khrome Werks 3" tapered slip-ons - SE 1200 ignition module - microTach - Mustang "solo tripper" seat - 12 1/2" Progressive 412 chrome rear shocks.
Location: The Center of the Sportster Performance Universe
Sportster/Buell Model: XL883
Sportster/Buell Year: 2007
Sportster/Buell Model #2: Buell Cyclone
Sportster/Buell Year #2: 1999
What exhaust are you using?
Your stock cams have quite a bit of overlap, which makes them very sensitive to the exhaust system. An exhaust system that pushes back in the midrange will wipe out midrange power. The factory exhaust does this terribly.
You can make lots of bottom end and midrange with your stock cams.
Using supertrap exhaust. It's not that the bottom and midrange is bad but nowhere near as good as my old sportster, I wonder if the difference could be the S & S shorty G ( I think ) and the steep advance curve of the 1988 1200.
Thanks for the reply,
I'd say by all means, insure your engine is tuned properly and exhaust correctly selected before making rash guesses. The weight of the Buell should help it leap right out, compared to a stock Porkster. Few machines make it down the 1/4 mile in significantly less time than others, by being "whimpy" in the first 60 feet.