New M8 stage IV
Member
Joined: Jul 2009
Posts: 4,310
Likes: 1,079
With the stage IV, you've increased piston diameter without changing stroke. You're going to move the torque curve up the RPM range. You're giving up very little on the bottom end to increase it everywhere else. I'd make that trade every time. Look at the comparison dyno sheet.
Last edited by Heatwave; Jun 15, 2017 at 06:12 AM.
Advanced
Joined: May 2013
Posts: 50
Likes: 2
From: Central NJ
I was able to get 119hp/114tq on my CVOSG. Im now satisfied, although I was initially disappointed w/ my numbers. I was expected 120+/120 after looking at the owners Stage IV CVO Limited with 134/125.
Cruiser
Joined: Jun 2017
Posts: 217
Likes: 116
From: Dallas,tx
hi william I have a very similar setup on my street glide (I have the ventilator intake) I also removed the "restrictor plates" are you still using the power vision? where you able to get a good map? I got a map from fuel moto but it has quite a bit of decel pop.
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Grand HDF Member
Joined: Jun 2017
Posts: 4,683
Likes: 3,977
From: Near Yosemite
So when I had the Dealership install my Stage IV, the tech of course ran a dyno on it. Although he didn't say much about it and I wasn't really all that impressed, I figured it was what it was..... 118 hp and 112 tq. The next time I was in the dealership, he came up to me and asked if he could put my bike back on the dyno cause he wanted to try something different this time. He came back with a tune sheet showing 120 hp and 117 tq. What he said, and showed me on the sheets, was that the mph cutout in the EMC would shut the bike down too early at 6000 rpm. What he did was disconnect the transmission sending unit so the EMC didn't really know how fast the bike was going so it shut down on the rev limiter at 6250, not speed. Made a bit of difference for sure but on the super slab, it still shuts down on mph cutout, sooooooo.......
SE Stage IV Kit
SE Pro Street Tuner
RC Components 4.5" Slip-ons
SE Stage IV Kit
SE Pro Street Tuner
RC Components 4.5" Slip-ons
Last edited by MotoJockey; Jun 15, 2017 at 11:29 PM.
Intermediate
Joined: Jan 2017
Posts: 27
Likes: 15
From: Oshkosh
Mine was all done on the screaming eagle tuner, I have a power vision with a fuel moto map but haven't flashed it yet to keep warranty in tact. I simple use the power vision to monitor temps and spark retard.