CBR600F4i Coffman Shorty Dyno Graph
#1
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#6
Well, look at that pipe. At best it’s just an extension of the collector. Only slightly wider. Besides I ran it with restrictor in. Without it I suspect top end would be slightly better but it’d be obscenely loud. But the dip in the midrange was very noticeable. Very. But it looks very nice on the bike that I’ll give it
#7
Well, look at that pipe. At best it’s just an extension of the collector. Only slightly wider. Besides I ran it with restrictor in. Without it I suspect top end would be slightly better but it’d be obscenely loud. But the dip in the midrange was very noticeable. Very. But it looks very nice on the bike that I’ll give it
#8
Excellent point. Just because a stock F4i is around 95rwhp doesn't mean it makes that much on that particular dyno.
#9
But that won't be with a stock exhaust. I now have a Yoshimura race can and really the setup is basically a stock F4i motor with FX/FY headers, linkpipe and can. So it's not really a stock setup.But I guess a run now should give you decent idea about how much stock is as I don't think an FX header and a race can can magically lift the power band if the base is this bad(assuming coffman didn't lose much, the bike was a pig even before)
Frankly, seat of the pant feel tells you a lot and that dip was really noticeable. You don't need dyno to notice obvious crests/troughs in the power band. Before the coffman I used to have a scorpion stubby exhaust with baffles not removed(with f4i stock header, link pipe etc)and the bike had good meaty midrange. After getting the coffman, the midrange was gone and that dip you see above was very very irritating. I am unsure if it was any better with the noise reducer out as I never tried it.
Wish you a happy new year guys. have a good one!
Last edited by ceebeeaarguy; 12-28-2018 at 01:59 PM.
#10