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[skyhook]

did some tuning today...added open end cap and reduced discs from 28 to 20...the afr went way lean at wot above 4000...we corrected both cylinders to 13.0 (that's what mike cat wanted, I suggested 13.5)...didn't touch timing, I may do that later with the laptop...the man was very busy and I didn't want to hold him up

I'm not presenting this chart as a scientific comparison for the following reasons:  uncorrected numbers, different day, much better conditions today vs oct 2

because the afr went lean, does that mean the pipe flows better with open end cap?...any opinions/experience on whether the supermeg baffle core/collector/headpipes are too small...the best run was 120/120 uncorrected 5th gear dj250 (no tricks)

[AXIL]

  imoh, always start with an open end cap on an 88" or bigger or it cut off higher rpm's.   axil

[sportygordy]

did some tuning today...added open end cap and reduced discs from 28 to 20...the afr went way lean at wot above 4000...we corrected both cylinders to 13.0 (that's what mike cat wanted, I suggested 13.5)...didn't touch timing, I may do that later with the laptop...the man was very busy and I didn't want to hold him up

I'm not presenting this chart as a scientific comparison for the following reasons:  uncorrected numbers, different day, much better conditions today vs oct 2

because the afr went lean, does that mean the pipe flows better with open end cap?...any opinions/experience on whether the supermeg baffle core/collector/headpipes are too small...the best run was 120/120 uncorrected 5th gear dj250 (no tricks)

Lets here a little more about the engine and throttle body 

[skyhook]

'08 fxdse2...110"...stock pistons, cylinders, rings, lifters, clutch, gears...r&r cycles stage 4 heads (ported '06 and later 96" castings...sold the stock heads), 86cc, 1.94/1.63 valves, stock intake runners...se257 cams...030" cometic head gaskets...crane adjustable pushrods...power commander...canned ignition map by mike roland, tweaked by me...horsepower inc 55mm throttle body...screamin' eagle injectors...supermeg exhaust...bobby wood 3.25" air cleaner...200ccp/4% leakdown

[jfh]

Chip was in the 140/140 range running a SuperMeg on his T-Man Jims 120" Frontier.

[Doc 1]

did some tuning today...added open end cap and reduced discs from 28 to 20...the afr went way lean at wot above 4000...we corrected both cylinders to 13.0 (that's what mike cat wanted, I suggested 13.5)...didn't touch timing, I may do that later with the laptop...the man was very busy and I didn't want to hold him up

I'm not presenting this chart as a scientific comparison for the following reasons:  uncorrected numbers, different day, much better conditions today vs oct 2

because the afr went lean, does that mean the pipe flows better with open end cap?...any opinions/experience on whether the supermeg baffle core/collector/headpipes are too small...the best run was 120/120 uncorrected 5th gear dj250 (no tricks)

Yes the AFR  went lean because of more flow through the pipe....the more back pressure the richer it will get.

[skyhook]

man, what a coincidence, doc!... I was just thinking of you, and that I bet your tts could get me that last 10% that my pc3 left behind!