My Dyno Sheet

flhtpi

.060 Over
Joined
Nov 23, 2009
Messages
200
I had my bike dyno tuned Sat. The A/F ratio looks lean, when we added more fuel the A/F ratio looked better but we lost HP and TQ. We ended up tuning for HP and TQ instead of focusing on the A/F ratio. The graph makes no sense to me, I'm wondering if the dyno had a bad O2 sensor? Comments please.
2007 Rocket Std
1,500 miles
Staintune triple exhaust
Staintune cat delete pipe
Triple K&N's Ru-1770's
GiPro
Secondaries removed
Dobeck Performance electronic jet kit
Powercommander O2 sensor wiring terminator, O2 sensor removed
 
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You can adjust it for specific rpm ranges. We did but when we added more fuel where it looked lean we lost power and torque.
 
Triples, TOR's and a PCIII alone should do better than that (it did for me). I'm not convinced yet that the Dobeck thing is doing what it brags about. Granted I have not spent any time looking into it, but that is primarily due to the fact I am very happy with what TTP (trip/tor/PC) accomplished and have stopped looking for more power. The GiPro and secondaries simply made all that power available in every gear, I give credit to the fuel management and low restriction intake/exhaust for my gains. My school of thought is that you open up the ability of the engine to breathe as much as possible without making too much noise, then dump as much fuel and timing into it as it will handle. Anything past that point requires major mods such as blowers, lightened/stronger engine moving parts and more RPM.
I agree .... there is more there to be had, I'd concentrate on the timing and fuel management.
 
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the first thing you need to do is pull that p.o.s dobeck tuner and toss in the trash i've had them on other bike could not get is tuned right put the pc 3 in got moore hp/tq in my opion the dobeck is junk !!
 
Pig9r, you are right ... but it's the torque numbers that make the R3. Less than 150 is leaving money on the table.
 
I guess I'm in the ball park with my numbers. I wish all the dyno sheets had the A/F ratio. The way I see it I could spend another $500 bucks and gain about 4 hp and 5 torque. Maybe that $150.00 spent on the Dobeck was money well spent. I say maybe and I guess a lot because different dyno's give different numbers. It makes comparing data questionable. I happy for now, next winter I'm going to give Carpenter Racing some business for big HP and Torque. Thanks for all the input guys.
 
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Your power curves are VERY smooth. This is a good thing. It's hard to believe your A/F is so high and so uneven. Lots of dyno tuners screw up the O2 probe (I had one done that read off scale, which it wasn't) - probably not your O2 sensor. Spend <$50 and have it tested somewhere else. I'm sure you'd be surprised how little difference 10 out of 150 ft lbs of peak torque makes. Your next step is buying a PCIII and having it custom tuned ($600+).
 
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