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very impressive thread PowerDubs . one thing that is apparent is that it is a complete impossibility that the torque curve on the Wyvern 4 into 4 exhaust i have on my bike is correct , here is the link = 5th photo
https://www.samurider.com/?p=9192
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I don’t see anything impossible about the curve you posted. What makes you say that?
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(06-26-2018, 01:59 PM)PowerDubs_imp Wrote: I don’t see anything impossible about the curve you posted. What makes you say that?
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how straight up off idle and have that much torque plus the huge HP gain.
I know my bike feels very strong and i cruise around town between 2,000 - 2500 rpm with very good power even two up and we are " Normal Size Americans " ......
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Can’t get too caught up in minutia - scaling and rpm on a dyno aren’t always right.
For example your chart says kg/m. And if both our charts were scaled correctly the tq/hp would intersect at 5252 and the curves would appear a little differently. But the numbers would not change.
Dynos are really best suited for exactly what I am using it for- comparison on the same bike, same dyno as a judge of changes made. Really nothing nothing more than that.
If you are curious what your bike does, instead of a advertisement- I am sure there is a dyno somewhere near you.
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really not concerned and baby my engine , it is what it is .
only had my Model A Truck on a Dyno for tuning
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Dunno, but I love this thread. Looking forward to the final outcome....
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(06-26-2018, 02:42 PM)use2b_imp Wrote: really not concerned and baby my engine , it is what it is .
only had my Model A Truck on a Dyno for tuning
What else is done to the bike other than the exhaust? 100% stock breathing otherwise?
Loosing the cats would really make me want to adjust the fueling. I would think they already blocked the pair system somehow or you should be getting decel popping.
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I follow with great interest what you guys are doing and admire your technical knowhow but I will leave my engine alone as I am very happy with the power/torque for my kind of riding at 68.
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The bike is perfectly fine as it comes from the factory other than a slight low throttle twitch in a parking lot, etc.
I just like playing with engines to see what I can get out of them.
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(06-26-2018, 11:05 PM)PowerDubs_imp Wrote: (06-26-2018, 02:42 PM)use2b_imp Wrote: really not concerned and baby my engine , it is what it is .
only had my Model A Truck on a Dyno for tuning
What else is done to the bike other than the exhaust? 100% stock breathing otherwise?
Loosing the cats would really make me want to adjust the fueling. I would think they already blocked the pair system somehow or you should be getting decel popping.
What else is done to the bike other than the exhaust? 100% stock breathing otherwise?
Loosing the cats would really make me want to adjust the fueling. I would think they already blocked the pair system somehow or you should be getting decel popping.
have no idea what was done to the bike but it starts , idles and runs perfect I see no Cats but has an O2 sensor
