power update

[Skidmarx]

well iv got the bike on the dyno as we speak, using a us base map it just ran 146rwhp, running on a car dyno, going to start editing now

[Skidmarx]

reasonably good result yesterday, being a car dyno power figures are way off, pretty much just used the dyno as an a/f meter, but it did show that there was good improvement, the bike was powering the whole rear seaction of the dyno, 4 very big rollers and twin retarders, starting with 146rwhp on the stock us base tune, wich was very lean through the whole range, added a little timing, removed limiters, and started adding more fuel, by the end of the day we had gained a tad over 10rwhp but around 60nm, torque curve is pretty damn good but still running a touch lean up top, going to put it on a bike dyno in the next week or 2 to get an accurate power figure, but its amazing to ride now, so smooth and torquey, totaly different bike, can pick the front up in 3rd easily, and was spinning the tyre on the dyno at around 200k's an hour

heres a little clip for you all, and ill be posting a dyno sheet from my car dyno very shortly, sorry for the bad quality of vid clips, forgot to take my gopro so had to use laptop webcam

1st run

finale run

the back tyre after 6 runs spinning when hitting 200odd k's

[fullbore busa]

Good result's that is a honest HP figure and what i would expect to see from a gen1 , what makes u think a bike dyno should give a higher HP figure ?


Mark

[Skidmarx]

well i was under the impression that if the bike was powering a roller thats less than an 8th of the rotating mass of the current car dyno i use at work, that it would net a higher result?? i could be completly wrong, iv never run a bike dyno before, all i know is that our dyno reads lower than any other dyno in town

[Maj]

With that much wheelslip i'm not surprised your numbers are down .was it pulled forward off the rear roller and tied down hard
rotating mass is included in the calculations within the dyno software even drag from all the extra parts should be pretty much cancelled out , any correctly calibrated dyno should get the same reading in the same conditions

How much mass is in the rollers ? as an inertia dyno mine weighs 480kg

[Skidmarx]

ahhh ok, ya im not sure off the top of my head what the rotating mass would be, but its a 1500hp awd dyno dynamics, built big and heavy lol

[fullbore busa]

Like Maj the rotating mass is taken care of in dyno software , but the power u are getting if what i have seen most gen1 busa's make peak HP is not important anyway ,the main thing is the gain u have , i have seen some very inflated figures from dyno's before and after tune for instance one in partictular i saw it make normal Hp on one dyno then he had it tuned on another dyno and after tune gained 15HP when it went back on the 1st dyno it hadn't gained anything he wasnt very happy obviously .

Mark

[fasterfaster]

Like Maj the rotating mass is taken care of in dyno software , but the power u are getting if what i have seen most gen1 busa's make peak HP is not important anyway ,the main thing is the gain u have , i have seen some very inflated figures from dyno's before and after tune for instance one in partictular i saw it make normal Hp on one dyno then he had it tuned on another dyno and after tune gained 15HP when it went back on the 1st dyno it hadn't gained anything he wasnt very happy obviously .

Mark

Mmmm I think I know the bike If it's the one I'm thinking where the bike make and owner share the same initial then there is much more to the story being told as there usually is
Aaaah banana land .................. such a friendly little place