Brad The Bike Boy: A dyno comparison

Sunday, November 6, 2011

A dyno comparison

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I took the chance last week to take Minnie to Dynobike to get a feel for how the new dyno compared to the old dyno. Filled with fresh fuel and running the Megacycle slip ons and ignition map loaded into the TCIP4 to replicate a previous run, the result surprised me and made me a little more pleased with some other things I'd run on this new dyno previously.

Dave thought there would be a 5% or so difference, but the graph below shows the two runs - blue is old Dynojet 200, red is Dynojet 250i. I exported the data into a spreadhseet and it's an average 13.2% difference - varying from 10% under 3,000 rpm to 15% in places. Given the Dynojet is an acceleration dyno the variation may vary with the specific power level of the bike being tested, but I don't have anything else at hand that was run on the old dyno to really know.

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The 851

The 400SS

I bought this 400SS (genuine 93 model Australian delivery! Woo hoo huh.) after seeing it in Ebay for what was possibly an good price. As ever, good was too good to be true. Badly repaired and rusted out fuel tank, badly repainted side panels, lots of km (83,000 of the bastards), etc. You know, the usual. Purchased in October 2012, as of now (Jan 2014) I've nearly finished a major service. The cam timing is done with some of the Madasl adjustable pullies that have been drilled in 4 different settings for easy dyno testing. And I have some 900 headers to try a 40mm dual exhaust set up on it (ala M400). Not a great deal of progress for 15 months, so it's taking on a long term feel. There's an F1 endurance style seat base (more taper at the rear) and front fairing sitting around, which will require frame mods to fit. It's a bit of a mental sticking point as this time. But hey, it's not like I can devalue it much more.

The Mighty KR1S 250

How it looked the rainy night someone came to take it away. Painted all black when I bought it, at some point later I realised i could rub the black off and have much of the original colour scheme underneath. Although the main fairing was originally from a red KR1 I think, and definitely badly repaired more than once, so it stayed black. And the tail panel shown was bought to replace the one I smashed the only time I crashed it and the last time I rode it at a Sandown track day. A sensational little bike, holed pistons and frequently failing stator windings aside. The first bike I rode on a race track and the first bike I had my knee down on. And a great commuter too I found. It's sometimes nice to have a bike that won't wheelie past the city speed limit in first gear.