Dyno Tune Results

[GrumpyShamurai]

Well had the tr650 and my fz1 tunes by Nels at 2 wheel dynoworks. Man they feel like 2 new machines. Tr650 has gpr single exhaust, and the foam filter mod, with a PCV. Smooth revs from idle on up to redline. The bikes 'rev limiter' is some kind of change to the fuel map to prevent a hard redline he was explaining to me. Or something like that lol. You can see the drop off at the end of the chart. My original tune was terrible and it was obvious watching the afr line on the first few runs. Here are the results.

 

[mag00]

What did he tune for? With a pcv you should be pulling more power than that, heck, with just the eruption I have a pony more with my baffle removed.

 

[GrumpyShamurai]

Tuned for smoothness look at the difference in our AFR lines, and the actual lines yours is very jumpy and even looks to cut out in spots. Also yours is SAE mine is STD.

 

[mag00]

I think you detuned your bike. Sae is considered more accurate and STD inflates the readings. I think you need to add some fuel on the top end for your engines health.

"STD is Another power correction standard determined by the SAE. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."

http://www.corvetteforum.com/forums...383196-dyno-sheets-sae-vs-std-correction.html

My bike don't cut out or anything, runs strong, and this was before the Multispark plugs if I remember right. After the plug install it is even better. This dyno run was to see the difference with the eruption vs not having it. I run a home made single can system.

Thanks for posting it up, it is good to see how different fueling conditions affect the performance.

 

[Roger 04 RT]

Guys,
Some food for thought ...

Just a note to your otherwise good looking dyno charts. At the start of a well set-up test run, since your bike is in gear, with the wheel at a steady speed and engine around 2000 rpm, the AFR should read 14.7:1. Your bike at a constant speed with a small throttle opening is in closed loop mode, or at least it should be.

If on the other hand the bike's rear wheel decelerated just prior to the recorded pull, it indeed might be very lean. But then the power numbers for a few seconds aren't accurate due to false leanness. Unfortunately a few seconds is half the dyno run.

The first 10 seconds of the chart below is the shape of AFR for a good "pull" made on the street in 4th gear from 1800 rpm to about 6500 rpm. In my case the baseline AFR is 13.8:1 because I run a non-stock O2 sensor.

 

[O.e.hansson]

Heres mine, with custom exhaust and airfilter. As mentioned above the tr650 cuts out at about 7200rpm making it run to rich as a built in safety or whatever you call it. You can see it on the air/fuel.