| Re: Engine Dyno Predictions: |
Subject: Re: Engine Dyno Predictions: by BeachBum on 2008/12/27 4:05:06 Wes, I forgot to show you the results of the simulator... thought you might kind of find interesting, and considering the work you guys have done on your dyno testing, probably the least I could do. The below graph shows most data and this is your baseline based upon the information you have provided in previous posts on your set-up when it ran 12.64 @ 107.9 I took that chassis dyno and modified to flywheel and input into the simulator based upon many other known specifications. I assume a shallow stage (12.0") and a few other assumptions. It kicked out numbers that almost exactly hit your timeslip.... I had to modify literally just a couple of small variables to land dead on your timeslip. (This sim is pretty freakn good) A few things you might notice is the timeslip on the bottom left and the run data on the right hand side.... this is what the computer calculates you will run based upon all of the data at the top of the page. You might also notice in the upper right a .92 power factor...... this is because your track conditions were calculated to be taking 8% of your horsepower. (Which I had you at Famoso, which I know is approxmiately 700 ft and you also had said mid 80 weather in a previous post) Sim says you also went 0-60 mph in 4.29 seconds which always cool to know..... thats a hard number if the simulators timeslip actually matches yours...... can't get away from it, its math. One other thing I might mention, torque down low will not be what you say on the chassis dyno.... this is due to your converter torque multiplication and also in part the dyno spike that chassis dynos see on the hit coming off a converter. Your actual torque is considerably lower, but the sim takes all of this into effect with the parameters I have set. [IMG]http://i526.photobucket.com/albums/cc342/tldrane/2-WESBAS.jpg[/IMG] The next dyno graph is with the 395 and AFR cylinder heads and the dyno graph is as per what you guys got the other day. It bears mentioning, this is with the same tight 2200 rpm converter and weather..... While I do not show it, I ran the Dart 200cc Pro-1's dyno graph as well..... which is approxmiately 3 tenths and 3 mph behind the below. [IMG]http://i526.photobucket.com/albums/cc342/tldrane/2-WES395.jpg[/IMG] The last graph I wanted to show you what a good converter will do for your et's, especially on your new set-up.... on your first set-up, considering you had a 5000 rpm motor, you could getaway with a 2200 rpm converter, but on this set-up, its hurting you much more significantly. I only loosened up the converter to 2800 rpm in the below sim.... which is still too tight in my opinion, but its much more respectable. If you notice, this is the "only" difference between the above graph and the below one. Well, thats what 490 HP will do for you..... at least thats what the sim says, and I gotta tell you, through experience, its pretty darn close. I'll also point out, if you optimized everything including the converter/gear and maybe a pound or two, very bottom 11's and even high 10's could be realized. (I've run 11.3 @ 900 ft track with roughly only 430-440 flywheel hp before.... if I had 490 at that time, I probably could have coerced a 10 second et out of it or at least come very close) [IMG]http://i526.photobucket.com/albums/cc342/tldrane/2-WES280.jpg[/IMG] Make what you want out of this stuff..... good luck ! |
