Thread: horsepower torque

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Originally Posted by viking

O.K. next dyno sim with the "cheap" (sorry Mr.Gasket) software, the changes were displacement dropped to "327" and lift to "447" all other fields, Heads, comp, induction and exhaust were left alone.

Notice the Vol eff goes up (as does the HP ), this leads most to believe that these heads are flowing better with this smaller displacement (I believe these heads were designed for a 327) than they are with the 383, with out a doubt the 383 would benefit greatly from better flowing heads.(which can be compared with this software along with all other paramators)

The 383 of course wins the torque war in this sim and seat of the pants real world feeling.

When I post these sim generated graphs it is to pass alone the best info I can come up, use it how you will, or mock it as you may.

This is great coming from a guy that thinks I gave him "mis -information "about a 400 sbc.
A dyno sim is a tool and it won't work correctly un-less you have all the correct imformation and even then it will give questionable results.
I will take my dyno or flowbench or lap times or E.T's any day over a "sim".
There is a reason they call it a "simulation".

Originally Posted by erik erikson

This is great coming from a guy that thinks I gave him "mis -information "about a 400 sbc.
A dyno sim is a tool and it won't work correctly un-less you have all the correct imformation and even then it will give questionable results.
I will take my dyno or flowbench or lap times or E.T's any day over a "sim".
There is a reason they call it a "simulation".

I agree 1000% with you, but since I don't own a dyno or flowbench yet (come on lottery) and can't afford to swap real world parts at will and head out to the track, I figure the sim method is my best bet to make a educated guess at which mods will add the best bang for the buck.

As for the 400's, maybe I've just had better luck with them than most (no over heating issues) , or maybe I have'nt pushed em hard enough to blow one yet, all I can say is on mild hop up's they allways beat the 350's built the same way.

Originally Posted by viking

I agree 1000% with you, but since I don't own a dyno or flowbench yet (come on lottery) and can't afford to swap real world parts at will and head out to the track, I figure the sim method is my best bet to make a educated guess at which mods will add the best bang for the buck.

As for the 400's, maybe I've just had better luck with them than most (no over heating issues) , or maybe I have'nt pushed em hard enough to blow one yet, all I can say is on mild hop up's they allways beat the 350's built the same way.

I will agree with what you said on mild hop ups due to the 4.125 bore x the 3.75 stroke.

I agree with the above the virtual dynos will never get a exact value like a true dyno run, but they have their advantages. I simulated the whole engine in under five minutes to get a good approximation of power output.

I have put hundreds of engines on a real dynos (SF-800 and SF-901) and it takes hours to get the engine bolted up, started and the run-in. And that doesn't even count the time (and $$$) to change out parts. I can do all this in minutes on a virtual dyno.

With your combo, the hydraulic camshaft and 650 cfm carb will keep you from crossing the 400hp mark. I was not sure of your lobe seperation, I guessed 108 degrees.

Pretty large bore there, 406.7ci

Erik, when I type in my ZZ502/502 (unported, stock cam) it matches real darn close.

My useage has revealed to me that the (even baseline) sims these days ain't that bad. In general I would say within 5%-10% across the board. In most cases less than 5% error from reality.

Physics is just physiscs after all ......................

Kitz

Put a set of the new AFR 195 heads and a 750 cfm carb on it and watch it light up! Gobs of power made with a small cam.