I'm sure there are people here that use this program. I really need the parameters for the LT1 stock intake manifold. i.e. flow coefficient, runner length, port diameter, is the runner tapered etc.

Any other info would be much appreciated. I also would like to know how to input xe/xfi lobes or rather where I can find .200 lift and max lobe lift etc. I have v3.3 pro

 

The runner length is 3",no taper and I don't have one to measure.
Ya can do all the lift stuff in the cam section by clicking the CAL button.Ya can also inter your cam card figures manually and save it to library.
Ya need to read the book that comes with it to get better idea of how the program works. Ya DON'T learn how to use it overnight.
Having built a bunch of engines in the past 40yrs it took me about 4 weeks to catch on to the ins and outs of the program. But then I NEVER touched a computer until 3 years ago and have now built two.

 

thanks. I the only thing I am unsure about is the flow coefficient and the size of the port.

Also, would I input the max flow at the most restrictive point (i.e. maf) or at the throttlebody? I was thinking flow through the maf would be more accurate. I don't have the manual unfortunately. What should I set the rpm per second for the calculations (i.e. 300 rpmps)? I notice that changing this produces different results.

 

If ya go into the HEAD section it will say flow numbers. Enter the .100-.700 flow numbers at 28 and it will give ya the flow coefficient of the port.
Did ya get a manual with it? If not ya need to go click ALL the buttons and see what they are hiding.
RPM's at 600
Enter the TB flow rate in the INTAKE section.
Ya will HAVE to KNOW the port size.
There are a LOT more inputs than ya think to be accurate.
This ain't Desktop Dyno. If ALL the inputs are not correct ya will get bogus info. Garbage in-Garbage out.

 

the nice thing about it is that when you get the version with all the bells and whistles it comes with a lot of examples as far as heads/cams go, but as far as the complexity it is worlds above Desktop Dyno. You're able to have control over every aspect of the simulation but that control is a double-edged sword read the help file, even if you kinda know what you're doing. i'm sure you'll pick up a thing or two.

 

Thanks. The above questions were for the intake Manifold not the head. I just wasn't sure if the diameter of the head intake port was the same size as the one on the intake manifold (gasket matching etc.). I guess that you are saying the manifold port is the same diameter as the head intake port? I also have to manually enter the flow coefficient number for the manifold flow. I guessed 2 but have not found any way to get this number without knowing what the manifold flows. If you have the program you can see under the manifold options it asks for flow coefficient. My results are on par with other setups I have run with the intake specs I used which was 3" runner length and 750cfm for the stock throttlebody with 2 flow coefficient. Everything else is accurate.

 

[QUOTE=RRR]Thanks. The above questions were for the intake Manifold not the head. I just wasn't sure if the diameter of the head intake port was the same size as the one on the intake manifold (gasket matching etc.). I guess that you are saying the manifold port is the same diameter as the head intake port? I also have to manually enter the flow coefficient number for the manifold flow. I guessed 2 but have not found any way to get this number without knowing what the manifold flows. If you have the program you can see under the manifold options it asks for flow coefficient. My results are on par with other setups I have run with the intake specs I used which was 3" runner length and 750cfm for the stock throttlebody with 2 flow coefficient. Everything else is accurate.[/QUOTE \]


When ya enter the flow numbers for the heads it will give ya the flow coeficent in the far right hand column.Ya are out to lunch if ya don't have the head flow numbers.Ya need to deduct at least 12%(stock intake) from the head flow when the intake is bolted on.

Use your HEAD FLOW numbers in the flow table. Ya have to figure what the flow is with the intake bolted to the heads. The runner efficiency has to be figured along with the size and length.

DO you have a demo or version that has not been unlocked?