How many here have used these, and what was your experience? How closely did the simulated hp/tq curves match your real life dyno'd combo?
Ref: https://www.performancetrends.com/

 

...I have seven days left of a free trial of the Pro version and have simulated multiple head combinations, but was mostly curious for feedback on how accurate the relative differences shown could be counted on in real life.

If these programs aren't used frequently by users here, another way I could determine this is if someone had real-life dyno or track results and could share their engine build details w/ me. That way I could run that through the software and see if it matched the real-world results.

 

It works great but you need info to put into it that most people don't know or have access to. It's very detailed. It can also be garbage in garbage out. It's also fairly expensive unless you plan on using it alot. It's not a simple program like the old Dyno what ever it was that was real generic. It takes a long time using it for me to get correct results. Recently built a 461 bbc pump gas engine. Program said it should make 590 @ 5500. 620 at peak. First time it fell short 572 @5500. There was a reason. Lifters pushrods and valve springs stiffened up and then 591@5500 and a touch over 600 on top. This was a pump gas 461 did like 615 Tq. Torque and horsepower peaks at RPM were right on the money. Some of the things you have to know just to give you an idea are port cc port length cfm intake runner length and taper just for starters. This program is a very good educational tool also, as it will teach you how an engine works, what making a cam change does and you can enter anything you want or they have a pretty good list of cams carbs intakes heads but not for Oldsmobile Zero there.

 

Is that Terry F-ing Fritch? Joe still wants his heads. It's only been 18, 19 years!

 

It has a lot of component specs available in a library but it's not a program focused on Olds so there isn't a ton there. It occurred to me that Jerry W has recently done a ton of real world dyno testing w/ a lot of build information, so I tried to put in specs for his baseline build from the first of his published papers.
The program does have Gen1 Edelbrock head specs...and while I understand that that won't be the same as C heads I used them as the starting point and put in as many of the "correct" specs for C heads as I can, including flow numbers. I had to make some assumptions (on CR, etc...) so I know it's not a valid comparison to compare to his numbers but below is what it output. I'd really like to try with some more detailed information if possible.

 

WTF you are a freaking thief....
You took my money for a product you could not produce. You have stolen from me and others. There is a special place in hell for you.
How dare you post about advise when you have STOLEN from myself and others in the Oldsmobile community.
My Phone number is that same as when you took my money. Feel free to give a call and make it right.
ESADMFer.
FU
Edit: I tried to help you after Betsy died and you stuck it in my a$$. A race was held in Muncie to honor your wife and I/we tried to help you. You are truly a POS!

 

if you want to know any specifics I’ll let you know. Just send me an email, jerry@tandjw.com. We have a lot of data and a lot of combinations.

 

I have both Quarter Pro and Engine Pro and enjoy using them.
Patrick Hale was one of the originators in this area, he was an aviation power plant engineer if I remember right as well as a record setting comp eliminator racer.
He did an interview with Don Terrel of Speed talk that was pretty fascinating and wrote a book on how and why he developed each of the inputs as well as the math behind it. Some of it was way over my head, but enjoyed it regardless. Its called the Horsepower chain if I remember right. I'm traveling for work so I cant go look at the bookshelf..

 

My shop has Used Analyser Pro for years. They have a good handle on the facts and worst they have found was AP was 9 hp lower then the actual dyno. This was compared to over 40+ engines everything from mild performance sb to full record-setting class cars like PRO Mod.

But like every computer program, it's only as good as info input. I know my guys have the input parameters down to get a very accurate output. 90% of the engines now don't get dynoed, they run both the drag sym and AP and now k ow what a combo and car will run.

Actual mph is usually within 5mph but it's are right on. One was a smallish nitrous BBc NMCA class car, 460 inch, cast single 1 stage. Head porter WROTE 7.70 on the deck. Everything laughed as that was over 2 tenths faster then the record. 1st race car set record ar 7.81. 2nd race lowered it to 7.709 just like porter said. Another was a 440 duster, sums said 9.70 and car went 9.71.