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Got a pre-production model you want me to demo/critique?
I am working out the VE calculations now but the link in the first post is the latest version. Whenever I upload an update it will be reflected in the website at the link. I have updated it several times since the original post. In fact if you have any specific heads, cams, turbos, etc.... you would like to see in the libraries just let me know. The desktop version allows you to create your own library entries. The cool thing here is you can populate the timing table and VE tables with your actual tune data and run scenarios. It will also calculate a VE table and MBT table for selected engine components. The MBT table is theoretical optimum timing and will in all likelihood result in detonation in the real world due to temp fluctuations, fuel chemistry fluctuations, and a thousand other things. What it is useful for is to get the timing curve, you can copy the MBT table to the timing table and lower the timing where torque and rpm rise to safe values, then dyno or track tune from there. The calculated VE table also provides a map which can be a good real world starting point for tuning in the AFR, but obviously will require modification for each real application due to injectors, real air flow, etc....
I'm a software architect. Looks very impressive so far and I'm interested in playing with this. Is there a way we can add a turbocharger that's not in your list?
I'm a software architect. Looks very impressive so far and I'm interested in playing with this. Is there a way we can add a turbocharger that's not in your list?
The desktop version will allow users to add any head, cam, turbo, supercharger, etc.... If you want it on the Web app just let me know which ones.
The desktop version will allow users to add any head, cam, turbo, supercharger, etc.... If you want it on the Web app just let me know which ones.
Maybe a few of the popular VSRacing turbos (7875 etc.). Since you're asking for feedback, what would it take to match the desktop features on the web version? I think you'd get the best adoption if a user could enter their exact combo of parts and do the performance modeling. If any one part is not in the list of pre-determined parts they'll probably give up.
Maybe a few of the popular VSRacing turbos (7875 etc.). Since you're asking for feedback, what would it take to match the desktop features on the web version? I think you'd get the best adoption if a user could enter their exact combo of parts and do the performance modeling. If any one part is not in the list of pre-determined parts they'll probably give up.
The problem with letting anyone add to the libraries on the Web is that the build in libraries could explode in size with redundant and probably junk data. Plus we would get trollers who would put in bogus values to be funny. As it is you can edit values and save your session as a project file then reload it when you return to the site.
I pushed another release to the site which has improved VE, power, and torque calculations. I am adding the requested cams, heads, turbos, but on the cams if there is not an available cam card I have to back into the valve events which are a guess to get the duration and LSA numbers to match.
Last edited by pblawler; Apr 23, 2026 at 11:43 AM.
The problem with letting anyone add to the libraries on the Web is that the build in libraries could explode in size with redundant and probably junk data. Plus we would get trollers who would put in bogus values to be funny. As it is you can edit values and save your session as a project file then reload it when you return to the site.
I pushed another release to the site which has improved VE, power, and torque calculations. I am adding the requested cams, heads, turbos, but on the cams if there is not an available cam card I have to back into the valve events which are a guess to get the duration and LSA numbers to match.
I see you're already allowing all the values to be editable, and also have "custom" as an option for most things. That works. Thinking of the turbo crowd, a lot of people use ebay turbos without published efficiency/flow data. Is there a way to do a "basic inputs" version including only the available info like wheel sizes and a/r, and have it estimate the rest?
I see you're already allowing all the values to be editable, and also have "custom" as an option for most things. That works. Thinking of the turbo crowd, a lot of people use ebay turbos without published efficiency/flow data. Is there a way to do a "basic inputs" version including only the available info like wheel sizes and a/r, and have it estimate the rest?
Unfortunately without the compressor map and other data it is just a guess. I will add as many as I can and get close to requests. Like the one above, VSracing does not provide detailed info so I am approximating it from a similar Garrett G42 series turbos that match wheel sizes etc.... I'll post an update later today with additional libraries and updated calculations.
I added 12 VS racing turbos, keep the comments and requests coming. I don't mind negative feedback, or letting me know about bugs, etc..... Its the only way to improve it. I have to do something while I save money to build the car LOL
I am working on some other apps to include calculating Safety grids for Holley EFI, 4 Link suspension setup and simulation, etc.......... One of these years I'll get this stuff done lol
Last edited by pblawler; Apr 23, 2026 at 04:09 PM.
Nice: 5.3 Liter, VSR78/75 into Truck manifold, TruckNorris cam, 706 Heads: We Will SIMULATE !
14 degrees timing at 15 PSI manifold pressure and 800 HP, Very cool.
Thank you for sharing your project here.
Last edited by Full Power; Apr 23, 2026 at 07:58 PM.
Reason: Turbo
Nice: 5.3 Liter, VSR78/75 into Truck manifold, TruckNorris cam, 706 Heads: We Will SIMULATE !
14 degrees timing at 15 PSI manifold pressure and 800 HP, Very cool.
Thank you for sharing your project here.
You can edit the fields like bore, stroke, rod length, etc
.. if you want to test 6.0, 5.7, 6.2, or a bbc 582. It also has the option to save the settings locally or load a saved file. Can literally sim an unlimited number of combos and engines. One thing to note is to recalculate the VE table when switching from NA to a power adder or changing power adders or going back to NA. It all affects VE which affects other calculations. Turbo Sim maps for surge and choke coming soon as well as supercharger boost maps
This is really cool stuff - nice work! I'll try and make some time to do some testing. I hope you have a plan to monetize this somehow when you get a release candidate ready. I would love to see the 4-link simulator as well. I'll be 4-linking both the front and rear of my K5 blazer project and although I've built them before it sure would be cool to play with a simulator.
If you could input head flow numbers that would make it easier for those of use using factory CNC ported heads?
Yeah you can manually adjust the flow numbers and enter as few or as many lift points as you like. You can also save off your setting. The VE calcs are off at the moment but I'll get them fixed soon.
I'll admit, when i first saw this, i thought it was going to be a low effort, simple empirical model, but it appears to be more than that.
It looks like when solving for VE you are using some empirical equations with a helmholz equation. Im not sure what your background is, but have you considered trying to actually solve the 1D wave equation in the intake runner to get a true 1st principles physics prediction of VE? I feel this is what separates the Desktop Dyno softwares of the world from real, full physics based engineering tools like GT-Power. No doubt this would slow the simulation down, and is not trivial to implement, but I'm curious what your end goal is.
Last edited by FSAE_Junkie; Apr 25, 2026 at 12:46 AM.
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Working on an Engine Simulator 
