Long story short, I built two nearly identical engines one engine went in a car and the other is on an engine dyno. The engines are 1.3L and only develop 63HP. This is a gas mileage project
The car engine has 50K miles since a full rebuild. The engine runs great and shows 215 PSI compression. This engine has a .020 shaved head, cast iron exhaust manifold and custom coil pack ignition. The custom coil pack ignition uses a separate circuit board and megasquirt thinks it is a conventional distributor. The spark plugs look great and there doesn't appear to be any ignition trouble. Perfect idle, plenty of power, no issues.
The dyno engine has 180K miles, it was disassembled, cleaned and reassembled. The only new parts were gaskets. Compression is 190 PSI This engine has a .010 shaved head, tubular exhaust manifold and a conventional distributor ignition. Perfect idle, makes power, no identifiable issues yet.
Aside from a few minor details the engines are nearly identical.
If I take the Megasquirt out of the car and plug it into the dyno, the VE tables need to be changed drastically. For example, the cells in the idle area are typically about 25 on the car but the on the dyno these cells would be closer to 20.
The dyno isn't fully operational yet, but I discovered the VE numbers are lower on the dyno engine on a few loads I ran.
The only thing I change when I swap the megasquirt to the dyno is the TPS calibration.
I can pull the MSQ from the car, but I'll need to run the megasquirt on the dyno again to generate the different VE table.
What would make the VE numbers different? Should I be concerned?
VE tables need to be changed when I move MS from car to Dyno
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.