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I had a recent project over the weekend that was a great example of using a dyno to show the value of upgrades and tuning. A customer brought in a 68 Chevy Chevelle, with a GMPP ZZ502 crate motor. He felt that the car was lethargic and not performing up to specs. We did a baseline run on the Mustang MD-150 chassis dyno and found that it was down about 75hp from advertised. That you will feel! After performing a complete exhaust upgrade replacing factory manifolds with Holley Performance Hooker Headers and a performance exhaust system from Pypes Exhaust, the car made another 70 horsepower! Further tuning of the fuel delivery system picked up another 25 HP for a total gain of 95 HP! The customer was thrilled to say the least! Not only were we able to find the lost power and get the car to make MORE than the advertised rating, but we were also able to demonstrate the value of each step!

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Many EFI systems are marketing as "self-learning" or "self-tuning". While this is technically true, it's also partially true. My experience is primarily based on Holley EFI, which is the market leader in electronic fuel injection.

The "self-tuning" capability they are referring to is the ability to adjust the air/fuel ratio (AFR) while driving and make changes to the base calibration or "map". What they DON'T adjust are things like startup, acceleration, and timing. Most systems have baseline settings or "tunes" that you can load or are selected from a startup wizard. However, if you want these things tuned, you will have to learn to do it yourself or in the case of Holley EFI, reach out to us at Truth Dyno and Performance in Medina, MN and we can take care of it for you!

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Doesn't that new "Carburetor" look sweet?

If you look closely, you'll notice it's not a carburetor at all, it’s the Holley TerminatorX Stealth Throttle Body System. It’s a great way to keep that classic look and get all the benefits of EFI! Guaranteed to fool most car enthusiasts unless they take a real close look! It even uses the same fuel line and pressure gauge setup as an old school Holley “double pumper”

Just because you convert to EFI doesn’t mean you need to have a mess of wires and ditch that classic look!

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Converting from a carburetor to EFI is 100% recommended, and it's not because you might think. There are a lot of reasons to convert, what if I told you that increased power is not one of them?

Wait…WHAT?

Here’s the real reasons to convert and get that “modern car experience”:

  • Instant starting in all conditions
  • No need for extended warmup
  • Air/Fuel (AFR) monitoring and adjustment
  • Data Logging
  • Increased Tunability
  • Increased Efficiency

Read on to learn why!

You may be surprised to learn that in most cases, a perfectly tuned carburetor will make MORE horsepower than EFI. That’s correct! There are several dyno tests online, including one that I did Carb vs Sniper EFI, that prove this. The way a perfectly tuned carburetor mixes the fuel with the air cannot be matched by spraying fuel into the air with electronic fuel injection (EFI). However, there’s more to the story!

Notice I said, “perfectly tuned carburetor”, and that’s the key! How many people can say that their carburetor is perfectly tuned? Probably ZERO. This is because you would have to literally tune it every time there is a major variation in the weather. Where I live in Minnesota, this is like every day!

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