C7’s Remote Tune Blows Engine

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When Adding Compression and Meth Injection, the Best Tune Is Done in Person

Tuning is a big part of our hobby, and the venerable LT and LS engines make it all-too tempting to extract big horsepower numbers. With any modification, there’s a right and a wrong way to do it, both with the components and with either a dyno or remote tune. Sadly, for Corvette Forum member bgautreau, he found out that there’s a way for things to go wrong in more ways than one.

Multiple things are going on here, so we’ll start with the dyno pull. Rarely do you see pulls this long, which leads us to believe it was done in the wrong gear. Which makes the pull quite painful to watch.

CHECK OUT: What Forum Members Are Saying About This Doomed Dyno Run

Next we have to look at the modifications done to this car. A supercharger and meth injection kit are added, but really don’t contribute to the failure of the engine. If we have anything to go by in this video, the car was making roughly 530 horsepower at the wheels. That’s a pretty common number to safely rely on stock internals. So whats the deal? We suspect it’s the remote tune.

As one member commented, the injector windows on the LT engines are far different from the LS engines. When you try to add more fuel to compensate for compression, the fuel doesn’t atomize correctly, pools, and ultimately doesn’t ignite, causing detonation. However, the un-burnt fuel makes the car read rich. That, we believe, all comes down to the remote tune, and the issues on the dyno could have been addressed by having a proper tune in person, at least for this application. We hope this C7 comes back better, faster, and stronger.

Patrick Morgan is an instructor at Chicago's Autobahn Country Club and contributes to a number of Auto sites, including MB World and 6SpeedOnline.

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