How to finish a V6 swap into a Miata: wiring, fuel, exhaust and more | Project Endurance Race Miata

Story by Tom Suddard and Wayne Presley

Thanks to a freshly painted interior and two sets of new Konigs and tires on the shelf, our LFX-swapped, NA-chassis Miata endurance racer was getting closer and closer to the track.

One problem: We hadn’t yet heard it run–well, not since swapping in the V6.

We’d finish this final phase of the swap …

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Funny but adding the drivetrain loss to the chassis dyno numbers comes out to 323 horsepower.

What will you do with the dead motor?  I would rebuild it as the primary engine and keep the Copart motor as the spare.

In reply to Jerry From LA :

How did you determine drivetrain loss? It's neither a percentage nor a fixed value, but a combination. It's 281 measured RWHP, that's the one number that's reliable - and applicable. 

This update reads like real life meeting forum lore :) The engines are cheap, until they're not. The wiring is easy, until it's not. The parts bolt in, until they don't. This is what it's really like :)

Keith Tanner said:

In reply to Jerry From LA :

 

This update reads like real life meeting forum lore :) The engines are cheap, until they're not. The wiring is easy, until it's not. The parts bolt in, until they don't. This is what it's really like :)

I think I am going to print and post that on my shop wall because it describes every single project that has ever found its way into my shop. 

Being the owner of an LFX powered 1966 Chevelle, I went through almost all of these issues. I used the factory harness and fab'd just about everything else. 

You do know they make a twin turbo version of that engine don't you?

I've driven several and it do make me smile!