Swaptastic’s LS1 Miata

Nathan Sumner's LS1 Miata

Nathan Sumner has spent his life appreciating automotive performance and while at college decided it was time for his own performance project car. He decided to purchase a 1991 Mazda Miata due to its pedigree of great handing, dependability, and relative low cost of ownership.

The original owner had installed a Flyin’ Miata FM2 Turbo Kit on the 1.8L inline four. But Nathan decided a pushrod V8 in this small car would be much more fun. A Racing Concept’s LS1 swap kit with custom clutch hydraulics, driveshaft and axles was used to swap a 2002 Chevy Camaro LS1 and T56 transmission. Also installed was a Ford 8.8 LSD from 2002 Ford Explorer with 3.55 gears, custom Aluminum Radiator from PRC Inc and Walbro 255 fuel pump with 6AN SS fuel lines and fittings. Currently the Miata is putting 328 horsepower and 355 torque to the rear wheels.

LS1 engine in Miata

Nathan is still learning how to handle such a quick car but has been able to get a 0-60 mph time of 4.75 seconds. The 60-100 mph time of 4.85 seconds is faster then a stock C6 Z06.

The swap added roughly 180lbs to the weight of the car. The Miata weights about 2550 lbs with 3/4 tank of fuel, full interior, no PS, no AC (except for evaporator under dash), both hard and soft tops on and the 6-point roll bar using very accurate Longacre scales. The weight bias is 52.3% in front and 51% on the left side.

Nathan’s website Swaptastic has a great level of information and detail covering the swap. Many builders do not include a price list because they are either scared or did not keep a good record of the costs. But Nathan has a very clear price list for those who might be interested in a swap such as this. The LS1 swap list totaled $9,893. But with the offset of the parts he sold for $4,790, it ended up only costing $5,103.

The engine swap took 3 months of weekend work during his Junior year at Georgia Tech to complete the project. He estimated about 200 hours total. If you had every part and tools needed, it is estimated you can do the swap in only 40 hours.

Since finishing his V8 powered Miata, Nathan has begun working on a LS6 Miata and another LS1 Miata. He might have a second job as Miata swap specialist. Also make sure to check out Nathan’s for sale area.

LS1 Miata

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11 thoughts on “Swaptastic’s LS1 Miata

  1. brian

    Dude your insane it miata can already be hard to control with a supercharged 4 banger. but nice job.

    Reply
  2. zach

    man i envy the wor you have done i have a 93 mx5 im thinkin on a r34 skyline swap u think it will work ok and what u recon for the rear end i know the stok wont hold it

    Reply
    1. Swap1 Post author

      It will work. There have been others that have used a RB motor in a Miata. The RB25 Miata we have talked before here uses a Cadillac CTS rear differential.

      Reply
  3. Mr. Miata

    Good job wasting a good car… With that behemoth you totally ruin the car’s balance, the whole point of a miata as a track machine!

    Reply
  4. ruben

    That is exactly what I want to do on my 92 did you have various mechanics work on your car or one simgle mech? Is there any shops that specify miata swaps like clockwork does to 240′s?

    Reply
  5. mike

    Great build. Hows the traction? You must be running drag radials. And just wondering, how much was ur engine and tranny? Thanks!

    Reply
  6. vinny

    how accurate is the 0-60 time of 4.75 ? because it should be alot faster than that being that its 700lbs+ lighter than the vette and the tranny and rear ratio’s are basically the same, are you have traction issues? 60mph should come in 1st gear if its set up the way you say it is, just curious because i am interest in doing the same setup to mine. by my math it should run to 60 in 4 flat.

    Reply

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