SCARY FAST




A: You like the sound of a "throaty" high performance V8.  You like the idea of a small, lightweight convertible with all the modern convenience features -- but ripping performance that is equal to or even better than most exotic cars. That's why!

Q: How much weight does the V8 conversion (engine, transmission and differential) add to the car?


A: The car maintains very good handling. The Miata loves the V8. On acceleration, the rear end squats and holds firm while the front is still nimble & sensitive. After a short drive, the car quickly becomes predictable. Of course the car can get out of shape fast with too much throttle; too much power is a problem I can live with.  Very driftable!

Q: What is involved in the conversion?

A: The Miata drive train, cooling system and unnecessary parts and wiring are removed. The engine compartment is thoroughly cleaned. Some cutting and welding followed by detail painting of the modifications. The suspension gets a make over along with changing the differential and half-shafts. Modifications to the wiring follow. Newly detailed engine and drive train are installed.  Pre-start engine checklist completed.  Exhaust and air-conditioning shop. Pre-test drive checklist completed. A short drive and initial post-drive inspection completed. 200 miles of city and highway performance driving, final inspection completed and the car is ready for its new life.

A: The V8 Miata’s that have passed California’s strict but straightforward engine change requirements consist of: Stock 5.0 EFI engine with all the original (Ford)  factory emission equipment intact & operating  and the engine being the same year or newer than the project car.

A: The fastest I have driven a "stock" V8 Miata is 150 mph on a closed course. The temperature was 75°, no wind and 800 ft. altitude. The top was down and the car was getting light. I backed out. One of the “Mega Monsters” reported in at 175 mph during the closed course Silver State race in Nevada. The car was supercharged and had around 400 hp. The final drive ratio was 3.27:1. The 5th speed overdrive ratio was .80 The top was up and the car was border line airborne. The driver was Richard Holdner, a photo journalist who has "huevos grande".

Q: What are the basic steps in getting a V8 Monster Miata?

A: Details of conversion and cost agreed in writing.  Getting your Miata to Monster Miata in San Marcos, CA. If needed we can suggest several transport companies that will pamper your car.  50% of the conversion cost is due upon start and the remaining 50% due upon completion.

A: Average knowledge of automotive tools and parts changing. Everything else is in the manual with additional help just a phone call or email away. No fabrication is required

Q: What do I need to send to Monster Miata for the "Do it yourself kit"?

A: Your front K member, a Ford 5.0 oil pan and the rear Miata hubs.

A: Any Ford 289, 302 or 5.0 will work. However the kit is modeled around the Fox bodied 5.0 H.O Mustang EFI engine as these engines have the correct accessory brackets and the best all around performance and convenience.  GM/Chevy engines are not compatible at this time.

Q: What year Miata’s are the best to convert?

Q: What transmissions do you recommend for the conversion?

A: My trans of choice is the Tremec T5 World Class. More useable first gear-2.95:1 as opposed to the stock Mustang 3.35.The stock Mustang T5 works fine but coupled with a 3.27 differential gear you're not in that gear for long. You will find yourself doing 2nd gear starts often which works fine.The Tremec T-56 six speed is another great transmission but a bit overkill for a 2600 pound car. I have one in my shop car. Weighs more and is difficult to get into reverse. I wouldn't recommend it unless you get a good deal or just have to have a six speed. The Tremec TKO series is also good for high HP though I have not heard of a T-5 WC failing on a Monster Miata ever.  Here is some good reading.

Q: Your conversion kit uses a 7.5” Ford differential.  Can I use an an 8.8" Ford differential instead?

A: We have used the 8.8” Ford differential  with good results.  However there are a few differences in that the 8.8” requires a mount to be welded in place.  In addition the 8.8” outboard CV’s  are larger and don’t clear the stock shock mounting location so the 7.5” axles are still used.