1349cc project

[fj1289]

There ain't a whole lot of Miata left in that thing!  Pretty much full on race car 

[RPM - Robert]

Chris, the unibody and chassis are all miata along with all the suspension pickups points and geometry. The drivetrain is the only swapped parts.


Pat, we put some over fenders on it and stuffed an 11 inch Hoosier A7 in there. Not many tire options in a 15" tire. Going to an 18 would require extensive cutting of the back.

Car is down to 2100lbs with 4 gallons oil and 8 gallons of fuel. No driver.  52% front and 50% cross weight

[Pat Conlon]

750hp/2,100 = 2.8 lbs per hp....normally aspirated, dead nuts reliable, that's gonna be a handful, and a hoot.
 

Now....Back to your regularly scheduled program.

[fj1289]

Chris, the unibody and chassis are all miata along with all the suspension pickups points and geometry. The drivetrain is the only swapped parts.

Sweet!  I thought it had been front and back halfed. 

Be cool to see it run in anger!

[RPM - Robert]

Chris, the unibody and chassis are all miata along with all the suspension pickups points and geometry. The drivetrain is the only swapped parts.

Sweet!  I thought it had been front and back halfed. 

Be cool to see it run in anger!

Nope just sheet metal cut away and tubing added to beef everything up. The old car the front end would sag when you jacked it up. So adding all the extra tubing was necessary to make it a bit more rigid.

We also used 1.75" tubing instead of 1.5" for safety/speed reasons. The weight of the car we could "legally" use 1.5" but peace of mind is worth its weight in gold sometimes.

[Pat Conlon]

We also used 1.75" tubing instead of 1.5" for safety/speed reasons. The weight of the car we could "legally" use 1.5" but peace of mind is worth its weight in gold sometimes.

Robert, don't forget your front and back hubs. Front wheel bearing failures are common on track Miata's
https://www.miatahubs.com/product-page/na-nb-miata-front-enduro-hubs

[fj1289]

Nicely done!

Fully agree - a tad extra weight is worth the extra strength and rigidity. 

[RPM - Robert]

We also used 1.75" tubing instead of 1.5" for safety/speed reasons. The weight of the car we could "legally" use 1.5" but peace of mind is worth its weight in gold sometimes.

Robert, don't forget your front and back hubs. Front wheel bearing failures are common on track Miata's
https://www.miatahubs.com/product-page/na-nb-miata-front-enduro-hubs

Ryan's friend runs a small business called bro-fab.com we have been using his hubs for several years with no issues. However, with the g forces we are pulling we check them after every event when doing our nut and bolt. AIM data shows lateral g a touch above 3 and inline under braking around 1.5 deceleration is around acecel .7 g

[Pat Conlon]

A 3g lateral load is impressive.
Makes my pencil neck ache just thinking about it.

When you get a chance, post some progress pictures for us.

[RPM - Robert]

Here is an in car from this Saturday. On old tires but still putting down a pretty good lap. For comparison the nascar cup series last qualified the full track in 2019. Kyle Larson was on pole with a 1:34.598. Ryan ran a 1:35.02 on work out tires. The SCCA spec Miata record is a 1:54.933

https://youtu.be/AZzVuzMgE-Q?si=eZ0ZtQw_UopqmKPs

[fj1289]

THAT's what splitters are for!   

[FJ1200W]

I've been intrigued by the watercooled blocks, especially since I've noticed quite a few electric water pumps being used in other similar applications.
interesting!