Here are the numbers Last Update: May 4, 2009 11:01 PM

The Car:

  • 1991 Mazda Miata (orginally silver) with factory hard top with A/C and power steering (which I deleted) with 153000 miles on the chassis.
  • Previous Owner converted it to 1995 M-edition (1.8L engine swap, 1.8l Miata brakes, Merlot Mica paint, tan leather interior including new dash and soft top)
  • Factory R-Package trunk lip spoiler (replaced the Racing Beat trunk spoiler that was on the car when I bought it)

The Aftermarket Goodies:

  • When I bought it it had a Flyin' Miata FM2 Turbo Kit, SS exhaust and sway bars, Racing Beat body kit, 4.1 ratio Torsen limited-slip differential, SSR Spec-A (not the lightweigh Comps) 16x7 wheels with 215/45/16 Toyo T1-R's, Hard Dog 4-point sport roll bar. Below are the changes I have made:
  • Swapped to 15x7 Kosei K1 TS +35mm offset with 225/45 Hankook RS2's in front and 225/50 in the rear
  • Front Flyin' Miata Sway bar (removed rear sway for better corner exit, it puts more power down).
  • Ohlin's PCV adjustable coilovers. Adjust rebound and compression together via "clicky knob" and has adjustable spring perches for height adjustability.
  • Momo Start race seats with G-force 6-point harnesses
  • Hard Dog custom 6-point roll bar. I had them use the rear section of their cage and then increase the size to 1.75x.120in tube and add door bars.
  • Good Win Racing's BBK Kit with Wilwood Smart front pads and Porterfield R4S rear pads. For track days I swap out to Wilwood E compound front pads.
  • Stainless Steel brake lines

The LS1 Swap:

  • Racing Concept's LS1 mounting kit with custom clutch hydraulics, driveshaft and axles
  • 2002 Chevy Camaro Stock LS1, T56 Trans (with hurst shifter), wiring harness, accessories and PCM with 20,000miles when salvaged. I bought it from Cleveland Pick-A-Part.
  • Ford 8.8 LSD from 2002 Ford Explorer with 3.55 gears.
  • Custom Aluminum Radiator from PRC Inc.
  • Walbro 255 fuel pump with 6AN SS fuel lines and fittings.
  • 1999 Chevy Corvette fuel filter/regulator
  • Cyberdyne Speedo
  • Car weighs 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. This was from very accurate Longacre scales.
  • WITH me in the car, it has 52.3% of the weight on the front and 51% wieght on the left. Cross weight is 50.2%

The Perfomance:

  • 328rwhp and 355wtq which equates to about 385hp and 417 lb-ft of torque at the crank.
  • 1/4 mile in 11.5 sec (this is what Dan at Racing Concepts ran with his stock LS1 powered miata on BFG Drag Radials)
  • My old turbo setup dynoed at 225whp/tq and should have ran about at 12.8sec 1/4 mile.

Testing Numbers:

Acceleration:

  • So I used my car clubs Traqmate data acquisition system to get a couple raw numbers.
  • Keep in mind I only have 7/8 throttle as I have not modified the throttle body cam (the pulley the throttle cable wraps around). I look at it as "training wheels" for learning how to drive a ls1 Miata...haha.
  • I need some more practice at launches (only have about 4 in the bag so far).
    My best 0-60mph (very traction/driver limited): 4.75 secs
    My 60-100mph time of 4.85secs best that of the C6 Z06 Road and Track tested (4.9secs 60-100mph). I am quite happy with that as that means I am faster than a Z06 once I get WOT....atleast from a rolling start. :D
  • My peak acceleration g's in 1st gear are 0.799 so far. That's pretty good!
  • mph : seconds
    0-10: 0.875
    10-20: 0.625
    20-30: 0.70
    30-40: 0.65
    40-50: 1.05
    50-60: 0.86
    60-70: 1.15
    70-80: 1.16
    80-90: 1.16
    90-100: 1.375
  • see accompanying data charts:

Handling:

I have brought my car to the Little Tally Track three times now. When I went for the third time on December 29th, 2008, I brought along the Traqmate to gather some data. I was running 225/45/15 Toyo RA-1's and it was a cold (40's) day. I ran the entire track in 4th gear. Below is a number of runs on top of each other, all in the 1:07 to 1:08 lap time range. My personal best at this track is a 1:06 flat. Videos of me driving at this track can be seen on the Complete Video's page. My max lateral G recorded was 1.4 with steady state on the flat turns a little above 1.2g's. My braking was a little soft on these runs as I had too much front brake bias with the very aggressive H compound wilwood front and relatively whimpy Axxis Ultimates in the rear.

Little Tally Velocity vs Accel chart

Below is my friction circle. Ideally, you want to be on the outside edge of a circle connecting your max acceleration forces. For a detailed explaination of the friction circle go here: http://www.bentleypublishers.com/gallery.htm?code=GDBA&galleryId=831

Little Tally Friction Circle Chart

Below is a track map with the accel (>0.01, green), braking (<0.2, red) and coasting (black). Note my braking zones are a tad early and long cause of my brake pad setup that day. Also, people familar with this track will note how early I have to brake because of the speeds I get on the straights.

Braking Zones Little Tally