Cars MX5

Mazda MX5

There is already a buttload of information out there about these cars, pretty much anything you want to know has already been done and documented, often with photographs and videos. Here is my small drop in the ocean.

Focus on first generation NA/Mk1 (1989-1997) unless otherwise specified.

Antenna Delete

• M5x20 stainless button head screw, M5 10x1 mm nylon washer. Needs the manual (non-electronic) antenna
• If you have the electric antenna, take the whole antenna out and use a grommet in the body.

Parts

• Brake Caliper Bleeder, Rear - M8 x 1.0 mm, 34mm long - Good Win Racing
• Brake Caliper Bleeder, Rear - M7 x 1.0 mm, 34mm long - Good Win Racing
• Crush Washer, brakes - ID 10mm, OD 15mm - MX5OX
• Crush Washer, Sump/Gearbox/Diff - ID 18mm, OD 24mm - Mania
• Engine Sump Plug - M14 x 1.5 mm thread
• Engine Oil Cap - M35 x 4.0 mm thread (sometimes called M36)
• Exhaust Manifold Studs (MiataRoadster Kit)
  • Nine M10x1.25, 48mm long, grade 8 studs, yellow zinc
  • Nine M10x1.25 flanged serrated nuts, silver zinc
  • Nine M10 Nord-Lock washers
  • M10x1.25 tap to chase threads (imo use a thread chaser, not a tap)
  • anti-seize for nut end of studs
  • Cotronics Resbond 907TS threadlock
• Sway Bar, Front 19mm - bushing NA01-34-156A (cross-ref BPS, Rockauto)
• Sway Bar, Rear 12mm - bushing FB01-28-156 (cross-ref BPS)
• Frankenstein cover side screw - M4 10mm countersunk
• Soft top / hard top screws, class 10.9 flanged black zinc oxide
  • Latch - Original M6 ~18mm with JIS+3 head (Warning: do not use Phillips)
  • M6 20mm - Wurth AU, McMaster USA
  • Striker - Original M8 20mm with Torx T40 head
  • M8 20mm - Wurth AU, McMaster USA
• Radiator Fan Switch (front of motor) - Tridon TFS114
• Rear upper mudflap clip - NA12-51-876A (huge thanks to IL Motorsport)

Springs

• https://www.norwestsuspension.com/convert-spring-rates

Name	Front Rate & Height	Rear Rate & Height	Source
Flyin Miata (old rear bind)	342 lbf / 6.12 kgf	228 lbf / 4.08 kgf	Fatcat
Flyin Miata (2006 redesign)	318 lbf / 5.69 kgf	233 lbf / 4.17 kgf	Fatcat, FM
H&R Race	240-270 lbf / 4.30-4.83 kgf -38mm	220-260 lbf / 3.94-4.66 kgf -38mm	Good Win Racing
H&R Sport 29839-1	257 lbf / 4.59 kgf -35-40mm	211 lbf / 3.77 kgf -35-40mm	OzRacer, H&R Email rates: 45 N/mm 37 N/mm
Tein S-Tech	235 lbf / 4.21 kgf -19mm	168 lbf / 3.01 kgf -29 mm	Fab9, Tein
Espelir Super Downsus ESM-058	213 lbf / 3.8 kgf -32-37 mm	179 lb / 3.2 kgf -27-32 mm	RHDJapan
King Springs (KMFL-52 front, KMRL-53 rear)	165-215 lbf / 2.96-3.85 kgf -30mm	105-160 lbf / 1.88-2.86 kgf -30mm
RSR Down Series M020D	196 lbf / 3.5 kgf -30-35 mm	140 lbf / 2.5 kgf -15-25 mm	RHDJapan
Eibach E5517-140 Kit (F5517001 front, F5517002 rear)	191.28 lbf / 3.42 kgf -25-30mm	114.2 lbf / 2.04 kgf -25-30mm	Eibach, Mania Email rates: 33.5 N/mm 20 N/mm
Pedders Low (2332 front, 2333 rear)	189.2 lbf / 3.39 kgf -25mm	167.2 lbf / 2.99 kgf -25mm
Pedders Std Height (7332 front, 7333 rear)	187 lbf / 3.35 kgf	99 lbf / 1.77 kgf
Racing Beat Street	157 lbf / 2.81 kgf -8.5mm	106 lbf / 1.90 kgf -25mm	Good Win Racing
Mazda (Showa) 91-93 LE and R-pkg 93-96	154 lbf / 2.75 kgf	97 lbf / 1.74 kgf	Fatcat

Could not find rates for:

• Anything listed at DC, all seem discontinued? https://www.dcperformance.co.uk/performance/mazda/mx5.html
• Apex APX-100-4000 (-30 mm)
• Cobra CO4620 (-30mm)
• Spax S022022 (-30mm)
• V-Maxx 35 MA 08 (-30 mm) - V-Maxx
• V-Maxx 35 MA 05 (-45-50mm) - V-Maxx
• etc...

5X Racing DIY Bilstein

https://5xracing.com/pt-3308-miata-spring-rate-guide.html

Name	Front Rate	Rear Rate
Street Touring	350 lbf / 6.25 kgf	275 lbf / 4.91 kgf
Sport Touring	400 lbf / 7.14 kgf	325 lbf / 5.80 kgf
Dual Purpose	450 lbf / 8.04 kgf	375 lbf / 6.70 kgf
Track Day	550 lbf / 9.82 kgf	400 lbf / 7.14 kgf
Race	600 lbf 10.71 kgf	450 lbf / 8.04 kgf