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  1. M

    What have you done to your Miata today?

    It's really not that bad. Just SO. MANY. PIECES. You're going to need a couple special tools to completely disassemble and reassemble it. Disassembly is obviously easier but you're going to need a way to pull bearings and clutch hubs off the main and counter shafts. I use a two-jaw puller and...
  2. M

    Lighter = Faster (RX-7 Build #2)

    Ever thought about upgrading to a multi-tooth trigger wheel and variable reluctor or Hall Effect sensor like the ones Full Function Engineering offer? I have no experience running a stock FC-style crank angle sensor on my current setup but all the tuners I know seem to rave about FFE's stuff. I...
  3. M

    Lighter = Faster (RX-7 Build #2)

    So is the issue you don't know what the marks on your pulley are: 0/-10 or -5/-15? I'm pretty sure 0/-10 was the stock target for the older 13Bs. I'm not sure where the -5/-15 would have come from. One solution would be to pick up one of Racing Beats main pulleys to check since they're marked...
  4. M

    Lighter = Faster (RX-7 Build #2)

    Most of my start up adjustments are for fuel. I've got some pretty significant enrichment going on when coolant temperature is below 100F. Haltech also has a "post start enrichment" function I'm using. It's a 3D enrichment map that's dependent on coolant temperature and engine running time. Even...
  5. M

    Lighter = Faster (RX-7 Build #2)

    I thought you wanted the alternator "sense" wire connected to a constant 12V source as far away from the battery as possible. That way it senses the greatest voltage drop and can better regulate it. I have mine connected to the headlight circuit because it was the easiest, closest circuit that...
  6. M

    Lighter = Faster (RX-7 Build #2)

    That's an interesting setup. Is that how Fuelab recommends the install? In mine the line from the pump (with inline filter) runs to the fuel rail, then I have a line from the fuel rail to the FPR, and then the bottom port of the FPR goes back to the fuel tank. Your setup obviously works but I've...
  7. M

    Lighter = Faster (RX-7 Build #2)

    That reminds me; I really need to check my duty cycles at higher engine speeds/loads. What kind of fuel pressure regulator are you using? I assume it's a 1:1 rising rate aftermarket unit. If so, just increase the fuel pressure without the vacuum line to 45 psi and then connect the line. You're...
  8. M

    Lighter = Faster (RX-7 Build #2)

    That fuel pressure seems low to me. Stock FC injectors are 460 cc/min and the fuel pressure regulator uses a vacuum reference with a base pressure of 34-40 psi. I don't know the rate of the regulated pressure relative to its source though. I'd think you're making more power than a stock FC so...
  9. M

    Lighter = Faster (RX-7 Build #2)

    Okay, that's pretty cool. What I have isn't too far off that. I'm targeting a little richer at idle and the low-to-mid range. I can live with that since my engine seems to like runner richer in general. Any above 13.5 or so below 2000 RPM is unstable. Ideally I'll get within +/- 0.1 of my...
  10. M

    Lighter = Faster (RX-7 Build #2)

    I'm running into a couple issues: 1. It almost seems like every time I start the car it wants to run a little differently. I've been trying to be better at doing my tuning around the same time of day in the same kind of weather to avoid atmospheric effects. I essentially started over yesterday...
  11. M

    Lighter = Faster (RX-7 Build #2)

    Ugh, the more I try to tune this thing the more I realize I have no idea what I'm doing...
  12. M

    Lighter = Faster (RX-7 Build #2)

    I've done the unthinkable. I've actually ADDED emissions equipment back in the car. I now have a working PCV system! I'm using the PCV valve and general system structure from a FD RX7. The goal was to reduce the amount of condensation I was getting in the crank case with just a vented catch can...
  13. M

    Non Interference Motor??

    9 year bump?!
  14. M

    Lighter = Faster (RX-7 Build #2)

    I've thought about that. The examples I've been using have been peripherally-ported engines, which only have one intake port per rotor, so my case is slightly different. Unless you have variable-length runners or staged ports there will always be a trade off between low and top end power. It's...
  15. M

    Lighter = Faster (RX-7 Build #2)

    I'm not convinced staged injectors are the result of the quest for more power. Mazda uses smaller injectors overall. Probably for a smooth and stable idle and acceptable fuel economy and emissions. The GSL-SE ran two 680 cc/min injectors. The N/A FC's ran four 460 cc/min injectors. What I could...
  16. M

    Lighter = Faster (RX-7 Build #2)

    I do have a pair of ID725s that came with the FFE primary fuel rail kit. I've been trying to avoid staging, if possible. It's added complexity and I don't think I need it unless I run much smaller injectors all around. The two ID1000s I have right now are capable of the low duty cycles needed...
  17. M

    Lighter = Faster (RX-7 Build #2)

    Very conservative. At WOT it's in the 20's. I figure I've got at least 10-15 degrees of advance to play with. This car should be making 190-200 whp. I just need to find dyno time to work on the timing. It backfires ALL. THE. TIME. I took the car to the Tail of the Dragon this past weekend...
  18. M

    Lighter = Faster (RX-7 Build #2)

    169 hp at 6800 RPM and 135 ft-lb at 6300 RPM. Not bad for what is essentially still a break-in tune with conservative timing.
  19. M

    What have you done to your Miata today?

    I remember seeing that a while back. It jives pretty closely with the recommendations the Mazda FSM gives regarding minimum ambient temperatures: 35% glycol by volume is good to around 0 degrees Fahrenheit. I'm running 33% gycol because it's convenient to mix 1 gal glycol with 2 gal distilled...
  20. M

    What have you done to your Miata today?

    I was just reading the technical information from Redline and they mention it lubricates water pump seals so perhaps the Water Wetter acts in lieu of glycol in that sense.