My ’93 was awesome, but it’s time for an NB.
Intentions and the CAR:
This car will be a 99% daily driven street car in San Diego. It must be as simple as possible, have a reasonable ride, and be capable of ludicrous speed. I can live without amenities… no PS or AC, no power anything, no leather, ie, a base model. The ’99 was the last year of the available “optionless” Miata. Starting in ’00, all of that crap I can live without comes standard, so a ’99 is the ticket… plus they are significantly cheaper than even the ‘00’s.
Ideally, my perfect ride would be a ’99, white, base model w/sport package. Also ideally, the car would come with some basic suspension/wheels/safety modifications like sways, shocks, wheels, rollbar. I would like an even 200whp on wastegate, and as close to 300whp as possible on EBC. I value spool and driveability over top-end. I hope to be able to buy everything used and I have the blessing/curse of my Navy timetable… only gonna be here through July and then gone for 6 months. I’d like to get all non-turbo specific items purchased/installed, then buy turbo parts while I’m gone, for an immediate install upon return about this time next year. I don’t know what the budget is yet, but I will be stalking every Miata classified I know of daily, so used parts will be key to keeping the budget down.
silver 15x8” 6UL’s and 225 RS2’s. At an even $1k for this package, I don’t think I can beat it. I figure about 8-10k miles on a set of tires with timely rotations and religious pressure-checking.
my weak area. KYB’s and RB sways served me fine for the life of my ’93, but I never touched the adjustability except for autocross. I will not lower the car, so if springs are suggested, they must be stock ride height. I was thinking of the easy route… Koni’s and RB Sways. I’m all ears for the benefits of control arm bracing, shock tower braces, and other hardware.
Goodridge or similar braided steel lines, Hawk HPS or HPplus, and OEM blanks… probably from Goodwin. Please let me find a car without ABS!
being a tall guy, it has to be one of the “layback” models. I don’t need to worry about hardtop clearance because hardtops are for pussies. The BF Maxx fits the bill.
Either the Godspeed or Mishimoto (still looking for more data on which one is better) and a set of 12” fans, plus a DIY coolant reroute. I may suck it up and get the BEGi stuff, but I kinda want to go with a stealth approach… make it invisible within the engine bay.
You’re gonna love this… full return conversion. M-tuned rail, NA regulator, factory return hardline (from a salvage car), Walbro 190, RX7 550’c. I’ll run NA 1.8 injectors until I get an ECU in there. I know guys out there have made 300whp on 550’s with high duty cycles, but I don’t want to spend the money for RC’s, so we’ll see how far they go.
I’ve heard the stories about NB coils, so I’ll go with a Toyota COPs swap. I went 20k on a single set of Autolite 1-step colder plugs, no brainer there. I’m doing homework now on adjustable cam gears… seems like one on the exhaust cam can show significant torque gains. I’ll stick with OBX.
For 300whp, every bone in my body says ACT-XT, but I have thread after thread of people saying the HD will be enough. I really need to drive the XT to decide if the pedal effort is gonna be a problem. And it’ll be the street-disc, no pucks… no, not even a sprung 6puck.
Torsen of course. For a street car, the 5spd and 3.636 ring&pinion(already have) gives the best (on paper) numbers. I know the power limits of the 5spd are in question, but I managed to get my 6” dif to last 20k boosted miles, so I hope with some good fluid and drivetrain management, I can get the 5-spd to last on the street for a reasonable time. If I’m wrong, 5-spds are $200 each.
The motor will remain stock until I blow it up… then 949 rods, stock ceramic coated pistons, upgraded rings, billet oil-pump gears, mild head-work, ARP hardware, and maybe a fancy intake manifold.
BEGi S4 Mani/DP or hold out for Absurdflow production and ensuing showdown. I’d really like to stick with “production” parts here… not interested in having an exhaust shop “fab up” something. 3” piping all the way should go without saying.
Internal gate, and don't try to convince me otherwise. Here’s the debate: 2560 vs. 2860. I’ve been over the specs and compressor maps several times. I’ve read the threads and I know the 2560 will out spool the 2860, but the bigger turbo has a lot more overhead and it doesn’t generate the heat. Does anybody know of any fitment problems with an S4 and 2860? With a tubular mani and 3” exhaust, I think I can still get the spool I want on the bigger turbo. Talk to me.
Either sandwich plate or tap off the pressure sender? Which is a better option?
CX Racing, big but not crazy and 2.5” piping. I’ll be going around the radiator… with no AC or PS, doesn’t make any sense to go anywhere else. I’m looking for a QUIET BOV. My Bosch unit was flawless but would look out of place on this build. I thought about some sort of silencer setup, but it wouldn’t be as clean as a simple recirc pipe. Need suggestions. No rice!
I know that there are guys who swap a 1.8NA intake mani to get around all the VICS crap. Is there a performance advantage to either manifold and what is the process?
Has anybody ever proven a gain to porting the stock throttle body?
This is the biggest decision. Since I really don’t need this part for a whole year, I’m willing to wait and see what the industry comes up with. Clearly, I’d like a Hydra, but the price hurts. Xede does not have the functionality I want. Perhaps somebody will be selling a PnP MSII setup using all stock sensors by then. I applaud you guys who build your own MS’s, but I’ll stick with buying built ones. There are several promising “import” ECU’s out there, but those companies don’t seem interested in a US marketplace. Right now, I’m buying a Hydra unless MS is turnkey, or somebody wants to give me an import ECU in exchange for guinea-pig’ing.
I am all ears to opinions and suggestions. So now I just need a car. Y’all need to help me find one… and the parts. Let's get to work.
If you read this whole thing, you get to look at one of my favorite Navy photos ever, click HERE!