you killed it

It's still going strong. I'm out of town on an internship, but the rest of our guys are still working on the car. Got the driveshaft sorted out (less than an hour in a machine shop to make a Nissan driveshaft safely mount to a Mazda differential!) and they're starting on the exhaust manifold.

This is a great build, I love stuff like this. In for more progress pics.

So I had a thought. I'd love to reuse the stock tachometer. But I need some help.

The stock Miata gets a 12V (I think?) signal twice every revolution. I believe the Z31 ignitor puts out a 5V signal, because I've seen people mention a 1k Ohm resistor as a 12V pull up when using Megasquirt.

In short, halp. I don't know exactly where I need to go from here.

https://www.miataturbo.net/attachmen...ine=1314941284

"Feed me a small child."

https://www.miataturbo.net/attachmen...ine=1316586357

So we've got the bodywork done, and tried out the new stance with 225/45/15s on the front instead of the 275/35/15s. Aesthetically, it's much better, and dynamically it should help us get our goal of steady-state mild understeer with power-on oversteer.

Yes, that's the exhaust outlet in front of the front left tire. We're going to surround it with a stainless steel plate, that's just the rough cut in the bumper.

you'll be happier with equal tires and adjusting the under/overseers with sway bars, coilover settings, and/or tire pressures.

This build looks great. Very nice job!

Thanks for the advice. Right now we're so pressed for time we don't have the time to properly flare the fenders to fit the 275s, so I'm going to try and find a setup that will allow us to keep understeer in check without having to run 225s in the back. Old 911s at the local race track give us a nice supply of used race tires to choose from.

Thanks. Two years of my life have surrounded this car, I'm going to be very happy to see it done.

Engine bay pics?

x2

Just about to ask. Don't skimp on the good stuff!

I don't have any recent (past 48 hours) pictures with all the components in place. I'll get some tomorrow night after class and put some up.

I was sad seeing a hole in the hood.

Neat project anyway. :)

Yeah, I would have loved to keep it as sleeper as possible, but with the narrow-angle V6, there's no way to get it lower short of a dry-sump system.

You probably figured this out, but there's a similar problem when putting a ls1 in a NA. The miata tach wants a 12V uniform 2 pulse/rotation square wave signal. The gm ECU puts out a ~5V signal at 2 pulses/rotation so most people add a pullup resistor. My tach would bounce around sometimes at idle with the pullup and I'm not sure whether the MS is ok with that output being pulled up to 12V. Here's the signal that worked with the miata tach:

http://www.flickr.com/photos/2898429...in/photostream

That's very interesting. Thanks. The tach conversion kind of got dropped off the list for right now, as busy as we are with everything else, but hopefully we can get everything working again for next year.

Here are some pictures of under the hood, as promised. Keep in mind everything is in its semi-disassembled state, I just threw it all under the hood for a picture or two.

Attachment 240529
eBay Charge Piping kit FTW.

https://www.miataturbo.net/attachmen...ine=1316749878
The one part of the exhaust (flanges notwithstanding) that wasn't sourced from another scrapped exhaust- a 2.5" Weld-El for $11 from a local steel supply place.

https://www.miataturbo.net/attachmen...ine=1316749878
Looking down from the driver's side.

https://www.miataturbo.net/attachmen...ine=1316749878
Looking across the front from the passenger's side.

https://www.miataturbo.net/attachmen...ine=1316749878
Put to bed for the night.

Gig 'Em Ags!!!


Whoop OSU this weekend.


Love the build, let me know if I can get any parts to you. I see my brother this weekend who works in Zachry. Sorry I never got that Momo to you, last semester was hectic.

No worries. If you're out in CS on a weekend, hit me up if you want to see the car.

http://www.facebook.com/photo.php?v=182421915167936

Primed the oil pump tonight. Exciting to see this thing coming to life.