Page 1 of 1

Elyas Wolff - 1992 Mazda Miata with ITBs

Posted: Sun Mar 12, 2006 2:08 pm
by ElyasWolff
Name: Elyas Wolff
Vehicle: 1992 NA6CE Miata
Engine: 1.7L, 11:1 compression, Headwork, Intake/Exhaust
Injection: Port, alternating, 1994 1.8L 230cc injectors.
Description: V2.2 board with MSnS-E 29h firmware, running only fuel for the moment. AEM Wideband.

Well I am finally here!
The install was a bit of a PITA for me. My engine had only 300 miles of brake-in before the install, so I knew everything was working.
I need to state that I am a wrench turning monkey, not an electronics specialist.

I purchased my MS from DIYautotune with MSnS-e loaded (And I got to learn how load firmware myself thanks to a goof up in Easytherm) I bribed my best friend to do some soldering for my old AC equipment. he built the DB37 harness and gave me an old Pentium 1 laptop.

I installed a throttle body from a automatic Miata, because it is a true variable voltage TPS, and not just a on/off TPS like on the 5 speed.

The stock ECU is controlling spark and idle. I have the AFM hooked up so the ECU does not freak out, but I believe it is causing some hesitation (like it does in a stock car)

I did the DSM board mod to get a input form the CAS.

That is it about it for now. I am just tuning the fuel, and gearing up for a spark setup.


I really have to give my thanks to Aussie Driver, his .MSQ helped me to iron out the problems with my initial program.

Posted: Mon Mar 27, 2006 1:48 pm
by ElyasWolff
My car is now running MS and spark!
If you want to run spark and fuel on a Miata I have to recommend a V3 board. There are some V2.2 instructions out there (the DSM instructions were the most helpful, and the MSnS-E main page)

Once you get the board mods done, cut the wires going out from the stock ECU (brown) and connect them to your coil A and B outputs from the MS. This will send everything to the stock 1.6 igniter, and then the coils.

If you have a 1.8, then get some 1.6 coils and two VB921s. The 1.8 coils have internal igniters and are very prone to blowing up (a few people on Miata.net have had this problem)

I am using Steve and Nate’s "FM turbo" map. It is good enough to not knock on a high compression engine, but needs some tuning.

Posted: Sat Apr 01, 2006 2:44 am
by ElyasWolff
I just wanted to leave a note for everyone in this thread:

If you are having trouble with easytherm, check R7 and R4. If the resistance is less than 2400 then change it when you are writing your .s19

Here are the values I stole from Al:
(k-ohms)
-4F = 16200
68F = 2450
176F = 320

Bias resistor = 1814 (note this MS was purchased from DIYautotune)

Posted: Wed Apr 05, 2006 9:16 pm
by ElyasWolff
*drool* soon these will be on my car... after I make a manifold and a fuel rail.

Posted: Wed Apr 19, 2006 9:13 pm
by ElyasWolff
I have finished the Fuel rails for my 2004 Suzuki ITBs!
I am using the Suzuki injectors in the stock location. The fuel rails are made out of 6061, it is a dual feed setup using -6AN line from the tank to the return lines coming out of the Aeromotive A1000-6 regulator.

I am still working on the manifold, the runners will only be about 2 inches.

My vacuum log will be 30cc.

And my velocity stacks are spares from the Webber box at work.

I will post more pix as it all comes together...

P.S. I have a almost perfect tune right now with my single throttle body and stock manifold. I am still amazed how well my car is running on MS.
If anyone has a 1.6 setup similer to mine let me know and I will send you my .MSQ.

Posted: Wed Jun 21, 2006 4:49 pm
by ElyasWolff
I have the ITBs on!

I am using 2004 Suzuki GXS-R 600 throttle bodies with the Suzuki 240cc high impedance injectors. Weber 40 air horns. Aeromotive fuel pressure regulator. I have machined out a dual feed fuel rail, vacuum log, and welded together a shorty manifold.

Tuning has proved to be... interesting. Tuning ITBs is very different from tuning a single TB setup.

I fly cut my manifold today chasing a vacuum leak. I will post pictures and VE maps later...

(do a search for any of my posts in the Naturally Aspirated forum on Miata.net for extra info and pix)

Posted: Tue Jul 17, 2007 7:52 am
by WolfGTI
Alpha N works wonders on ITBs