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If you're taking the turbine and compressor assembly (CHRA) apart, do you have a way of getting it balanced after re-assembly?
I believe they're balanced together as an assembly, but not quite sure...

Because it was just $5 and because they are rationed out, I decided to order a Pi Zero. Now it arrived and I have no real project for it.
Does anybody have an idea how I can use it to help make a car go faster? Or better?

The TPS response not being perfectly linear doesn't make much of a difference in anything. Accel-enrichment based on TPS change is always fairly heavy-handed anyway. And the non-linearities could be tuned out with adjustments in the TPS/TPS table for enrichment. Noise is much more critical, so whate...

I ran the latest MSL through my database again and it looks like improvements over last time are marginal, if any. On the other hand, you're off by a max of 3% or so in the driving cells- that's probably better than stock! Your tune for the extreme cells can most likely still be improved, I notice y...

I paid $4 on Oshpark for three boards and $21 at Digikey for the components (I only ordered two of the 9926 chips). So how about $25 shipped to you? Mind if I keep one of the boards and a few resistors/caps, so I can build my own if the need arises? I think the board could also be used to decode the...

[...] Is MAP noise an issue? This most recent log appears pretty clean to me. I agree that it looks pretty clean in the log. What has me baffled is that the el_delta value for accel enrichment is often showing significant positive values, where there isn't much of anything going on. The only explan...

So how does it feel? I still notice a handful of times where you went pretty lean when enrichment should have taken care of it. And of course some occasions where it went too rich for a perfect world. But overall the log looks pretty solid. Your VE tune of all cruise cells seems to be near perfect. ...

[...] http://www.miata.net/garage/compatibility.html is our new favorite page. The only issue with NB is that we would not have spares and would not have an option to beg/borrow/steal from other NA at the track. But yes tempting :) We night try NB sub-frame with NA everything. The only difference i...

Right - forgot about the automatic! Just looked at a random log from your last post: Your TPS signal looks great, but MAP is pretty poor. Also Vbatt and CLT are not that great. IAT and TPS I'd say are the best looking signals in that log, followed by AFR. <threadjack> Two things I noticed, even thou...

Sorry, but I just don't like the noise in your signals. Most critical are of course TPS and MAP which should get their reference GND driectly at the ECU. tomiata : Is that how you wired them, or are you grounding them somewhere in the engine bay? They need a dedicated GND wire coming directly from t...

Unfortunately the stock ECU doesn't have a connection for a potentiometer style TPS. Stock '90 Miata is a simple switch. I'll measure my '99 Miata ECU which has a resistive TPS. EDIT: Just measured it- resistance from TPS pin to GND is 11kOhm. Resistance to +5V is 6kOhm. Any idea how we get to the i...

Eating burritos with russian and his wonderful wife is a real treat :) Thanks for lunch! On the VVT trigger shape, I found the following on Miataturbo.net: http://www.miataturbo.net/attachments/megasquirt-18/26645-wheel-timing-success-last-vvt_range.png?dateline=1318954233 So it's the same as NB1 wi...

Good points/ questions. I assumed that, just like with my NB1 and NB2 Miatas, the TPS is 5V referenced. However, it seems that the '90 Miata doesn't even have a stock TPS sensor, so I'm at a loss here. tomiata ? any data on your TPS sensor? Looking at Toms calibration, 0% TPS is 102ADC and 100% TPS ...

Alright - I ran your AFRs through a DB to analyze and we're looking pretty good! Your VE table seems to be close. The error shown is in percent. A negative number means you're running too rich, a positive number means you're too lean. Don't pay too much attention to the cells with a low record count...

That's looking pretty good! I have to apologize for the advise to lower your EL_Fuel threshold. It looks like you're real close to signal-noise level with your threshold (3), so we get a lot of enrichment where we shouldn't. Please increase it back to 6. Also: I don't understand why you sometimes ge...

Are the subframes and control arms usable? NB front subframe has been improved over the NA version. Gives you more caster and lowered mounting points for the lower control arms afaik. So if you can keep that and throw it on the racecar- I believe that swap should be possible without too much pain, e...

You're crazy. But the good kind of crazy

Congrats #24!
And good night i guess
Please share the schematic of your signal conditioner if you have a minute.

Just to make sure I got this right: The only way that the ECU know what angle the VVT is advanced by, is by comparing the CAM sensor signal to the CRANK sensor signal - correct?

I just looked at the code and it seems straightforward enough so even I can mostly understand what it is doing. It calculates a delta (tpsTo - tpsFrom) and if that exceeds the threshold, we look up the value in the table (presumably using tpsTo and tpsFrom again) and that is your enrichment. One que...

Tuning accel enrichment is all about drive-ability and not really perfect AFRs. In a perfect world we'd have perfect AFRs under accel conditions, alas this is never going to happen. At least not without somebody tuning this who knows a TON more than I do. Running the stock ECU, there are some seriou...

My question remains: Why is there no TPS-enrichment, if we're clearly above the threshold? tomiata : are you sure you had the table entered and the TPS threshold set at 3.0 for the log you posted? I'm asking because I can't find much accel-related problems in that log and no TPS-based acceleration h...

That's quite strange: Both logs show absolutely ZERO TPS fuel! And that even though in both logs you are clearly above the TPS-threshold of 3.0 in many places. Explanation: The values in the TPS-Table establish how much fuel is added per throttle movement. So when you start at 0% TPS and go to 10% T...

Any videos and data logs from the weekend?

I made some changes to your tune and uploaded the file here. Have fun with it. As I said- you're well on your way. We'll have this baby running better than stock in no time! BTW: I didn't touch your ignition table, but it seems very conservative to me. Do you have reliable access to 93 octane fuel? ...

Well, I have good news and not-so-good news :) The good news: - TPS-accel is adding fuel - The lean condition when going from decel back on the throttle seems improved, presumably due to the added VE bottom row - The taper for MAP based accel seems to be working as well Not-so-good: You need more VE...

So tightened nuts are not a guarantee of a successful race, but loose nuts are a guarantee of lack of success?

Sorry man. I wish I had a spare spindle. Will you be OK for Sunday?

I was trying to upload just the VE table, but the forum doesn't allow posting of *.msqpart files. So I renamed it to msq- rename back to msqpart so you can import it in the file dialog in the VE table.

More data- Awesome! Looks like you need another row below 30kpa in your VE table. Some of your troubles stem from running in cells that are outside your VE table and are therefore not properly tuned. If you look at the logs, you often get very lean conditions when you're coasting under part- or 0-th...

I'm going to add my '03 (manual trans) Miata with VVT rusefi-conversion to this thread if that's OK, since there's going to be a lot of overlap. Updated the wiki on NB2 (2001 to 2005) Miatas: http://rusefi.com/wiki/index.php?title=Vehicle:Mazda_Miata_2003 Will also add suggested wiring including WBO...