TrackTestedMiata

93 Eunos Roadster(same as miata)

Manual Trans
1.6 Automatic 9:1 comp engine(stock)
MS1, using the recommended HR-10 hi res firmware
Using tunerstudio, but will use anything at this point.
Wells TPS mod, done as writeup shows....
t25 Sr20det redtop turbo unit
AEM xx-4100 wideband with guage
afm delete
GM AIT sensor, wired properly
F/P jumped properly.
90 RX7 NON TURBO Hi imp. 460cc injectors.
v mount IC setup, with surge tank, rad cap welded closed on rad
ms running as standalone(on its own)
Now, The issue is,
BTW, according to whom i bought my ms from, brain checked it all and made the harness, aswel.
https://www.miataturbo.net/showthrea...ght=megasquirt

The car LEAAAAANS out hardcore, idling. like 14...15.16.5......17....19....
over the span of maybe 10 secs.

What the **** is wrong?!?!?!! I cant figure this out. Im trying to get it so i caqn move the car at least. Ive had some handy folks have a look already, and one guy got itto idle by richening the ve fuel table up hardcore(like redic) so it stays around 14ish, but it goes up and down.(13-15.5)

Ive tried everything. basemaps, none have worked, at all.

Someone Please help me!

(ps, ive combined my threads into one lovely condensed "my car is fucked"thread. )


Anyone?

miatauser884

iTrader: (11)

Do you have the chassis ground and ECU ground on your wideband setup properly? Make sure all your enrichment settings are off during initial tune. You could be adding a lot with the warmup enrichment settings.

TrackTestedMiata

I should split the grounds for the wideband? I have the ground tied into the ground wire in the harness that goes to the ecu.

So in other words

ground aem to floor
ground aem to harness
ground to ecu(in harness ground to ecu)

Zaphod

Post an MSQ and a log would be a start...

miatauser884

iTrader: (11)

I've got one AEM wire grounded to the head. This is where my diypnp grounds because it uses factory harness ground, Then I have the other grounded to the chassis.

webby459

iTrader: (8)

Here was my msq. 1.6, stock, 2560R, fmic, stock coils, ~440cc injectors, high imp, still had the fan switched by the stock sender on front of head, stock fuel pressure/pressure regulator, 93 octane, 1.6 IAC. It idled well, fairly conservative timing map iirc, ran a little fat on the big end. Probably could have used a little cold start tuning.

This msq should work to at least get you started, etc. Common disclaimers apply, I am not responsible for you blowing up your engine, etc. You probably shouldn't get into much boost without some tuning.

I would wonder about your wbo2 indicating that lean condition, because mine starts at stoic then climbs to 20+ without exhaust running past it. Did you calibrate it, etc? Is this the same way it behaves without the engine running?

webby459

iTrader: (8)

Also, what do your cold start/afterstart enrich look like? Maybe the map is really lean, and it's only at stoic when it first starts because it's in cold/after start, then once it gets out of cold/after, it leans out as per the map. When you try to richen it up, does it stink like rich/shoot soot out of the exhaust?

I don't think the ground alone would cause it to indicate so funky, that would just give you the usual non-matching wbo2 gauge v MS logging numbers.

webby459

iTrader: (8)

One more thing. I think in the exhaust constants menu make sure your gego or whatever the closed loop wbo2 settings are called, you set the lower rpm limit to above your idle speed, or the MS will attempt to adjust mixture based on o2 feedback, and it can lead to some instability. You should at least have this in open loop while you are still twiddling with the base map, and put it in closed loop if you want if/when your idle mixture is stable and idle is solid.

TrackTestedMiata

so these are the issues

the car starts and runs once it is out of the afterstart enrichment it starts to lean out

Ive maxxed out the ve table in the area of where it idles to get it to idle beyond 30 secs but it is very irregular afrs are bouncing all over seems to cycle every 10 seconds lean then rich

ive tryed disabling the autotune function it makes no difference


I got the timing setup properly i used a timing light and got it dead on, did it by adjusting the fixed angle

so it idles rough and its searching, tryed unplugging the Bac/Iacv samething i cannot get a smooth idle out of it

a light blip on the gas results in fuel cut dead lean but will stumble back to an idle i tryed to use the accel enrichment function but it made almost no difference even maxed out

at this point i'm thinking the unit is cooked, bad fuel pump, bad injectors or a wiring gremlin

ive played around with the req fuel setting i had it up to 12-14 then i could make the map look kinda normal but it would run the same way

the data logs are attached

(this is Tracktestedmiatas friend)

FRT_Fun

iTrader: (19)

Why -2 for TPS and never changing in the data 3 log? Is that like a 1.6 thing? And spark angle?

miatauser884

iTrader: (11)

for 440s on a 1.6, I think req fuel should be about 6.1

TrackTestedMiata

what do you mean by spark angle?

TrackTestedMiata

the -2, we adj the tps but it might have moved, ever so slightly. Thats fine, or do we neeed to re calibrate?

TrackTestedMiata

anyone?

webby459

iTrader: (8)

Dude, what?

Forget about the tps for now. What is the deal with your spark angle flatlining? In megatune, open your msq and click on spark, then spark settings, and make sure your fixed angle is -10. If it's not -10 the ms will not use your spark map, it'll just provide fixed timing at whatever number you provide there. I thought you said you set base timing. I almost guarantee you didn't do that correctly.

Hey, and did you even try my msq? I'd bet you'd get a runner with that one. I have the desire to help you and berate you at the same time. I will interject my next post to you with belittlement.

ArtieParty

iTrader: (1)

Correct me if I'm wrong here, but wasn't there something funky about the 93 miata's and its fuel or ignition? I wanna say it was the california cars had something different than the other cars. Maybe this applies to his also. There's a mod that has to be done to the 93 ms's to get them to work.

ArtieParty

iTrader: (1)

Here's the 93 and MS thread:

https://www.miataturbo.net/megasquirt-18/warning-before-you-add-ms-your-93-miata-32367/

webby459

iTrader: (8)

His msq does have -10 for fixed angle, and his advance map doesn't have -1 in the cells, yet the spark angle in the log is stuck at one value all the way through. I'm not sure that would cause his problems, but that seems very strange to me.

miatauser884

iTrader: (11)

Go through the steps and explain how you set the base timing. Did you select fixed timing and then adjust the CAS? Did you leave CAS alone and tweak spark angle? CAS could be bad if no advance is ocurring after you set MS to use spark map.

For clarity, My fixed angle is 10 degrees, not -10 in tunerstudio. Then I adjust the CAS until my timing mark lines up with the number 10.

Alternately, you can adjust the spark angle in tunerstudio instead of moving the CAS.

webby459

iTrader: (8)

^Funny thing is, in his msq the fixed angle is at -10, so the MS SHOULD be responding based on the spark map, and not at a fixed angle.

You forgot to mention that you have to set the fixed angle back to -10 after you set the base timing, otherwise it will be "fixed" at +10, or whatever you set with the CAS.