rusefi.com

PCM = Powertrain Control Module.

Meaning the ECU in Ford speak. Adding an "-ing" to the "train" changes the whole meaning. Similar to forgetting to put the "~" tilda over the "n" in the Spanish word for "years"

Awesome! That switching feature will sure come in handy. No need to remove injectors and bench-test. There will be people who will tell you that this is not a scientific method and doesn't reflect the real lag. To those I say: Stuff it! This approach creates predictability of injector behavior. That...

Your guesses at the MS circuits seem to be largely correct: MS3 filters MAT and CLT with 2k2 and 1.0uF. Since we don't have to have millisecond accuracy here, that's sufficient (cut-off frequency is 73Hz). TPS is filtered with 1k0 and 0.22uF (cut-off frequency is 720Hz). Vbat seems to be an unfilter...

Got some logs off the '99 with MS3 here- didn't have time to plug in the rusefi. Even with the engine running and no firmware smoothing applied there is no noise worth mentioning. With just a little software smoothing the noise goes away and still the values react to real changes quite snappy. The n...

If you look at the noise on the '90 Miata, you can see the short term order of noise on the MAT and CLT running exactly in parallel. The noise on the TPS is exactly opposite to that. So it's clearly something with the supply. So maybe more low-pass on the 5V side might help here. @russian: During th...

4k99s are in the basket. Any input on the 9926 vs. 9927 question?

A few things: - It appears you are not logging all values. In order to troubleshoot, I think we need to look at 'fuel: tps delta', 'fuel: tpsAccel'. I would also like to see the values for the engine load based accel calculation, but it appears they are not available for logging. - Your signals are ...

Hopefully the last question:
5k resistors run at almost $2/piece on Digikey. I assume using 4k7 at a price of $0.01/piece instead will not be a problem. Correct?

Looks like you get consistent lean spikes on quick upshifts. Everything else looks pretty spot-on or close to it. Post the tune please!

Oooops. Didn't realize you posted the logs. Will take a look.

In order to troubleshoot the fuel accel, it would be helpful if you could post a graph with AFR-AFRtarget (alternatively AFR and AFRtarget), MAPdot, TPSdot and rpm.

Also only tune accel enrichment on a fully warmed up engine.

I've had those boards sitting on my desk since April, when my life took a sudden detour. I'm back- at least for a little while. Is there still any interest in me populating these and giving them a whirl? What chip do I use? Digikey has the 9927 at $5.54 and the 9926 at $7.19. Doesn't look like we wi...

In order to accept CAN bus data, we would need to be able to set up the following parameters: - CAN protocol - Address to listen to - Bits used for parameter - High / Low- endian - Mathematical conversion to readable numerical value Suggestion: set up a list of generic variables, like CAN 00 to CAN ...

In order to increase non-timing-critical I/O capabilities, using external, cheap and simple I/O modules which communicate with the main module is an effective way of reducing the I/O demands on the central unit. In the automotive environment, the communication is usually done via CAN bus. rusefi alr...

In order to make any sensible use of rusefi with the '03, I need a WB O2 sensor. Fortunately, I still have one sitting around unused. But its' output is via CAN bus and nothing else, and -unfortunately- it appears that rusefi has no module for accepting sensor inputs from CAN bus yet. So I can conne...

The attached picture is my turbo 1.8l '99 Miata with VICS (red) vs. Squaretop (blue) intake, running the '99 head. Mods that may play a role here: - Turbo - +1mm valves all around - Removed EGR - 3" Exhaust - Running Megasquirt 3 Both runs were on the same road, with the same timing map. I was ...

Sorry- no idea about 1.6l interchangeability. But it doesn't matter. All money spent on the 1.6l is money wasted in short order. Focus on the 1.8l.....

Hi i like to test this sensor, $30 in ebay its ok to experiment, maybe the sensor attached to stainless steel tubing then welded to spark plug best regrads You need pressure sensor for 2000 bar I don't think so. Afaik peak cylinder pressure in gasoline engines is usually 1000psi and lower. So maybe...

That's the correct connector indeed. BUT: In order to be able to easily swap between stock ECU and rusefi I would like to have a few additional I/O, for example for the external MAP sensor, boost control and I'm sure I can think of a few more, if I really try. So I was thinking about using the 122pi...

I *LOVE* the new squaretop intake. With the old VICS the engine really bogged down after about 5krpm. And the VICS is pretty much the best intake available in any NA/NB Miata in the US. With the squaretop it feels like the engine just keeps going and going and going. Look how the power curve keeps c...

Since my '99 Turboed Miata runs like a champ on the MS3X, and the '03 naturally aspirated is still running the stock ECU, it was decided to make the '03 the new test vehicle for rusefi. Here are some issues I can think of right off the bat: - This car will have to pass emissions, so I need to be abl...

It's not necessarily that complicated- it really depends on the car and how 'returnless' the system actually is. For example: on '99 to '05 (NB) Miatas the fuel system is called returnless, but it actually has a return integrated in the tank which is responsible for keeping the pressure constant. So...

It also has an option now to update/install firmware. I don't think that was implemented in the earlier versions.

Ooooooh. VVT. Anxiously awaiting reports....

I'm back in the game! Live happened. Lots of distractions. Trying to sell our house and build our own - I'm shooting for a five-car garage :-) But after my Miata was sitting in the garage, partially disassembled, for the last 4 months or so, I finally got it back together. Slightly improved even. No...

I'm suffering from various problems: - "While I'm At It" syndrome - severe cold that lasted for 4 weeks About 4 weeks ago I decided to finally toss out the old five-0 (*) 850cc injectors, so I don't have to tune the Rusefi with old injectors. I already have 650cc Flow Force Injectors in ha...

Not sure if this matters, but your MAT and CLT show the same pattern on the noise. The short term variations on both move in lock-step. Interestingly, the vbatt moves opposite to that. Also with a 90hp car, you need to COMMIT to the throttle. There's waaaaay too much throttle-feathering going on. La...

I'll see what virtual dyno says. Does anybody know the weight of vehicle + driver?
Gear and diff ratios are also needed for somewhat precise VD data....

Awesome! Needs more data though :-) A few observations: - Looking at TPS and RPM data, it's quote obvious that you -unfortunately- don't have a traction problem - The regular noise on CLT and MAT follows the same pattern: Check your sensor 5V and GND - CLT calibration is off - CLT spikes every once ...

Street tuning works much better than its' reputation suggests. I've used Virtualdyno, combined with detcans quite successfully to tune spark. All you need for fuel is a wideband anyway. And then, after you have a perfect street tune, get the last 0.5% on a dyno.