Search found 74 matches

by MHTSOS
Thu Jun 08, 2023 6:34 am
Forum: You and your build
Topic: New 4-cyl ECU design
Replies: 32
Views: 25057

Re: New 4-cyl ECU design

Yes, the main problem with MAX9926 is the 85ms watchdog. You could disable adaptive trigger but then what's the point in using this part? Its sole purpose is to provide noise immunity and you lose that by disabling it. MRE is using the VR conditioner integrated inside TLE8888 that doesn't have a wat...
by MHTSOS
Wed Jun 07, 2023 2:36 pm
Forum: You and your build
Topic: New 4-cyl ECU design
Replies: 32
Views: 25057

Re: New 4-cyl ECU design

I took a quick look at the schematics. I have three remarks. 1. You should add capacitors at the crystal oscillator. 2. I would avoid using a MAX9926 as a VR conditioner since it has trouble working with trigger wheels that have low teeth count. 3. The use of simple mosfets as low side drivers is fo...
by MHTSOS
Thu Mar 30, 2023 5:43 pm
Forum: Dev: Hardware
Topic: Manufacturing options
Replies: 27
Views: 60775

Re: Manufacturing options

I can't really tell by the pictures but it doesn't look like solder has flowed up the IC leg.

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by MHTSOS
Tue Feb 07, 2023 6:41 am
Forum: User Support
Topic: micro rusefi pin1 5a fuse blew and pegging lean when coming on to load
Replies: 8
Views: 5707

Re: micro rusefi pin1 5a fuse blew and pegging lean when coming on to load

Just to point something out that you might have already checked. The mixture being lean and the wideband sensor indicating lean are not always the same thing. An overly rich mixture that causes a misfire will read as lean on the wideband because of the oxygen that's being dumped in the exhaust. Στάλ...
by MHTSOS
Thu Feb 02, 2023 9:09 pm
Forum: Dev: Hardware
Topic: S105 OEM ECU
Replies: 20
Views: 36124

Re: S105 OEM ECU

I'm not arguing that this design in this application works. It apparently does since its used by OEMs in actual cars. It is designed for a specific application and with the parts selected it will work fine, driving the engine it was designed to drive. But, if someone copies this design to use it in ...
by MHTSOS
Thu Feb 02, 2023 3:39 pm
Forum: Dev: Hardware
Topic: S105 OEM ECU
Replies: 20
Views: 36124

Re: S105 OEM ECU

The breakdown voltage for this mosfet is 100V minimum. The datasheet doesn't specify nominal and max voltage so this could might as well reach 200V under some operating conditions. I wouldn't want voltage spikes of this magnitude coming into my ECU. Also I don't think it's wise to use a mosfet in a ...
by MHTSOS
Wed Feb 01, 2023 6:42 am
Forum: Dev: Hardware
Topic: S105 OEM ECU
Replies: 20
Views: 36124

Re: S105 OEM ECU

This kind of driver will also need the "fb" voltage to be monitored by the CPU in case the load is shorted. This circuit will limit the current to 2A but in case of a shorted load the mosfet will have to dissipate over 28 Watts because it will go into its linear region. Στάλθηκε από το CLT...
by MHTSOS
Mon Jan 30, 2023 3:38 pm
Forum: You and your build
Topic: 2004 BMW 760 N73 "A big mistake"
Replies: 198
Views: 206150

Re: 2004 BMW 760 N73 "A big mistake"

Maybe the tank was filled to the brim and the one way valve was not working in order to stop liquid fuel reaching the canister?

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by MHTSOS
Mon Jan 30, 2023 3:31 pm
Forum: Dev: Hardware
Topic: S105 OEM ECU
Replies: 20
Views: 36124

Re: S105 OEM ECU

This has analog current limit. Nice approach but needs several small parts.

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by MHTSOS
Fri Dec 16, 2022 6:37 am
Forum: Tuning Support: Making it Run
Topic: Fiat Multiair control
Replies: 2
Views: 7804

Re: Fiat Multiair control

For driving the solenoid you have several solutions simpler than peak n hold. You can use a resistor in series like we do on low Z injectors. It would slow the response of the solenoid but you don't really care since you want it to be always active after power on. You could use a small switching reg...
by MHTSOS
Mon Sep 26, 2022 2:32 pm
Forum: User Support
Topic: Soldering tricks & hints
Replies: 58
Views: 57012

Re: Soldering tricks & hints

Be careful of the low temp solder paste you got. It's great for desoldering stuff from boards because it lowers the melting temp of the original lead free solder but if used for soldering it makes fragile solder connections. Don't use it on anything that is exposed to mechanical forces or smd parts ...
by MHTSOS
Fri Sep 02, 2022 4:19 pm
Forum: Tuning Support: Making it Run
Topic: Interruption on run
Replies: 7
Views: 5053

Re: Interruption on run

Once you get the oscilloscope you'll have a much clearer idea of what's the root cause.
Another thing. How are your grounds? I hope the guy that made the wiring kept the sensor ground separate from power ground. Where is the fan motor grounded?

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by MHTSOS
Thu Sep 01, 2022 5:47 am
Forum: Dev: Hardware
Topic: Coil Negative triggering for rusEFI
Replies: 3
Views: 5129

Re: Coil Negative triggering for rusEFI

Why not use the BMW sensor that goes around the spark plug wire?

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by MHTSOS
Thu Sep 01, 2022 5:43 am
Forum: Tuning Support: Making it Run
Topic: Interruption on run
Replies: 7
Views: 5053

Re: Interruption on run

The VR wire is shielded? This is quite important for interference from electrical noise. Also the route it takes through the engine bay. Avoid going near ignition coils and spark plug wires.

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by MHTSOS
Wed Aug 31, 2022 5:38 am
Forum: User Support
Topic: Mazda Skyactive Cam sensor
Replies: 31
Views: 21194

Re: Mazda Skyactive Cam sensor

When you connect tunerstudio it should pop up a dialog box saying what's the critical error.

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by MHTSOS
Wed Aug 17, 2022 9:56 am
Forum: You and your build
Topic: Vitara 1.6 8v
Replies: 10
Views: 6368

Re: Vitara 1.6 8v

Ideally you can make a peak n' hold driver with LM1949 but it can also work with a series resistor to bring the total resistance around 12 to 14 ohms. In that case you will have to calculate the injector dead times from scratch. Best solution would be to install a high-z injector that fits in this m...
by MHTSOS
Tue Aug 16, 2022 5:37 am
Forum: You and your build
Topic: Vitara 1.6 8v
Replies: 10
Views: 6368

Re: Vitara 1.6 8v

Easiest way is adding a series resistor.

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by MHTSOS
Fri Jul 01, 2022 2:40 pm
Forum: Tuning Support: Making it Run
Topic: Boost control tuning
Replies: 9
Views: 8957

Re: Boost control tuning

This explanation of PID has to be in the Wiki if it's not already there.

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by MHTSOS
Tue Jun 21, 2022 2:21 pm
Forum: Tuning Support: Making it Run
Topic: Greetings smart people
Replies: 28
Views: 13100

Re: Greetings smart people

What kind of SD card is it and how is it formated?

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by MHTSOS
Tue May 24, 2022 2:26 pm
Forum: Universal Boards
Topic: m102 2.3 8v mercedes E190 PROTEUS
Replies: 6
Views: 10376

Re: m102 2.3 8v mercedes E190 PROTEUS

This sounds like 2 squirts per cycle = batch injection.
4 squirts per cycle = simultaneous injection
and 1 squirt per cycle would be sequential injection.
How are your injectors wired in?

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by MHTSOS
Mon May 02, 2022 12:20 pm
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

Where do you connect pin 1 of your main relay?

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by MHTSOS
Mon May 02, 2022 12:08 pm
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

Do you have 12V at pin #1 and #5 of MRE?

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by MHTSOS
Mon May 02, 2022 10:17 am
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

Pins are correct. Measuring with a multimeter do you have 12V at pin 10 of the main relay when you turn the key on the ignition?

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by MHTSOS
Mon May 02, 2022 5:22 am
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

Can you make a diagram to show us how you have connected your MRE? What pin of MRE goes to what pin of engine harness and then upload your tune to Rusefi online to verify it's setup correctly. The Peugeot 106 uses a very similar main relay and the MRE drives it without a problem. Στάλθηκε από το VOG...
by MHTSOS
Sat Apr 30, 2022 10:17 am
Forum: Dev: Hardware
Topic: F103 dual channel wideband controller + EGT + 2 x AUX In + 2 Aux out
Replies: 85
Views: 126245

Re: F103 dual channel wideband controller + EGT + 2 x AUX In + 2 Aux out

AFAIK you are not allowed to use copper wire to extend thermocouple cables since every wire connection will act as a separate thermocouple junction and alter the reading. Ideally the thermocouple should be connected to a suitable connector right next to the IC so that it's cold junction compensation...
by MHTSOS
Thu Apr 21, 2022 5:39 am
Forum: Dev: Hardware
Topic: microRusEFI
Replies: 388
Views: 515064

Re: microRusEFI

Different rdson resistance. Pick the lowest one since it makes less heat while on.

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by MHTSOS
Tue Apr 19, 2022 2:29 pm
Forum: Dev: Hardware
Topic: Wideband Controller: Fully Custom, no ASIC!
Replies: 199
Views: 434210

Re: Wideband Controller: Fully Custom, no ASIC!

TP6004. It's a clone of MCP6004. Are you ordering from lcsc?

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by MHTSOS
Mon Mar 07, 2022 10:03 pm
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

The relays will be wired as main relay on pin 4 and fuel pump relay on pin 23.
Pins 7 and 10 are the security code keypad and the diagnostic connector and I don't think you'll use either of these features.

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by MHTSOS
Mon Mar 07, 2022 9:57 pm
Forum: You and your build
Topic: Success Story Fiat 128 / Zastava 101 1500cc on MRE
Replies: 37
Views: 26612

Re: Suggestion for starting 1st project

Both ECUs are able to run this engine as it's fairly simple. Your main issue will be ignition since your coils are "dumb" and the transistors that drive them are inside the stock ecu. Neither MRE nor Proteus have transistors to drive dumb coils directly. You will either have to use an exte...
by MHTSOS
Sat Feb 26, 2022 7:26 am
Forum: You and your build
Topic: Subaru SVX with custom RusEFI
Replies: 61
Views: 51983

Re: Subaru SVX with custom RusEFI

Yep, that's tight in space. If you place it where the battery is now how are you going to route the downpipe and the rest of the exhaust? Unless you go full mad max and just put a straight pipe through a hole in the fender. In that case you can also mount it low on either side of the radiator and us...