In higher rpm car stutters

All Megasquirt 1 support questions. See also the Documentation

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md95
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Post by md95 »

Another idea as well, but I used to have a misfire/studder under higher boost, and this is even with a Crane ignition box..I was using stock spark plug wires, which was the problem. I upgraded to some high quality "racing" spark plug wires, and the problem was completely gone. Higher cylinder pressures under boost, especially higher boost, needs a real strong spark..Stock plug wires sometimes just cant cut it..Try replacing your wires, and see what happens..And like mentioned, run a smaller plug gap, maybe in the .025- .030 range.
-Matt-
1998 Mitsubishi Eclipse RS 420A Turbo- MS2 Extra- 2.1.0 Release
1992 Plymouth Laser RS 4g63 AWD Turbo MS2 Extra- 3.0.3s
ASTB
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Post by ASTB »

md95 wrote:Another idea as well, but I used to have a misfire/studder under higher boost, and this is even with a Crane ignition box..I was using stock spark plug wires, which was the problem. I upgraded to some high quality "racing" spark plug wires, and the problem was completely gone. Higher cylinder pressures under boost, especially higher boost, needs a real strong spark..Stock plug wires sometimes just cant cut it..Try replacing your wires, and see what happens..And like mentioned, run a smaller plug gap, maybe in the .025- .030 range.
The problem is when i use my original ecu with
same loom and same edis the car runs perfect Up to 70kpa.
I tested the megasquirt with only 20 kpa and the same afr like the original ecu. But it sutters.

So the problem must be the megasquirt or my adaptor.
That the adaptor is the problem is very improbably because up to 5000rpm and over 6000rpm it runs perfect.

Does anybody drive MS V3 Board with EDIS without problems?

MCNugget drive V2.2 in the same car, with a similarly Adaptor with EDIS without problems.

I see that the Q6 in V3 use a 2N3904FS.
The V2.2 use for Q9 a 2N2222A.

Can it be the problem?


kind regards

ASTB
daxtojeiro
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Post by daxtojeiro »

ASTB,
I have sold a few MS V3's setup for Edis and I have always replaced the 2N3904 with a ZTX450, its a straight swap, a 2N2222A would be the same. I doubt its a problem but its worth a try Ive never tested it with a 3904
Phil
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McNugget
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Post by McNugget »

I checked the datasheets of both yesterday and I found out the the 2N2222 has a collector current of 800mA. The other one, 3904, has just 200mA.

I think that could be the reason. But I'm still wondering 'cause that meens the EDIS eats more than 200mA at an input line. Thats pretty much!
Running Suzuki GSXR 750 SRAD throttle bodies on Ford Zetec 16V
Using MegaTune2.25 and MS1 v2.2 with Spark'nExtra 029q, Knock system installed
McNugget
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Post by McNugget »

I'm wondering about the fact, that the developers of MSv3 downgraded these transistors. Does it make any sense?
Running Suzuki GSXR 750 SRAD throttle bodies on Ford Zetec 16V
Using MegaTune2.25 and MS1 v2.2 with Spark'nExtra 029q, Knock system installed
ASTB
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Post by ASTB »

Hi,

i will change the transistor today and then we see....


kind regards

ASTB
ASTB
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Post by ASTB »

Hi,

today i changed Q6 but the same problem.

Somebody an idea?


Bye

ASTB
McNugget
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Post by McNugget »

Did you try my old firmware?
Running Suzuki GSXR 750 SRAD throttle bodies on Ford Zetec 16V
Using MegaTune2.25 and MS1 v2.2 with Spark'nExtra 029q, Knock system installed
ASTB
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Post by ASTB »

McNugget wrote:Did you try my old firmware?
I tryed, but same problem.


Then i remove "SAW" Signal from EDIS and the car run without sutters.

So, the problem must be the EDIS Signal from Megasquirt because i tested my original ECU with same loom and edis and the car run perfect.

What can it be? :cry: :cry: :cry:

Here my mods for EDIS:
- I use LED17 (D14) for output
- I have use a 1k resistor (i test it, it have 890 ohms) between D14 (-) and rightside of R24
- I have a wire from D14(-) to "IGN"
- I use on DB37 PIN36 to EDIS SAW
- I removed C30
- I have a wire from top of c30 to S12C
- I removed D1 and D2
- I removed R12 and use a 2k resistor
- jumper "tachselect" to "XG1"
- jumper "optoout" to "tsel"


Thats it....

The loom is original Ford for use with EDIS.


bye

ASTB
McNugget
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Post by McNugget »

ok, try the following:
Get an osszi somewhere and connect some wire to the saw-pin directly at the EDIS4 module. Then connect the osszi and check the signal visually.
Check if there is a difference between the signal from the EEC-IV and the MS board.
If the SAW signal is the problem there must be a difference even at very low load. I meen 5000 rpm at no speed in front of your garage or something.

If you experience any spikes or thinks like that you're not able to see with your EEC-IV, you may have the problem in range.
Running Suzuki GSXR 750 SRAD throttle bodies on Ford Zetec 16V
Using MegaTune2.25 and MS1 v2.2 with Spark'nExtra 029q, Knock system installed
ASTB
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Post by ASTB »

Hi,

thats the problem. Nobody has nen osszi at home... :oops:

Yesterday i changed the edis. But same problem.



Bye

ASTB
jsmcortina
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Post by jsmcortina »

McNugget wrote:Well its just an idea. I think MSv3 has four ports. MSv2.2 has just two.
Don't think so.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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ASTB
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Post by ASTB »

jsmcortina wrote:
McNugget wrote:Well its just an idea. I think MSv3 has four ports. MSv2.2 has just two.
Don't think so.

James
Now i see, that i the injector wiring is wrong.
I use for Port A = 1,4
Port B = 2,3

But at the moment i use simultaneous injection.
So it can´t be the problem or not?

Thanks

ASTB
jsmcortina
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Post by jsmcortina »

It shouldn't really matter how the injectors are wired up as Megasquirt is a batch/bank fire system.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
ASTB
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Post by ASTB »

Hi,

my problem is solved.

I´m so stupid.

I jumper on megasquirt the injector 1 with 33 and 34.
and injector 2 with 35-36. :oops:

With the right jumpers, the car runs perfect!!! :D :D :D

Thanks for your help


kind regards

ASTB
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