19 replies to this topic

[Kurvenjäger]

Hey good morning everyone
I am Max from Germany and I bought a Specialist components trottle Body with blue injectors and 50mm throttle body.
I am running a 274 Kent on a 1380 block with 1.5 highlift rocker arms. I am using all original sensors except the trottle position potentiometer which is one from specialist components.
With my old Mems ECU the car will start but will idle way to high and will eventually shut down cause it’s running to rich. Spark plugs are black.
When I go into the software (SX Tune) I can see the trigger count. And it shows that the crank sensor is not synchronized (with what synchronized). If I try another crank trigger configuration (default is Ducati 46-2) like Toyota or something which has different teeth count but also two gaps the car wants to start but doesn’t at least it gives me spark and fuel. Which it doesn’t when I select Ducati trigger wheel configuration. My standard flywheel has 34-2 configuration. SPI flywheel it’s the same like MPI I guess.
The engine is just put together and I don’t want to always start it. I did so several times already but I think ist not good for an engine which has not run in yet.
I will do the fine tuning on a RR
I have no idea how I will be able to fix that issue.
Do you have any suggestions for me ?
I would be happy if you reply.
Kind regards
Max

[Fast Ivan]

Have you tried talking to SC?

[mini13]

Well, it seems you are getting a signal from the crank sensor, as it sparks,

 

are you selecting MPI? if so it is probably looking for the cam sensor, if there is SPI select that, or if there is a cam sensor option de select it. 

 

do check for a spark, and that it is in the correct position with a timing light, there are some clutch differences between mini/metro/SPI's and MPIs that can move the crank trigger angle somthing like 30 degree's  ( see below link) or otmight need to be trimmed via the soft ware if it is a few degrees off. Also the reluctor ring in the back of the flywheel has been known to move on std flywheels, so again another reason the check the timing.

 

http://minispares.co...and-differences

 

I cant see anything regarding crank triggers in this, but it may be helpful for checking the other sensors

 

http://minispares.co...and-differences

Edited by mini13, 20 May 2019 - 08:57 AM.

[Bat]

Hi,

Spi trigger wheel is different to the MPI!

Spi has 2 missing teeth 36 -1 -1

MPI has 4 missing teeth 36 -1 -1 -1 -1

Therefore your synchronisation problem could be  the fact your spi flywheel doesn't match what the ECU is expecting or you need to disable the cam sensor in the software so it's not trying to sync the 2 together...

Cheers :)

[Kurvenjäger]

Thanks for the replies already
I changed the pressure plate to an updated one which should have a blue spot on it but it doesn’t. Blue spot is for injection cars. I ordered a C-AEG485 from mini spares which should be for injection but as mentioned has no blue spot. The timing should be right cause the Mems ECU is firing up the car with a bit of difficulty and uneven run but this should be expected from a ECU which is not made for running with this trottle kit.
I have talked to SC and I ran some updates of firmware etc. nothing actually seems to work
Still no spark and no fuel.
Selecting the Toyota crank configuration gives me spark and fuel but I have to play with the throttle to get a few hiccups.

[mini13]

ok that C-AEG485 will be fine as it is suitable for the injection cars.

 

what flwheel outer are you using? standard or somthing else? missing teeth?

 

the firmware may be updated, but which base map are you using? SPI MPI? as there may be sotmhing different in the settings

 

https://specialist-c...downloads-page/

 

the toyota is 24 teeth with a cam senser isnt it? this points to the ecu looking for a cam sensor, do you have a cam sensor?

[Bat]

Hi,

Have you tried swapping the wires round on the crank sensor?

You should use the correct settings for the trigger wheel in question otherwise everything will be out if you manage to get it started.

What's your fuel pressure set to?

Cheers :)

[Kurvenjäger]

My outer flywheel ist standard and I did not mess with the pressed in metal ring for the increments it’s the standard 34-2 missing teeth configuration. Right now I am using the standard SPI Configuration. But this configuration won’t give me any spark or (fuel i am not sure)
I have no cam sensor installed ist a 1380 standard SPI Block the engine worked before.
Of course I am not free of faults but so far as the car fired up with old ecu I am confident that I adjusted the timing right. It also will run smooth as I rise the rpm up to 1000-1200. But eventually shut down cause of missing fuel or too much fuel.
Fuel pressure is set to 4.0 Bar
Thanks

[Bat]

Hi,

Is the ECU a plug and play replacement for the spi mems unit?

If not I'd try swapping the crank sensor wires over. You can't cause any damage but there's a definite reason to try which would take a lot of typing to explain...

Cheers :)

[mini13]

as above,

 

also, spin the engine over with the plugs out and check sx tune for RPM to see if the ECU is seeing the crank signal, or if its a problem between the ecu and coil, you should see 200-400 rpm ok.

[Kurvenjäger]

They swapping the crank sensor leads won’t lead to anything cause the ecu is seeing a RPM signal already ist at 200-250RPM.
Can anyone explain why the Ducati configuration 46-2 should work when my flywheel configuration is 34-2 ?
Kind regards
And thanks for the help

[nicrizz]

I am not familiar with the SC ECU, but do you have to set a timing value for cranking (i.e. low rpm)?

From memory this should be around 20deg.

If it’s out the thing wont start, or will pop and bang impressively.

[mini13]

Ah!  curious! 

 

the ECU see's rpm but no spark,  this has a distributor correct? I am wondering if it is fireing  inbetween  the positions so the spark it not making it past the ditributor. essentially pointing to a timing issue. if you havent already check for a spark direct from the coil.

 

 

can you link to the SC kit you are using, and the base map you have loaded?

[Bat]

Hi,

You could be on to something there 13! I never gave it a thought about the dizzy, I always assume coil pack when thinking aftermarket ECUs...

Cheers :)

[mini13]

yeah, me too, then somthing clicked!