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Obd Tuner Ecu Loan


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#1 1cobrav8

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Posted 13 December 2018 - 10:09 PM

Hi Guys, 

 

Would anyone be wiling to lend me there obd tuner ecu for a week so I can carry out a back to back test against my OBD Tuner pro ecu as me and a few others are having issues with what we believe is false knock. I can run low boost like chill and remove the issue but as soon as I ramp up the boost like I did with my last engine I can a knock issue with my obd tuner pro ecu.

 

I can of course save your calibration before I change anything and then load it back in before returning it. Any hep would be greatly appreciated. 

 

Rich



#2 Exmantaa

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Posted 14 December 2018 - 09:44 AM

Hi Rich,

I have a spare ecu with the standard OBD. It also has the immobiliser encoder + key chips seperate, so you can run it like that. Need to check where I have the OBD programming keycode saved... :-?

#3 oakmere

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Posted 14 December 2018 - 12:17 PM

I have always suffered with what I believe is false knock with std bod tuner. So I will be interested in your findings.
The Schrick cams I run are short duration high lift which does cause some valvetrain noise. I often thought this might be the cause but not sure 🤔

#4 Arno

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Posted 14 December 2018 - 12:55 PM

Phantom knock is quite common on modified engines as the knock sensor location and software calibration usually isn't changed from the OEM install to combat it. Often times it's other sources of noise that get into resonance just in the same frequency range as where the knock sensor 'microphone' is most sensitive. And if this background/secondary generated noise overlaps an ignition time window that the ECU is looking for knock then it counts it incorrectly.

 

Tends to show up as knock in fairly 'odd' locations in the map where you would not expect it like part load around 2500 rpm. The engine itself should not be knock-limited in such areas and often you see that adjusting fuel or ignition in these area's has little to no effect on this 'knock'. Like mentioned above, cam/tappet noise can be a contributing factor, but even a 4-(2-)1 manifold can give differing exhaust pulses that can set off such resonances. Anything from the car touching the block that's not secured with clips or is not isloated with flexible couplers and such is also a potential source.

 

It can be quite informative to use an old-skool acoustic knock kit (basically a headphone, amplifier and contact-microphone you fit to the block) and listen to the actual noise. With the human ear&brain you can often hear quite a distinct difference in noise/tone between real knock and issues like these. Good method to get a feel for something like this an wether it would be safe to disable knock detection (or increase noise margins or reduce sensitivity in that range if possible) once it's clear that there is actually no knock present.

 

Bye, Arno.



#5 CHILL Gone DUTCH

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Posted 14 December 2018 - 01:54 PM

:D



#6 smiley

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Posted 14 December 2018 - 02:40 PM

I remember one of the dutch guys putting a small rubber gasket on the detector to tackle this.

 



#7 CHILL Gone DUTCH

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Posted 14 December 2018 - 05:42 PM

I remember one of the dutch guys putting a small rubber gasket on the detector to tackle this.


Is the engine still running

#8 Exmantaa

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Posted 14 December 2018 - 06:18 PM

I remember one of the dutch guys putting a small rubber gasket on the detector to tackle this.

 

?? Who, Rob? :unsure:



#9 1cobrav8

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Posted 14 December 2018 - 06:50 PM

Thanks frank I may take you up on this in the new year. I'm not so fussed about this engine as I will be only be running up to 400 due to the block long term but i dont want anything holding back the new 2.5 engine if I can hep it. 



#10 smiley

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Posted 14 December 2018 - 06:59 PM


I remember one of the dutch guys putting a small rubber gasket on the detector to tackle this.


?? Who, Rob? :unsure:

Daan iirc. I pinged him to verify.

#11 chris_uk

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Posted 21 December 2018 - 04:44 PM

just stick a knock unit on and see if it correlates with the software.. 



#12 1cobrav8

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Posted 23 December 2018 - 09:27 PM

After loading mine and others ignition maps in some life racing software to see the ignition curve in 3D it’s suoriaing still how many spikes are in the map. I’ve made a new base map and will see how I get on in the new year, that’s if I don’t change my engine first for the new 2.5 lol




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