Barry's Evoscan - Removing the Knock

[Kenneth]

The one which shows ~20 knock at ~70 load.

Knock can happen just about any RPM and it doesn't require huge load. Without some more diagnostic information it is difficult to make any judgements on why you get knock or if it IS real knock or not... could even be a combination of the two.

[BraindG]

The one which shows ~20 knock at ~70 load.

Knock can happen just about any RPM and it doesn't require huge load. Without some more diagnostic information it is difficult to make any judgements on why you get knock or if it IS real knock or not... could even be a combination of the two.

Well, i uploaded all the info in xls form, just need to unhide the data - if thats of any use?

[Kenneth]

Don't see anything obvious sorry. My only thought is that if you are revving freely, there IS a chance you have false knock. That is still just one scenario though.

Do you have a flashable ECU?

[BraindG]

Don't see anything obvious sorry. My only thought is that if you are revving freely, there IS a chance you have false knock. That is still just one scenario though.

Do you have a flashable ECU?

unfortunatly im stuck with a 7201 - so can't fiddle with anything.

lets see what happens post clutch/poly engine mount change, then again once i put on the new intercooler.

Thank you for checking Kenneth, value your time.

[Kenneth]

Let me know if you decide you want to buy a 7202/3 flashable ECU, I have one which I don't really need (had it in case I blew up a couple doing mods, but have only managed to stuff up one )

[foxdie]

unfortunatly im stuck with a 7201 - so can't fiddle with anything.

lets see what happens post clutch/poly engine mount change, then again once i put on the new intercooler.

Thank you for checking Kenneth, value your time.

If you don't mind a trip down to Brum I can reflash the 7201 ECU for you, although long term you'd probably be better off with a 7202/7203

[BraindG]

Cheers Jason, let's see how things are after my plan of attack, which is..

1. return MAF screw to original position
2. test run.
3. clutch/engine mount change
4. test run.
5. bigger intercooler on
6. test run.
7. new fuel filter
8. test run..

if after that i am still getting high knock on no and 1.1 boost then i have to consider more options, 1 being reflash ecufocusing on ignition timing changes and/or fuel.

[wintertidenz]

Are you running a heat range colder plugs with the increased boost?

[BraindG]

Are you running a heat range colder plugs with the increased boost?

i honestly cant remember what plugs are in there tbh - good point, i should check.

EDIT: Need a set of NGK BKR7EIX

[Davezj]

ebay the NGK part number, there were loads on there last time i looked and relatively cheap as well.

they seem quite expensive now about £6 a plug, when i got mine, i am sure i only paid anout £3 a plug.

http://www.ebay.co.uk/itm/6x-NGK-Iri...item35bc64cffe

maybe £38 for 6 delivered is not so bad. but work shopping around.

[BraindG]

i honestly cant remember what plugs are in there tbh - good point, i should check.

EDIT: Need a set of NGK BKR7EIX

Just pulled a plug out to check, I already have them - although I've no idea when they were put in, I'll search forums for clues..

[BraindG]

Ok, so i returned the MAF Screw to its original position (based on a secondary unmodified MAF i have) - I went for a couple runs and got max 5 knock - much better.

30-05-2012 19-40-54-beforereset.png

I then pulled over and reset ECU, then got a max of 10 Knock - i only did one run and it was about 3 minutes after reset, i should go for a longer drive and get ECU relearnt - then try again.

30-05-2012 19-36-36.png

Let's see what happens tomorrow, nothing to get excited about yet.

[adaxo]

Barry, you do that runs just now?? its a bit colder and damp outside now so that could help to reduce knock me think??

BTW great thread, watching with big interest as I got evoscan for ages now but never really have a clue what means what

[BraindG]

Yeah I already considered that, the previous runs we're done just after sun set, 10ish I think - that run was done when outside temp was 26, didn't log what the temp was on previous runs. But you are right, it has to be taken into consideration.

I'll check the spreadsheets and get te inlet temp and reply.

[BraindG]

BTW great thread, watching with big interest as I got evoscan for ages now but never really have a clue whadt means what

Tbh, I really don't know what's what either - but as part of my Job I spend hours searching through performance logs on servers. Looking for issues - so that bit I can do, just don't fully understand what everything means and or what effects they have on each other. But, we have some very knowledgable people on here that can provide some guidance.

[BraindG]

Ok, some temp figures..

#32 - Max 15 Knock - Airtemp, before flooring it 84 - Airtemp at highest knock 78.8
#52 (After MAF Fix) - Max 5 Knock - Airtemp, before flooring it 89.6 - Airtemp at highest knock 86
#52 (After ECU Reset) - Max 10 Knock - Airtemp, before flooring it 96 - Airtemp at highest knock 91.4

need to run more logs tbh, as the post ECU Reset i think is a bit bogus, the car was sat still for a while heating up in sun whilst waiting for reset, then i was on idle for a while and did that test only a matter of minutes later - and not fogetting that the ECU is still in baby mode and needs to learn.

but looking at the first two, i got lower knock at higher temp post MAF Fix - again, i'd need to log some more consecutive runs to get a better overall view.

edit: but lowest knock occured where temp difference between "before flooring it" and "highest knock" was at its smallest, unrelated?

[BraindG]

As a side note, i was doing some reading on the WWW regarding knock causes - most of which we have covered in this thread however, there was a couple additional points that were not mentioned yet.

1. Carbon build up - How would i clean this without stripping engine? (redex?)
2. Injectors need cleaning.

Thoughts on those two topics?

[Kenneth]

If it were me, I wouldn't bother until getting that big intercooler in. No point in chasing remote possibilities until you address the most obvious/likely cause.

[BraindG]

If it were me, I wouldn't bother until getting that big intercooler in. No point in chasing remote possibilities until you address the most obvious/likely cause.

Agreed - I'm just trying to build up a strategy in my head of next logical steps, in the chance that doesnt resolve - although, the googling i did before all suggest getting a bigger intercooler as a first step (just like you are suggesting). The reason im talking about the above was because two of the articles i read discussed the carbon build up due to using lower octane fuel, which i have done on a number of occasions.

[Kenneth]

Came across this which was interesting: http://www.fiatforum.com/bravo-brava...ml#post1328722

Might be worth a shot at least! By the sounds of things you can just buy white spirit and use that.

As for injectors, I think taking them out and having the properly cleaned (and flow tested) is probably the most worth while way to go. If you are going to do it, do it right.

Agreed - I'm just trying to build up a strategy in my head of next logical steps, in the chance that doesnt resolve - although, the googling i did before all suggest getting a bigger intercooler as a first step (just like you are suggesting). The reason im talking about the above was because two of the articles i read discussed the carbon build up due to using lower octane fuel, which i have done on a number of occasions.