Barry's Evoscan - Removing the Knock

[Kenneth]

It could be going through a particular load / rpm cell that is causing knock then.

I would drop boost down as far as you can, then log. 0.9 is only a small drop and why do something twice?

I always log RPM, Load and Knocksum together so that I know if I should ignore the knock count.

[BraindG]

I would drop boost down as far as you can, then log. 0.9 is only a small drop and why do something twice?.

True, ill switch it off for standard boost

I always log RPM, Load and Knocksum together so that I know if I should ignore the knock count.

This Load setting?

29-05-2012 01-09-53.png

[Kenneth]

No.

Do you have a modified ROM? If so, use 2 byte Load (Requests 00 and 01), otherwise you want ECULoad (request 1C)

[BraindG]

No.

Do you have a modified ROM? If so, use 2 byte Load (Requests 00 and 01), otherwise you want ECULoad (request 1C)

mope, standard rom - ok, ECUload it is.. ok thats me for tonight, thanks Kenneth!

[BraindG]

I cannea seem to get the "Calc Power & Torque" option to work, I get "object reference not set to an instance of an object" when clicking the button.

29-05-2012 07-14-37.png

I've configured the Settings as follows (based on Jason's Reply)

29-05-2012 07-12-51.png

I found the following thread mentioning a problem with it not working, but i think it differs to mine.

Any ideas?

[BraindG]

Here's another example of the knock coming off load, this was taken this morning with the boost controller off, i presume this means it's on default boost or if i turn it off at 1.1 it stays at 1.1? - its a HKS EVC 5.

29-05-2012 09-11-56.png

[Colin Wiltshire]

Following this with interest as I've just downloaded evoscan, saving up for the cable now.

[foxdie]

Firstly, in my own defence, I did tell Barry by SMS that 18 knock is "moderately high" and something should be done about it, however when he told me it happens whilst changing gear, I immediately thought "it's potentially false knock", I did give him a warning it could "possibly" be false knock but not to assume it is

That said, after actually seeing those graphs I'd say it'd be beneficial at this point to check AFRs in those knocking areas, it's hard to gauge what the cause is, it could be genuine knock or it could be a worn mount or clutch issue. Regardless, Kens advice is sound, start by reducing the risk and lower the boost to about 0.7-0.8 bar and see if it still happens.

(By default boost, that means turn the boost off so the car runs on the wastegate spring)

[BraindG]

I already ran the test with boost off, 2 posts up - still getting 18 knock

I can't remember if I did maf mod, so going to check that and run again with no boost (boost controller switched off)

However the knock only appears to be there in later gears, not 1st or 2nd - if you review the graphs again you may notice - is thst normal?

however, today drivin home, built up area with speed bumps and a few T junctions I found the knock spiking really high, with no excess RPM (max about 1500-2000) - the knock alarm would sound turning left or right out of a T-Junction, aswell and completely randomly when going over speed bumps.

Further thinking today, the BOV could be affecting the fuel consumption, see one of the earlier posts.

[foxdie]

It does sound like false knock however it'd be foolhardy to assume it is.

I'm hoping someone else can add more to this thread, maybe someone with more insight / experience with false knock. I haven't seen it yet but then every car is different.

[BraindG]

Like anything in life one should never assume but, I still don't understand - under what conditions would 18 knock appear whilst pulling away from a t junction, max 2000 revs and keepin under 30mpg.

If that could be discussed it may give some clues, so what (not false knock) could cause 18 knock at those low conditions?

I'll post the CSV later when I boot up pc.

[BraindG]

Yet another full tilt graph, i have attached the xls aswell - note that you will have to "unhide" the other criteria.

29-05-2012 22-41-49.png

Not sure what happened to my low rpm/speed log - its missing, will have to do another tomorrow.

[Kenneth]

Looking at your latest graph, knocksum does still follow load.

Knock can happen at just about any load (though there is bound to be a cut-off) if the fuel and ignition are not correct.

Personally I would go out and get a 600x300x76 intercooler installed. Relatively cheap and gives you some scope to improve performance.

I have always found excessive knock when logging on vehicles with a standard intercooler.

[BraindG]

Oh, found one...

29-05-2012 23-01-51.png

29-05-2012 22-54-16.png

[BraindG]

Looking at your latest graph, knocksum does still follow load.

Knock can happen at just about any load (though there is bound to be a cut-off) if the fuel and ignition are not correct.

Personally I would go out and get a 600x300x76 intercooler installed. Relatively cheap and gives you some scope to improve performance.

I have always found excessive knock when logging on vehicles with a standard intercooler.

Just so happens, i have one coming soon.

I will be installing clutch and poly mounts before that though - so what ill do is run same test post installation and see what happens - then again once the FMIC is installed.

I just find it a bit weird that i get so much knock at low rpm/speed - i was actualll getting it on idle and just reving up to 4k - would you also expect that?

[BraindG]

Actually, regarding the idle revving thing i just mentioned - here is the graph..

29-05-2012 23-12-12.png

Seems just the first rev spiked with knock, the rest of the spikes you can see cap at 2 knock - situation was, went shopping, came back, started car, got evoscan ready then the graph begins.. could just be build up of fuel or something that cause the first spike.

[Kenneth]

I wouldn't expect that much knock doing just that.

[BraindG]

I wouldn't expect that much knock doing just that.

Which you referring to Kenneth, the low revs or idle graph?

[Davezj]

Barry I can't do pm with iPad, sorry for the hijack.

I am going ton have to call off the intercooler temp testing tomorrow, my father in law has fallen and broken his leg, he has gone to hospital and getting operation tomorrow, so we will be visiting him, tomorrow evening.

We will have to rearrange it.
Dave

[BraindG]

No probs Dave, can maybe leave it till sat, no hurry - all the best to father in law!