Nasty flat spot at 4100rpm at WOT vy v6

[Holden202T]

HOLDEN202... these things are actually set to factory @ 13 PE but have timers & other modifiers to bring them richer the longer there in PE, I'm sure the tuner tried all the different PE settings on a dyno & came up with the best power/torque curve to suit the AFR & timing mix!

regardless, a change from 12.9 to 12.6 is not going to show up a massive flat spot!

[VX L67 Getrag]

Too true & totally agree!

Just had another look at the log & seems there's a bit of knock detected too so might need to look at that if it's actual take a couple of degrees out if it's just interference may need to dull the sensor!

[Holden202T]

after looking at the logs i'd say the engine light your getting on it most likely o2 sensor rich its pretty safe at WOT to say the least! any o2 sensor much richer than 850 at WOT i reckon is going to blacken plugs but that said it shouldn't be making a massive flat spot either cause its not really changing at the RPM's you say its flat.

the fact that the knock sensor goes ballistic from about 3000rpm onwards till you lift off is worrying, but its also only taking a few degrees of timing out of the spark advance but the knock retard seems to say 20 degrees ?!?!? unless my adx is just screwed.

i'm also seeing 200 IAC steps at idle ?!?!?! may explain why it stalls, i'd be using the laptop, idle in park with a/c off open the butterfly more till its about 20 steps!!!

another thing, i know this things modified, but even my high octane spark map for ecotec was 13 degrees at 3400rpm WOT, yours shoots up to 23 degrees at this point and it just starts pulling knock retard, i'd suggest this tune is a bit too agressive!

but without seeing the tune its pretty hard to say!

[VX L67 Getrag]

OMG been waiting for over 1 hour for personal hotspot to upload these images, for the last 2 weeks or so the 3G network has been SOOOO slow between 11am & 2Pm melbourne time!

But totally agree with Holden202T & didn't even see the IAC at 200 steps & I thought the tune's were only allowed max 190 from factory but must be wrong!

Need to sort out the fuelling as previously mentioned & find out whats going on with spark, 20 degree's is pretty standard on these if all conditions are right, I've even seen a top swap on full noise with 10+Psi from an M90 running 16 degree's!

I don't think I've set the ADX up correct for retard or detect histogram as I just copied details out of the $A5 info, but I think it shows there's somewhat a problem!

[The1]

use show Maximum on the knock detect so it shows 1 when detected.

As a note for WOT narrowband o2's they can't be used at all even for slight reference, ive seen 12's and 13's pull 800-1000. Only for the fact if it's over 800 you know it's atleast rich of some description.

[Roosterinwa]

Just a quick message to all that have been offering their assistance in attempting to solve my issue... Thankyou so much for all your feedback, it is very much appreciated and with all advice taken onboard I will attempt to do a few slight changes and relog and see how it goes, hopefully i will be on the right track with all of your help... Will post another log soon and if possible... See what you all think (baring in mind I am a novice at tuning hence that's why I am here among the seasoned tuners.. Thankyou delcohacking and their members!)

[VX L67 Getrag]

GOOD Luck Rooster....

The1, cool thats what I thought as I was 99% sure thats what the o2 sensor sits on the power run of the dyno, with the knock stuff cool thanks still not sure it's setup correct as it wasn't showing any knock up top but heaps of timing pulled here's the ADX if anyone wants to look & give advice!

[Jayme]

thats the catch, the knock flag only shows up if you are just lucky enough to catch a frame exactly when the event happens. you trend to miss a lot of them. I find it better to track the peak of the knock redard manually in the graph.

[VX L67 Getrag]

Oh cool that makes more sense!

I like the export feature for knock too, but it's a PITA to manually do selective export & hoping Mark will be adding a feature for this in future!

[Schwuppes]

sorry to butt in like this, but how do i get KR and Knock detected to show up in the history tables?
The only 2 things i can select in the drop down list are "wideband logs" and "AFR target logs"


cheers