JasonS4+Festicle

Here is a graph showing my knock sensor activity trend lines. I thought it might be useful for people to see.

Again, my set-up:

KO4s, Piggie Pipes, RS4 ICs, X-chip, MBC (no N75) - boost set at 22psi - tapering to 20 at fredline, TCD, green top injectors, Piggie MAF housing (88mm), open element K&N cone air filter.

This graph only has trend lines for cylinder #2 which has the most acitivity.

My car seems to be VERY sensative to adding timing with Lemmiwinks as log 7, 8 and 10 have 3 degrees of timing added with Lemmiwinks. The other logs have timing set at '0' (default setting in Lemmiwinks).

The main reason for posting this is to demonstrate how much better APR's ECUx is for logging. With VAG-COM, I'd see cyl #2 hit 29.8 (the max from what I've heard) at one or two time points in the log. The knock sensor voltages did not look too bad. With ECUx it's a different story and based on this info, I'd never run like this! ECUx is a very helpful tool - compliments VAG-COM, certainly not a replacement.

<img src="http://pictureposter.audiworld.com/36810/knockcyl2.jpg">

Settings:

log # / primary fuel / sec. fuel / timing / chan 2/ A:F (it tapers toward redline)

(The channel 2 setting was messed with just to see if they had any affect - it seems this setting has more to do with on/off throttle smoothness than it does for any major A/F changes.)

1 / -7.4 / 100 / 0 / 100 / 11.3
2 / -15.2/ 100 / 0 / 100 / 13--12.0
3 / -15.2/ 90 / 0 / 100 / ? (did not record)
4 / -15.2/ 95 / 0 / 100 / 12.6--11.7
5 / -15.2 / 95 / 0 / 95 / 12.4--12.0
6 / -15.2 / 95 / 0 / 92.2 / 12.3--12.0
7 / -15.2 / 95 / 3 / 92.2 / 12.5--12.2
8 / -15.2 / 97.7 / 3 / 92.2 / 12.8--12.3
9 / -12.5 / 97.7 / 1.5/ 92.2 / 12.8--12.0
10/ -12.5 / 97.7 / 3 / 92.2 / ? (did not record)
11/ -12.5 / 97.7 / 0.75 / 92.2 / 12.8--12.5 /
12/ -17.0 / 97.7 / 0.75 / 92.2 / 13--12.5
13/ -20.2 / 97.7 / 0.75 / 92.2 / ? (not recorded)

These logs were done on cool nights (~50F).

FWIW, cyl 5 is pretty much the same. The other cylinders are all fine except when timing is added, then they go up too.

Also, any idea why ECUx lets measured knock sensor acitivity go higher than 29.8 (which is what I thought the limit was)?

dscottjr

mples. You can see maf flow well beyond the vagcom limits with ecux.

Vagcom is the exact, or the attempt to be the exact, replica of the 1551 tool so any limits in the 1551 tool are carried over to vag.

sj6sp

If the conditions for the runs are comparible, it would be interesting to see differences in acceleration.

DAP@EPL

VAG-COM/1551 get the data from the diagnostic system, which outputs in certain formats. If the upper limit of those formats puts a ceiling on the data, then all you see is that ceiling value.

ECUx goes into the ECU and reads the raw memory locations so you are getting a true value without the limitations of the diagnostic formatting.

-Dave Pramanik

Toasty-Stg3::HCBP

Is this kind of tuning possible with the APR Stage II+ software. Is the max tuning available restricted by AFR and knock in my case?

sj6sp

I would be one of those people too if I could find a customer oriented installer with reasonable rates.

dscottjr

Oh, and ecux can be used with any s/w, it's just a logging tool. If you have not changed injectors, you're going to be limited by that. But, you can tweak timing and fuel settings with lemmiwinks.

Toasty-Stg3::HCBP

I've toyed with the idea...not in a real hurry to get rid of it, I love it, but if the right money came along, I'd part with her, save my money, and get an E55 AMG or something.

With my mods what do YOU think it would be worth considering my mods? Stock S4's with similar mileage (54K)are going for $26-27K.

dscottjr

Drive it to MI and see piggie.

sj6sp

The thought crossed my mind. Wonder if install price includes lodging?