new guy here look for some help

[kelly brooks]

I have a 96 tahoe with L31 motor that I just did a 0411 swap on. I just got my efilive V1 on Wed and been playing around looking at things but, not making any changes. I started doing the VE tables by following the instructions.

My biggest issue is that it starts pinging or knocking at about 4000 rpm until it shifts. I logged it and the only thing I notice is my afr drops from 14.68 to 12.12 when the knocking starts.

so I am assuming I need to add more fuel as its getting to lean but not sure if I should do it at the PE modifier vs rpm or some where else.

here is the log from my calc.ve log. it happens at frame 5280.

like I said I am green. very very green so any help is appreciated

[WeathermanShawn]

Hi Kelly:

Welcome to the forum.

Generally your log and CALC.VE look good. It does appear you are getting some KR when you are at a lower RPM and add some throttle, and a few occurrences at Higher Rpm and greater throttle.

It appears to be occurring when you engine is undergoing greater load. You are hitting 'PE Mode' and the additional fuel is helping you avoid even greater KR.

You simply need to lower the Spark in those cells (and surrounding) a good 3-5 degrees if possible. I noticed your IAT's were pretty high. Where are you located? Also have you kept 'Burst Knock" enabled? That might actually help you in this case.

It's all about the Spark. Try a higher Octane gas or just run off your Low-Octane Spark for a couple runs and see if that solves it.

Good luck..

[kelly brooks]

I live in gilbert, AZ

I dropped the spark by 10% in the rpm range of 4000 to 5200 and grams/cylinder .60 to .76.

so I am not running lean I am running rich but, its actually helping me

[WeathermanShawn]

Yes, rich not lean..which is good.

You might eventually want to get a wideband and log your actual AFR's. If you have the V2 it is pretty easy to set up a serial connection.

On the issue of knock and spark. There are over a dozen factors that contribute to knock (KR). Sometimes KR can be 'false', in that it can be mechanically related sounds that set of the KR detectors. Regardless, the quickest and easiest way to know is to lower your spark.

So, yes try the lower Spark values and see how that works. If it persists, there are other methods to address it.

Good luck..

[joecar]

Hi KB,

If you remove two pid channels (e.g. DYNCYLAIR_DMA) you will get your pid channel count down to 24, this will allow faster pid updating on your next log (will give you 10 Samples/second vs 5 Samples/second seen in your log).

On the PIDs tab, the Channels column shows how many channels each pid uses (most use 1, some use 2); at the the bottom of the PIDs tab you can see the pid channel count. 24 or less pid channels gives you the fastest rate for your PCM.

The faster sample rate will get you a better waveform for KR... if the KR waveform shows a sawtooth pattern the it is real knock; if KR has a flat top (even after the PCM pulls down timing) then it most likely is mechancial noise (valvetrain maybe)... see what Shawn said above.

Can you audibly hear it knocking...?

[kelly brooks]

ya I just got my V1 4 days ago and just trying to figure everything out without blowing something up. LOL. Yes I can hear it but I think your right its valves because its flat top spike but, I have seen the saw tooth when I didn't hear it. Going to try and do a SD tune just need to do some reading on how to do it.

Thank you guys for the help so far it is appreciated

[kelly brooks]

ok I been looking at widebands. anyone recommend one over the other for use on a V1? Can I remove one of my stock O2's or do i have to weld in the new bung

[mr.prick]

Wideband Controller Poll

The ability to calibrate the sensor is the most important option.
The Innovate LC-1 or the Powerdex AFX are two choices.
The MTX-L also looks good.

[kelly brooks]

the mtx-L was one I was looking at. can I just remove one of my o2's or do I have to weld in a new bung?

[mr.prick]

You could but a dedicated bung for the WBO2 wont hurt anything.
Using the WBO2 to simulate an NBO2 seems to be hit or miss from what I have read.