NefMoto

Edit: Sorry, this should be in the Diagnostics section, mods feel free to move.

Hi all,

I'm attempting to replicate the ME7.1 nefmoto community tune onto ME7.1.1 (C5 Allroad TIP). I understand there are some differences, in particular the PID behaviour - http://nefariousmotorsports.com/forum/index.php?topic=12352.0

At this stage all I'm trying to do is add some boost via LDRXN and some fuel at WOT with LAMFA (plus a little timing adjustment). Here's how that looks

(http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=23411.0;attach=40855;image)

This has resulted in a flat spot at around 3000rpm. Happens on every pull, some worse than others and more noticeable in 3rd compared to 2nd. Car pulls nice up to 3k, falls on it's face, then pulls nice again up to redline. You can see in the graph below the RPM's drop a little when this happens, seems to be right before actual boost reaches desired. The calculated AFR is concerning (15.6!), but is that the cause or an effect?

(http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=23411.0;attach=40849;image)

And a huge drop in power
(http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=23411.0;attach=40851;image)

The desired boost follows actual nicely, so DV's and N75 seems to be working as they should. Though there appears to be a fuel cut based on injector DC

(http://nefariousmotorsports.com/forum/index.php?action=dlattach;topic=23411.0;attach=40853;image)


Is this an intervention of some kind? Logs attached have a 2nd gear pull uphill that wasn't bad at all, followed by two 3rd gear pulls. Greatly appreciate any assistance.

Did you close the spark plug gaps down to 25 thou? also Check your EGT sensors for codes.

Fuel pump or bad spark plugs/coils

Log lambda voltage

Thanks for the quick reply's...


I haven't checked plugs. EGT's are coded out for now until I can repair/replace them.


Lambda voltage was logged, wouldn't it be open loop at WOT and referencing LAMFA map?

I'm maxing out misopl1, so look's like I need to tweak KFMIRL.

Your lambda voltagr under WOT is under 0.5V that mean you have no fuel, your fuel pump is bad

Yeah you're right, the injector on times are way high too. Time for a fuel pump upgrade.

Thanks heaps.

Well it's not the fuel pump. I replaced it with a Walbro 350lph, along with a new fuel filter and FPR for good measure. Still have power loss around 3000rpm.

Log again

Still some kind of fuel cut. I don't understand the injector DC drop (sample 2240).

I also have bad overboost happening causing the throttle plate to close, but that's after the initial drop in power.

Still no fuel, did you put some cheap aftermarket pump?

You need to check pressure of fuel u der WOT, or get wideband

Link to pump (https://walbrofuelpumps.com/ti-automitve-gss352-intank-fuel-pump-350lph-high-pressure-universal.html)

If it was the pump, why does the injector duty cycle drop?

nope, you get lean condition before injector drop

Hmm... Surely that pump would be sufficient.

Injectors?

Thanks for your help by the way.

Put the computer away, and:

1. Get WBO2 (with linear out, so it can be fed into the ECU as well for logging).
2. Attach fuel pressure gauge and verify that pressure is fpr+boost during WOT.

All fine now. Someone had mixed up the vacuum lines to the FPR and N112 valve, so the FPR had constant vacuum and would never raise to 4 bar.