Hello

I have an Audi S3 8L 225Bhp (BAM), mods are, Badger5 Tip and cone filter, Forge recirc DV, PCV and n249 removed, silicon turbo outlet hose/breathers.  Standard apart from that.

The tuning file I have done is just a mirror of the BFV engine file with some additional fuelling via LAMFA as advised on a post on this forum.

I have done some logging today and have some questions about what to be concerned about and how to fix it.

Firstly, I am not making the requested boost. My first thought was a boost leak but you can see that from 3000rpm it makes the req boost fine before tailing off, however the wastegate duty cycle seems to correlate with req boost so perhaps there is a small boost leak? No doubt if there is it will be very hard to find if it only occurs at 16psi. 

The afr tracks pretty well, but there are a couple of lean spikes and im not sure if this is acceptable or if action needs taken on the map?

Fuel injector duty cycle has a dip at 6000 rpm, could this be an injector on its way out?

The log shows ignition retard on cyl 2 and none for the other 3, im not sure how to analyse this, any thoughts?

I have data from another 3rd gear pull, no dip in FIDC at 6000 rpm, but actual boost exceeding req boost and a corresponding afr spike, again im not sure how to analyse this as I had expected the data to be very similar from both pulls (attached as run2)

Any input or advice would be much appreciated, thanks

Hey overall looks good! I would say Boost Desired is too high at the higher revs, that why you have the gap widening, although you could easily get 20 psi earlier and therefore you may achieve higher boost around the 5K rpm mark?? PLease note, I'm still fairly new to this though!

I have BAM 225 also but with downpipe and decat. I have a much more aggressive tune (stage 2 ish) and getting around 22 psi peak, but can't maintain for long...by 5.5Krpm its around the 18 psi mark - Ko4 just can't maintain high boost levels after 5K rpm. Reckon you're probably more than ok with stock injectors at this power. I had mine up to 95% duty cycle at 22 psi before switched to 550cc and uprated fuel pump (not essential though).

I think my MAF must be under-reading as mine only goes up to 205 g/s whereas yours is up past 220 I think! Maybe you have a more healthy engine...

Yeah the dotted looks pretty much perfect in my opinion! Just got to raise it all a bit now (proportionally) and see what she can do  Don't take my advice though, I'll probably have bent a rod by end of this year lol

I altered the LXDRN curve a bit and did some more logging today, would really appreciate some critique of the logs to see if there is any scope for optimising, specifically the afr spike around 3000 rpm, can this be adjusted out? Also not sure if the wgdc looks normal up the higher end of the rev range.

Thanks 

Thanks very much for the reply nyet, a relief to hear that! Being a noob I don't really know what good looks like.

Would I add fuel using the KFLF table? I think im right in saying this is a correction/offset for the target afr, and because it's all set to 1 as standard it effectively does nothing to interfere. So by adjusting that I can get the afr to track more accurately?

Any thought on how much I can play with the ignition? I'm unsure how to gauge that. I'm in the UK and use 97 or 99 RON fuel.

Happy to be directed to a thread for some independent learning, cheers!

 

talking about request, which is LAMFA or BTS

Not yet, one thing at at time.. get request where you want it first, and see if you can get more timing out of the peak torque area.

Hi Guys

Looking at making adjustments to the timing now, I have altered the fuelling and the boost slightly again and confirmed no KR is occurring, EGTs are all well below limits, car drives really smooth and pulls well with no dodgyness.  I have also refitted all the N249 pipework and valve (it was the previous owner that removed it) and I'm glad I did as it drives much better!

From the advice above regarding increasing timing at peak torque and from the s4wiki: ' odds are you can increase timing significantly at the last load line and after peak boost. You may even be able to bump timing at peak boost as well'

I am just looking for confirmation that I have the right idea, from the log graph I have marked what I think is the peak torque area, but after peak boost, and on the KFZW table I have highlighted the 8 entries I think I can then increase.

Assuming I'm on the right track with what to change, what is a safe starting point for the changes? Do I take all 8 entries and add 'x' to them? If so, what would 'x' be?

Thanks!