NefMoto

The car is 2005 Audi A4 B7 1.8T Quattro. The things i changed is:
- Turbo K04-064 from Audi S3 2.0tfsi
- Bosch 630mm injectors with 4bar FPR
- Maxspeeding rods 20mm with Pistons from S3 1.8t
- 3" downpipe with 2x2.25 pipes after that
- S3 1.8t Maf housing - 70mm

The problem is the car have a big lack of performance.I feel it like my previous Audi S3 with stock hardware and only tuned to 250hp. Now with car that weight almost same and a lot bigger turbo i feel same.The first thing that i found on my tune and already fixed was bad scalled MAF housing.Today i scaled it right with nefmoto tool and write it on the car.There is little or no difference than previous tune.I have log with me7logger and will upload it with my original tune and my last tune - after all the hardware changes. Please help, what causing this lack of performance and which things need to be corrected.Will upoad new logs if needed.Thanks.

I can't find anything obviously wrong with this log.

IS that mean the tune is perfect and this is the max of this setup ? I expected more power from this turbo.

Well your actual boost is a bit short of requested (you might need a bit more IMX), but you're almost out of WGDC so there isn't much boost left anyway AND you shouldn't be requesting anything near the MAP limit (i assume this isn't a 5120 file)

You're also riding KR at -3deg, so no room left for timing.

The only thing you have left is some injector DC, so you could add fuel and see if you can get timing back, but at some point you'll just be puking black smoke.

Uhmmm....

What about 0.85 lambda and 6 deg ignition at revlimiter.
I think one pull to 200-250km/h and the engine will melt.

There is no power because there is way too much boost for the compression ratio and there is no timing. And it's way too lean.
-15% lambda trim etc etc.

Also makes me think OP didn't tune it himself either.

Welcome to 91oct tuning.

Well, except for the bad trims.

@nyet Yes this isnt 5120 file.I have boost meter in the car to check if the pressure goes above 1.5bar.

@prj What should be the timing and lambda on revlimiter ? Is this the only place where it need to be changed ?

The tune is made by tuner, not by me.Im newbie and now learning how the things works.The scaling of the maf is my first thing that i done to my tune.

For completeness you should fix your trims. But you aren't going to pick up any power.

For which map need to look? Thanks.

Log ps_w

Made 2 logs.All previous map + ps_w. First Log is 3rd gear to redline. 2 is 2nd full, 3rd full + part of 4rd.

Is ps_w good ? Where i need to enrich ? From 4500 till end ? And how much ? 0.5 or less ? Can somobody help with fuel trims

your MAF is underscaled

I used MAF scalling tool here in Nefmoto to scale it.Older housing was 60mm inside diameter and now i am with 70mm.

Still not good, scale it more... ps_W need to be below boost presure(you have all description in wiki tuning, read it several times i sugest you)
If you dont have boost leak

Will made it 60 75 and new log

I don't care what it's being tuned on. Running 6 deg at rev limit with 1.5 bar boost is just asking to blow shit up.
It will probably make more power with way less boost too.

Ah well, whatever.

usually the tradoff is around 12-15 deg, also IAT limited to some extent. Also why big turbos are a complete waste time for high compression motors on pump gas.

@prj what you recomend to start with ? Lower boost to 1.3 ? Enrich the AFR from 3000 till redline ? Which is 6 deg ? Ignition before TDC ? What should be
@nyet On my logs IAT is not going above 40C. Isnt that good ?

Could water/meth injection help ? I have AEM kit sitting at the garage but not sure is it worth to install it.

Made some changes and now looks better on logs i think, but still pull timing over 4k.Next step will reduce boost to 1.2-1.3bar and log again to see if ill get better results.Now car feel very good up to 4500rpm but after that losing power.What timing should i change ? How is the tune now ? Thanks

Yes your boost is too high. Dont go over 1.5 bar req. Stick to 1.4 taper to 1.2 or 1.1

You'll find that if you pull boost and allow / add timing,you will make power than with additional compressed air. timing should be above 20 at 6k I think on 1.8t( course if fuel allows)

So first thing to do is change LDRXN and try first with 1.3bar boost. Do i need to change other maps or only from LDRXN ? Already scalled just a little bit more my MAF and now ps_w is together with actual boost.Will scale it with 1mm down, so ps_w will be just bellow boost.
 
Edit: I will change KFLDIMX last value from 1500 to 1300hPa

Changed LDRXN but up to 5500rpm i still have 1,5 Boost (Desired and Actual) i dont know why.Checked LDRXNZK and it was same as LDRXN before i change it - was 2 same maps.Now ill change LDRXNZK to be 10 or 20% less than LDRXN. Do i need to change something else ?
When i see the logs i have two question.
Why AFR is go together Desired and Actual only to 6k rpm, than after that Actual goes to 10.8 when Desired is 11.6 ? There is no big changes in boost there
Why EngineLoad(actual) has up and downs ? Is this normal ?

You are still requesting way too much load.

Lamba is going super rich likely due to a boost leak up top.

Lower your LDRXN to smooth out your req boost curve from 1.4 to 1.1bar and to have a nice maf curve.
While doing logs make sure to hit full throttle at 1500rpm. Your last log starts at 2500rpm.
Post your lamfa or what ever map you use.

attached two logs from amk engine with same turbo

Thanks for advices, will check them after work.
And this is my LAMFA map

Things got very complicated. I changed LDRXN only to request 190 max (1.2bar boost) and on last log i have a lot of changes:
1.Boost Pressure desired has start with 2.4mBar than goes to 2.1 and after that go up to 2.3. And this is Requested.Dont know from where it sees that i want more than 1.2bar.
2.AFR Desired is 11.9 all the way up to 5600rpm than goes little bit richer to 11.6. And this is without touching any fuel maps ...
3. Timing is a bit better. On the first run i have almost 0kw all the way. On second i have 1.5 on two cylinders.

That requested boost doesn't bother you?

It is.Im wondering from where is this map ? Its very different from what i want.
Edit: Maybe i should change KFMIRL map ?

Pretty sure this guy is trying to edit a previous commercial tune if he doesn't even know how boost works.

AFAIK posting commercial tunes is against the rules here.

you should ditch the tune you copied from somewhere and start from scratch from a stock file.

I didnt copied the tune.Its not made by me and thats not a secret.A friend of my friend made a tune for me, after i changed turbo, injectors and other hardware stuff (before  1 year), but he tell me that he cant do anything more and its maximum.From 2-3 weeks im learning these stuffs.Want to fix it by myself, and thats why i make small steps and do it map by map, not a lot of changes for now, but im trying.Changing something, then make logs and trying to find out what can be done better.Last tune with the bad boost request was my fault.On LDRXN i didnt changed last two columns. Today i fixed this + found Me7 Wizzard.With that tool i fixed KFMIRL, KFMIOP and LDRXN map.Wow i like driving another car with that changes.Better responce and power on low rpm now. I will think about next step. Soon i think to calibrate my Wastegate with LDRPID Tool when i found which maps i need to change and take logs.

So i decided to go alone from the Original File and leave that messy tune. Started with MLHFM, KFKHFM, KRKTE, LAMFA, Temin, Teminva, FKKVS, KFB. I will check how is the fuel now and proceed with - KFMIOP, KFMIRL, LDRXN, KFZWOP/2. Any recomendation and advices ?
@nyet Should i post here on progress or start a new Topic ?

Keep it here, please :)

Today made the fueling tune with Maf scaling.Most of the maps are copied from previous tune because the car followed, what ecu requested. Sometimes i have bad cold start but dont know from what.STFT and LTFT are lower than 5%. I did some logs and fuelling looks good(Now it was richer for safety, will correct later), so now i will go next to KFMIRL, KFMIOPS and KFLDHBN. Now i have some questions:
- When i compare now i see on the old tune KFLDHBN was 3.98 everywhere, so i thing it were like that to disable it and use only LDRXN map for controlling load. Am i right and is this a good idea to make it like that on the new tune ?
- Can i make TABGBTS to 1200 so i can use only Lamfa map ? Or make it 950 for example and use a little bit richer KFLBTS ?
- Do i need to change KFZWOP/2 maps. On the last tune I see that KFZWOP and 2 are exactly like on original tune.

Thanks

You can set things up any way you want; limit boost by PR or by load request. Up to you depending on goal

Also up to you depending on what your fueling goals are.


No, do not touch KFZWOP

Limited boost with LDRXN but still car wants 2400mbar at the low rpms.Dont know from where it see that Desired Boost.
Same story with Desired AFR. I made TABGBTS to 1200 so i can use Lamfa map.But on the logs i see Desired AFR is some values that isnt in Lamfa map.What im missing ?
My actual AFR was a lot richer in last tune without any changes to Fuel maps.Can be because i didnt waited to made trims ? I went to the logs 1min after i flashed the latest file.

Edit: Also i think about KFKHFM map. Its for "fix up individual rich/lean areas, and WOT fueling issues". So if i put 1 everywhere shouldnt have any correction on AFR ? And why on stock file its already modded if im right about previous ? I see that after 129% all row is full of 1. Is that mean that i wont have correction after 129% load ? I really dont know how to make car to request exactly AFR values that i want.

I can't make head or tail of what you posted.

1) you want plenty of boost req during spool so you have 95%
2) everything you said about AFR is wrong, so I'm not sure where to start to give you advice