Audi RS2

[AVP]

Brilliant!! then you'll know what to expect when we meet!!

i was amazed how a little bit of pinging can reduce the torgue! I reduced the timing about 2deg, no pinging now, and wow! 600Nm of torgue!

[gunni]

Yesterday I was tuning a NA car. And hit some pinging, the power graph dropped instantly.
I´ve never seen pinging before on the dyno so it was funny to see it behave like that.

[AVP]

as an added security i have enabled the water/meth injection(small quantity,but crucial) to keep it under control. Although even without it it does not ping anymore.

[AVP]

it seems these days that i always have to readjust the boost as it keeps going higher and higher all the time.The weather is getting colder and i wonder if that is the case.

yesterday, on 6th, went WOT and it reached my fuel cut @ 316kpa again.

i will just reduce the offset today and leave it like that.

[AVP]

MAT temps are going from -1 to 14C with water injection on a 8C outside temperature!!  (up to 5500rpm)  niicee!!!

[gunni]

Can you explain and picturise your water injection and control method

[AVP]

water injection is snowperfomance, boost controlled via its own controller and a vaccum hose connected to the controller.

The Pump is located 2/3 from the bottom of the washer bottle tank, and the injector is located opposite the throttle body.

The water/methanol i use is less than 70/30, and the spray pattern starts from around 240kpa and tops off on more than 350-370kpa. In other words, i only spray a very small amount of the full potential of the injector and the pump, because i dont want the place flooded.

the only potential problem is that the MAT sensor is about 30cm away from the WI injector and part of the reason i see so low MAT is that the steam is that close. Ideally you need the injector further away so that it has time to mix with the inlet air coming from the intercooler.

The exhaust temperatures are not very altered, but at least this way i get less ignition retard on higher revs and more stable power.

i dont have any recent pictures, but ill show you when we meet!

[AVP]

a bit more leaner on the top end and some more measurements done, i managed to get the hp above 400 for good now!

EGTs are good within limits as well!

[AVP]

3d gear today!!!

same road, same more or less conditions, less downhill(1.6m)

[AVP]

and here is a holset HX40 (56mm compressor wheel,hence non Super40) on 3d gear, 1.3bar of boost and mild tuning settings

[AVP]

after a few trips i noticed that cruising speed with x amount of timing gave me a bit more EGTs than i would like for a long run. So i increased the timing a bit without any issues and vualla! Now i can run up to 3200-3400 rpm on 6th gear which is about 140-160kms with having 800C on the turbo hotside. That is acceptable i think cause it varies from 750 to 850 depending on the motorways, but at least it wont be more than that.

Before it was varying around the 850C area which i didnt like

[gunni]

what is the timing advance and load?

800C sounds high to me for cruising.

[AVP]

well cruising with 150-160kms/h is more than 85mph.
if i cruise with the limit of 70mph it drops to around 750C.

timing from 2500-3500 goes from 35-38deg on the 60-90kpa area (rougly) and the lamda is from 1.02 to 1 on those areas.

i know that 800 sounds high, but the EGT sensor is not on the downpipe,but on the turbo hotside,where the Exhaust manifold meets the hotside,so its the bottleneck of the exhaust system.

[GintsK]

Anyway it is a lot.
At 60Kpa you can advance significant more than 35-38deg. And 35deg at 100KPa and 3500 should be in the ballpark.
But it can be good idea to run little richer at 100Kpa.

Gints

[AVP]

Hi
you think? i might get it more than 38 then, and try it out. It still goes down on those timing anyway.

In any case with this small turbo, it is bound to have quite a bit more EGTs anyway. The next one should be much better.

When you say 'significant more' can you elaborate? such as, what rpm, what pka?

Mine start at 33 @ 2000rpm and climb to 40deg up to 4000rpm (more or less), Usually when im on 6th gear on cruising speed,i usually have from 60-90kpa and lamda as mentioned above. The EGTs esp when on cruise control are about 740-800C. (running at 120Km/h)

If i cruise at 150-160km/h then it would go to 800-810C. Now that i increased the timing it shoud drop a bit more.BUT to run like that i have to go above 3000rpm which i already have less than 1.00 lamda (3000-3500rpm lamda values go from 1.00 to 0.96).

I will do more fine tuning on the next setup anyway with the knock cable, but this is how the motronic use to work, which i tried to match. Of course there is always room for improvement.