Intake temperatures

[A80Avant]

Can someone who has done the tests using VAG COM tell me at what intake temperatures the ECU begins to drop boost or reduce advance in order to avoid detonation?

Assuming that the fuel is 99 octane and chekced,the next possible area to check would be intake temperatures(assuming again there are no leaks etc.)

thanks
Vasilis

[A80Avant]

Ok,did some tests today after i rewired the plugs so that i can have the laptop in the car and the cable permanently there.Since my mechanic doesnt use that stuff,im the only one that does,so more help for me!

SO Lets post our IAT from the VAGCOM people!!! I will start

Ambient temperature(as measured from the car's temp sender)--->i use this one as reference even though it is not always accurate so that we can all have same values.

Temperature measured at the block 3 of vagcom,last of the 4 measurements done in that block.

IAT 1---------->temp when warm driving casually

IAT 2---------->Temp on WOT on 3d gear

IAT 3---------->temp on WOT on any other gear anyone can measure

IAT 4---------->temp on WOT with water injection(or any other modification.Please mention the modification!


Here are my results:

Ambient temperature: 27C
IAT 1: 32-35C
IAT 2: 36-42C
IAT 3:couldnt measure due to traffic!!!
IAT 4:28-30C water injection spraying in an augmenting pattern from 0.8bar to 1.8bar(min-max)

I must say that i was amazed with the results of the water injection,and also the results of the intercooler itself.however,after reading about the fact that the S2/RS2 ECU has a way of dealing with boost in order to keep a leveled power to the car depending on the IAT and ignition timing,i really wonder if i can override this function.In the summer,i will have WI anyway,and in the winter i dont need it,so i could get away with having a good overall IAT to take advantage of the ignition timing settings...what do you think??

[Jamo]

Consider also the ecu also takes into account altitude as well so as not to overspin the turbo.

[A80Avant]

oh i forgot that.Im at sea level...sea was right next to me actually!!

[EspenW]

PapVas: This water injection, of which you speak, I assume it is water spraying into the intake manifold/throttle body, and not an intercooler spray? Do yo have a link to the setup?

[A80Avant]

it is a intake manifold spray.Im spraying excactly opposite of the throttle body and the product i bought was from snowperfomance.Also another manufacturer is aquamist(a bit more expensive)

I have a kit that produces a climbing spraying effect depenting on boost level.It gradually sprays more water as boost climbs from 0.8bar to 1.8bar after which it tops the spraying volume.Volume depends on water injector size.

[EspenW]

Interesting. I'm surprised to see IATs so close to ambient temp. The intercooler obviously does a good job Stock RS2 intercooler?
I'm guessing that you don't have a Hot-Air-Intake (tm) aka. open filter

[A80Avant]

intercooler is bigger.custom made.core i believe is 550x300x60 if i recall corecctly.
it does a really good job.

now that it has gotten quite colder here in Greece,WI doesnt seem to be as effective though,which matches excactly what i installed it for.however i didnt take any new measurements,i was just watching EGTs this time and there was no big difference.In one time there was even a rise in egt's but then i noticed that the boost was not 1.3as it should but climbing to 1.45bar

Also i use RS2 airbox with KN filter.A little modification i did was to transfer as much air as possible towards the filter(that day at the photo) while shutting all other pathways away from the airbox.This way i could maximise the incoming air.There more solutions though but for now it seems ok.

[A80Avant]

final result upper

[A80Avant]

lower end result

[A80Avant]

third tube only goes as far as the turbo....just to guide some fresh air there too

[Welleh]

sorry to hi-jack thread with a random question, but what bracket are you using for you're oil cooler??

[A80Avant]

what do you mean,what bracket?for mounting it?

[Welleh]

yeah the mounting bracket, just had a closer look at the pic and it looks like its on the chassis! is that right? have you ran the pipes from the bottom?

[A80Avant]

yes pipes come from the bottom.Mounting is from 4 screws on top and a small metal bracket on the bottom as well.Unfortunatelly the trailor jack was removed for the fitment of the bigger oilcooler so i can only be toed away from the rear one.