WP Select Monitor

tomasek · Inscrit le: 18 Sep 2007 Messages: 5

Hello,

this is log from my 03' WRX.

Apexi exhaust without cats, decat up pipe, walbro fuel pump, stock TD04 , cold air intake, sti injectors, Ecutek software

I wonder why the turbo pressure is dropping as the rpm is rising, so the air flow remains almost the same... Does anyone know why this happens?

The log is on 3rd gear, full throttle from 3500 to 6600 rmp.

Thanks in advance.
Tom

frenchyyii · Posté le: Mer Déc 19, 2007 6:07 pm Sujet du message:

Hi, you seem to have a stock turbo on your WRX (TD04 if your model is european). Such a supercharger cannot maintain a big pressure at high RPM. Even if you try to overuse it, the flow will allways fall after 5500
It's quite normal and we can see it on your log.
So if your turbo doesn't charge after such a regime, your motor won't swallow more air (that's why the flow falls).

Also your mapper seems not to have chosen to maintain a big pressure after 5000, you have a quite big pressure until 5000 and then nothing notorious. He should have tried to maintain it a bit more, here it is more than safe.

Be careful, the pressure is an important point of interest but the Air Fuel Ratio and the Ignition Advances have to be optimized too !!!

A question from me now... why using such injors with your stock turbo ? Will you continue to upgrade your car ? Was it preventive ? 'cause you don't need it for the moment Wink

A probleme now, you should reset you ECU and control the MAI (IAM) because your one is stuck to 10 on 16.
There'a a way to help MAI rising up to 16, if you don't know it I can explain you.

If you can't understand something just ask Wink

Eric

Concerning the logs now...
Please now try to log from 2000 or 2500, we'll can take a look at your spool up phase.
Please, next log, try to use that format:
* no " as text separatory
* , as number separatory (on your it was Wink

* . as decimal separatory (on your it was ,)
Here is readable log with deltadash after i modified it

tomasek · Inscrit le: 18 Sep 2007 Messages: 5

Thank you very much for your answer Eric.

tomasek · Inscrit le: 18 Sep 2007 Messages: 5

frenchyyii · Posté le: Jeu Déc 20, 2007 1:02 am Sujet du message:

I'll try to answer everything (I didn't pratice English for a long time LOL)

Yes a bigger turbo will create more flow because it will be able to maintain a bigger pressure at high RPM and with better efficiency (colder intake air)
For example stock euro STI have a IHI VF35 mounted on, that supercharger is able to deliverate 280 g/s when used near from max.
The TD04 is only able of a big 250 and it blows hot at high RPM (less efficiency so)

If you want something reasonable a VF35 or better VF34 will be quite good as an upgrade for a WRX. Too much couple will damage your gearbox so keep cool on the pressure at low RPM. Wink

Your stock injectors were big enough for the TD04, it will be good till you join around 300 g/s

If you don't have it, you'll need to buy a high pressure and flow fuel pump (we usualy buy walbro 255L/h high pressure ones)

Concerning your air filter, everybody seems to agree that a stock one is ok (and does not damage your MAF) but keep it clean. For more than 350/400hp it's another problem.
Keep your MAF in good conditions too, it's more than important on our cars.

The MAI, yes it's the Multipe Advance Ignition. It gives us an idea concerning the knock the ECU detects.
In fact that's a purcentage of "maximum added advances" the ECU will allow to apply.
0 is 0% 16 is 100%. When the stock knock sensor detects to much knock, it automatically decreases the MAI as to concerve reasonable and non destructive advances.

When you'll reset, the MAI will begin at 8 (50% of the table will be applied). Then learnings will allow (or not) a rise.
But to save time you can speed up that rise. For that, just after the reset, begin driving without boost and with low throttle and RPM. Change quickly you gear untill the 4th one. When you are in 4th, you should be at low RPM then kick down continually and join high RPM. You should read 16 then. If not ...try again LOL
After, if the MAI can't stand at 16...there's a problem (too hard advances, a too poor fueling, or eventualy a metallic part vibrating that the knock sensor detects).