cookstar

iTrader: (6)

I will be fitting a Dawes device to my 02 WRX this weekend, and wondered if someone knew what boost i can safely run at please

Only other mods include de-catted ( cat still in up-pipe) induction kit and an STi Top mounted intercooler

Thanks



Cookie

Jolly Green Monster

iTrader: (4)

How are you checking fueling and monitoring for det?

cookstar

iTrader: (6)

I am not,

Was thinking about getting knocklink fitted too, but didnt think this was necessary unless pushing too much

I dont want the absolute max, just a safe but noticable gain.

Jolly Green Monster

iTrader: (4)

I personnally wouldn't up the boost, you are already running different filter, different exhaust and different intercooler.. upping the boost is asking for trouble, especially with nothing to monitor it.

Go see someone for an ECUTek remap before you break it.

Simon

Neilo

i ran 1.1 perfectly fine on my 03 with a dawes, we checked it over with deltadash at the time of set up and there was no significant knocking at all.....so i would say that you could take it to 1.1 ok, but each engine is different. The spool up of the turbo will be quicker withthe dawes fitted though so the car may feel better just for doing that and keeping standard boost!

Neilo

i do agree with jolley though, it would be wise to have something to monitor it.

cookstar

iTrader: (6)

Such as?

I have a gauge pod, just waiting to be filled is this an Air/fuel mix one or something like that.

The pod has two spaces, so if you could suggest what ones that would be great



Cookie

Neilo

AFR guage or knocklink...sorry wasnt with it :P

Andy.F

You have to be carefull with the uppipe cat still in place. If you overheat this then it melts and bits fly into your turbo.
The standard boost profile is designed to reduce at high rpm (along with mixture enrichment and ignition advance) in order to keep the exhaust gas temperature in check.
If you fit a Dawes it will attempt to maintain a flat boost profile, this in turn causes the ignition to retard at high rpm and increases EGT to levels the cat may not accept.

Another matter to consider is that if the boost is increased to a level above the original then the ECU's internal memory of timing advance (to avoid knock) may be out of range. This doesn't mean your car will fail, just that instead of the ECU knowing from historical data exactly how much timing advance to use on full load, instead it needs to hear knock/retard/hear knock/retard, this can go on for long enough without the engine actually failing but its lifespan can only be reduced as a result.

During a mapping session, the ECU parameters are modified to ensure the new range of airflow/power is captive within the scope of the various course and fine knock memory tables.

Final point on the induction kit. If this has not been calibrated in the ECU then you can also run into problems. Induction kits alter the flow pattern of air around the maf, this maf signal is the primary load reference for the ECU, used for controlling boost, fuel input, ignition timing, knock control and various safety limits. If this signal is 'wrong' then the ECU doesn't know this and may not add enough fuel for example.
On full throttle, it has no way of knowing what the actual airflow is, some inductions alter this signal more than others......you pays your money and takes your chances !

I'd seriously consider the costs of the additional gauges/knocklink/dawes versus an Ecutek remap where the ECU is well capable of properly looking after everything even when tuned to over 400bhp

Andy