Safe boost level

[beachsleeper]

Can any one tell me what is the standard boost level on a 2003 wrx. Also what are the safe boost levels if I run with a full decat and a boost controller.

[bob]

Boost Targets & Fuel-Cut Limits

WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi



WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi.

UK/Aus/Euro ECU's V7, 7D and 6D - 11.47psi, dropping to 9.47psi at 6600rpm. With Fuel-cut @ 14.87psi

UK Prodive ECU - 13.33psi (peaks to 13.64 @ 5600rpm, drops to 12.71psi @ 6600rpm). Fuel-Cut 15.65psi.

STi RA (1996) ECU 7K - 13.17psi (peaks to 13.64psi @ 5800rpm). Fuel-Cut 15.96psi.

WRX Wagon ECU V9 - 10.55psi dropping to 6.84psi (starts to drop @ 5000rpm). Fuel-Cut 13.79psi

Z4 and UK Prodrive map are near identicle, with the Prodrive Map running slightly more boost.

Boost cut will feel just like switching off the ignition for a few seconds when you are at WOT.
It is not a good thing for the longveity of your engine and is best avoided.
When the engine boost exceeds a predetermined level it occurs to protect from overboost.
The boost on an engine can/will increase with certain mods. eg. ported headers, different exhaust system removing cats etc.
You should have a boost guage and AFR meter before raising boost IMHO. A knock link is also advisable. The engine needs more fuel with raised boost and if it is run weak there is a distinct possibility of wrecking the engine.

Do not confuse boost cut with fuel cut which can be experienced when there is little fuel in the tank.(esentially they are the same effect) Fuel cut can be experienced on hard acceleration or long hard right hand corners where there is insufficient fuel to cover the pump pick up. Again this is a BAD thing.

Fuel cut defenders are available for around £100 or an electronic boot controller with FCD for £140 but do not go raising boost without heeding the above.

Has the boost controller you are getting have a FCD? I would run the boost at 1.2 bar and would put the car on a RR like the AJ's one that gives read out of fueling and boost. I'm sure Alan will help set this up to get the best from it..

[beachsleeper]

Im not up for running more boost than standard. I just want to run the scoob on standard boost. Im just a bit worried if the car overboosts with the full decat. This is why i want to fit the boost controller. hopefully to stop over boost.:smile:

[scoobyDAZZA]

get it mapped :)

[beachsleeper]

get it mapped :)
:j_sad: Oneday.:smile:

[bob]

Whats the car boosting at now fueling was ok at interpro so hold it at about that...:cool:

[beachsleeper]

Whats the car boosting at now fueling was ok at interpro so hold it at about that...:cool:

I think it was about 1.1 bar. Bob.

[bob]

I would put it at 1.1 bar then.. Then on the next RR get them to test it on 1.2..:wink:

[beachsleeper]

I would put it at 1.1 bar then.. Then on the next RR get them to test it on 1.2..:wink:

Had a play tonight. Boost was hitting 1.3 then quicky dropped to 1.2 and then stayed steady at 1.2.

[bob]

Always get a small spike like that no matter what you use... Mine spikes at 1.4 then hold 1.3.