Hi Rich

The later subaru's (I know the MY00 turbo's had this) have a built in roadside emissions test function, where if your in second gear for more than xx seconds it puts it into this mode, basically reducing the emissions so they pass, but also knocking back the boost, works fine in 3rd though if you change up??

Tony

 

Given the symptoms, the solving has already been ably dealt with by Mr Burns.

If you want to rule out your query re. MAP sensor (etc) then log it and see what's happening, but in the absence of any further info, and given that you say lifting the throttle and going back on immediately clears it, Tony is probably on the money.

 

interesting...

it does only seem to do it if I'm in 2nd driving along and then plant the throttle, which ties in with what Tony is saying

any way to get rid of this?

 

Can be disabled completely via a remap - although you should check with a Tek mapper to ensure they currently have the ability to switch it off.

 

I won't be going down the remap route for the forseeable future as I'm happy with the car as it is with the Prodrive ECU, so I'll just have to live with it I suppose

plus now I know about it, I can avoid holding it in 2nd for too long so it doesn't do it

thanks for the help folks

 

out of interest...

does anyone know how many seconds it is?

is that just when in that gear or do you have to be off boost or below a certain boost as well?


just trying to determine under what conditions it does it, then I can avoid it happening

 

Years since I looked at it and I don't have the relevant info to hand (or in head), but from what I recall there are about four different parameters that have to all line up to trigger it. Road speed between a and b, rpm between c and d, throttle opening angle between e and f, boost pressure (or maybe solenoid duty) below g, and all of the above true for for h seconds otherwise the timer resets and starts from zero again, you get the idea. The whole point of it is that it's supposedly difficult enough to trigger so that the test driver will be able to do it deliberately but end users won't notice it. Unfortunately, as you've probably found out, sitting behind traffic in second while waiting to overtake is a perfect way to do so.

Timer value (i.e. h) is in the region of 6 seconds if I remember right, but that'll be based on the JDM STi ECUs, I would presume the PPP one is the same but couldn't swear to it.

 

yeah, that's the sort of scenario, in 2nd waiting to accelerate, then go to do it and get less power than you expected

thanks for the info though