2.5 XT PPP loss of power - Subaru Forester Owners Forum
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post #1 of 22 (permalink) Old 10-15-2008, 09:01 AM Thread Starter
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2.5 XT PPP loss of power

I have had the car for about a month and recently I have noticed there has been a big drop off in power. Bought the car from a Subara main dealer and they say it is all down to the fuel I am using.

I have been alternating between 95 and 99 ron but the car feels like the turbo has been disconnected almost like the air mass meter has failed. The dealer has recommended I run two tanks of 99 ron to reset the ECU. I am not convinced as I used to own an Audi S3 with 300bhp and if I used 95 ron there was a difference in power delivery but nothing like this.

The car has been into the main dealer bodyshop for some small repairs and my first thought was hat they disconnected the battery and he ECU has reverted back to factory spec.

Any thoughts as to what the problem may be?

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post #2 of 22 (permalink) Old 10-15-2008, 09:28 AM
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I would reset your ecu,take the neg terminal off your battery & let it sit for about 30 minutes.Reconnect & take it for spin.


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post #3 of 22 (permalink) Old 10-15-2008, 10:41 AM
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As the dealer says try running it on a couple of tanks of 99RON. Your ECU should advance as well as retard so you shouldn't need to reset the ECU, however it would be a quicker way to see the difference. The PPP is mapped for 97 ron so 95 will make a difference.

97 JDM S/tb with a proper gearbox ;)
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post #4 of 22 (permalink) Old 10-15-2008, 11:09 AM
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If after resetting yer ECU, you still have a power loss, give me a shout.


I may have a cunning plan.


REgards


Alan MaC
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post #5 of 22 (permalink) Old 10-15-2008, 01:08 PM
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Sounds like typical dealer garbage. Would it be worthwhile contacting Prodrive for their opinion on the fuel/power?

Max.

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post #6 of 22 (permalink) Old 10-16-2008, 07:54 AM
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I may have a cunning plan.
More cunning than a fox who's just been appointed Professor of Cunning at Oxford University?

Or is it something to do with the number of beans you have in your hand Alan?

01 Silver S-turbo, now with added H&S burble... ;-)
06 WRX WRC blue Impreza wagon with PPP...

Last edited by Telemarker74; 10-16-2008 at 08:55 AM.
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post #7 of 22 (permalink) Old 10-16-2008, 08:49 AM
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Does it involve a turnip?

97 JDM S/tb with a proper gearbox ;)

Last edited by Mark CSC; 10-16-2008 at 09:02 AM.
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post #8 of 22 (permalink) Old 10-16-2008, 11:03 AM
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Could do.

If yer man still has a power loss, and gives me a shout, perhaps I can offer a solution?>>>>>>>>


Regards


Baldrick MaC
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post #9 of 22 (permalink) Old 10-28-2008, 01:21 PM Thread Starter
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Quote:
Originally Posted by bampy View Post
I have had the car for about a month and recently I have noticed there has been a big drop off in power. Bought the car from a Subara main dealer and they say it is all down to the fuel I am using.

I have been alternating between 95 and 99 ron but the car feels like the turbo has been disconnected almost like the air mass meter has failed. The dealer has recommended I run two tanks of 99 ron to reset the ECU. I am not convinced as I used to own an Audi S3 with 300bhp and if I used 95 ron there was a difference in power delivery but nothing like this.

The car has been into the main dealer bodyshop for some small repairs and my first thought was hat they disconnected the battery and he ECU has reverted back to factory spec.

Any thoughts as to what the problem may be?
Thanks for all the advice everyone. Spoke to Prodrive and they said that by using 95 RON the ECU will disable the soleniod valve that controls the turbo boost. Basically it was running as a non-turbo engine. They advised me to disconnect the battery for 2 hours and then see what happens. Got my car back!
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post #10 of 22 (permalink) Old 10-28-2008, 01:48 PM
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That's an interesting safety measure that I have never heard of, certainly puts paid to the 'blowing engines up due to incorrect RON theory'.....

...though as I said, never heard of that before, and who did you have to sleep with at Prodrive to find that out


Seismic hero, finding black gold to fuel your fozz
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post #11 of 22 (permalink) Old 10-28-2008, 02:14 PM
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Hi Mark, where about in the World are you now?


Regards


AM
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post #12 of 22 (permalink) Old 10-28-2008, 05:35 PM
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North Sea... brrr

Seismic hero, finding black gold to fuel your fozz
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post #13 of 22 (permalink) Old 10-28-2008, 10:03 PM
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Its not unusual to wind back the boost when excessive det' is detected, but wastegate will still be at least 0.4 bar I think, so not N/A.

Quote:
Originally Posted by marky9074 View Post
North Sea... brrr
Still off Dogger bank then? Chilly here as well, 2" of snow yestereday afternoon...Brrrrrrrrrrrrrrrrr

Simon

98 s-turbo now breaking for spares :icon_cry:, now driving a BMW 320D M-sport :raspberry:
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post #14 of 22 (permalink) Old 10-29-2008, 08:06 AM
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Crikey,

You get around.

AM
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post #15 of 22 (permalink) Old 10-29-2008, 08:20 AM
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Me, that was Warwickshire!

India later this month, Turkey next, probably Italy in the new year, sounds nice but a total PITA!

Simon

98 s-turbo now breaking for spares :icon_cry:, now driving a BMW 320D M-sport :raspberry:
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