What further mods possible with ppp?
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Scooby Regular
Joined: Dec 2000
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i had my ppp done recently and i'm VERY pleased with the increased oomph. 
however, the car is TOO quiet now ( i had a full decat prior to ppp)
i need some noise back! is the ss backbox louder than the prodrive one? what centre section is used when u have ppp fitted? and what exactly is overboost, and what happens if it does?
i have a ss backbox, hks downpipe and magnex centre laying round with nothing to do. what bits can i put back on without causing problems?
like i say, i love the ppp, i just wish it was louder!
thanks for any advice!
however, the car is TOO quiet now ( i had a full decat prior to ppp)
i need some noise back! is the ss backbox louder than the prodrive one? what centre section is used when u have ppp fitted? and what exactly is overboost, and what happens if it does?
i have a ss backbox, hks downpipe and magnex centre laying round with nothing to do. what bits can i put back on without causing problems?
like i say, i love the ppp, i just wish it was louder!
thanks for any advice!
Scooby Regular
Joined: Jan 2000
Posts: 1,999
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I had a SS b/box, straight through centre section and d/p on my MY99 PPP - certainly made it louder
The centre section with the PPP is the STi centre - no cats, but has two resonators/baffles/silencers in which makes it more restrictive.
The centre section with the PPP is the STi centre - no cats, but has two resonators/baffles/silencers in which makes it more restrictive.
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Joined: Sep 1999
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Overboost is where the ECU detects to high a boost level (normally around 1.25 bar) and briefly chops the fuel to avoid engine damage.
The effect is quite a violent jolt, normally felt when you are booting it in 3rd or 4th.
Its normally caused by freeing the airflow (a Scoobysport back box and Ramair filter was enough to get my MY98 doing it).
The recommended dealer fix is a boost restrictor in a hose that lowers boost pressure although you will notice a performance degredation.
James.
The effect is quite a violent jolt, normally felt when you are booting it in 3rd or 4th.
Its normally caused by freeing the airflow (a Scoobysport back box and Ramair filter was enough to get my MY98 doing it).
The recommended dealer fix is a boost restrictor in a hose that lowers boost pressure although you will notice a performance degredation.
James.
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Joined: Apr 2000
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James H
Just a quick question - overboost. I am thinking of changing the dp to a non-catted type, with rest of system standard. I have been told that this will improve pick up of the turbo, great. However, if this is going to then mean possible overboosting problems (where a restictor will have to be fitted) then it seems like a pointless exercise to change the dp in the first place???
Spatch.
[This message has been edited by Spatch (edited 17 April 2001).]
Just a quick question - overboost. I am thinking of changing the dp to a non-catted type, with rest of system standard. I have been told that this will improve pick up of the turbo, great. However, if this is going to then mean possible overboosting problems (where a restictor will have to be fitted) then it seems like a pointless exercise to change the dp in the first place???
Spatch.
[This message has been edited by Spatch (edited 17 April 2001).]
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