Prasius

iTrader: (1)

Just a question specifically to other '02 STi PPP owners, as I've read the PPP ECU mapping isn't as 'aggressive' as it could be - Have you had another remap since getting the kit fitted? What sort of power increases have you seen?

Thanks for any feedback on this,

Ian.

Andy.F

The PPP does an excellent job under the circumstances. It is a plug-in upgrade that is designed to work anywhere in the world and on various fuel grades.
If you have the luxury of being able to map specifically for the UK climate and (preferably) 99 octane fuel, then there are significant gains to be had.
One of the best additions would be a fully decatted exhaust system as even the PPP system is still a relative restriction.

Andy

Prasius

iTrader: (1)

The only time I'd ever fill it on anything other than 99 is in a serious emergency.

I appreciate the advantage ditching the cat would have - but power vs. practicality, I'd rather keep the cat for now.

But getting the ecu remapped as the engine stands would likely (I know these things arn't a sure thing!) provide significant enough increase to justify the cost in your opinion I take it.

Andy.F

My opinion could be considered to be biased Best to wait for others opinions.

Andy

MikeWood

Bit of a common misconception here but the cat isn't restrictive at all. How can something cause a restriction when it's got a surface area of 4 x the pipe after it with about 15% blocked by the substrate? If you care to measure the back pressure at the turbine outlet there no difference with or without the cat in there.

Fitting an exhaust with less back pressure, basically a 3" system, will remove boost control at higher rpm as the wastegate can't flow enough to stop boost creep. Lots of power at high rpm but a turbo that's out of control and can't be pegged back if the ECU needs to.

You are totally correct in stating that the PPP calibration isn't as aggressive as it could be but there are lots of reasons for that, mainly that we want everything to see out the 60,000 mile warranty period, even if all the performance is used all the time in poor conditions. Pushing it harder may reduce the durability of key components and we aren't happy with doing that but other's may be.

Mike

dynamix

iTrader: (3)

Mike - can you ellaborate on the 3 inch system issues please?

davedipster

It does surprise me when I see ppp cats for sale on here. Why remove it? in fact the better after market tuners are fitting similar for mot reasons.

MikeWood

dynamix

It's pretty much as I posted, if there's too little back pressure, the wastegate can't flow enough to keep the boost under control. Even with 0% wastegate duty you will see the boost rising from 0.7 bar to over 1 bar at higher rpm in some cases. If the ECU had decided that it needed to turn the boost off in response to bad det (poor fuel/fuel surge/high temperature/any number of other reasons) it couldn't do anything about it.


dave
Frustrates the hell out of me as well. We spent a lot of time getting the spec right and to see them being sold/fitted to other cars means that someone has removed them from their STi PPP based on the premise that you have to decat to get more power. This only applies to the std downpipe, not a properly designed sports cat downpipe.

Mike

swifty.....!

iTrader: (4)

(Prasius) ian
as andy said there is gains to be had over the ppp and as you may not know he is one of the best mappers in the uk with the fastest impreza in the uk and europe i think. he also remapped my 05 sti ppp but i decated and went to a 3" turbo back exhaust and in wing induction and when remapped figures on delta dash where 357 bhp and 319ftlb backed up at recent rolling road where acheived 353 bhp and 318ftlb.

Recently on here i saw a newage sti ppp with just remap make 329bhp 300ftlb and by a well known company and this same company mapped same spec as mine and made simular figures to me so that kinda answers my question relating to the exhaust.

but there is still gains to be had over the ppp with just a remap as the map is set to your car so you'l get an increase in power and will also drive smother.

ste

fivetide

iTrader: (1)

Coming from the Supra i am amazed by the numbe rof people who remove the cats and then fit a restrictor ring inside the exhaust to prevent this overboosting.

To me it makes about as much sense as fitting an induction kit then adding a full closure heat shield - er... isn't that just a slightly less restrictive filter in an airbow like you had before? :/

m.

swisstonihasher

I run a full stainless 3.5" system from turbo with single sports cat...def no creep problems for me and that's with ecutek and Bob's magic. Currently fitting AVC-R for in gear boost control.

I'd not run without a sports cat...

dynamix

iTrader: (3)

I wouldnt decat without remapping though

New_scooby_04

iTrader: (4)

Just my two cents: I know several people -including myself- who have sports cats in the DP and are making figures that seem to be "on the money". Even those I have spoken to who are "pessimistic" about sports cats seem to be guesstimating only a few bhp loss over a decat (nothing noticable)

I suspect that if you buy a good un; it's not a big deal.

Personally, I don't think a decat is worth the hassle; I'll happily settle with a few bhp less if it means my car is fully road legal and no hassle at MOT etc..

Ns04

AndrewC

Are you using an unported VF35?

New_scooby_04

iTrader: (4)

Not really mate, you'd need to run the same car with the different exhaust; you may just have a good un'.

Andy was speaking yesterday of differences between cars sometimes amounting to more than differences between turbos e.g. VF35/TD05 16G.

swifty.....!

iTrader: (4)

know what you mean mate that you can have differences between cars running better than others. but was more of an example as to what most tuning companys say you can achieve with keeping ppp etc. for me having a decat is no hassel as i can just swop it at mot time in a year and a bit.

Prasius

iTrader: (1)

Thanks for everyones views on this!

The cars getting put on the RR at Clive Atthowe's tomorrow just so I know what she's putting out and ensuring there arn't any problems with sticky actuators and the like.

Mike - I assume that you work for Prodrive, so many thanks for your input! I appreciate that the PPP is made as an off the shelf solution, which has to meet Subarus specification and conditions in order for it to maintain the warranty, and as such isn't going to push the engine as hard as it could. I wasn't sure however, if there was much more to be had in terms of fuelling efficency, torque and, less important, overall power.

wayne's scooby

iTrader: (1)

swifty.... wrx sti or wrx sti ppp whcih do u think

swifty.....!

iTrader: (4)

depends on what you aim to do with the car if your going to keep it standard go ppp if your going to mod then depends what prices they are for sale! if simular ppp then you can easily mod from this but if your thinking of changing exhaust etc get a sti if you save on purchase price.

CYP_ROCK

I have a 02 sti ppp and got Andy F to map it and the difference was night
and day. The car was much better to drive, supper smooth and bags more
power ( 333bhp )

mark3evo

powerstation checked my PPP beforeremap and it gave 300 hp, left powerstation with 320 hp. can definitely recommend, both had same torque though still 300 lbsft