dynamix

iTrader: (3)

thanks Zen for clarifying this.

all I know is that it goes superbly

ricardo

Agreed.

I think I was trying to illustrate the uncertainty in 'wheel' and 'drag' numbers for the 'we always add 24%' people. If only the Americans didn't keep quoting 'whp' numbers...

Leeroy

Is the centre section TSL and if so how much approx. - I can't seem to find it on the website?

davedipster

Why don't we all start quoting wheel Hp then?

Gary C

Because it looks like the whp numbers depends largely on the Dyno and the setup. Ie the same car could give very different whp values on different dyno's with the same flywheel figure.

The operators calculate the losses with the 'coast down' test to arrive at a more comparable flywheel figure.

At least thats what I have surmised.

dynamix

iTrader: (3)

TSL centre section yep

http://www.tsl-motorsport.co.uk/news...0008&detail=36

not all of that fits mine cos it has a jdm downpipe on the 06 version

Leeroy

So would the centre on its own make much difference to the sound/performance - I seem to remember hearing this bit is the main reason for the MY06's lack of noise?

wideybrook

Its a shame that your car wasn't tested on the dyno in question before modification, on a dyno dynamics run recently in Plymouth a standard MY06 STi was only 0.5 bhp off the factory figure.

bigknd

Actually it was slightly higher at 280bhp & 300 lbs Will be interesting on my next visit now that PPP is fitted

T5NYW

iTrader: (4)

Torque is good, as would be expected on a 2.5 let us know when your new results with PPP

Tony

Bob Rawle

That amount of loss is too high, take the paw fig and factor in a 26% loss (maybe generous at that) and you get about 270 bhp which is more like, Maha rolling roads always exagerate losses (or seem to). Run with the diff locked it would be even lower.

cheers

bob

Daniel-S

Intersting

dynamix

iTrader: (3)

indeed - if it was just my car that was showing over the odds figures then all well and good but there was 24 cars in total (see Banzai mag this month) from ScoobyCity, most were at or slightly less than previously recorded figures on this set up and other more well known set ups

whatever happens my bum dyno tells me what i need to hear - just thought people would be interested in seeing the power curve for an 06 2.5 - it aint the peak figures that count afterall, it is the area under the graphs.

bigknd

Not sure when the next one is yet but will do Tony

Joggerboy

I've fitted the TSL deresonator and prodrive backbox to my o6 STI (UK) and what a difference - it sounds amazing!

When you look at the size of the actual resonator then it's no surprise that the good old fashioned burble has gone from the new cars!

Not changed the filter or done RR yet so not sure of any performance gains!

Getting the burble back is far more important!

dynamix

iTrader: (3)

agreed Joggerboy - the lack of sound made me ring to book it in within 2 days of having the car to change the backbox and resonator section.

With them done it sounds beautiful, slightly deeper sound than 2.0L STi i had before and power was def up as shown on the dyno sheet.

onwards and upwards

markmarkymark

picked up my black STI PPP on Friday - still running in (had the PPP fitted from new as I do not have the time to have it off the road for a day to fit PPP later).

I have commented on another thread of my own how good it sounds (obviously have the PPP back box). I assume that the PPP conversion keeps the resonator in (what the hell is it???). If so would be interested in the difference between your car and mine (from noise perspective!)..

Mark

bigknd

Mark the resonator (middle section) is replaced when ppp is fitted as well as the back box hence the return of the burble

markmarkymark

arrhhh thanks - tis why it sounds so nice then

cheers

Mark

dynamix

iTrader: (3)

it is a silencer that looks like a snake swallowing a piano approx halfway under the car - really restrictive and robs performance and sound.

davedipster

From mike wood...

<snip>
The main reason the 06MY is quiet is the new centre pipe fitted (the same as 05MY JDM actually) which now has a very free flowing silencer that is shaped to fit the floorpan in order to get the maximum volume in the space available. <snip>

This center thing is not restrictive then, it just makes it quiet.

dipster

shadower

My06 sti 2.5

also got 315bhp with green filter and decat
now it is mapped and a td06 hybrid turbo its 380bhp and 382 torque

so 315 is poss with no map

dynamix

iTrader: (3)

still, a worthwhile restriction to remove

the std backbox is awful too - so best to bin that aswell

dynamix

iTrader: (3)

I know, but some people dont believe dyno results

DeltaDash also concurs with the dyno sheet readings.

Have you done anything to the bottom end of the engine as I have heard that increased boost can throw the pistons on the 2.5 - what boost are you running?

shadower

mapped by paul at zen

he held the boost back to 1.3 bar max
says when we change the pistons and rods next we can crank it up
but until then he says itd dafe as it is

Tone Loc

iTrader: (1)

My resonated centre was not changed, it was the back box and the second CAT section.... the resonator is in the long bit from the CAT to the backbox. That's on a MY06 WRX PPP, is the STi different? I thought not?? Only two sections of the exhaust changed as per the WRX leaving the standard downpipe and resonated centre (classics had 3 sections not 4)???

See here for diagram... Exhaust

Tony.

dynamix

iTrader: (3)

looks good - would be interested to see a dyno print of this if you have one - you can pm me if you like (swap you for mine )

marmski

Am i not right in thinking running an Impreza with a change induction and exhaust without a remap is likely to cause heavy damage to the engine?

Not sure if its the same on the 2.5, but a friend of mine done this on his Bugeye 2.0 STi and ended up with a rebuild about 1500 miles later.. cause apparently down to the fact he decatted and changed the induction without remap.

bigknd

Tony,

Def changed the centre section (the flat waterbottle bit) and back box on my STI when PPP fitted. This is what Mike Wood quoted back in April on the subject
"To clear up the parts changed, WRX and Forester are rear cat removed and replaced with a silencer, new rear silencer, high flow intercooler hose and recalibrated ECU. STi doesn't have a new intercooler hose as it already has a proper hose but it does get a high capacity fuel pump. None of the cars have a new downpipe and main cat as it's not necessary at these power levels. More power would be achieved by changing the downpipe on the STi but we haven't done sufficient durability testing to prove that out yet."

Tone Loc

iTrader: (1)

The bits i've put in bold are what i have had changed, so i totally agree with Mike (who wouldn't ). The resonated centre section sits in between the rear cat section and rear silencer... see the diagram in the link i posted.

So PPP cars have OEM cat'd downpipe, PPP rear decat section, OEM resonated centre section and then PPP rear silencer.

Its the OEM resonated centre that could also be changed along with the PPP parts to gain more noise... not sure how that effects things such as warranty

Tony.