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Ess_Three said:
I wasn't going to get 'involved' in this...but:
A few thoughts if I may...
1.
I am just not buying a 15ish BHP increase from changing an exhaust on a VAG car...I've never come accross such a gain on ANY VAG car in the past - NA or forced induction...the standard systems are pretty good standard.
Unless of course someone had shoved a large potato up your standard exhaust just before the before and after dyno testing....the figures in question were of coures done on the same day, on the same roilling road, under the same conditions, by the same operator, with you witnessing weren't they?
2.
I got precisely f**k all worth mentioning from my Milltek - as already mentioned...and only a few lb-ft from the cats...on a standard car.
Therefore, the change is probably not worth doing if you are looking for huge gains.
On a well chipped car there are definate advantages in having the cats & exhaust....but even when running upto 1.8 bar...there's not a 15BHP increase in changing the exhaust...sorry...I'm just accepting it.
3.
Audi S3 cats are a restriction...but not in the way we all assume...they aren't really a huge restriction in flow...but they will ment at the sort of EGTs that a heavily modified S3 will produce...melt the cats and you are up sh!t creek without a paddle. Think of them as an insurance policy.
4.
The S3 downpipes are not restrictive to any great degree at any sort of flow levels that the standard turbo and crappy exhaust manifold will allow...there's simply no need to change them.
5.
Rolling roads can be made to show any increase you want, given the operator wishes to 'adjust' some of the parameters.
But who wants a paper increase of say, 15BHP, if in actual fact you got 1.5 BHP...I can have my plots show over 300BHP if I really want...but who am I kidding?
Am I impressing the lads down the pub, or being realistic with myself?
I'll stick to genuine / erring on the side of pesimistic for my figures thank you!
6.
Seat of the pants dyno means absolutely f**k all. Do it properly, back to back with all the same parameters or the results are completely useless.
Even back to back testing is at the mercy of the honesty and integrity of the rolling road operator.
7.
On a well maintained S3 doing a TBA is worth nowt either...
Tried it, worth nothing...may feel better, but it's all in the mind. Test it .....you'll see.
8.
TBA = Throttle Body Alignment not Throttle Bodt Erase...the clue is in the letters...T B A!
9.
The restriction in the standard exhaust (under the axle) on the S3 does not significantly restrict the flow of exhaust gas on a standard car...so you just aren't going to see huge gaing from going up to a 70mm+ system.
Some gains, yes. Huge gains, No.
10.
Evidence in the UK from TT owners who run the Milltek without the centre box shows no real gains from removing the middle box...so that can't be the difference.
Of course, maybe Milltex just can't make decent exhuasts...but since the old MTM exhaust was made by Milltek, and the route for the Forge exhaust is the same as the Milltek (at the end on the day, there's only room for slight differences in the routing between manufacturers) I just don't see where one company can get 15BHP where the rest of the human race only gets between 1 and 3.
Strange huh?
Anyway...there are a couple of other things which may account for the differences.
Maybe the horses down under are of the partucularly weak variety?
Perhaps due to some glitch in the Matrix, physics works differently south of the equator?
Of course, these are my own personal thoughts and views and I'll stand up to be assasinated / insulted for making them public.
Oh, and my Milltek back box hange down at one side.
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1) Don't buy it, no one is forcing you too. Just because you have never came across those figures, doesn't mean its not possible.
www.ozaudi.com, go to the TT section and see what they have to say about changing their exhaust.
2) You must be ****** after outlaying large sums of $ for f*&k all difference /ubbthreads/images/graemlins/laugh_roll.gif
3) Its melt, not ment. Like TBA?
4) I never did..
5) Dyno is better than no dyno. provided same operator, same settings, same temps. No point in comparing if not done properly.
6) blah
7) According to you.
8) See 3)
9) It reduces exhaust gas velocity, it combined with the muffler and straight through piping produces good gains.
10) Makes me wonder why you guys buy exhausts if you don't get power gains.
