Stock DPs make more power than 3" DPs up top on the dyno. Say what!?

[Vol 4.0T]

s6

[bhvrdr]

I would take one dyno result with a grain of salt. I have seen 30whp differences on the same dyno with my car making no changes whatsoever. It really is a challenge to be accurate with a dyno.

It sounds like you are saying SMS did not tune at all for the downpipes, which could also be a reason they didnt see much of a gain with them.

Downpipes "shouldnt" be losing anyone power but they could be throwing off a non optimized tune so who knows.

We do know that others have seen gains, but again, who knows how accurate their testing is too...





I do agree with you that you probably arent picking up more than a tenth anyways judging by the professed gains of the downpipes so would it be worth it to delete the factory cats and make the car off road only? Not for me but thats a personal preference. I have a track car for doing things like that to.

Mike

[markreed]

Vol, just to be clear. You are stating stock downpipes with aggressive tuning should yield better results than aftermarket downpipes with a properly calibrated tune?

Sent from my SAMSUNG-SM-N910A using Tapatalk

[jsmonet]

That's a bolder statement than being made. Just from a reading comprehension perspective, what appears to have been said was that the gains in aftermarket downpipes are, in his experience, either marginal or nil.

[playwithonehand]

There are two issue with your statement:

1. Dyno, its really pointless to compare as too much variable from different dyno. Even with same dyno too much variable will affect the outcome like operator, the way you strap the car, dyno room temperature, health status of your car etc.

2. Tuner & Hardware, every tuner opeprate differently say APR for example they aim to provide the safest way to juice your car however they ain't the fastest/most aggresive tune on the market. They like to test the tune out for 6months to make sure everything is running fine then provide a retune 1.1 update. Other tuners liek GIAC, Untronic, Revo they like to design their stage1 as aggressive as possible however the margin for gain in their stage 2 is lower.

I know for a fact A5 2.0T, S4 3.0T and even golf R Giac always run stronger/faster than APR when doing highway pulls however we really don't know how safe the tune is unless if we log our car which 90% of us don't.

Hardware being the downpipe, Solomotorsport's downpipe is totally different design to unitronic, APR and AMS so their result will not be the same. You really can't use the argument that Stock DPs make more power than 3" DPs up top on the dyno just because they use different tune and hardware.

The only conclusive result is Solomotorsport's stage 2 file was not optimized for the downpipe, this doesn't mean all other dp will result the same as already proven APR and AMS both get noticable amount of gain from their downpipe and I think this was due to the design of their dp with is straight downard. You can see Untronic didn't gain much and this was due to in my opinion bad design of the oem cross path gooseneck dp with bottleneck the air flow.

I really wanna congradulate about your 11.0@123 with bone stock downpipes, this is pretty amazing as no one has done that however you did have some extra helps from other parts like E85, light wheel and drag radial which APR didnt have. Try running your stage 1 without E85 wheel & radial you probabaly be doing 11.4-5?

I am sure if APR decided to run light weight wheel with drag radial they will be into 10.7-8 with ease

No one will be able to change your believe but this is my personal experience, I test numerous times with my friends 2015 GTR black edition. Before downpipe he will always beat me by one and half car length, after my custom downpipe we raced over 8times and I won every single one of them by one car length. The is highway pull 60km to 130km not from dig.

Strange thing is that he still beat me at drag stripe 11.3 vs my 11.5

If you want the prove its in my youtube channel

[lnferno]

^ It could be a lot worse. Be glad you don't live at elevation where the DA is consistently 7300-8700.