MagneticBoost

02reaper

iTrader: (2)

Ecoboost engines are torque based and limit based. You wont see any gains from installing a catted or non catted downpipe. Gains from a tune would be the same, just gains from the tune itself and not necessarily the downpipe. The only gain you will or should really see is faster turbo spool.

w00t692

Downpipe WITH exhaust commanding the same torque my turbo speed to make that torque dropped by 20-30000 rpms on the turbocharger.

So technically it would allow me to command more torque and make more power at this point, but it did not add any power.

02reaper

iTrader: (2)

There was a brief discussion of this over here.... https://www.f150ecoboost.net/forum/1...-50rwhp-4.html

w00t692

Yes, this is also the goal of clipping the exducer wheel to increase flow and reduce exhaust pressure attempting to exit past it.

02reaper

iTrader: (2)

Looking at the stock downpipe and catalytic converters on my 2016 3.5, unless the cats are really restrictive, I don't see that as the real bottleneck in the exhaust system. To me the bottleneck is the 2.5" section from the Y to the muffler.

w00t692

Um, the exhaust is only 2.5" until the muffler where it goes out the back of the muffler at 3" So yeah... the entire midpipe section and resonator and everything else is a bottleneck.

02reaper

iTrader: (2)

That was something in the discussion over on the other site too, where all the aftermarket downpipes are 2.5" also at the turbo adapter but neck up to 3" the rest of the way, then back to 2.5" till right there at the muffler where it expands to 2.75".

w00t692

It's OD. I didnt' drop much turbo speed until i did that exhaust. It really is a bottleneck at least on a gen2 motor.

gen1's just don't make the same power the gen2's do.

02reaper

iTrader: (2)

Right, The 2.5"/2.75" part of the catback exhaust itself is where I think the most gain would be. I've been on the fence about doing the downpipe and atleast getting the 2.5"/2.75" section out and putting 3" on mine. I'm just not sure if the stock cats are really that restrictive or not. My intention is to keep the truck as quiet as possible because in my opinion the best sounding v6 is a quiet one. lol...I will say I did not notice a bit of difference when I installed the turbo adapters on mine. Of course that goes back to the truck being torque and limit based, and that's how I tune also instead of just going in and maxing and defeating all limiters I have seen others do.