Ecoboost mod list

[Suddueth13]

From what I've seen from detailed engine bay pictures, the downpipe seems well designed, and is of decent enough size. The catalyst isn't directly after the turbine housing like in most FWD applications either.

Regardless, very excited to see what can be had out of it

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[Ryudo83]

From what I've seen from detailed engine bay pictures, the downpipe seems well designed, and is of decent enough size. The catalyst isn't directly after the turbine housing like in most FWD applications either.

Regardless, very excited to see what can be had out of it

While it does look that way it really all depends on the layout of the substrate inside. The cat on the DP for a WRX is a decent distance from the turbine housing but it picks up huge gains from a catless DP.

The DP on the S550 definitely looks rather large and possibly pretty free flowing but there should still be decent gains to be had from replacing it

 

[Suddueth13]

There will certainly be gains for sure. All I'm saying is don't expect the kind of gains that people have seen from the ST cars or other FWD based turbo cars. Catalytic converters don't rob as much power as people think they do. On the WRXs, what is the power difference between the same downpipe with a high flow cat vs catless? Or even the stock downpipe vs the stock downpipe with a racepipe welded in place of the converter? Genuinely curious as I'm not familiar with the power gains on them.

 

[stilesg57]

There will certainly be gains for sure. All I'm saying is don't expect the kind of gains that people have seen from the ST cars or other FWD based turbo cars. Catalytic converters don't rob as much power as people think they do. On the WRXs, what is the power difference between the same downpipe with a high flow cat vs catless? Or even the stock downpipe vs the stock downpipe with a racepipe welded in place of the converter? Genuinely curious as I'm not familiar with the power gains on them.

Years ago I recall Cobb offered a hi-flo catted dp with the great bellmouth design (where the pipe meets the hotside of the turbo was the terrible design in the original WRXs). After accounting for a tune, the catted version cost you about 15whp compared to a catless TurboXS as I recall (+25whp vs +40whp if memory serves). It's been over 10 years and my memory may be a bit rusty on that, but it was a good difference. So percentage-wise, it's a big hit, no matter how high-flowing the cat is.

Would love for the 2.3L EB to respond to a couple simple mods as well as the old 2L EJ WRX motors did...

 

[foghat]

There will certainly be gains for sure. All I'm saying is don't expect the kind of gains that people have seen from the ST cars or other FWD based turbo cars. Catalytic converters don't rob as much power as people think they do. On the WRXs, what is the power difference between the same downpipe with a high flow cat vs catless? Or even the stock downpipe vs the stock downpipe with a racepipe welded in place of the converter? Genuinely curious as I'm not familiar with the power gains on them.

Don't know about a wrx, but on a n54 (bmw), catless downpipes with the proper supporting tune will net you about 20-25 whp. Significant.

 

[Swoope]

it really depends on the cat, and the only photos of cats we have really seen have been from the gt..

if they are using the same cat it might be a good thing.. looks to have some flow to it..

beers

 

[Suddueth13]

It's one thing when you alter the tune for catless vs. catted though. It's a whole other on no change in tune, simply cat vs. no cat. 15hp when you're at levels exceeding 275whp feels less and less significant. Most of the time, it's barely noticeable. On a car making 100whp, 15hp is significant. Either way, very excited to see what happens

 

[stilesg57]

It's one thing when you alter the tune for catless vs. catted though. It's a whole other on no change in tune, simply cat vs. no cat.

....yeah, you're technically right, but shouldn't you always redo the tune when you make major parts changes/upgrades on turbo cars? That's certainly been my view/philosophy. Heck, IIRC the older WRX flat out wouldn't run right without a tune just with the addition of a non-factory intake. Tuning just has to be spot on when you're squeezing so many hp per liter of displacement or you're asking for trouble.

 

[Suddueth13]

Yeah, you'd ideally want to alter the tune for any change you make to make the most benefit from it. My point is that from a standalone flow perspective, it's not that big of a difference.

 

[Herr_Poopschitz]

Not sure about which direction to go...stock engine w/ bolt ons, or take the head off first thing, examine it, then start grinding on it...

 

[Genny2stang]

Isn't the best thing for a turbo engine, to remove cats ( meaning straight pipe back) and get a tune. Of course intake and IC but a tune and free flowing exhaust gets most gains...

 

[Fredness]

Potentially ordering a 2015 Ecoboost Premium PP in June-ish time frame.

In order:
-PCV Catch can
-3" catted downpipe
-3" exhaust with 45* mandrel bends (vs. factory 90*), Y-pipe in place of the resonator with a 1/4 wave chamber on the passenger side to kill the drone of the 3" exhaust, going down the drivers side, blanking plate on passenger side (or a "dummy plate" in the rear valence).
-E85 (My tuning)
-Modded stock intake to keep appearance - paper filter
-External transcooler (LARGE)
-Sonnax 6R80 "Zip Kit" (if needed)

Prediction: Someone here is going to be at 400rwhp by this time 2015...

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