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DURATEC Ti-VCT Performance (2012-Current) The place to chat about any Duratec 2.0L Ti-VCT engine performance, tuning and exhaust related upgrades.

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Topic Review (Newest First)
Today 12:40 AM
FFhb13
Quote:
Originally Posted by dyn085 View Post
By all means, do all the testing you want. I was here when the platform was released and watched or participated in nearly all of the growth. I have nothing to prove to you or anyone else and don't even own a Mk3 anymore.

I can relay my experience and what I've seen, but if that somehow translates to me not modifying enough cars...Idk what to tell you. My Mk3 was one of the most modified and recognized in the community when I had it, and I've since bought and taken both of my ST's to stage 3 and then began doing my own tuning. And no offense, but that's just the last three years.

I'm not perfect, but I don't have a very strong record of being wrong.
I was never implying you dont know a lot about this platform of cars.

However you were quoting theory and saying there was no way there could be losses on a na engine....you've done a lot of work on forced induction.cars and i agree...bigger exhaust is better.... i still have lots to learn always.and dont pretend i know everything, in fact i forget lots and remember things i forgot i knew...even having been modding and messing with cars since around 1996, theres so much changing and evolving.

If i find that that large of an exhaust does in fact not result in a large low end loss (despite what ive encountered in my own experiences) then ill be the first to say im wrong..but i guess im old.school and i need proof and/or experience it myself rather then taking someones comments as gospel.
Today 12:23 AM
FFhb13
Quote:
Originally Posted by felixthecat View Post
I run a fwerks header w/ a 2.5 system & it sounds very similar to stock, yea it has a tad bit of header ting. I'm going to be at OSFW4 to see & hear my foci.
Ive had 4-1 and 4-2-1 headers on about 6 different cars and adding the header didnt make the exhaust appreciably louder, in fact it made the.exhaust note.deeper
Yesterday 10:38 PM
Jburks is it a DCT or 5spd? any thoughts on putting it on a dyno? especially after a tune. you'd be the only one with a 3in exhaust and header.
Yesterday 10:03 PM
tower2 At first there was drop in mpg and low end power with stock tune. I added a venturi device right where the header and exhaust bolt up and now have great mpg and power all across. Waiting to get tuned and see how she goes
Yesterday 10:02 PM
tower2
Yesterday 10:01 PM
tower2
Yesterday 11:14 AM
Jburks
Quote:
Originally Posted by felixthecat View Post
I run a fwerks header w/ a 2.5 system & it sounds very similar to stock, yea it has a tad bit of header ting. I'm going to be at OSFW4 to see & hear my foci.
wish I could be there to hear it!
Yesterday 10:52 AM
felixthecat
Quote:
Originally Posted by Jburks View Post
true but I am also considering noise. this is my daily, not a track car. I want it to be comfortable for everyday driving. I'm aware I could gain more horsepower by adding a header but is the few extra hp worth the extra noise? I don't know. there are not very many mk3's on this forum with a header so it's hard to tell. The whole point in me modifying my focus was to make it a better daily driver. for me that meant adding a few more whp and improving the suspension so doing a intake, tune and eventually a catback might be all I need to meet those goals.
I run a fwerks header w/ a 2.5 system & it sounds very similar to stock, yea it has a tad bit of header ting. I'm going to be at OSFW4 to see & hear my foci.
Yesterday 08:33 AM
Jburks
Quote:
Originally Posted by FFhb13 View Post
Don't keep stock manifold, simple..it's restrictive, anyone that does an exhaust and cares about performance will upgrade the manifold because the system is only as good as the sum of it's parts..an intake and exhaust without a header is still leaving a restriction in, nullifying some of the gains of the intake and exhaust...just like people that upgrade headers and exhaust but leave their stock cat in, at 1.75" or whatever pipe to save money... making it 2.25" all the way makes a big difference
true but I am also considering noise. this is my daily, not a track car. I want it to be comfortable for everyday driving. I'm aware I could gain more horsepower by adding a header but is the few extra hp worth the extra noise? I don't know. there are not very many mk3's on this forum with a header so it's hard to tell. The whole point in me modifying my focus was to make it a better daily driver. for me that meant adding a few more whp and improving the suspension so doing a intake, tune and eventually a catback might be all I need to meet those goals.
Yesterday 06:01 AM
AmericanCaveman
Quote:
Originally Posted by dyn085 View Post
Lol, you don't have to apologize for having an opinion. Maybe it will make more sense if I clarify my statement-

Primaries and secondaries (aka header[s]) absolutely can be too large and absolutely will change the powerband. That's basically the point of having them. A vehicle with no tuning or cam changes will see an improvement in one area of the tach with a reduction in another.

Beyond that, the sole intent is the evacuation of those spent gases. Stop the exhaust right there and you'll have the maximum power available. This is why most race cars have a dump or a short run to a side-exit. If it's a dump then is most likely a drag car because having those gases beneath the passenger compartment is no bueno.

Most of us can't/won't hack up our car to get those gases out in a faster fashion. The only alternative is to open the tubing diameter going out the rear of the car. Because the velocity increase that's necessary occurs within the primaries/secondaries, you're only limited by what physically fits or that you can afford.

If velocity in the CBE was so important, you would see people ceramic-coating them or wrapping them with header wrap. It's also worth noting that Gabe's 183 whp had come from a 3" exhaust after getting 175 whp on 2.5". But in equal fashion, I will also gladly change my stance if someone ever proves otherwise on the Duratec. If 2.5" was enough (or, at worst, too much) then there would have been no gains with the increase.

I would be inclined to believe there was a change in the header for this to occur.
I just don't want to seem like a know it all or anything, lol. I'm just here enjoying the forum and the conversations, like we're having now!

You are very correct about exhaust size affecting where the power goes to on the tach. Even with exhaust that was way too big for my 300 it at least made my I6 breathe better on the top end.

The only place I disagree with you on is the importance of a simple CBE (cat back exhaust, correct?). The reason being this is all I've done to my 300 (it already had the split EFI manifolds) and I seen a lot of good gains in performance and bad depending on what I did. Don't get me wrong, I know you're not saying a CBE is not important at all. I just think you may not realize how much power loss you can get when a CBE is done incorrectly.

Down the road I plan on doing a full CBE on my Focus and I probably will do the 2.50'' though. This is for two reasons. Everyone and their dog says it made a big difference in power, so I'm assuming there's something to it. Also for a more vain reason, I want the exhaust to sound deep. It's not like my 2.0 is rolling in gobs of low end torque as it is. I pretty much have to get out of the car and push it to get it going now, HAHA!

If I gain low end grunt from a 2.50'', I'll happily admit my theory was wrong about our two liters! And I readily will tell anyone all I have is theory with the 2.0 exhaust and not experience at the moment.


BTW, anyone who will tell you a 300 can't sound like a V-8 is full of beans!
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