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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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Old 04-01-2013, 08:00 PM   #1
RedVAhb757
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Talking Head Work.

Am I the only one thinking about pulling the head off and having the intake & exhaust ports enlarged & drilling the valve outlets for larger intake & exhaust valves?

Would a custom cam be needed?

Would this require a larger throttle body?

Would there be any effects on the PCM?

Would I need larger injectors?

Would the timing have to be changed?

Would the stock fuel pump be sufficient?

What kind of numbers would this work, along with a CAI, header and exhaust be ballpark around?

I see all these exhaust threads & whatnot but I want some serious power gains without having a turbo installed & keeping it naturally aspirated. I'm gonna call cosworth, some local machine shops and engine builders to get some ideas. I'm tired of waiting for stuff to come out when it seems like not many companies give a rats about us! I feel like they're not making mods so it won't hurt the ST sales IMO.

So please everybody fire away on my questions. I think 235hp isn't acheivable. I'm tired of waiting, I'm ready to lead a new mod & be the guinea pig!!!!


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Old 04-01-2013, 08:15 PM   #2
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Most modern 4cyl 2L engines don't like oversized valves.

A cheaper/easier route would be to port, polish, and coat the intake manifold and exhaust manifold.

Aftermarket cams will give you the best benefit power-wise if you do pull the engine. However, it'll be difficult sourcing parts for non-ST foci this early in the game. Sleeving to 2.2L will get you closer to the power range you're looking for.

Regardless, you won't see much power gains, maybe ~40whp through and through. You'd be amazed at how much faster a car with proper suspension and tires will get you.

Basically; you bought the wrong car. The money you're dumping in mods could have covered the difference for a ST.
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Old 04-01-2013, 09:25 PM   #3
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Who knows if the focus can support that much airflow modification without a tune anyway.
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Old 04-01-2013, 11:28 PM   #4
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Quote:
Originally Posted by StingRay View Post
Who knows if the focus can support that much airflow modification without a tune anyway.
it won't.

i don't even know if there's availability to upgrade the fuel delivery even.

not to mention who knows if a piggy back ecu system would even work with the BCM.
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Old 04-02-2013, 12:55 AM   #5
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If the injectors and hpfp in the n/a cars are the same as the ST fuel delivery shouldn't be a problem. But yeah, maybe still an issue.
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Old 04-02-2013, 02:16 AM   #6
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Quote:
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Basically; you bought the wrong car. The money you're dumping in mods could have covered the difference for a ST.
I love your can-do attitude. It's downright inspiring.
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Old 04-02-2013, 01:25 PM   #7
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Quote:
Originally Posted by StingRay View Post
If the injectors and hpfp in the n/a cars are the same as the ST fuel delivery shouldn't be a problem. But yeah, maybe still an issue.
ST has different fuel pumps and sender assembly as well as different injectors.

The ST system is maxing out at about 300whp.

Quote:
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I love your can-do attitude. It's downright inspiring.
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Old 04-02-2013, 01:29 PM   #8
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No, you first.
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Old 04-02-2013, 01:52 PM   #9
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Quote:
Originally Posted by thejordan View Post
Most modern 4cyl 2L engines don't like oversized valves.

A cheaper/easier route would be to port, polish, and coat the intake manifold and exhaust manifold.

Aftermarket cams will give you the best benefit power-wise if you do pull the engine. However, it'll be difficult sourcing parts for non-ST foci this early in the game. Sleeving to 2.2L will get you closer to the power range you're looking for.

Regardless, you won't see much power gains, maybe ~40whp through and through. You'd be amazed at how much faster a car with proper suspension and tires will get you.

Basically; you bought the wrong car. The money you're dumping in mods could have covered the difference for a ST.
I bought it used & a lot cheaper than a new MK3 would have been I saved about 5k. How bout porting the exhaust & intake ports on the head? Just figured if you put a CAI, header & exhaust on this would help easily break the 200hp barrier.
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Old 04-02-2013, 01:58 PM   #10
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Quote:
Originally Posted by RedVAhb757 View Post
I bought it used & a lot cheaper than a new MK3 would have been I saved about 5k. How bout porting the exhaust & intake ports on the head? Just figured if you put a CAI, header & exhaust on this would help easily break the 200hp barrier.
At 200 HP you're going to be pushing the limits of the DCT.
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