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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 09-26-2018, 07:27 AM   #11
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Full throttle on the MK3 is 82% so doesnt surprise me if you at 3/4 throttle you dont feel a difference

My first question is how do you know the throttle is at 75% throttle ? If you has said 50% +/- I could understand your concern more

Tom
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Old 09-26-2018, 07:34 AM   #12
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Quote:
Originally Posted by 1turbofocus View Post
Full throttle on the MK3 is 82% so doesnt surprise me if you at 3/4 throttle you dont feel a difference

My first question is how do you know the throttle is at 75% throttle ? If you has said 50% +/- I could understand your concern more

Tom
I don't, I was just pressing down the pedal and there was no change, thats all.

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Old 12-05-2018, 02:23 PM   #13
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Totally Normal, especially if you've done any mods to the intake system. The stock throttle body flows more air than what the engine can pull in, in stock form at least.

So lets say that the maximum air intake of the engine is lets say 500cfm at 6500rpm. At wide open throttle the throttle body can flow a maximum of 750cfm. At 75% throttle, the throttle body can flow a maximum of 500cfm. So in this theoretical scenario, 75% throttle is the most throttle the engine will ever need to be at it's maximum airflow, so going from 75% throttle to 100% throttle isn't ever going to do anything to engine performance. This is the case with almost all fuel injected engines, because the throttle body almost always flows more air than the engine can handle.
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Old 12-05-2018, 09:09 PM   #14
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Think about the shape of the butterfly in the throttle body. Most of the change in opening is in the initial part of the turn where it cracks open and starts to let air in. at the end of rotation there's almost no difference to the increase in flow rate as the butterfly is already mostly parralel to the flow direction
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Old 12-05-2018, 09:29 PM   #15
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The engine is also much more sensitive to low flow air than high flow air and the condition of increasing both.

The plastic zetec throttle plate actually makes up for flowing too much, the rotation if the plate was flat exposes way too much too fast and the car takes off in a jerk and leap when new and engine is tight. Too sensitive and customers complain about it. The plate shape is made to slow down the increase in flow rate to about 3X the effective rotation distance before it reveals that much opening, the slowing down makes the driveability off-idle much smoother and more progressive.
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Old 12-06-2018, 09:55 PM   #16
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my dad was just telling me today some electronic throttle bodies only open 80 percent
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Old 02-22-2019, 07:41 AM   #17
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Emissions... enough said....

That's what I'm thinking... That's why allot of things are not 100% Open....

Could be wrong too...
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Old 02-26-2019, 10:38 AM   #18
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i noticed on my sct gauges i can get more throttle by actually applying way more pressure to the gas pedal once already floored than needed, the throttle percentage increases. im wondering if trimming stuff down in the pedal will allow more throttle?
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Old 02-26-2019, 12:06 PM   #19
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i noticed on my sct gauges i can get more throttle by actually applying way more pressure to the gas pedal once already floored than needed, the throttle percentage increases. im wondering if trimming stuff down in the pedal will allow more throttle?
It wont help to go past 82-85%

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Old 02-26-2019, 12:45 PM   #20
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Alright then, check your pm tom





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Originally Posted by 1turbofocus View Post
It wont help to go past 82-85%

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