[gadgee]

Does anyone know at what RPM the turbo comes in in the ecoboost engine?

 

[Hywel S Wales]

According to this https://www.ford.co.uk/shop/researc...ncy/ford-ecoboost/1-litre-ecoboost-wins-award

The engine’s compact, low-inertia turbocharger spins at up to 248,000 rpm – more than 4,000 times per second.

Doesn't mean anything to me though !!

 

[Gremlin]

about 1400 (engine) rpm

 

[gadgee]

1400 - that's low which means the turbo is active most of the time?

 

[Gremlin]

yep, that's how a small displacement engine can do so well. (along with direct fuel injection...and more hacks to make it warm up quickly)

 

[cianpars]

I've read many pieces stating that the turbo kicks in at 1400, 1500, 1700 and even 2000. I can't seem to find a definitive answer anywhere

Hi Gremlin. How confident are you with your 1400 statement? Do you have a reliable source?

It's damned confusing with different figures being banded all over the net. Have Ford ever published or confirmed the numbers?

 

[Gremlin]

Do you have a reliable source?

although this is for the focus 1l, its the same engine
and the link comes from ford
https://media.ford.com/content/dam/...gine/Focus1.0-litre EcoBoost_TechSpecs_EU.pdf

if you look at the graphs on pg5, it shows torque and power both change at 1400

they also indicate the the 100 and 125 engines are essentially the same up to 4000 rpm

 

[cianpars]

Thanks Gremlin. That seems to be making sense. So my next question would be, what happens when you hit 4000 rpm?

Of course, the car is running between 1400 and 4000 rpm 99.9% of the time, so it's safe to assume that the turbo never stops.

Personally, I tend to stick to 70 mph on the motorway, not because that's the legal limit, but above that I see the mpg readout fall well below my average mpg reading. I think that's about 2500 rpm in 5th gear isn't it?

 

[Gremlin]

on the 100ps car, torque (acceleration) drops off at 4000, so selecting a higher gear is good. I did list the speeds in various gears previously