09-17-2024, 02:42 AM
|
#31 (permalink)
|
It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,873
Thanks: 0
Thanked 1,684 Times in 1,502 Posts
|
Quote:
Originally Posted by Logic
So it has a normally open throttle valve just to charge vacuum powered ancillaries during overrun and braking/ (free power)
|
AFAIK the brake booster is the only vacuum-powered device on most (if not all) modern cars.
Quote:
I can see it getting hydraulic pressure to actuate, from the same pump that actuates the VVT, but, at a guess I'd say there's a torque sensor or 2 in the drive-train somewhere that picks up torque coming from the wheels and/or flywheel during overrun..?
Probably a braking sensor, involved in decisions to..?
|
I don't know how the electro-hydraulic actuators of the intake valves work, but the throttle plate is entirely electronically-controlled and actuated.
And most newer cars have electronic throttle pedals, regardless if gassers or Diesels.
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
10-14-2024, 02:01 PM
|
#32 (permalink)
|
Master EcoModder
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,789
Thanks: 320
Thanked 357 Times in 298 Posts
|
A few years ago BMW did a study that indicated 3/4 throttle acceleration was optimal. Also note that slow acceleration will affect traffic flow and the traffic signal operation algorithm.
|
|
|
10-15-2024, 02:14 PM
|
#33 (permalink)
|
aero guerrilla
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,747
Thanks: 1,327
Thanked 749 Times in 476 Posts
|
Quote:
Originally Posted by Grant-53
A few years ago BMW did a study that indicated 3/4 throttle acceleration was optimal. Also note that slow acceleration will affect traffic flow and the traffic signal operation algorithm.
|
Sounds close to the 80% load I heard about a while ago.
__________________
e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
|
|
|
10-17-2024, 02:39 AM
|
#34 (permalink)
|
It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,873
Thanks: 0
Thanked 1,684 Times in 1,502 Posts
|
Having learned to drive in a car without a tach, maybe relying on some random arbitrary pedal-based measure could be simpler, yet sometimes it doesn't work in real-life driving. I remember so many times hitting the pedal to the floor while the Opel Corsa B struggled to keep RPM before I had to shift to a lower gear...
|
|
|
10-27-2024, 08:41 PM
|
#35 (permalink)
|
EcoModding Lurker
Join Date: Nov 2011
Location: Princeton, NJ
Posts: 28
Thanks: 2
Thanked 6 Times in 6 Posts
|
#2) Go up the initial hill in 1st gear all the way or #3) Try to go up in 2nd as soon as as possible with my foot to the floor. (It's a moderate climate, so "cold" engine is just a relative term.)
IMHO, #2 would be best, but not with the engine screaming in 1st. #3, foot to the floor is never good. Warm up idle creates negative MPG and should not be used.
#3) option of leisurely acceleration with lower load through all the gears until reaching 4th or 5th would use the most fuel.
IMHO, #3 is the way to go, it will not use the most fuel.
|
|
|
10-27-2024, 08:49 PM
|
#36 (permalink)
|
EcoModding Lurker
Join Date: Nov 2011
Location: Princeton, NJ
Posts: 28
Thanks: 2
Thanked 6 Times in 6 Posts
|
#2) Go up the initial hill in 1st gear all the way or #3) Try to go up in 2nd as soon as as possible with my foot to the floor. (It's a moderate climate, so "cold" engine is just a relative term.)
IMHO, #2 would be best, but not with the engine screaming in 1st. #3, foot to the floor is never good. Warm up idle creates negative MPG and should not be used.
#3) option of leisurely acceleration with lower load through all the gears until reaching 4th or 5th would use the most fuel.
IMHO, #3 is the way to go, it will not use the most fuel.
|
|
|
10-30-2024, 02:07 AM
|
#37 (permalink)
|
It's all about Diesel
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,873
Thanks: 0
Thanked 1,684 Times in 1,502 Posts
|
Sure the slope of the hill would dictate the correct gear to start driving. And maybe with some clutch kicks as a last-resort attempt to prevent the engine from stalling while trying to climb with a taller gear, not only fuel consumption would increase but also wear and tear.
|
|
|
|