The inertia effect greatly enhances cylinder filling efficiency and the torque produced by
the engine at higher rpm.
However, don't expect much from
this engine at higher rpm.
Here, it gladly holds
the engine at higher rpm and kicks down more readily when you jab the accelerator.
These CVTs are smooth in operation, but there is still a tendency for them to feel a bit elastic in acceleration or hold
the engine at a high rpm in steady state cruising, a condition called» motorboating».
For instance, in drag racing, the automatic transmission allows the car to stop with
the engine at a high rpm (the «stall speed») to allow for a very quick launch when the brakes are released.
Although this mode works well at moderate throttle inputs, anything more and the CVT gearbox merely holds
the engine at high rpm.
Not exact matches
The primary power source for the Patriot is a twin spool gas turbine like those found in jet
engines, which runs
at 100 000 revolutions per minute in its
high - speed stage, and 50 000
rpm in its low - speed stage.
The transmission emulates a traditional automatic, «shifting» so the
engine doesn't linger
at high rpm with the rubber - band acceleration sensation we detested in older Subaru CVTs.
Slip the pistol - grip shifter into fifth or even fourth gear
at 70 mph and the reward is
high -
rpm fun as the 6.4 - liter
engine blares from the large dual exhausts.
It also makes more torque than the old four - cylinder
at any given
rpm, is quieter and smoother, and pulls more strongly
at high engine speeds.
Reggiani went into detail about the
engine choice, too: «When we made a product profile, we recognised that talking about an SUV — a car that must be able to go offroad, or go in a situation where you have asphalt that's not flat — it was more and more fundamental to have
high level of torque
at low
rpm.
The question is do you prefer to have the HP when the
engine is
at screaming
high RPM or do you prefer to have it when the
engine is running
at more moderate
RPMs.
It will be offered with 16 - or 17 - inch wheels, and replaces the current Optima Hybrid's 2.4 - liter gas direct - injection
engine with a 2.0 - liter gas - direct injection four with a
high - voltage electric oil pump, rated 154 horsepower
at 6,000
rpm and 139 pound - feet
at 4,000
rpm.
The
RPMs are
higher in the cold because
engines are pretty inefficient
at cold temperatures.
Also the problem is worse with a warm
engine / transmission than when it is cold, presumably because
at higher temperatures it idles
at lower
rpm.
It can reduce the
engine noise by up to 3 dB below 2000
rpm, but then is used to slightly alter the
engine's note
at high revs.
It's a quiet
engine most of the time, only revealing a slightly agricultural note
at higher rpm.
Calibrated for
high mileage, the Drive mode allows the
engine to run
at very low
rpm while cruising, which sometimes produces a slight vibration.
Electric motors are most potent from zero
rpm, so most of the acceleration, delivered via a single - speed auto transmission, is in the first 30mph, though BMW does claim that the
engine changes enhance acceleration
at higher road speeds, too.
For example,
at the red light when idling and without touching the gas pedal, the
engine in some cases starts «hunting», oscillating between the usual minimum
rpm and an
higher value like I was giving rpetitive pushes to the pedal, or, more frequently, the
engine start keeping a quite
high rpm (I estimate 2000 - 3000
rpm), VERY constant, before dropping back to normal.
At 80 mph, the
engine isn't spinning too
high — around 2,400
rpm — and 20/26 mpg city / hwy fuel economy isn't terrible, but the very best you can expect from the 13.7 - gallon tank is around 350 miles, which led me to join contributor Marc Noordeloos in wishing for more range.
Now making 440 hp and 406 lb - ft of torque (increases of 20 hp and 22 lb - ft, respectively), the
engine is refreshingly responsive and smooth, even under heavy loads and
at high rpm.
The coolest thing the TSX got is it i - VTEC
engine kicks
at high RPM and Its High Intensity Discharge Lig
high RPM and Its
High Intensity Discharge Lig
High Intensity Discharge Lights.
If I have the smart phone audio hooked up to the car stereo and the inverter charging the phone I get a
high pitched tone through the speakers
at around 4k
RPM that increases in pitch with the
RPM of the
engine.
The 3 - litre V6 is a mighty
engine, delivering solid urge throughout the rev range and with a pleasingly hard - edged exhaust note cutting in
at higher rpm.
Boosted
engines also perform worse
at high rpm and
high load, as the
engine is forced to run rich to keep temperatures down and prevent damage to the internal components.
With its low - friction valvetrain, variable valve - timing and the latest Bosch
engine management system, the V - 12 feels awake
at last, and it spins effortlessly to its power peak, which comes nearly 1000
rpm higher than a decade ago.
This process creates an enormous amount of heat and has the effect of making the
engine rev
at higher rpm's (not necessarily a bad thing).
Peak torque arrives
at 4,700
rpm, though it's
higher than 200 lb - ft across essentially the entire
engine speed range.
Engines for this sort of application typically sacrifice peak torque and torque spread for gains
at high rpm.
Aside from the
high - revving
engine (about 3700
rpm at 75 mph), the Fit was a perfectly pleasant car to drive two - and - a-half hours to GingerMan Raceway early on a Wednesday morning.
Other than the rough idle and hard starting there's no problem, the
engine has plenty of power
at high rpms and doesn't seem to be misfiring, both of which I think it would have problems with if the fuel pump wasn't providing sufficient pressure or volume.
This question is for the same
engine and the same car as in the following question: Likely cause of poor performance
at low
RPM but normal
at higher RPM?
And the
engine's
high torque
at low
rpm (thank you, turbos), means a bunch of horsepower down low in the rev range (for you fellow drag racing and dyno - chart freaks you know what I mean).
Peak output is up significantly over the 612's, and it occurs
at a much
higher point in the
engine's rev range: 651 hp
at 8000
rpm versus 532 hp
at 7250
rpm.
Under
higher loads and
at the
higher band of
rpm, spark ignition seamlessly takes over from SPCCI, resulting in the feeling of a turbocharged
engine that is falling out of its power band
at the top end.
Although the melody no longer depends on
high revs to flourish fully,
at around 3,500
rpm the
engine's voice breaks suddenly into «baw - wah, wah - baw,» which grows tireseome if 3,000 - 4,000
rpm happens to be your favorite spot in the rev range.
A 1.0 - liter turbocharged EcoBoost three - cylinder will be the base
engine in China, with a new 1.5 - liter turbo EcoBoost I - 4 tuned for
high torque
at low
rpms serving as the optional powerplant.
The way diesels deliver power is a lot like old - school American V - 8
engines — loads of torque down low, and not much power
at high rpms.
Yes, calls for strong acceleration, such as highway merging, will keep the
engine hung up
at high rpms, but more casual acceleration is accomplished with little
high -
rpm droning.
At WOT at higher RPM (I'm guessing near 80 % of redline), the engine will go into what I can only assume is fuel cut mode and the car will coas
At WOT
at higher RPM (I'm guessing near 80 % of redline), the engine will go into what I can only assume is fuel cut mode and the car will coas
at higher RPM (I'm guessing near 80 % of redline), the
engine will go into what I can only assume is fuel cut mode and the car will coast.
This EcoBoost
engine feels plenty responsive, with little turbo lag and plenty of passing power
at higher rpm.
In this regard, the new 5.2 - liter V - 8 in the GT350 and GT350R redlines
at just above 8,000
rpm, a
high number for an
engine of this size.
With the
engine running the voltage should be
higher — maybe not much
higher at idle, but if you bring the
engine up to a normal cruise
RPM, say 2,000 or so, you should see something between 13.5 V to 14.5 V (a bit more or less isn't necessarily a problem).
Then add acetone
at a rate of six ounces for every ten gallons and run the
engine immediately in low gear
at high RPM (3,500
RPM) for 15 minutes and floor it on the highway six times.
With an automatic transmission this is very difficult because if you try to run the
engine at wide open throttle the automatic transmission will extend your shift point up to the
high RPM range and you will get very bad BSFC and in turn efficiency.
Aside from the slight power increase, chief engineer Dr. Hermann - Joseph Storp says that they worked on the V - 8's sound quality
at higher rpm; indeed, when it crosses 3000
rpm the
engine emits a muted burble, while
at lower
engine speeds it's barely audible.
When you are down shifting you are using the
engine as a brake, however if you are down - shifting
at very
high RPM and your
engine is revving, over time the synchronizer can be damaged, or it is already damaged.
On top of that, your car
engine has to waste even more energy
at high RPMs turning the alternator, the water pump, steering pump, etc..
Ram Trucks worked with
engine supplier Cummins to program «more aggressive» turbocharger boost and fuel injection patterns, pumping up the
High Output diesel's torque output by 15 lb - ft, to a total of 865 lb - ft
at 1700
rpm.