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Author Topic: Is using engine braking to heat up engine quickly worth it? Back to Topics
Sal30

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Message Posted: Apr 19, 2013 3:36:33 AM

Does anyone with a manual, automatic with Tiptronic or Paddlevshiftets or dual clutch with manual shift option use engine braking at stop signs and traffic lights to speed up getting the engine to proper operating temperature quickly. How much does this increase fuel economy.
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tdioiler
All-Star Author Detroit

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Message Posted: May 2, 2013 11:47:39 PM

most engine controllers will still spray fuel even when the engine is being used to break with. So not really sure it's any real benefit. But I would love to run some tests on that theory.
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Dennis783
Champion Author Des Moines

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Message Posted: May 2, 2013 7:50:13 AM

I don't think there is a need to warm up
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OilerFan
Champion Author Tulsa

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Message Posted: Apr 25, 2013 7:30:40 AM

I drive a manual transmission. I can't see a benefit in downshifting to brake, as far as warming up the oil in the block quicker. I think just sitting still and warming the block is the thing to do.
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eyegotgas2
Champion Author British Columbia

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Message Posted: Apr 25, 2013 7:20:16 AM

It seems pointless to me but certainly can't help but reduce fuel economy. The more you brake the more fuel you use due to acceleration once you have stopped.

The best mileage is from steady speeds with minimal breaking
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streetirsx
All-Star Author North Dakota

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Message Posted: Apr 25, 2013 3:16:07 AM

it wound not work and wound not heat up quicker because newer vehicles when u decelerate in gear it shuts off the injectors and provide no fuel to the engine while it decelerates/coast to a stop. It's mor efficient to drive it about 5 mins with a load to being it to operating temperature.
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WES03
Champion Author Maryland

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Message Posted: Apr 24, 2013 9:06:16 AM

No clue.
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MertieMan
Champion Author Lexington

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Message Posted: Apr 23, 2013 5:31:42 AM

I smell over confidence here. The engine will heat up sufficiently by merely driving it about two blocks. Why do you need it to heat up any quicker? Heat is hard on an engine anyway.
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speedy700
Champion Author New Jersey

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Message Posted: Apr 22, 2013 10:27:12 AM

Not worth it...
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rumbleseat
Champion Author Winnipeg

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Message Posted: Apr 22, 2013 3:43:57 AM

If your engine is that cold, moderate driving is called for until the engine and transmission reache operating temperature.
Seems to me forcing the engine to run faster to slow the car down would be hard on the cold engine and transmission, as would driving fast enough to warrant trying to use the cold engine to slow the car.
I can't see how it would make a noticeable difference on warming the engine anyway, and I live in prairie winter country.
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WEPSMAN
Champion Author South Dakota

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Message Posted: Apr 21, 2013 9:51:38 PM

Probably will not help.
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rick_evans
Champion Author Boston

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Message Posted: Apr 21, 2013 6:33:50 PM

I drive a manual and just drive normally to warm the engine which happens in about 5 minutes.
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MetroManiac
Champion Author Rochester

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Message Posted: Apr 21, 2013 6:17:47 PM

this would immediately reduce your fuel economy, counter productive.
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GLM4205
Champion Author Toledo

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Message Posted: Apr 21, 2013 3:34:33 PM

No
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giwan
Champion Author Michigan

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Message Posted: Apr 21, 2013 1:36:33 PM

Seems very doubtful to be that useful
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gougedQC
Champion Author Montreal

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Message Posted: Apr 21, 2013 11:12:12 AM

simply driving moderately, even on extremely cold days, will warm up the engine fairly quickly..

The idea of downshifting to speed warm up, is very doubtful in theory, and even if possible, would only be necessary in the first few minutes of driving.

Very doubtful, because heat is generated by combustion, downshifting and using compression braking, means little to no fuel (depending on technology of car) and therefore very little to no heat generated anyway.

In the meantime, DONUKNOW, is correct, all you're doing is increasing wear on engine and driveline.
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dontuknowOH
Champion Author Ohio

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Message Posted: Apr 20, 2013 12:25:52 PM

No facts, but down-shifting the trannies and creating higher engine compression braking rpms, with the EFI fuel cut-off going to 0 throttle (idle) position would save on brake wear, also use no fuel energy for short intervals driving the alternator charge loads/power accessories.

The extra wear on using the tranny in reverse torque fashion back to the engine (pushing engine motion rpms) still is causing for parts wear by drive-train rolling friction, otherwise partially engaged at lower rpms.

Quicker Heat warm-up would be a small factor on cold temp days, Summer weather warming to normal maybe yes Savings.. small if any, myop....

Low Compression heat build-up doesn't compare to fuel energy heat in use, but there is heat generated, at slower rates.
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OceanArcher
Champion Author Mississippi

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Message Posted: Apr 19, 2013 4:39:34 PM

Never found it to be of significant impact ....
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chesapeake07
All-Star Author Oklahoma City

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Message Posted: Apr 19, 2013 1:58:45 PM

Very useful information.
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Houckster
Champion Author Atlanta

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Message Posted: Apr 19, 2013 1:37:18 PM

I don't think downshifting to warm the engine will work. On most cars, when the car is coasting, fuel flow is reduced to a point where the engine will keep running but that's about it.

If you want to reduce the time it takes to warm the engine, get a block heater.
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jes
Champion Author Pennsylvania

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Message Posted: Apr 19, 2013 5:03:31 AM

no
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