6-speed manual owners; is your engine braking delayed?

[dgc333]

You can go all the way back to the early 70's and find dash pots on the throttles of carburated engines to slow down closing for emissions purposes.

My Ecoboost delays the throttle closing for a split second but in no way delays engine braking on a down shift.

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[Tofino]

It delays the revs dropping for a second as your shifting yes.
But it doesn't delay engine braking.
By the time I downshift and let the clutch back out the revs are down, and you can feel engine braking the instant the clutch is engaged again.

 

[fionic]

yes. it's part of the tune.

 

[fionic]

It delays the revs dropping for a second as your shifting yes.
But it doesn't delay engine braking.
By the time I downshift and let the cltch back out the revs are down, and you can feel engine braking the instant the clutch is engaged again.

yes.

BUT, if you, let's say, go from 2k-6k in 2nd full throttle then let off throttle completely, the engine stays at 6k for a few seconds. It's to save fuel.

 

[KilluminatiDre]

Yes I experience this too, some call it rev hang. I'm hoping my Lund tune will be able to do away with it.

 

[Anthony 05 GT]

It is rev hang and it's there for 2 reasons. 1st for emissions and 2nd to avoid dropping below the set idle speed and causing a stall when you let off. It can be controlled in the tune, but if you reduce the hang time you could have stall issues especially if your maf or throttle body begin to get dirty.

 

[KilluminatiDre]

Good to know a tune can get rid if it. I want it gone so bad.

 

[Cueball]

I never use engine braking. Brake pads are cheaper in the long run.

 

[magnus_1986]

So at first I was like, what's this guy talking about and then I went out and did some trial runs in 1st and 2nd gear.

Yep it's delayed. By about a second or so. I'm pretty sure all of the cars I've owned till now (all manuals) have had this and the Subaru had the rev hang.

 

[fionic]

I never use engine braking. Brake pads are cheaper in the long run.

it's not about being cheaper. Engine braking is approximately 1000% more fun to do.

 

[BmacIL]

Yeah guys, this is different than rev hang, which is between shifts with the clutch in. This delay occurs immediately after you rev-match downshift. You'll feel a delay in engine braking reverse torque for about 1 second. The revs will still be up, but the engine is still being fueled briefly as compensation against change-of-mind (i.e. I downshift to immediately get on the gas to pass someone, you will get better response by keeping the combustion going lightly).

 

[ARS1]

Notta... I generally always rev match but even without it seems ok. Actually seems to slow down too quick sometimes and I have to ride that gear for a few seconds longer.

 

[ABQautoxer]

I never use engine braking. Brake pads are cheaper in the long run.

And slower given the right circumstances. Brakes only slow you down...

 

[Grimace427]

Somewhere I read an account of a conversation with a Ford engineer who said that this behavior was needed to meet an emissions requirement, to avoid letting unburnt fuel into the exhaust system.

yes. it's part of the tune.

Yep. Forget downshifting, just accelerate in a gear then let off the throttle without doing anything else. You will feel the delay before engine braking takes effect. Either the throttle is being held open slightly or cam timing is adjusted to reduce compression momentarily. Aftermarket tune is a great fix.

 

[Tofino]

yes.

BUT, if you, let's say, go from 2k-6k in 2nd full throttle then let off throttle completely, the engine stays at 6k for a few seconds. It's to save fuel.

If yours is doing it for seconds, it lasts a lot longer than mine.
My gf tried to time it with a stop watch and its less than 1 second in my car.

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