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A secret feature--anti-stall ?

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My Rapid seems to have a feature not mentioned in the brochure.

 

When I draw up at the end of a queue of stationary traffic , put it in neutral, put the hand brake on the revs drop after about 5 to 10 seconds from 1000 to 750.

 

If I let the hand brake off -touch nothing else--and roll forwards on the slope of the road even just 3 or 4 inches the revs go up to 1000 until the car is quite still again when they drop to 750.

 

This happens every time without fail.

 

I think it is an anti-stall feature.  It lifts the revs to make it a little less likely to stall on lift off.

 

What else can it be?  Is it in the brochure ??  Anyone else got it ?  I have learned very quickly to like it !!!.

Does ur rapid have the hill hold control? What engine and what trim is it?

Most cars will do this. My Octavia is quite happy to shuffle along, even uphill, without me using the accelerator, I can just lift the clutch and it will rev it a bit to move.

I bet you bought a diesel.

...with a low ratio first gear :)

 

Though to some extent this will apply to any car with an electronic throttle. The last car I drove that didn't do it was an Impreza, but that had a regular mechanical cable throttle, so if you strained it and the revs dropped, it just cut out.

leave a diesel in first gear, clutch depressed, raise it a few mm and you get some momentum. It's called torque. Try the same thing in a petrol and you'll stall unless you give it some fuel.

Yeah, this is normal.

 

I notice it when I stick my Rapid in reverse, even without using any throttle the engine gives itself a little blip of power to keep turning.

  • Author

Interesting replies. Thank you.

 

I still find it astonishing that my car can sense it has moved 3 or 4 inches and raises its revs automatically.  Nothing gets touched except the hand brake --no accelerator no clutch pedal --nothing.  It is the moving forwards that does it.  I've tested it over and over.  I thought it was the hand brake going off that did it but the revs don't rise unless the car moves a few inches.

 

Pure Magic

 

I've just worked out the Rapid is 5 hundredweight lighter than my Octavia was.  No wonder it goes like dung off a spade. :happy: .

The ECU has a target RPM at idle, as soon as any extra load goes onto the engine the rpm drops so the ECU throttles the engine to keep it going, then it gets a reading from the speed sensor (on some modern cars this signal comes from the ABS so is almost instant) so it know's what's going on.

 

The aircon doesn't raise the revs so much because the ECU knows how much load that will add, and gets a signal when you turn it on.

When in neutral, press the brake pedal and keep it pressed. Then raise your foot to release the pedal. You will see an instant slight raise of the rpm. This was happening in my both previous Skodas ('02 Octavia 1.6 mpi and '06 Fabia 1.2Htp 12v) as in my current Roomster. All three of them were (and is) petrol cars.

My Roomster does this too.  Depress the clutch and brake to a halt and the engine revs at 1000rpm.  As soon as the car stops it drops back to 750rpm.

 

I think it is for braking - while the car is moving it needs a certain amount of brake assistance to enable ABS etc so it holds the revs a little higher until you come to a complete halt.

I noticed the same thing for 1.6 tdi and I like it. The cars are becoming smarter than most o ppl :giggle:

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