Surge of power when braking to a stop - Nissan Murano Forum
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#1 Old 06-16-2005, 08:05 PM
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Surge of power when braking to a stop

I've had my Mo for a couple of months now and I love it. One thing I have noticed however is sometimes when I am coming to a stop with my foot on the brake, I feel a very slight surge of power and I have to brake a little harder to get the Mo to stop smoothly. It is not a smooth even brake. The surge is sometimes a little scary. Has anyone else experienced this or have any explanation for whether this is normal or not?

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#2 Old 06-16-2005, 08:53 PM
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Yes Ella, it's the torque converter unlocking. I had the same feeling when new. I am used to it now. You'll anticipate it and learn to expect it as usual.

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#3 Old 06-16-2005, 09:12 PM
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I don't mind it at all, except when I am in traffic doing 20 mph. The convertor keeps locking and unlocking a thousand times which becomes annoying really fast....

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#4 Old 06-16-2005, 09:45 PM
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I guess I haven't driven the Mo long enough to actually notice a pattern. Does this mean it only happen when I am driving slow because I dont notice it all the time I just havent actually paid attention to a pattern of when it happens.

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#5 Old 06-16-2005, 09:57 PM
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It happens to me, but I find myself hitting both the gas and the brake. I wish they were a little farther apart.

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#6 Old 06-17-2005, 11:42 AM
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Quote:
Originally posted by ella138
I guess I haven't driven the Mo long enough to actually notice a pattern. Does this mean it only happen when I am driving slow because I dont notice it all the time I just havent actually paid attention to a pattern of when it happens.
The lock - unlock happens at 18 mph, or very close to that.

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zebelkan - if traffic requires driving for extended periods at low speeds (20 mph) put CVT in Ds to bring the revs up a little...will be a lot smoother and better for the entire powertrain as well...
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#8 Old 06-17-2005, 11:54 AM
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Quote:
Originally posted by senza
zebelkan - if traffic requires driving for extended periods at low speeds (20 mph) put CVT in Ds to bring the revs up a little...will be a lot smoother and better for the entire powertrain as well...
Good tip, and it makes sense. I will do that. Thanks....

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#9 Old 06-17-2005, 11:57 AM
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Yes I agree sometimes I've even tried L to avoid this.
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#10 Old 06-17-2005, 03:19 PM
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What does put the CTV into Ds mean???

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#11 Old 06-17-2005, 03:21 PM
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Re: Surge of power when braking to a stop

Quote:
Originally posted by ella138
I've had my Mo for a couple of months now and I love it. One thing I have noticed however is sometimes when I am coming to a stop with my foot on the brake, I feel a very slight surge of power and I have to brake a little harder to get the Mo to stop smoothly. It is not a smooth even brake. The surge is sometimes a little scary. Has anyone else experienced this or have any explanation for whether this is normal or not?
Just wanted to combine some of these answers and put them into pain English in case people haven't figured out the "locking and unlocking of the torque converter" thing.

As you're braking, the engine is still engaged, and the RPMs might jump up a bit to help you brake. It's essentially "engine braking" in a manual transmission, where you shift it into a lower gear to make the engine slow you down so you don't have to brake as hard. The MO does this automatically, and they call it "downhill assist" or something like that.

Anyway, as you're coming to a stop, the engine is helping you to brake (by keeping the torque converter "locked"). But once you get down to a particular speed (about 18mph) the engine decides that it's time to release it's grip and go to idle. This is the "unlocking" of the torque converter, and that's when you feel the surge of power.

So it's not really a surge of power, but the engine releasing its grip, therefore releasing some of the braking power.

It's caught me by surprise a couple of times as well, but it's normal behavior and once you know about it you do get used to it. Doesn't bother me anymore.

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#12 Old 06-17-2005, 03:22 PM
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Quote:
Originally posted by ella138
What does put the CTV into Ds mean???
You have an SE model which doesn't have the Ds mode for the CVT. Rather you have the sequential shift function. My 03 SE has D, Ds, and L.

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#13 Old 06-17-2005, 04:07 PM
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Glad somebody brought this out... thought I have a gremlin in my MO. I was on a traffic light stop... as soon as I took my foot off the brake pedal, before I can even press the gas pedal there was a surge of power and MO took off. Good thing that I always make a habit to keep a good distance otherwise I could have rear-ended somebody. It's scary though.

I found myself talking to my MO (like a horse......Hooooo...Hoooo. slow down). Too much horsepower there.

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#14 Old 06-17-2005, 05:12 PM
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Sounds like we have a bunch of manual tramission drivers here. I know I was one of them.
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#15 Old 06-17-2005, 05:39 PM
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Quote:
Originally posted by chita1987usa
before I can even press the gas pedal there was a surge of power and MO took off.
I often take off from lights, but yesterday I almost paid the price. Someone too old to drive took a really late red coming off the Route 95 exit ramp, and I had already gotten underway from my green. I had to brake a lot harder than I expected to avoid T-boning this guy, and it felt like the Mo just wouldn't let up. I figure after 47,000 miles, Nancy knows how I like to leave freshly green lights.

If nothing I practically sent him into cardiac arrest, so it wasn't all for naught Hopefully he won't do that anymore.

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