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Apr 29, 2008 | 07:52 AM

#1

dsquared

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Elder User

Joined: Mar 2008

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From: Ontario, CA

Is this normal??

When I start to brake my 7.3 PSD Ex, the rpm will drop. I can be cruising at 70 on the freeway, and if I put my foot on the pedal just enough to slightly depress, but not enough pressure to try to stop seriously, the revs go down from 2100 quickly. I take my foot off the brake, and the revs are back! It's almost like it goes into neutral or something.

I've looked around a little, and haven't found any mention of this occuring. Anyone know anything about this? Happening to anyone else?

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Apr 29, 2008 | 11:14 AM

#2

BobBarry

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Joined: Nov 2003

Posts: 423

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From: Providence, RI

Quote:

Originally Posted by dsquared

When I start to brake my 7.3 PSD Ex, the rpm will drop. I can be cruising at 70 on the freeway, and if I put my foot on the pedal just enough to slightly depress, but not enough pressure to try to stop seriously, the revs go down from 2100 quickly. I take my foot off the brake, and the revs are back! It's almost like it goes into neutral or something.

I've looked around a little, and haven't found any mention of this occuring. Anyone know anything about this? Happening to anyone else?

That's probably the effect of the torque converter unlocking when you brake, and locking back up when you take your foot off the brake, and the driveline spinning it up to its cruising speed.

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Old

Apr 29, 2008 | 11:42 AM

#3

dsquared

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From: Ontario, CA

Quote:

Originally Posted by BobBarry

That's probably the effect of the torque converter unlocking when you brake, and locking back up when you take your foot off the brake, and the driveline spinning it up to its cruising speed.

So, normal then?

I wasn't sure, and like I said, I haven't seen anyone else ask. I didn't know that the brake pedal unlocks the T/C.

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Old

Apr 29, 2008 | 11:44 AM

#4

BobBarry

Senior User

Joined: Nov 2003

Posts: 423

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From: Providence, RI

Sorry, yes; that is absolutely normal.

If the TC did not unlock when you hit the brakes, you could stall the engine in an emergency stop that locked up the wheels.

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Old

Apr 29, 2008 | 11:25 PM

#5

gabeyd

Mountain Pass

Joined: Sep 2006

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My favorite part of my DP tuner is that it changed how this works (even on the stock setting). It is so lame to be going down a hill, engine braking, and then tap the brake to slow down a bit more, and have the torque converter unlock.

With the DP tuner, it doesn't unlock the torque converter until you are under a certain speed...

I'm sure someone here knows more about it...

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Old

Apr 29, 2008 | 11:28 PM

#6

weekendwarriorfsw32

Master of Strokes

Joined: Mar 2007

Posts: 6,808

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From: CA

Club FTE Silver Member

Ya its completely normal and I to like how the Dp tuner keeps the tc locked longer its great

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