|
S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
Information |
|
Cruise control downhill?Views : 662 Replies : 5Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Jun 10th, 2021, 21:29 | #1 |
Member
Last Online: May 27th, 2024 14:19
Join Date: Jan 2014
Location: Bognor Regis
|
Cruise control downhill?
So I was using the cruise control the other day, set it at 30mph going though an area with a thousand speed camera signs and realised the car was holding the speed even going downhill ( My C70 never did that it just sped up! )
The weird part is it didn't feel like engine braking, I could feel a gentle pulsing more like the brakes were being applied, I didn't think the car had anything like that though? Does anyone know how it works? I'm curious now... The car is a 2004 S60 Diesel with the Geartronic box.
__________________
1999 Volvo C70 T5 - Gone but not forgotten! 2003 Volvo S60 Diesel Geartronic - Feels slow... |
Jun 11th, 2021, 12:47 | #2 |
New Member
Last Online: Today 10:12
Join Date: Nov 2020
Location: Leeds
|
I've noticed this on my V70 (2004) on long downhills with cruise on. I'm pretty sure it's just the car feathering the throttle to keep the speed steady. I've not looked into it but I'd be pretty certain these don't have the ability to regulate speed with the brakes.
|
Jun 12th, 2021, 12:27 | #3 |
Premier Member
Last Online: Today 13:57
Join Date: Feb 2009
Location: Hackensack
|
I don't believe there's a brake activation system in our old cars either.
I've chalked up the small rpm adjustments I feel in "near constant speed" operation to the valve adjustment hardware + software. My usual highway run features long rolling hills. I'm quite steady with the foot but use cruise sometimes. Whether I'm using cruise or not seems to make no difference. Downhills produce way fewer of the slight "surge feelings". The small surges made me wonder if the little screen on the cam phaser gasket is clogged a bit. Again, mine's a petrol with only the one cam phaser. |
Jun 12th, 2021, 16:47 | #4 |
Senior Member
Last Online: Nov 14th, 2021 20:50
Join Date: Jul 2008
Location: DARLINGTON
|
The geartronic has torque convertor lock up.
And gives a surpising amount of engine brake I found. |
Jun 12th, 2021, 17:57 | #5 |
trying to be helpful
Last Online: Today 14:24
Join Date: Aug 2020
Location: Dagenham
|
mine is not geartronic, going downhill I definitely feel the cc cut out, the revs drop and it picks up speed a bit (or a lot depending on the hill obviously)
|
Jun 12th, 2021, 18:50 | #6 |
Member
Last Online: Apr 26th, 2024 09:46
Join Date: Jun 2016
Location: Scotland
|
Engine braking on a D5 should be sufficient to hold speed on most inclines, that's what the cruise control uses.
__________________
Current V70III 2.4D (163) SE Sport 4C (2008) V70 T5 (1996) V70 P2 D5 EUIII (2002) XC90 V8 4.4 (2007) |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|