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  #11  
Old 24-12-2014, 07:32 PM
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Dave P Dave P is offline
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Interesting stuff about what people think is correct for the vanos power delivery, worth a read of this site all about vanos repair and especially "symptoms" of a failing unit

http://www.beisansystems.com/procedu..._procedure.htm
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  #12  
Old 24-12-2014, 08:46 PM
Fat Tony Fat Tony is offline
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Well I'll be watching this thread with interest. My S50 pulls smooth throughout with no really noticeable 'jumps' in power at any point

(Rolls Royce vanos if that makes any difference)
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Last edited by Fat Tony; 24-12-2014 at 08:50 PM.
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  #13  
Old 25-12-2014, 02:24 PM
kwoffa kwoffa is offline
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My car also runs smoothly thru all gears,however you can "feel" a difference in the acceleration if you are high revving...my vanos has been re-built using uprated seal's etc....its not a big difference but it is noticable..with faster gains on the rev counter...
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  #14  
Old 21-01-2015, 10:39 PM
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Just to add to the confusion, I've just had the Vanos replaced on my E36. Oddly the step between 'stages' was more obvious when it was not working properly, its now a lot smoother and making ~25 bhp more than it was pre Vanos fix.

To drive it feels like it has more torque down low (which it does) and is smoother in the transition around the 2500 rpm mark.
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  #15  
Old 22-01-2015, 07:34 PM
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Indeed, the whole point of the Vanos is to improve torque across the lower revs, on high revving engines such as these.
My S50 also delivers a fairly linear response across the rev band, in any gear.

Last edited by joao; 22-01-2015 at 07:37 PM.
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  #16  
Old 23-01-2015, 05:58 PM
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So here is a comparison for anyone interested before and after the Vanos replacement. The recent run was with a tank of 95 petrol as I forgot I was getting the car dyno'd and was being cheap. I'll be back with a tank of 98 to see if it makes much difference to the results, however you can see the torque is improved massively across the entire rev range.

The car is an E36 M3 Evo totally stock.

Wheel HP and Torque
Now: Running on 95Ron


Before vanos fix: Running on 98+ Ron



Flywheel HP and Torque
Wheel HP and Torque
Now: Running on 95Ron


Before vanos fix Running on 98+ Ron



Flywheel HP and AFR
Now: Running on 95Ron


Before vanos fix Running on 98+ Ron
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  #17  
Old 23-01-2015, 09:44 PM
mnbrennan mnbrennan is offline
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Makes a big difference then!

Are there any tell tale signs that the vanos is on the way out before the noise comes? My engine can be ticky but on the rhs of the engine bay, not near the vanos. What are the key maintenance jobs on it? Sure this has been covered elsewhere but I'm being lazy, and since mine is the only car I've been in I have no comparator
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  #18  
Old 24-01-2015, 05:13 PM
JuhaV JuhaV is offline
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Quote:
Originally Posted by Dave P View Post
My car pulls through the rev range without big steps at certain revs - I thought this was how the S50 engine runs?
Same here now with a new factory serviced Rolls Royce vanos unit. No noticeable steps, smooth power from idle to redline.

The original was not any more capable to adjust the cams smoothly and continuously due to leaking piston seals. There was not enough oil pressure to move the cams smoothly at low revs and thus the old one adjusted the cams more abruptly.
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  #19  
Old 24-01-2015, 05:26 PM
JuhaV JuhaV is offline
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Quote:
Originally Posted by mnbrennan View Post
Are there any tell tale signs that the vanos is on the way out before the noise comes?
The vanos may be somewhat noisy and the seals might still be ok or vice versa.
After replacing the vanos myself and taking a detailed look into it, I will no more be worrying about some noise if vanos otherwise works ok.

For me, the most prominent tell tale sign was somewhat uneven idle especially during the first 5 seconds after starting. The engine also idled for some time over 1100-1300 rpm before dropping to normal 700-800 rpm.

Another thing was that when turning the front wheels when the car was not moving, the power extracted by the power steering caused the idle to raise up to 900 rpm. The effect was worse if AC was on. Then idle might jump up to 1100-1200 when turning wheels without rolling.

After vanos change, idle is steady and drops to 700 rpm very quickly after a cold start. No "blop" sounds from exhaust, just a steady and healthy humming.

AC I have not yet been able to fully test due to obvious reasons :
https://v2tre.wordpress.com/2015/01/24/lumikissa/
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  #20  
Old 24-01-2015, 05:35 PM
JuhaV JuhaV is offline
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Quote:
Originally Posted by MGR View Post
So here is a comparison for anyone interested before and after the Vanos replacement. The recent run was with a tank of 95 petrol as I forgot I was getting the car dyno'd and was being cheap. I'll be back with a tank of 98 to see if it makes much difference to the results, however you can see the torque is improved massively across the entire rev range.
Easy to believe that effect of healthy vanos into the torque. I have been smiling every time riding the Z3M after the vanos fix.

The difference between RON 95 and RON 98 is really surprisingly large !
I have always used 98 so have not been able to notice that in practise but that large difference would be easy to feel. Will keep using 98 !
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