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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-18-2012, 04:44 PM   #1
SH4DY
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Limits of cams with VANOS

Just wondering if anyone has checked to see how much the VANOS system is able to advance/retard the cams.
Also, are the factory cams heat treated solid cores?
I'm sure Schrick cams or ZHP's are fine for most but I think if our cores our suitable, we could make some pretty wicked regrinds with the lobe profiles available these days and some common sense spec'ing the cams out. They may wind up being cheaper as well...

I'm at a point where i'm wondering about removing the VANOS/DISA stuff all-together. It's more stuff to go wrong and fix and when driving I can feel the car trying to figure out where it should be, playing catch-up. I can't blame the DME as it's processing a lot of information and trying to adjust but its controlling hydraulics and a dashpot which aren't going to react instantaneously. When it finds its rhythm its great but I still don't think you don't need all the gadgetry to have an awesome powerband if you know what you're doing...

I know it's a little off topic but some end user tunable software would be flipping awesome... it's only been what? 13 years since this platform came out?
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Old 04-18-2012, 04:46 PM   #2
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DISA makes free power. If you remove it, your car will make sucky low end. There's a "fix" kit out there for it that should last forever.

Cams are hollow and hardened.

Yes, tunable would be nice, but we'll be beating a dead horse if we bring that up.
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Old 04-19-2012, 08:43 AM   #3
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you aren't going to end up with a broader powerband if you remove vanos/disa. you'll either end up with a really peaky, strung out RPM machine, or something that has low end grunt but chokes up top. that's the entire point of those systems - you'd just be going backwards.
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Old 04-19-2012, 09:24 AM   #4
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Originally Posted by SH4DY View Post
...when driving I can feel the car trying to figure out where it should be, playing catch-up. I can't blame the DME as it's processing a lot of information and trying to adjust but its controlling hydraulics and a dashpot which aren't going to react instantaneously. When it finds its rhythm its great but I still don't think you don't need all the gadgetry to have an awesome powerband if you know what you're doing...
I'm going to go out on a limb and suggest that your car may simply be in need of some maintenance. In over 8 years of ownership, I have never once been able to detect any signs whatsoever of the DISA or VANOS working. They are designed to be seamless in operation when functioning properly.
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Old 04-19-2012, 10:08 AM   #5
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I'm going to go out on a limb and suggest that your car may simply be in need of some maintenance. In over 8 years of ownership, I have never once been able to detect any signs whatsoever of the DISA or VANOS working. They are designed to be seamless in operation when functioning properly.
Maybe he's also confusing the electric throttle lag with the DME trying to "catch up..."
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Old 04-20-2012, 05:08 PM   #6
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Could be dme related as you suggest adam, yet another reason we need tuning.
I also disagree about having a peaky powerband without them: i tuned the 3rd gen hemi vehicles for a couple of years and the 6.1's were within 10% of peak tq for 3k rpms... Thats without vvt. Just a single tb and a well designed im. Look at the ls gm motors aswell.
Yes, with almost 115k the vanos/ disa seals probably need a little tlc but the point of the thread was more to get the think tank started on cams and the limits of what we can run. Ie without locking out the vanos were limited on lift and duration due to the range of advance/retard during start up and operation. Without knowing these limits we dont know where to check p to v or v to v for worse case scenarios

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Old 04-20-2012, 06:07 PM   #7
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Could be dme related as you suggest adam, yet another reason we need tuning.
I also disagree about having a peaky powerband without them: i tuned the 3rd gen hemi vehicles for a couple of years and the 6.1's were within 10% of peak tq for 3k rpms... Thats without vvt. Just a single tb and a well designed im. Look at the ls gm motors aswell.
Yes, with almost 115k the vanos/ disa seals probably need a little tlc but the point of the thread was more to get the think tank started on cams and the limits of what we can run. Ie without locking out the vanos were limited on lift and duration due to the range of advance/retard during start up and operation. Without knowing these limits we dont know where to check p to v or v to v for worse case scenarios

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So are you asking what is the largest cams you can use within the full range of vanos? I want to say it's 272/252 but I'll have to read a again....
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Old 04-20-2012, 07:29 PM   #8
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http://www.hotrod.com/techarticles/e...v10_viper.html
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Old 04-20-2012, 09:26 PM   #9
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......on the double-VANOS system, the timing of the intake and exhaust cams is continuously variable through a range of ~40 crankshaft degrees for the intake, and 25 degrees for the exhaust..... TIS

I dont know who makes cams bigger then 272/256 In/Ex 10.9mm/10.4mm lift for stock motor
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