But it doesn't differ much. Aka the mk 4 results are as reliable as any dyno can be
Ok so following on from a number of threads , I wanted to try group as much information as possible in one central location. I searched cams and schrick as keywords but the threads that have been displayed are mostly hearsay thus far :
1. I have searched a number of cam threads as I am interested in heading that way , the majority of these threads all have "butt dyno" impressions and good impressions but no validated gains in terms of gains from this mod
2. There have been differing opinions on which cams work best on the 3.2
Dubnick went with 272's all round
Ryan E has gone 268/264
What is the theory behind staggered duration cams? I have only dealt with 8v's in terms of performance cams and the consensus there is the more air you can flow in and out of your car quickly , the more power you will make , therefore long duration and high lift were key on that engine.
What would the "theoretical" benefit be of the different setups ; 268/264 , 268/268 , 272/264 , 272/272 etc?
And lastly , considering the mk5 R32 engine differs to the mk4 R32 , has anyone actually tested these different setups.
No one has really dug into it and tried to compare the differences to see if they were really significant. Did you see this thread? http://forums.vwvortex.com/showthrea...-MKV-R32-motor.............
The most obvious difference was the compression ratio, higher in the MKIV. This was likely achieved with different pistons. According to that thread, other major parts such as the heads and intake manifold dont carry over. It may be marginal improvements or significant changes.
Considering they were rated for the same power, the differences in head and intake manifold could be to offset the drop in compression ratio, though 11.3 vs. 10.85 is not a huge difference, but still significant.
To the all motor gurus, since bore and stroke remained unchanged, would it be safe to assume that if the piston geometry is indeed different, would the jump from 10.85:1 to 11.3:1 compression ratio be a noticeable improvement? Assuming the engine was tuned for the new compression and there was adequate fuel, etc etc.
Well this is the whole concept , no one can clearly confirm that mk4 and mk5 cams are interchangeable.
Some suggest they are the same , however , others such as myself have heard otherwise. We never got mk4 R32's over here so I can't even consult my technician , however maybe someone with ETKA can confirm part numbers for the camshafts on the mk4 and the mk5?
I was hoping this thread could serve as a basis for others who may want further info on cams.
I spoke with REVO UK who sent me the stage 2 tune for my car and the tech there suggested the 268/264 combo as he said the 272 all round setup would be too aggressive as a daily drive.
I just wanna clarify this as the cost of cams and my current exchange rate makes it a very pricey mod
Mk4 and Mk5 exhaust cams are different starting with production year 2006 of the Mk5.
While they are now different the difference has not enough impact that the whole groundwork that power dubs etc did won't apply anymore.
A) do the testing yourself
B) take advice from Jeff
C) just look through the MK4 forum
264/260 was preferred only because these "TT" cams were half of the $ of the Schrick
272/272 made no difference to 268/264 and some were considering changing back to 268/264 just for the sound
For NA 268/264 seems to be the cams to get ( but there is no bad option )
A good read on comrpression ratio: http://www.popularhotrodding.com/tec...ech/index.html
If VW did drop the compression ratio for the MKV, based on that article it looks as though they may have done it due to poor fuel quality and heat. Intake temperatures play a big role on detonation with a high compression motor, as well as fuel octane. As you all know, the R runs hot and west coast U.S. fuel is crap
Based on that difference alone, I would expect the MKIV engine would make at least 2 percent more power at the crank than the MKV. That's at least 5HP more at the crank. Other differences could also affect the power output. What we need is an MKIV guy and a MANUAL MKV guy with identical mods to see if all these differences between the engines really do make a difference.
Another note about higher duration cams: they reduce the dynamic compression ratio. Which means you need to run a higher static compression than before depending on how wild the cams are. This may be part of the reason why 268/264 made the same power as 272/272 on the MKIV platform, in addition to the restrictive intake manifold. Just a thought.
At the last dyno day a stock import mk4 R32 made less power and torque at all 4 wheels than a stock mk5 DSG R32. I expected it to be the opposite , I don't know if it differs over there as your MK4 R32's were stronger than the Euro ones.
I got some good feedbac from Nick too :
Originally Posted by dubnick32
Thanks..good thread topic
I'm still amazed at how little info there is across the range of aftermarket parts available for this car compared to how many people who have bought aftermarket parts. It seems like most MkV R32 owners buy things based on hearsay (or less) or they just don't share the info they have compared to any other platform I've dealt with.
Oh well, good thing there is not really much worth doing to the car to begin with...
If your gas cap light comes on even if you think you tightened the cap, try pulling on the cap as you tighten it. Worked for me.
Help us with suspension specs!
Vag Evolution: MkI Rabbit -> MkII 16v GTI -> B5 S4/MkV .:R32
I just don't work and play well with others. It was a trait first identified to my parents at my preschool. They tried and tried to socialize me.
Finally, they gave up and steered me to a career field where a lack of social skills is the accepted norm.
I am an engineer. And I'm taking my polyhedron and going home.
Since a bunch of us are getting Schrick cams through Ron at Denon Performance, I thought that I would try to get some info together.
Archived thread: http://forums.vwvortex.com/showthrea...!!!-Here-it-is!!!!
Why aftermarket cams?:
Here is the download section of the Schrick web site. It has some additional info, and it is reassuring to see that they do not specify any different valve springs for the 268/264 set.
Also: Note that they seem to have a new variable length intake for the VR6 Do want!
It's like a Christmas Morning.... Just got my Cams...
Now just need to get other parts and find a place to install this baby..
I think I am going to do Dyno before and after the install to see the difference