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Turbo camshafts


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#1
Lionborg

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So i thought i would start this discussion on cams, i haven't been able to really find the answers anywhere so ill just post the questions here.

Ive been lurking around for cams, the past months, i dont really need them but just curious.

How much does it actually benefit our engine, when turbo'ed?

How much will the different cams expand the RPM range? For example the Schrick 272/264 kit.

Should a turbo R have symmetric profiles or asymmetric profiles? and why?

I know theres a lot more air coming thru when the lift gets bigger, but all the "off the shelf" cams seem to have the same lift, 11mm, except the cams with symmetric profiles, for example the 272/272 which only has 10,8mm lift.

Does anyone have a dyno sheet with before/after cams? if so please share

Finally, what is the limit of oem cams? :)


Edited by Lionborg, 04 May 2017 - 06:29 PM.

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#2
mattdub

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CTS turbo seem to do the biggest range of cams I've seen. Know a few guys in the states running 280/264 or 272/264, but always seem to be a symmetric once you go above the 264's.

Sure one guy was running 272/272 and said they performed great :)

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#3
Lionborg

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CTS sell Schrick cams.
Id really like to see a dyno sheet of a turbo (or SC) R32 with 280/264 cams.
My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#4
Lucifer

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Bar-Tek are much cheaper for Schrick cams then CTS 


820 bhp turbo Mk4 Golf R32. Still wanting more power . 
MK4/5 Tubular manifolds,down pipes, de-cats,sport cats plus full exhaust system always for sale please PM me for details.


#5
Lionborg

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Indeed they are, but they only have 268/264 on the website.
My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#6
Lucifer

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Bar-tek can get any camshafts size you want. I have bought 268/264 and 268/272 from him. Just message them what you want. 


820 bhp turbo Mk4 Golf R32. Still wanting more power . 
MK4/5 Tubular manifolds,down pipes, de-cats,sport cats plus full exhaust system always for sale please PM me for details.


#7
Matty.vrt

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Looking at upgrading my cams Lucifer. What gains did you notice and at what rpm range?

#8
Lionborg

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Double post

Edited by Lionborg, 07 February 2018 - 12:54 AM.

My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#9
Lionborg

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To update this:
I eventually ended up buying the Schrick 280/280 cams, and they really did wonders! Much more torque, starting from 3000rpm and all the way out, turbo actually spool a little faster now.
With stock cams, power peaked at 6700rpm and with the 280/280 cams I rev to 7200 and still haven’t hit peak power.
Unfortunately I had too much backpressure so couldn’t go past 600ish HP, but these are the numbers, only the cams and mapping was changed:
Stock cams: 607hp 727nm
280/280 cams: 607hp 790nm
I think I have now solved the issue with backpressure, so this summer I will turn up boost and rev a little more, to really see the potential with these cams.

Edited by Lionborg, 07 February 2018 - 12:54 AM.

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#10
Toffs

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Interesting to hear about the improvements with cams on a Turbo'd engine, well done for taking the plunge !

 

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#11
Matty.vrt

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I have been talking to catcams about some turbo specific cams. Planning on pushing the stock ones as far as I can before I switch, then I will post some before and after graphs.
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#12
Lionborg

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Stock cams can be pushed pretty far, I’ve heard of more than 700hp. But they will limit ft/lbs . I gained more than 60NM (45ft/lbs) at the same boost just by upgrading cams.
My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#13
Matty.vrt

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Here is my graph.

Stock cams
8:1 compression
20 psi
GTX4202R 1.15 turbine

Would be interesting to see how your map differs with your cams.
Attached File  6FC361AF-DEAC-4D23-A03B-093AE7B48513.jpeg   66.73KB   3 downloads

Edited by Matty.vrt, 25 March 2018 - 04:23 PM.

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#14
viw28

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To update this:
I eventually ended up buying the Schrick 280/280 cams, and they really did wonders! Much more torque, starting from 3000rpm and all the way out, turbo actually spool a little faster now.
With stock cams, power peaked at 6700rpm and with the 280/280 cams I rev to 7200 and still haven’t hit peak power.
Unfortunately I had too much backpressure so couldn’t go past 600ish HP, but these are the numbers, only the cams and mapping was changed:
Stock cams: 607hp 727nm
280/280 cams: 607hp 790nm
I think I have now solved the issue with backpressure, so this summer I will turn up boost and rev a little more, to really see the potential with these cams.


Did you have to machine the piston crown at all for these to work? What pistons are you running btw?

Thanks for starting this thread, been wondering what’s best to use for a while now, just not done anything about it yet.

#15
Lionborg

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I didn’t machine the pistons, as I run stock pistons with a 4mm head spacer, so plenty of space down there, but unsure how much clearance there is with low comp pistons and a normal head gasket.
My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#16
viw28

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Yeah, spacer would certainly help in that case!

#17
Lionborg

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There’s plenty of Americans running the 272/272 cams with JE pistons, so I’ll guess that combo works without issues. But I’ve never heard of anyone running the 280/280 with “off the shelf forged pistons”. Maybe I’ll measure the clearance some day, but currently I’m on a mission, push the stock pistons past 700hp.
My mk4 .:R32 turbo build https://www.r32oc.com...tion-r32-turbo/

#18
Matty.vrt

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Sure they is a French guy running 1000+ on standard pistons in a Audi 80 Quattro coupe (maybe S2)




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