850 NA cams in a Turbo model

code-man850 · Post by **code-man850** » 06 Feb 2009, 16:21

Has anyone heard of performance gains from switching the throttle body and cams off a N/A to a Turbo model 850?

Post by **MadeInJapan** » 06 Feb 2009, 16:36

Not sure...just have read that the NA cams are much more robust, so those running more boost than normal on their turbo engines have swapped theirs out for these.

jaluhn · Post by **jaluhn** » 09 Feb 2009, 00:46

Interesting. Any idea what they mean by robust?

Not sure if the throttle body is any different between NA and turbo. I don't think so offhand, but I'm not sure. If I remember I'll look it up in VADIS tomorrow.
~John

Post by **tailor** » 09 Feb 2009, 06:50

This post here resolves the issue of TB differences between the N/A and Turbo with some additional wisdom from other posters.

https://www.matthewsvolvosite.com/forums ... =1&t=14628

No idea on the cams

code-man850 · Post by **code-man850** » 09 Feb 2009, 09:15

My thinking on the cams idea was that the NA motor is acutally a 2.4L instead of a turbo coupled 2.3L Maybe this would be a question for IPD or something.

code-man850 · Post by **code-man850** » 09 Feb 2009, 09:17

What about a bored out throttle body? Any opinions on this? I wanna get a little more power out of my 855 turbo but not as far as ECU and or an expensive exhaust. Let me know.

dcovey · Post by **dcovey** » 10 Feb 2009, 09:34

I believe the NA cams have a longer duration, which means the valve is open longer, in order to allow the NA engine to breath as efficiently as possible.

check this site for camshaft specifications

http://1800philes.com/ianr/_superlist_grinds.html