Personally I'm not sure that I would bother with adjusting the cam timing on a single cam pulley/sprocket turbo engine, I've not found it to be good value for money. In general on a twin cam turbo engine we advance the inlet, around 4 degrees is common, and retard the exhaust, around 2 degrees is about the limit before the exhaust valves get too friendly with the pistons. The earlier opening inlet and later closing exhaust gives a faster boost build that is quite worthwhile so we get more power at lower RPM, whilst the max power stays around the same so we end up with a slightly more evenly spread power curve ie; not so peaky.
Accomplishing that with a single cam timing adjustment is of course not possible, so the incremental benefit is much smaller. Commonly similar to adding 0.5 psi of boost. Obviously when everything else is done and we want/need some more then maybe adj cam timing get a mention.
Cheers
Gary
Last edited by Sydneykid; 22-06-2018 at 05:22 PM.
Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST
Bookmarks