Re: Tuning for bigger cams - Saabnet.com Bulletin Board


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Re: Tuning for bigger cams
Posted by Craig [Email] (more from Craig) on Wed, 16 Sep 2015 12:28:50

In Reply to: Re: Tuning for bigger cams, 85Turbosled, Tue, 15 Sep 2015 15:39:33
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Wow, 100mph in the quarter at stock boost is fantastic.

I think you're good on the timing. I've seen people run more initial and low RPM advance than that if they have a big cam and well over 30 degrees total timing, and that's with pretty high compression. Some of the race guys just lockout their timing at 30+ degrees with no advance curve at all since they have such huge cams and never loading the engine below 3k anyway. All that is without a turbo of course, but is to say don't be a afraid of a lot of off-boost timing with a bigger cam.

Once you start cranking up the boost, you'll really want to back off the on-boost timing though. It's a bit of a fine balance between boost and timing and a little dyno tuning wouldn't hurt there for max power. Water injection gives you a bit more safety margin on the timing too which is great.

Really interesting on the different intake profiles by the way! Never seen that before, but I know pretty much squat on DOHC cam profiles.

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