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 Tue, 15 Sep 2015 09:15:00

In Reply to: Tuning for bigger cams, 85Turbosled, Sun, 13 Sep 2015 12:17:21
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A big cam with lots of overlap will bleed compression at low RPM and allow you to run a lot more timing. Especially on a low compression turbo engine it makes sense that it's a dog off boost (especially before advancing the timing) and a beast on boost. I don't know enough about Saab cam to say if that's too aggressive a cam or not. You might want to talk to the manufacturer about what they had in mind for that cam and how aggressive it's intended to be. The cams are probably designed to be run straight up, but if adjustable cam gears are available and you feel the cams are too much you could try advancing them to bring the power band back down a bit. I'm not sure this will help too much off boost but should wake up the mid range power a bit.

Instead of such advanced timing at high RPM, why not crank up the boost some as well? 11psi is practically stock and given that you're running big cams and programming FI/ignition that thing is asking for big boost. Then you should really have a beast on your hands!

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