Re: Tuning for bigger cams - Saab Performance Bulletin Board - Saabnet.com
NG900 & OG93 |
Vintage Models |
Clubs & SOC |
Other Cars |
Books Movies & Music |
Member Photo Galleries |
Member Directory |
*Buddy Registry |
*Mileage Registry |
What's New |
Photo of the Month |
[Main Performance Bulletin Board | Post Followup | BBFAQ ]
[ Prev by Date ] [ Next by Date ] Member Login / Signup [Most Recently Edited Saabnet.com Photo Galleries]
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
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!
posted by 66.91.209...
Posts in this Thread:
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Your address is: 184.108.40.206 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!