A.I.D. - Saab Performance Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

Performance Bulletin Board
[Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
A.I.D.
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Jari (more from Jari) on Fri, 3 Aug 2001 05:55:44 Share Post by Email
In Reply to: how do you test timing under boost?, Martin Voshell, Thu, 2 Aug 2001 16:38:00
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

Hi!

A.I.D. might retard timing too much under boost!!! I have tested this using a hand pump and timing lamp. The numbers are averages of three diff. measurements (1bar=14.7psi).

For example, 20 deg. initial adv: 0bar=20deg., 0.3=14.5, 0.5=10, 0.7=8, 1.0=6.5, 1.2=5, 1.4=4

28deg. initial adv: 0bar=28deg., 0.3=21, 0.5=17, 0.7=15, 1.0=13, 1.2=12.5, 1.4=12

We have done several dyno runs with my car using diff. values of initial adv. and 1.1bar max boost. The runs were started using 16 deg. initial adv. and increased 2deg. steps up to 28deg. 16 deg. gave the poorest torque/power curves, 28 deg. the best. For example, 20 deg. initial adv. gave 202hp (crank), 176hp (wheels) and max torque 320.9Nm. Instead, 28deg. gave 224hp (crank), 197hp (wheels) and max torque 333Nm. So, there is roughly 20hp _in free_ if you optimize your timing...

BTW. the highest hp/torque values were dynoed using 28deg. initial adv. and 1.4bar max boost (259hp crank, 363Nm), but exhaust gas temp. rose like a rocket quite high and power/torque curves were poor. I have now pressure relief valve in line with A.I.D. and initial adv. has dropped to 22deg. (the result might be a knocking at a base boost if you using 28deg. initial adv.). The relief valve has set so that the A.I.D. will retard MAX 12deg. under boost.

-Jari-
900S -90
http://y42.photos.yahoo.com/bc/flexibacter/lst?.dir=/My+Photos/saab

Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
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.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
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 - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


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!