BTM math - Saab Performance Bulletin Board - Saabnet.com
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all turbo act'rs have about 5-6 deg retard, unless defeated.
assume no stock retard, your 2 cases:
1) 20 idle, .25 btm, 15 psi dawes, then at 15 psi the net timing adv is 20 - .25x15 = 16 deg adv, too much and worse if the btm has offset set above zero.
2) 18 idle, .45 btm, 14 dawes, then at 14 psi the net timing adv is
18 - .45x14 = 11.7 deg, and closer to 10-11 target.
some BTMs have an offset screw, that delays retard start until boost is over a few psi.
posted by 52.128.3...
Posts in this Thread:
- What is max amount of retard to run..., lms, Sun, 30 Mar 2003 15:47:32
- I'd stick to one, SLAAB
, Wed, 2 Apr 2003 17:15:05 - I'd stick to one, SLAAB
, Wed, 2 Apr 2003 17:15:00 - Re: What is max amount of retard to run..., lms, Sun, 30 Mar 2003 20:42:46
- BTM math, Kevin K
, Mon, 31 Mar 2003 13:07:19 <-- Viewing This Message - actuator test, davenew, Mon, 31 Mar 2003 07:18:00
- more info.., lms, Sun, 30 Mar 2003 20:37:06
- more info.., lms, Sun, 30 Mar 2003 20:36:55
- Re: What is max amount of retard to run..., Kevin K
, Sun, 30 Mar 2003 20:36:35 - Re: What is max amount of retard to run..., kooch, Sun, 30 Mar 2003 19:24:20
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