What are the advantages/disadvantages of increasing timing on a turbo Saab? I'm not specifying which car, since I understand that the principles of any Turbocharged car are the same. Any real confident knowledge on this? It seems that the more timing, the better fuel economy and torque you get, but up to a point, since the turbo seeems to spin better with less timing. For example, setting base timing at 20 degrees BTDC and allowing it to remain at 20 BTDC up to whatever max psi of turbo boost you can acheive. As opposed to setting base timing at 20 degrees, then letting the timing retard as boost increases, to say about 10 degrees BTDC at full boost or so. All things equal, isn't more timing an aid in saving gas and getting more for your money also?

Can a person damage an engine by having too much BTDC at any given rpm or boost level? Engine knock and ping aside, because I'm assuming the car's pre-ignition sensors are functioning properly and not letting the car's engine detonate. I have understood that increasing timing also increase heat build up in engine, contributing to engine knock and ping. So, does performance start to drop off at a certain rpm, or boost level if one doesn't decrease timing as rpm's or boost levels rise? It seems with a Turbocharged car, increasing timing helps low end torque and spool up of turbo while top end boost suffers and vice-versa.

posted by 71.56.22...

• Does more timing save gas and increase performance?, drupchen, Thu, 18 May 2006 14:06:08 <-- Viewing This Message
  • Re: Does more timing save gas and increase performance?, Ellwood, Fri, 19 May 2006 04:55:51
    • Not an answer, but still a fascinating video >, Bill Davies, Fri, 19 May 2006 09:12:14
      • Thanks! Lot's of good SAAB videos..., Street, Fri, 19 May 2006 13:42:39
  • Yes, you can damage..., Chaz, Thu, 18 May 2006 16:20:20
    • Holy crud.Where has my head been?This is Perf BB, Chaz, Thu, 18 May 2006 17:07:20
      • You'll NEVER live that one down lol, JordanP, Fri, 19 May 2006 12:29:53

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