OK, here's the story on my boost - bigger turbo needed? - Saab Performance Bulletin Board

OK, here's the story on my boost - bigger turbo needed? - Saab Performance Bulletin Board - Saabnet.com

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OK, here's the story on my boost - bigger turbo needed? Posted by KevinY (more from KevinY) on Fri, 7 Jun 2002 17:18:03

In Reply to: I think Im blind, nickR, Fri, 7 Jun 2002 16:59:19 Members do not see ads below this line. - Help Keep This Site Online - Signup

As you may or may not know, the Aero comes stock with the Mitsubishi TD04 T15 turbo. This is a nice little hair dryer, but I believe the sustained pressure rating is 1 bar. This does not mean that it cannot spike beyond 1 bar, but it probably cannot sustain it.

The boost pressure actually closely corresponds to the air/fuel ratio in the shape of the curve, but in inverse. Under inital acceleration and as the torque reaches its maximum, the boost reaches its max pressure at 1.5 bar or 23 psi, about 3800 rpms. This is probably when the air/fuel was the richest also. What does this mean, I don't exactly know the correlation. Horsepower continues to build up to red line, but boost pressure begins to taper off to a steady 1 bar or 15 psi.

What I think is probably happening is that the turbo is hit by the initial boost and over shoots. It then recovers and settles to 1 bar. This is just my guess and anyone else is welcome to contribute their knowledge.

Cheers!

posted by 209.157.19...

Posts in this Thread:

Latest results - 301HP, 371 Torque w/ SQR Stage 3, KevinY, Fri, 7 Jun 2002 01:08:07
- Geez, where are all the doubters here?...., Eric Burr, Fri, 7 Jun 2002 13:05:28
  - Yeah, but where's your dyno chart???, John Rose, Fri, 7 Jun 2002 16:12:28
    - Re: Yeah, but where's your dyno chart???, Eric Burr, Mon, 10 Jun 2002 02:51:29
  - hes running 23 psi n/m, nickR, Fri, 7 Jun 2002 13:55:25
    - But it tapers down to 15 where peak hp is!!!! n/m, Eric Burr, Fri, 7 Jun 2002 14:26:26
      - So?? That doesn't mean, AdamB , Fri, 7 Jun 2002 19:14:39
        And the peak hp would me MUCH higher!!! n/m, Eric Burr, Mon, 10 Jun 2002 07:59:48
      - I think Im blind, nickR, Fri, 7 Jun 2002 16:59:19
        Re: I think Im blind, Eric Burr, Mon, 10 Jun 2002 02:53:43
        OK, here's the story on my boost - bigger turbo needed?, KevinY, Fri, 7 Jun 2002 17:18:03 <-- Viewing This Message
        Re: OK, here's the story on my boost - bigger turbo needed?, Karl , Sat, 8 Jun 2002 05:34:25
        You can make even more power with, SteveY, Sun, 9 Jun 2002 10:31:41
- That's a great looking car !! n/m, sean, Fri, 7 Jun 2002 11:43:26
- What's the best way to contact Stromqvist?...., saabaru, Fri, 7 Jun 2002 11:29:56
  - Re: What's the best way to contact Stromqvist?...., KevinY, Fri, 7 Jun 2002 11:47:58
- If you go back to the dyno, it would be interesting to, SteveY, Fri, 7 Jun 2002 11:26:26
- Impressive results, still runing stock hairdyer?, ckpaden, Fri, 7 Jun 2002 11:13:57
- Nice!!, Chad B, Fri, 7 Jun 2002 09:22:30
- Stromqvist is my man!, nickR, Fri, 7 Jun 2002 02:25:58
- Re: Latest results - 301HP, 371 Torque w/ SQR Stage 3, kooch, Fri, 7 Jun 2002 02:08:22
  - I agree - I sent a similar question to Frank n/m, KevinY, Fri, 7 Jun 2002 14:16:35
  - a/f curve, sean, Fri, 7 Jun 2002 10:45:45

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