Actually, what I was thinking-about was the fact that

Actually, what I was thinking-about was the fact that - Saab Performance Bulletin Board - Saabnet.com

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Actually, what I was thinking-about was the fact that Posted by Drew in Houston [Email] (more from Drew in Houston) on Mon, 28 Jun 2004 00:27:27

In Reply to: Re: Wow, ed smith, Sun, 27 Jun 2004 18:38:53 Members do not see ads below this line. - Help Keep This Site Online - Signup

increasing the total area of the delivery pipe interior would require that the Turbo physically pass/compress a higher total volume in a trasient situation. Air is like a 3 dimensional train with loose connections between the cars, so the molecules are relatively loosly packed compared to say hydraulic oil, so when there's starting and stopping in an increased absolute area there HAS to be a coresponding increase in the amount of total area between the individual components that make-up that air---which would directly introduce some decreased level in total system transient response, or actually introduce lag at some level. Same case when an intercooler is enlarged, which is why I asked because I'm planning on an intercooler upgrade; a friend and I were discussing exactly that issue about a month ago and never came to a conclusion. I was curious if you could notice it in real application.

At some point, increaseing the interior size of the post-turbo intake absoultely without a doubt will have a noticeable negative impact on system throttle response, that might be pretty big though.

I would be fun to hook-up a real mondo-huge intercooler setup with precise and repeatable flow control and the total volume of an ice chest or bigger. Do a bunch of transient runs with some way to quantify response time and take a little bit of volume away each run. That might give a curve for a rough equation without a whole bunch of effort and would also zero-out the mechanicl factors. I wonder if it's already been done...

On a different note, you could even time between the throttle and tailpipe on a car and develope a relative scale for toatl responses between particular rpm's. People could talk about that throttle response number similar to the way they talk drag coefficients, skid pad Gs, 0-60s,...

posted by 67.10.24...

Posts in this Thread:

JR Filter and JT Full 3" Exhaust Dyno Results!, Drew in Houston, Fri, 25 Jun 2004 14:10:34
- Re: JR Filter and JT Full 3" Exhaust Dyno Results!, Dean, Sat, 26 Jun 2004 08:51:42
  - Re: JR Filter and JT Full 3" Exhaust Dyno Results!, Drew in Houston, Sat, 26 Jun 2004 09:04:26
- is that at the wheels?, nickR, Fri, 25 Jun 2004 16:39:46
  - Yes, at the wheels, Drew in Houston, Sat, 26 Jun 2004 05:52:53
    - delivery pipe, ed smith, Sat, 26 Jun 2004 07:18:34
      - Wow, Drew in Houston, Sat, 26 Jun 2004 16:38:46
        Re: Wow, ed smith, Sun, 27 Jun 2004 18:38:53
        Re: Wow, Tim, Mon, 28 Jun 2004 10:40:36
        Re: Wow, ed smith, Mon, 28 Jun 2004 12:12:27
        Actually, what I was thinking-about was the fact that, Drew in Houston, Mon, 28 Jun 2004 00:27:27 <-- Viewing This Message
      - Re: delivery pipe, Dennis, Sat, 26 Jun 2004 10:18:44
    - very easy to know, what boost?, nickR, Sat, 26 Jun 2004 06:17:17
      - Re: very easy to know, what boost?, serendipity, Mon, 28 Jun 2004 13:48:59
        No way a stock SRT4 will break into 13's not here in, Drew in Houston, Mon, 28 Jun 2004 15:11:02
        Re: No way a stock SRT4 will break into 13's not here in, serendipity, Tue, 29 Jun 2004 05:32:17
        Point taken, you're talking about the difference, Drew in Houston, Tue, 29 Jun 2004 06:17:03
        Exactly, serendipity, Tue, 29 Jun 2004 09:56:42
        Ok, you've convinced me. From now on I'll have to, Drew in Houston, Tue, 29 Jun 2004 10:16:18
      - How to tell boost? Get a gage I guess..., Drew in Houston, Sat, 26 Jun 2004 06:27:28
        Re: How to tell boost? Get a gage I guess..., serendipity, Tue, 29 Jun 2004 05:36:57
        Yep, and the JT pipe has a 3rd bung already installed, Drew in Houston, Tue, 29 Jun 2004 06:29:56
        gage mounting, ed smith, Sat, 26 Jun 2004 11:19:57
        me neither, nickR, Sat, 26 Jun 2004 07:29:00

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