Re: Finally a way to understand this oxygen per volume.

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Re: Finally a way to understand this oxygen per volume. Posted by vigge [Email] (more from vigge) on Mon, 3 Apr 2006 12:13:55

In Reply to: Finally a way to understand this oxygen per volume., John Williams

[Profile/Gallery] , Mon, 3 Apr 2006 08:55:40 Members do not see ads below this line. - Help Keep This Site Online - Signup

copy and paste for additional clearing.

for crist sake Jonh please read the old treads and see if this very same information has been written in there in one form or the other, with the help of lawn movers, marathon runners, burning fires, airplane cocpits etc.

But lets look at the std viggen again, does it really increase boost? Yes it does, but how is boost measured? IN RELATION TO THE AMBIENT PRESSURE.
Second guestion, does std viggen increase manifold absolute pressure?
Hardly if altitude does not go crazy. We know at sea level it runs ~1bar of boost and at 3000m elevation it will run 1.4bar boost. Difference in ambient prssure 0.3bar. So if the MAP is at 2.0bar at see level it will be 2.1 at 3000m elevation, which is roughly double to where you're located. Climb rate for the boost will increase with altitude, due to other factors which step in, like the rasing manifold temp.

As you have stated several times, please correct if I'm wrong but your MAP is about the same as it is at sea level for a similar tune. A T7 car would basically behave the same as your, run the same MAP.

If you compress the air more you will get more heat, but how many times have I asked you to MEASURE your intake temps to get to the bottom of this matter. You have a big IC right? It has a big heat sink, right? Will the IC work just fine for a short period of time even with out barely any airflow through it, like through a short dynorun. It is a heatsink and what does it do, it absorbs heat and trust me it will cool just fine for a period of time depending on the thermal mass it has. Add some flow, even if it is thinner, it will buy time, enough to get through a dyno run IMHO.

The second thing that will happen is increase in turbine back pressure, decreasing engines capability to "breath". So you VE will go down, but how much is the guestion.

my 0.02

posted by 81.197.250...

Posts in this Thread:

how is boost measured?, LesH, Sat, 1 Apr 2006 14:22:01
- Power Loss at altitude, nikos, Sat, 1 Apr 2006 18:09:17
  - also intercoolers become less efficient, jak , Sat, 1 Apr 2006 21:22:51
    - keeping it simple, vigge, Sat, 1 Apr 2006 23:28:09
      - I would never argue how much is lost, jak , Sun, 2 Apr 2006 09:13:06
      - To add to the above, Vigge, Sun, 2 Apr 2006 08:32:25
    - Re: also intercoolers become less efficient, soneway, Sat, 1 Apr 2006 23:26:46
- Re: how is boost measured?, Dean, Sat, 1 Apr 2006 15:36:25
  - Less oxygen per volume..., John Williams , Sun, 2 Apr 2006 09:07:57
  - Re: how is boost measured?, Vigge, Sun, 2 Apr 2006 03:23:34
    - Re: how is boost measured?, Dean, Mon, 3 Apr 2006 23:03:04
    - short overlap :-), jak , Sun, 2 Apr 2006 21:13:34
    - Re: how is boost measured?, vigge, Sun, 2 Apr 2006 08:28:04
      - thats a valid point on pre turbine exaust pressure, jak , Sun, 2 Apr 2006 11:57:31
        oops, jak , Sun, 2 Apr 2006 11:59:46
        A good link about this, SteveW, Sun, 2 Apr 2006 16:12:00
        02 not constant by volume..., John Williams , Mon, 3 Apr 2006 08:17:06
        Finally a way to understand this oxygen per volume., John Williams , Mon, 3 Apr 2006 08:55:40
        Re: Finally a way to understand this oxygen per volume., vigge, Mon, 3 Apr 2006 12:13:55 <-- Viewing This Message
        do you have the slip on this viggen at 5000 feet?, jak , Mon, 3 Apr 2006 20:35:00
        Re: do you have the slip on this viggen at 5000 feet?, vigge, Mon, 3 Apr 2006 23:20:55
        yeah I asked back trhen but never got them, jak , Mon, 3 Apr 2006 23:28:52
        I dissagree, SteveW, Mon, 3 Apr 2006 14:24:49
        Re: I dissagree, Vigge, Mon, 3 Apr 2006 22:47:36
        Ok, SteveW, Mon, 3 Apr 2006 16:31:38
        Re: Ok, vigge, Mon, 3 Apr 2006 23:18:32
        Re: Finally a way to understand this oxygen per volume., John Williams , Mon, 3 Apr 2006 14:14:43
        Re: Finally a way to understand this oxygen per volume., vigge, Mon, 3 Apr 2006 23:26:31
        Ok Vigge, will you help me figure all this out?, John Williams , Tue, 4 Apr 2006 09:11:44
        Re: Ok Vigge, will you help me figure all this out?, Vigge, Tue, 4 Apr 2006 10:04:26
        Re: Ok Vigge, will you help me figure all this out?, John Williams , Tue, 4 Apr 2006 15:48:46
        Re: Ok Vigge, will you help me figure all this out?, vigge, Wed, 5 Apr 2006 13:35:56
        Re: Ok Vigge, will you help me figure all this out?, John Williams , Wed, 5 Apr 2006 14:07:39
        Re: Ok Vigge, will you help me figure all this out?, Vigge, Wed, 5 Apr 2006 14:20:01
        Well, I will say this, its hot!!!, John Williams , Fri, 7 Apr 2006 08:22:42
        Re: Well, I will say this, its hot!!!, vigge, Fri, 7 Apr 2006 12:23:30
        Re: Well, I will say this, its hot!!!, John Williams , Sat, 8 Apr 2006 06:07:04
        Re: Well, I will say this, its hot!!!, vigge, Sat, 8 Apr 2006 12:24:38
        Mid-way on delivery pipe is 142F, John Williams , Sun, 9 Apr 2006 13:03:59
  - absolute pressure, jak , Sat, 1 Apr 2006 21:11:16
    - Re: absolute pressure, TML , Mon, 3 Apr 2006 02:15:43
      - yeah I think you are rite pre98, jak , Mon, 3 Apr 2006 09:22:35

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