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about the altitude
Posted by vigge [Email] (more from vigge) on Sun, 11 Dec 2005 21:44:39
In Reply to: Re: T-5 compensate for a Mile high?, John Williams
[Profile/Gallery]
, Sun, 11 Dec 2005 14:41:26
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"I know they advertise how well the t7 Viggen does at high altitude going from 10-12psi at sea-level to 20psi from 5000 to 10,000'ams.... Is t5 that far behind and such an old dinasaur??? I sure hope not"
the viggen hardly makes any more manifold ablosute pressure at altitude as what it makes aroud sea level. In some rererence they suggest 1.1bar for sea level and 1.4bar for 3km altitude.
We also know that the pressure is rougly 1013mBar at sea level and 700mbar at 3000km. Difference there for is ~300mbar, ie the sáme as 1.4-1.1bar.
T5 can do the same by holding the manifold absolute pressure constant.
Of course the T7 is more "clever" since it holds the airmass flow constant, there for it will also compensate for humidity, airtemp and basically for the compressor effieciency at altitude as well.
The lambda loop will correct mixtures during closed loop, but the connection to WOT maps may not always be so strait forward.
and what comes to this saab shop, I would first ask for the full write up and detailed info what they're going to do to your car if brough in before leaving it there. They might just as well "correct" your SW, ie. make it stock ;)
posted by 81.197.81...
Posts in this Thread:
- john williams pulls only change 9 psi base boost, jak
, Thu, 1 Dec 2005 10:47:40- JAK...., Vigge, Mon, 5 Dec 2005 03:24:44
- I know you love me :-), jak
, Tue, 6 Dec 2005 20:13:50- Re: I know you love me :-), Vigge, Tue, 6 Dec 2005 23:34:03
- Im gona get some viggen #s from 5000 ft if possible, jak
, Wed, 7 Dec 2005 06:04:12- Re: Im gona get some viggen #s from 5000 ft if possible, vigge, Wed, 7 Dec 2005 12:13:51
- It's all about pressure ratios, SteveW, Wed, 7 Dec 2005 07:48:54
- Re: It's all about pressure ratios, Vigge, Wed, 7 Dec 2005 11:33:12
- I keep forgetting to talk about the compressor wheels.., John Williams
, Wed, 7 Dec 2005 21:37:05 - Turbo car and pressure..., John Williams
, Wed, 7 Dec 2005 21:12:55- some more, vigge, Fri, 9 Dec 2005 05:39:10
- Sounds about right, I just pulled the specs at 300hp., John Williams
, Fri, 9 Dec 2005 13:44:33- Re: Sounds about right, I just pulled the specs at 300hp., Terry, Fri, 9 Dec 2005 21:12:12
- Also....., Terry, Fri, 9 Dec 2005 21:47:24
- Thanks Terry, thats the answer I was looking for...., John Williams
, Sat, 10 Dec 2005 10:06:48- A/F, vigge, Sat, 10 Dec 2005 11:14:15
- Re: A/F, John Williams
, Sat, 10 Dec 2005 16:32:03
- also just to be clear, jak
, Fri, 2 Dec 2005 08:11:38 - what I know is on there?, jak
, Thu, 1 Dec 2005 15:50:21 - Re: john williams pulls only change 9 psi base boost, nathanb, Thu, 1 Dec 2005 10:59:49
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