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09-23-2004, 12:23 PM
| #1 (permalink) |
| Registered User Join Date: Sep 2004
Posts: 422
|  small up pipe? What is the deal with my small up pipe? it is like 21/4 "OD. is that a stock size? Also i noticed that the TB was of a small orfice too. How do these things breathe like that? As well as the intercooler necks. Why are all of these things so small? |
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09-23-2004, 12:37 PM
| #2 (permalink) |
| Fuhgeddaboudit  Join Date: Sep 2000 Location: Brooklyn, NY
Posts: 16,162
| Maybe the girls will complain about the small pipe but many have ran in the 10's and the stock throttle body has hit 9's and maybe faster 
__________________ ED BAKER 87-T, Maplight equipped rear view mirror.. 93 PARK AVE"SUPERCHARGED" BPG#1458 My Photo Page   buickperformancegroup.com |
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09-23-2004, 02:40 PM
| #4 (permalink) |
| Member Join Date: Jan 2003 Location: Texas
Posts: 80
| you have to remember that the air entering is compressed 15psi beyond atmospheric pressure. The more you compress the air, the smaller space it takes up (duh!). ;)
__________________ 87 GN with dual catback from monte, big mouth CAI, hotwired walbro 340, kirban adj fpr/guage, world record slowest car yet with maxeffort mafless, BstC boost controller, DS, msd 50lb/hr squirters, rjc power plate, airbags, etc. best/only run so far: 14.6 @ 87mph @ 25+ psi of (accidental) boost on 93 octane. |
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09-23-2004, 03:08 PM
| #6 (permalink) |
| Registered User Join Date: Nov 2001 Location: Raleigh, NC
Posts: 2,098
| jastrckl hit it right on the head. The compressed intake air takes up less room, uses smaller pipes, smaller valves, and had lower velocity than the same weight of air in an unblown motor. The stock Buick turbo was set up for about 12 to 15 psi, depending on various tolerances. The actuator isn't really a precision control, and since there is no "feedback", the ECM doesn't know what the boost is. It will open the boost solenoid based on other things, rather than actual boost. Another thing to think about is the fact that the exhaust pressure is higher than the intake, usually about twice as high. So the exhaust system can use even smaller pipes, valves, etc. There is sometimes mention on the "other board" that exhaust pressure can be lower than intake, but that requires burning massive amounts of a fuel other than gasoline.
__________________ George W- |
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what is stock boost rated at?
Linear Mode
