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KooK
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Post subject: Is this really necessary?  Posted: Tue Dec 30, 2008 5:14 pm |
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Joined: Tue Feb 14, 2006 6:30 pm
Posts: 852
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_________________  1971 VW Bug (Daily Driven) Sorry about the oil spot.
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BGjohnson
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Post subject: Re: Is this really necessary? Posted: Tue Dec 30, 2008 5:39 pm |
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Joined: Thu Mar 30, 2006 9:15 pm
Posts: 2188
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Completely.
_________________
1989 Mustang GT, 408 with full supporting mods...and a shit ton more.
Four-wheeled hellcat from Planet Kickass
1993 Nissan Pickup 4X4, on 31 BFG's!!
1997 Yamaha YZF 1000R, mint cruiser
7.18 in the 1/8 at 103.26mph
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DustinsDuster
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Post subject: Re: Is this really necessary? Posted: Tue Dec 30, 2008 7:05 pm |
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Joined: Sun Mar 05, 2006 4:33 pm
Posts: 886
Location: Marion, Iowa
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just as necessary as this: 
_________________
'72 Plymouth Duster (big block project)
'67 Sunbeam Alpine (drop top cruiser project)
'88 Dodge Ram 50 (DSM mutt project)
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evotuner
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Post subject: Re: Is this really necessary? Posted: Tue Dec 30, 2008 9:05 pm |
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Joined: Sun Feb 12, 2006 9:43 pm
Posts: 317
Location: West Burlington
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sounds like a DSM idling....
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Darius
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 8:32 am |
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Joined: Wed Feb 07, 2007 8:59 am
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QuarterHorse
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 8:48 am |
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Joined: Fri Feb 10, 2006 12:32 pm
Posts: 2829
Location: Des Moines, Iowa
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Darius wrote: Superchargers in parallel make sense, but can someone explain why you'd run superchargers in series for anything other than the "bling" factor? That's all it was. That is a pretty old build. As far as sounding like a DSM idling, hardly. That's just a good ole blower cam with a big huffer causing it to cycle like that. _________________ Ballz Deep Racing '92 SSP - It's Mustang Stock 
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evotuner
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 9:04 am |
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Joined: Sun Feb 12, 2006 9:43 pm
Posts: 317
Location: West Burlington
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No, I think it sounds like a DSM idling still.
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Darius
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 9:29 am |
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Joined: Wed Feb 07, 2007 8:59 am
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QuarterHorse
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 9:59 am |
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Joined: Fri Feb 10, 2006 12:32 pm
Posts: 2829
Location: Des Moines, Iowa
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evotuner wrote: No, I think it sounds like a DSM idling still. Haha your right, I can't believe that wasn't my first though. _________________ Ballz Deep Racing '92 SSP - It's Mustang Stock
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sparkles
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 12:00 pm |
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Joined: Wed May 21, 2008 11:04 pm
Posts: 1562
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Darius wrote: Superchargers in parallel make sense, but can someone explain why you'd run superchargers in series for anything other than the "bling" factor? When you bi-charge something, the reason why this method is preferred over the other is because each supercharger or turbo compresses the air to a certain point, but is equally conteracted by the ambient air pressure, so... if a turbo puts out 30 psi but the ambient air pressure that it must overcome is 15 psi, you'll wind up with 15 psi into the engine. Now, if you take 2 turbos, and put the outlet into the inlet of the other, you will wind up with a higher psi output because of the air being pressurized twice before it is subjected to ambient pressure. Just as and example 30psi + 30 psi - 15psi= 45 psi total. I beleive there's an article on this in an old issue of Super Street. Don't have time to look it up, but anyways, this is why most factory twin turbos are sequential and why aftermarket turbo systems for diesels go this route. _________________ The DS  96% of Americans say... "OHH Sh*t" before going into a ditch. The other 4% are from Iowa and say "Hold my beer and watch this sh*t".
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BGjohnson
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 12:33 pm |
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Joined: Thu Mar 30, 2006 9:15 pm
Posts: 2188
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I think your confusing gauge pressure PSI with bar PSI.
Gauge Psi will read 15 all the time since it doesn't count for atmospheric pressures. Something that is already calibrated for atmospheric pressure will read zero.
So you were just converting from gauge pressure, which isn't needed.
But your right on compounding pressures. Usually it's a bandaid for something that is at max boost. Hence the kenny bell setup with blower and turbo's. Where that Blower would only be able to hit 25-30, then pressure compounded to reach 60+psi.
Or in the case of some new diesels they do it because they wanted to get away from the variable vane turbos and still have good low end boost. Small turbo spools almost instantly giving a few PSI then the big daddy comes in to deliver the rest.
Boost is neat.
_________________
1989 Mustang GT, 408 with full supporting mods...and a shit ton more.
Four-wheeled hellcat from Planet Kickass
1993 Nissan Pickup 4X4, on 31 BFG's!!
1997 Yamaha YZF 1000R, mint cruiser
7.18 in the 1/8 at 103.26mph
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XcreatonX
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 1:38 pm |
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Joined: Wed Feb 08, 2006 2:33 pm
Posts: 336
Location: Cedar Rapids
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this was at the dsm shootout this year 
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XcreatonX
04 evo RS
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sparkles
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 3:12 pm |
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Joined: Wed May 21, 2008 11:04 pm
Posts: 1562
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BGjohnson wrote: I think your confusing gauge pressure PSI with bar PSI.
Gauge Psi will read 15 all the time since it doesn't count for atmospheric pressures. Something that is already calibrated for atmospheric pressure will read zero.
So you were just converting from gauge pressure, which isn't needed.
But your right on compounding pressures. Usually it's a bandaid for something that is at max boost. Hence the kenny bell setup with blower and turbo's. Where that Blower would only be able to hit 25-30, then pressure compounded to reach 60+psi.
Or in the case of some new diesels they do it because they wanted to get away from the variable vane turbos and still have good low end boost. Small turbo spools almost instantly giving a few PSI then the big daddy comes in to deliver the rest.
Boost is neat. Uhh...no. Bar is a unit of measure is it not? The article I read dealt more with the physics on atmospheric pressure versus compressing air via compounding. Not a huge deal. Just wanted to point out that besides the bling factor, there can be a point, although I doubt that's where they were going with that build. _________________ The DS 96% of Americans say... "OHH Sh*t" before going into a ditch. The other 4% are from Iowa and say "Hold my beer and watch this sh*t".
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Darius
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 3:56 pm |
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Joined: Wed Feb 07, 2007 8:59 am
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Sisqo
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Post subject: Re: Is this really necessary? Posted: Wed Dec 31, 2008 5:09 pm |
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Joined: Fri Feb 10, 2006 7:05 pm
Posts: 1595
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I think that everyone one of those guys had to go home and change there pants.
_________________  <---the perfect girl
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