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#11
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Re: Better turbo design
Thread is being "stuck". Obviously of great value to the carbed turbo TR community.
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Scott Keller - GNTTYPE Founder & Moderator
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#12
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Re: Better turbo design
Thanks for the Christmas present Scott. This is the only "sticky" in the before black section but I will put more info on here and hope you find it sticky worthy.
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#13
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Re: Better turbo design
I will be very interested in seeing how this works in a draw through capacity! Looking at the maps, I'm wondering if about the vacuum "signal" to the carb and whether it will be able to keep up with the added flow?
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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#14
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Re: Better turbo design
Congrat's Charlie!
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#15
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Re: Better turbo design
Quote:
Warwagon (Adam), my friend Aj in NM, and myself have been playing with this for over 3 years now. Aj's been able to use a 750 Holley spread bore successfully and he was using the original 78-79 system, but he didn't use the stock manifold. One other thing I forgot to add is depending on which system you use will make a difference. The 78-80 use a separate ESC that operates independently and the power valve circuit is routed through a pressure sensing mechanical valve to cut the vacuum signal to the power valve so it goes full rich until the engine has less than 2 lbs of pressure in it. According to GM they called it a PECV valve (power enrichment circuit valve) but it's sometimes called a PEVR valve. You cannot use a normal Quadrajet carburetor with this system. It is specialized and very scarce and has different fuel/vacuum circuits in it. The 81-83 system uses a CCC carburetor that's controlled by the computer and it has an ESC similar to the fuel injected engines. Last edited by charlief1; 12-26-2010 at 06:55 PM. |
#16
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Re: Better turbo design
so if the carb is special and i don't have one, is it safe to say that i could set up an fi system easier than finding the right carb? mine is a 79 4bbl. i have the computer but no carb. i only have a few that work with my BBB430
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#17
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Re: Better turbo design
Quote:
Visit www.beforeblack.net and you can read up on the different designs. Another site you might want to look at http://members.fortunecity.com/petesbuick/ . Pete outlines several different solutions on such parts as the PEVC valve and the turbo control unit. One other thing you might look at is the post I did about the earlier carbs and what they look like. Pretty simple and I've out lined how to make one of the earlier carbs from parts. http://www.turbobuick.com/forums/bef...bo-design.html
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New here but not new to Buicks. |
#18
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Re: Better turbo design
ok. i reread the entire thing. i understand why you chose the specific year components. i was wrong in the year engine that i have( 79) it's all 78.
in the last part where you enlarged the outlet on the turbo foot, how much did you have to remove to have the connection smooth? would it be possible to enlarge the inake hole on the intake manifold? |
#19
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Re: Better turbo design
Quote:
The plenum can be enlarged to improve flow and the inlet of the turbo is enlarged to the same size so it removes some restriction. As far as the foot, all I did was move the mounting feet to make it mount up to the intake. The rest of that area isn't enlarge at all.
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New here but not new to Buicks. |
#20
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Re: Better turbo design
Thought I'd offer some pics of the stock VS the modified turbo and plenum. You really don't get the difference until you see them side by side. The modified turbo is much bigger in comparison. What I've had questioned is opening the plenum as much as I did. What most people don't realize is that the spread bore carb has small primaries which enhances the low RPM response. The small primaries allow for more velocity of the air fuel mixture, and until the need comes up for the secondaries to kick in, it's pretty fast. This helps torque on the bottom and when the secondaries open, you get the big boost off the back 2 barrels.
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New here but not new to Buicks. |
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