Aftermarket FI with Single Throttle Body, getting started ... |
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Aftermarket FI with Single Throttle Body, getting started ... |
SirAndy |
Aug 21 2005, 11:52 PM
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#1
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
sooooo, as some of you might know, i have been tinkering with the idea of putting a FI system on my hot cammed 2056 that utilizes a single throttle body and long intake runners (similar to the stock D-Jet setup).
the idea is that long runners promote more low end tourque (gud for AX) and the single throttle body makes tuning *much* easier ... the initial idea was to reproduce the stock 2.0L runners with a larger OD for the bigger displacement engine plus a bigger size (volume) plenum. this proved somewhat difficult and the quotes i got for fabbing such runners where in the $1500 - $2000 range for a "test" set. (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif) so i consulted a pro, and we came up with a slightly changed attack plan: - short carb intake manifolds with welded on injector bungs - cylindrical plenum on top of the manifolds on each side - horizontal runners to a single center plenum - single throttlebody all sizes/volumes/length/dia. has been worked out to fit engines from ~2056 to ~2270, for bigger engines sizes would have to be changed ... well, so far, the short carb intake manifolds with welded on injector bungs have been finished and they turned out great. i hope the rest will follow soon (mostly held up by $$$ at this point) attached are a few pics of the intakes and a schema of what the complete system will look like ... (IMG:http://www.914world.com/bbs2/html/emoticons/welder.gif) Andy the manifold with the injector bungs welded on: (IMG:http://www.914world.com/bbs2/uploads/post-11-1124689756.jpg) injector angle, pretty much a straight shot at the valve: (IMG:http://www.914world.com/bbs2/uploads/post-11-1124689795.jpg) closeup of the bung: (IMG:http://www.914world.com/bbs2/uploads/post-11-1124689837.jpg) quick photoshop mockup of the layout: (IMG:http://www.914world.com/bbs2/uploads/post-11-1124689719.jpg) |
Trekkor |
Sep 4 2005, 09:48 PM
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#2
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Andy, news for you.
I spoke with Andy at the RR-PCA a/x yesterday about his set-up. He has a red 914 with and oversized FOUR as well. (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) He runs a 2270cc with modified D-jet. Volvo throttle body, "early" injectors, fuel pressure set to 35psi and a resistor wired in line to the CHT sensor. His car runs perfect and sounds great. He has TTOD's at the a/x so it's for real. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) I can get more info if you want it. So much for D-jet on 2056's and smaller, eh? He has it all figured out. KT Attached image(s) |