olie05 Posted January 13, 2005 Share Posted January 13, 2005 I was in the garage looking into my spare intake manifold. I opened the throttle to WOT and I realized for the first time how much area the throttle pivot point(?) takes up in relation to the opening of the throttle body. (Stock throttle body) Since this is a spare.... I decided to file down the excess material that is not needed and is only blocking the flow of air... I am essentialy making the air flow easier over the throttle plate at WOT. Am I crazy or will this actualy work a little? -Oliver Quote Link to comment Share on other sites More sharing options...
zcarnut Posted January 13, 2005 Share Posted January 13, 2005 I have noticed this as well. Nissan uses a 10mm diameter throttle shaft. All of the other similar sized throttle bodies (from other manufacturers) I have inspected have a 8mm diameter shaft. On a 55mm diameter Nissan throttle body the throttle body the shaft takes up over 23% of the available throat area! Even on the 60mm diameter 240SX throttle body the number is still over 20%. I plan to “section” my shaft by removing haft of the shaft where the throttle blade goes through it. The head of the blade securing screws now make contact only with the blade. The other half of the shaft (where the screw threads are) I will leave alone. I will also replace the throttle blade screws with “button head” screws which have a lower and more aerodynamic shaped head. Since I am reducing the effective width of the throttle shaft from 10mm to 6mm, this will reduce the area taken up by the throttle shaft to under 15%. Quote Link to comment Share on other sites More sharing options...
olie05 Posted January 13, 2005 Author Share Posted January 13, 2005 Good idea with the sectioning! So far I have only ground down the area to as little as i thought possible while still keeping both sides of the shaft intact. Tonight I will remove the rest of it! I'm realy interested in what this would translate as horespower numbers. 1-2hp, probably less? Quote Link to comment Share on other sites More sharing options...
Guest 240zJake Posted January 13, 2005 Share Posted January 13, 2005 Pics of the mods? Quote Link to comment Share on other sites More sharing options...
zcarnut Posted January 14, 2005 Share Posted January 14, 2005 Pics of the mods? Quote Link to comment Share on other sites More sharing options...
Guest rick458 Posted January 15, 2005 Share Posted January 15, 2005 Jake have you considered a countersink style screw and champhering the throttle plate holes slightly, and trimming the srew bottoms up to the shafts Quote Link to comment Share on other sites More sharing options...
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