968 Supercharger Kit Development
#676
I did have to move it further forward than the manual suggested. What bit of the radiator do you refer to as ragged?
Last edited by edz968s; 05-22-2010 at 02:14 PM.
#677
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The top of the radiator, in front of the lower radiator hose, coming off the t-stat housing, in the photo. Looks a bit chewed up? Maybe I'm not seeing what's in the photo correctly.
#679
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I finally got around to moving my MAF under the front valance and the car is running perfectly now. Before I had a bouncy idle and I had to heel-toe to keep the car running if I lifted the throttle suddenly from high RPM. Now the car never drops below idle speed, no wavering or bounce, no annoyances. If I lift throttle and declutch at 4000 RPM it just drops to idle speed without sagging, dying or any drama.
It's fast too.
I had some scrap 3" intake tubing in the shop so I cut a piece off that had a slight J bend to it and put that in place of the MAF. About an 8" piece fit, I found, after test fitting the rest of the intake plumbing with the MAF refitted after the air filter. I currently have the MAF and filter ziptied to the front valance but it should probably be attached to a bracket or something less flexible and liable to encounter something.
-Joel.
It's fast too.
I had some scrap 3" intake tubing in the shop so I cut a piece off that had a slight J bend to it and put that in place of the MAF. About an 8" piece fit, I found, after test fitting the rest of the intake plumbing with the MAF refitted after the air filter. I currently have the MAF and filter ziptied to the front valance but it should probably be attached to a bracket or something less flexible and liable to encounter something.
-Joel.
#681
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Yes, I tried that honeycomb and it might have helped a little but not a lot. I had been running a Volvo MAF with screen on both ends that had a similar effect, it reduced the idle bounce but did not eliminate it. Currently I am running the Porsche MAF with the air filter fitted directly to it and the two 90 degree elbows downstream of that.
To optimize my setup I think it'd be best to trim back the SC inlet elbow so it points more directly towards the elbow that pokes under the valance and then use maybe a 10" section of 3" tubing where the MAF normally goes. then some sort of more sensible mount for the MAF and filter.
Oh, I am also running a grooved reversing idler, it is not a perfect fit for the belt grooves but I like it better than the supplied idler. Dayco 89012 or Duralast (Autozone) 231082.
http://www.amazon.com/Dayco-89012-Te.../dp/B000C0WOXE
-Joel.
To optimize my setup I think it'd be best to trim back the SC inlet elbow so it points more directly towards the elbow that pokes under the valance and then use maybe a 10" section of 3" tubing where the MAF normally goes. then some sort of more sensible mount for the MAF and filter.
Oh, I am also running a grooved reversing idler, it is not a perfect fit for the belt grooves but I like it better than the supplied idler. Dayco 89012 or Duralast (Autozone) 231082.
http://www.amazon.com/Dayco-89012-Te.../dp/B000C0WOXE
-Joel.
#683
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Nice looking engine bay Ed. Let's see the car.
Last edited by odb812; 05-24-2010 at 10:33 PM. Reason: fixed the wording
#684
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Also that flange on the engine side of the radiator is for the factory fan shroud, which is not used in this application. You could trim it back a ways and pick up some clearance for the SC head, then not have to shift the radiator as far forward.
-Joel.
-Joel.
#687
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For clarification - Carl emailed me and suggested I might have a pre-production version of the air return manifold (what Carl calls the BOV Spill Tube) that lacks a tube to direct the return air straight towards the SC inlet. This is the elbow at the SC inlet that also has a nipple for the recirculation hose.
It appears I do have an early version of this part so the production kits might not have the same idle problems I had.
Also I found a cracked vacuum hose, part of the vapor recovery system, not sure if that had any effect. My vacuum reading at idle was always a bit low.
-Joel.
It appears I do have an early version of this part so the production kits might not have the same idle problems I had.
Also I found a cracked vacuum hose, part of the vapor recovery system, not sure if that had any effect. My vacuum reading at idle was always a bit low.
-Joel.