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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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old part in new box = great surprise for my turbo 928!!
Ok, I wasn't THAT excited about my shakedown dyno passes: my boost controller was not set up right (user-error), and the car *could* have spooled faster, but hey, since I'm running a larger turbo, I chaulked it up to that.
I recently purchased a 944 turbo S, that once received, was determined to be down on power. I checked the BOV (Blow off valve), it was bad. Figures, so, I pulled the one off my 928: it was bad too! Brand new unit I thought: wrong. It was a new box with an old valve in it where someone had purchased a new BOV, then returned it with the old in the box: classic auto part theft. So, last night for the first time, I drove the T928 with a fresh BOV in place: wow, what a HUGE effing difference. Once warmed up, I had full tire smoke at 3/4 throttle in first gear, no traction in 2nd, and spun much of 3rd gear: I've gotta dyno this thing again. Boost controller peak boost indicated 5.39psi. Bottom line: my larger T67 Ballbearing turbocharger spools MUCH faster than my prior T61 non-ballbearing turbocharger. Wow. Incredible torque, very fast spool, and I' haven't even finished my intercooler yet. I can't wait... Mark
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 Last edited by MarkRobinson; 07-15-2008 at 11:18 AM.. Reason: add more |
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07-15-2008, 11:17 AM
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Registered
Join Date: Jan 2005
Location: florida
Posts: 97
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Pictures please!
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07-15-2008, 05:58 PM
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Registered
Join Date: Mar 2008
Posts: 14
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Seems like a pleasant surprise, and sigh of relief as well.
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07-24-2008, 08:42 PM
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Registered
Join Date: Mar 2008
Location: Los Angeles, CA
Posts: 70
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MArk,
how bout an updated dyno run? If my car doesn't find a buyer at the close of the Ebay auction I think i will invest in either some turbo goodies, or go the NA route and look for an X-pipe and some intake mod's. Would love to know where your at now HP wise on 6psi boost.
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1990 928 GT Black/Cashmere |
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07-25-2008, 11:15 AM
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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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Ryan you in-town? There's a ferrari-club breakfast that a few 928'ers are going to, me included. I'd be happy to give ya a ride.
 6psi is stupid quick: I'm still tuning, but I'm having issues getting the 285's to stick at 80mph. I'd say 6psi is somewhere near 440-450rwhp/tq. Mark
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 |
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07-25-2008, 11:37 AM
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Registered
Join Date: Mar 2008
Location: Los Angeles, CA
Posts: 70
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yeah i may take you up on that drive.
I am also planning on throwing in the dual disc conversion i have sitting in my living room if I keep the car, i would love to get your opinions on the earlier DD clutch setup. When and where is this get together?
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1990 928 GT Black/Cashmere |
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07-25-2008, 12:00 PM
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Architecture & Porsche's
Join Date: Jan 2006
Location: Austin, Texas
Posts: 3,189
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LaMadeline bakery, Beecaves & 360 (SE corner of the intersection, in that shopping plaza, all the way on the south end. Starts at about 9:30. I should be there until about 10:30 or so.
I've done about 11 clutche changes outs etc. on the DD 928's, so I can assist ya: not too hard. Mark
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Porsche Club Racing National Scrutineer '89 Andial 951 '82 928R '74 911 RSR 3.6 |
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07-25-2008, 12:07 PM
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