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Registered
Join Date: Jun 1999
Location: North Georgia
Posts: 420
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'79 3.3 Turbo - No Spool or Boost, Need Diagnosis Assistance !
Guys,
During the maiden voyage in my 3.3 Turbo transplant it took about five seconds the realize the turbo was not participating. Here are some facts to help diagnose: '79 3.3 Turbo motor, 25k miles, mods are MSD and later style fuel distributor. The turbo was spinning freely when I manually spun it prior to install. It didn't spin easy but did move with a little push it moved fine. I changed the wastegate dump from into the muffler to into the air. The only other possible issue my be the removal of a smog-related cannister which had a broken pipe. I've attached an image of the void from the missing cannister. I closed off the inlets with tin. The only other major issue was a low RPM cough or chatter throughout all gears. This may be related to the Turbo not boosting. I'm not certain. Any help would be appreciated. Thank you.
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2014 911 GT3 1979 930 Turbo 1970 911T 2016 Cayman 2019 Macan |
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03-24-2002, 03:04 PM
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Registered
Join Date: Jun 1999
Location: North Georgia
Posts: 420
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Here's a shot of the Wastegate Mod
The other modification:
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2014 911 GT3 1979 930 Turbo 1970 911T 2016 Cayman 2019 Macan |
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03-24-2002, 03:06 PM
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Crotchety Old Bastard
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Your persistence will pay off!
I can't make out the canister thing. Where at on the engine is it located? I asume you have checked the wastegate to see if it isn't dumping all the time. You are certain that the turbo is not spooling? Not a fuel related issue? These CIS systems get real ugly when air is introduced. I changed out the fuel pump on my SC once, it ran as if on 5cyl and 50hp for a couple of miles before it spit out the air and immediately ran as before.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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03-24-2002, 03:15 PM
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Registered
Join Date: Jun 1999
Location: North Georgia
Posts: 420
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Rarly,
I'm not sure it's not a fuel issue. The cannister runs parallel to the inside of the passenger side thermal reactor. You can see the oil return tubes in the photo. What is the best way to test the wastgate ? Any input would help. Thanks Brian, how's your project going ?
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2014 911 GT3 1979 930 Turbo 1970 911T 2016 Cayman 2019 Macan |
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03-24-2002, 03:42 PM
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Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,490
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the turbo must spin freely.
do you feel any exhaust out the wastegate pipe at idle and low rpm? you shouldn't.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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03-24-2002, 04:17 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
