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3.3 Turbo exhaust glowing hot

I have a 74 911 I recently dd a full engine swap out of an 89 3.3 turbo. The engine in the 89 was totally stock when I pulled out assembly with all wiring, oil lines, tank, etc. before putting engine inu car I put full headers on the car, quick spool factory turbo from rarly8, bigger intercooler, tial wastegate, and a custom dual exhaust with magnaflow stainless camarillo style muffler. I have a c2 turbo body kit on car so I had to make custom exhaust. I had a friend of mine who is very knowledgable with these cars help me tune it. We got rid of all emissions air tubes and oxygen sensor. He grounded out a wire and manually adjusted mixture. He said he has done this many times. Car sounds good and makes good power. The exhaust gets glowing hot very fast and even turbo housing! I am very nervous to do any damage. We have checked timing multiple times and he has adjusted mixture to the correct point according to him. Any help would really be appreciated! I have so much money and time into this project I don't want to hurt anything. Thanks,
Pete

Old 04-10-2012, 11:55 AM
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I have also checked for vacuum leaks as well and none found.
Old 04-10-2012, 11:59 AM
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Check this:
Porsche Hot Exhaust on the Dyno - YouTube
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Old 04-10-2012, 12:02 PM
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It might be worth trying to measure EGTs. FWIW, mine run to 900 deg C on the track. No melt downs yet. I think that equates to about 1650 F.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 04-10-2012, 04:47 PM
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I'm no expert on turbo cars but isnt that sometimes down to retarded ignition or advanced cams? Fuel still combusting while the exhaust valves opening?
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Old 04-10-2012, 05:39 PM
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Do you have adjustable WUR and Air Fuel ratio gauge?

Where is your timing now?
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Old 04-10-2012, 09:15 PM
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i would be real careful looking for vac leaks with carb cleaner. make sure your AFR is correct
i rest mine and problem solved
Old 04-10-2012, 09:18 PM
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I was told back racing many years ago that my car looked like a flying saucer at-speed because of the yellow/orange glow under the car while on the throttle. I was going 150 one time when a friend of mine passed us doing 180+ in my car: all I saw was the glow.

I got another 200k miles out of the factory 3.3l CIS before I swapped in a built T3.6.

Mark
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Old 04-11-2012, 05:39 AM
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I am just nervous about the turbo housing itself glowing?? That just seems awfully hot. The timing is set at 10 degrees atdc +/- 2 degrees
Old 04-11-2012, 06:27 AM
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Thats your problem right there. 10 degrees ATDC at idle is very retarded timing from my experience. Even though the factory may have indicated this as spec.....it was for emissions purposes which you no longer are worried about.
Try running 0 degrees at idle to start. This should eliminate the glowing and the car will run much better at low rpm. Just make sure the timing at 4000rpm is correct and that your boost retard function is working properly to avoid too much advance under boost.
Let us know if this fixes it. And watch for detonation and your AF ratios.

If you are worried about advancing timing too much too soon try running 2 degrees ATDC and see if the glowing is reduced and how the car performs. You should be surprised.
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Old 04-11-2012, 07:12 AM
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I agree with Fred - the timing number you indicate is way off . . . factory spec is 26 degrees advance at 4000rpm.
Old 04-11-2012, 07:15 AM
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Ok I just talked to my buddy and he said timing is dead on that was the factory spec he gave me. He said it is at 2 degrees advance. Could it be leaning out for fuel on boost? And fine at idle? I am only running one fuel pump and it is older style mounted down low on near drivers rear suspension. The car doesn't fall on its face or misfire under boost which makes me think it is NOT leaning out?
Old 04-11-2012, 09:04 AM
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My friend and his father work on these cars all the time and he assures me the timing and mixture are good. He says he has never ran into a problem like this before. When I initially had my custom exhaust on it was ripping hot out one tailpipe and cold out the other. The headers would get glowing at idle. He thought there could be restriction in exhaust. We took off that setup and ran straight pipe off Turbo. Now it doesn't heat up at idle just after a 5 min ride under boost. Any help would be great!
Old 04-11-2012, 09:08 AM
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So are you saying that it is currently set to 26 degrees advance at 4000 rpm?
Old 04-11-2012, 09:45 AM
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Here is a thread to look at:

Red Hot Exhaust Pipe

I remember reading a thread in the 911 form (don't know why he posted it there) where a guy had the exact same problem you described and was able to resolve it (haven't been able to find it yet, but will keep looking) . . .

I just made a thread on the 911 forum asking for help in finding the above thread I refered to . . .

Here it is - someone else found it!

Glowing Exhaust!

Last edited by Ronnie's.930; 04-11-2012 at 12:33 PM..
Old 04-11-2012, 10:00 AM
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Yes I believe so which is 2nd mark on crank pulley?
Old 04-11-2012, 12:38 PM
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Thanks for looking for that info Ronnie.
Old 04-11-2012, 12:38 PM
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You probably have a type 68 engine? ie 930/68
In which case you should have 2 deg ATDC at idle (with vacuum connected, and 26 deg at 4000 rpm.
Do you have a different engine number? the number is stamped on the RH fan support housing - by the oil sender. If you had a chance to measure EGTs under these conditions that would provide a definitive answer.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 04-11-2012, 01:01 PM
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Quote:
Originally Posted by Alan L View Post
You probably have a type 68 engine? ie 930/68
In which case you should have 2 deg ATDC at idle (with vacuum connected, and 26 deg at 4000 rpm.
Do you have a different engine number? the number is stamped on the RH fan support housing - by the oil sender. If you had a chance to measure EGTs under these conditions that would provide a definitive answer.
Alan
Alan, for the sake of friendly discussion (and maybe I will learn something), isn't the 2 degree @ idle number unimportant as long as the 26 degree at 4K rpm is achieved?
Old 04-11-2012, 02:52 PM
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Yes, probably - given his turbo is probably heating up under high load - altho I think he posted earlier the headers glowing at idle?
but if he is getting 26 deg adv at 4000 rpm, and is at 10 deg ATDC at idle, I think this means he would have a strange map in the dizzy. I think if the dizzy map is stock, one should follow the other - 2 ATDC deg at idle, and 26 deg BTDC at 4000.
Fredmeister might be able to confirm this.
Alan

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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 04-11-2012, 03:06 PM
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