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Join Date: Jul 2007
Location: Southwest Montana
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To Rich?

Last week I noticed that my '87 930 was not accelerating as strongly or as smoothly as it had previously. It's as if the carís boost is being restricted when accelerating. The problem is worse now, it is intermittent I do have AFR meter on its way. The exhaust pipes inside are dark in color. I have been paranoid about getting it too lean and think if I am missing it I am missing it on the rich side. I noticed this two weeks ago at the track on 1.6 mile straights. I do not think I am getting any detonation (I have experienced it briefly in air cooled aircraft engines in power descents in the past, scary knocking sounds) I have been very careful to run 100 Octane fuel, it even occurred at the track with 50% 93 octane & 50% 100LL aviation fuel. The car is configured as follows.

1.0bar Boost Spring
Kokeln IC
IA Fuel Head
K27HF Turbo
SC Cams
K&N filter
B&B Headers with Heat
B&B Muffler
1987 930

John Walker did my PPI in July and I think He felt it was to rich at that time. Could it have gotten richer or gone lean ? 1000 miles ago
Whatís going on any ideas? I will check it out when I learn how the meter works.
Your thoughts?
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MT 930
1987 930 - Gone but not forgotten
A man with priorities so far out of whack doesn't deserve such a fine automobile.
I would rather wake up in the middle of nowhere than in any city on earth - Steve McQueen
американский
Old 09-30-2007, 07:58 PM
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Crotchety Old Bastard
 
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How many HP are you pushing?
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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
Old 09-30-2007, 08:13 PM
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PO dyno report @347.00 RWHP.
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MT 930
1987 930 - Gone but not forgotten
A man with priorities so far out of whack doesn't deserve such a fine automobile.
I would rather wake up in the middle of nowhere than in any city on earth - Steve McQueen
американский
Old 09-30-2007, 09:03 PM
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Crotchety Old Bastard
 
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Was the current configuration ever run with a stock fuel head?
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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
Old 10-01-2007, 07:26 AM
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Quote:
Originally Posted by RarlyL8 View Post
Was the current configuration ever run with a stock fuel head?
Yes briefly however the PO's mechanic felt that it was not delivering enough fuel. So they installed the IA head.
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MT 930
1987 930 - Gone but not forgotten
A man with priorities so far out of whack doesn't deserve such a fine automobile.
I would rather wake up in the middle of nowhere than in any city on earth - Steve McQueen
американский
Old 10-01-2007, 07:39 AM
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Got Boost?
 
Join Date: Jan 2007
Location: NH
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race gas will make the car run more rich
if the car was borderline before on normal (90-94) gas this change may be putting you over the edge to where you now feel the loss of power
just a thought
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porsche 930rs
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Old 10-01-2007, 07:52 AM
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How about altitude? the car was set up at sea level. I am operating the car at 5000 ft. In the plane we lean the mixtures out when we reach cruising altitude, keep it rich and cool for the climb. I have no experience with cars. Some one else told me that the octane rating was not as critical at this 5K feet altitude. I am not taking any chances. I am sure the AFR numbers will shed some light on this however i want a better understanding of whats going on. BTW the C02 sensor is unplugged if that helps.

Thanks,
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MT 930
1987 930 - Gone but not forgotten
A man with priorities so far out of whack doesn't deserve such a fine automobile.
I would rather wake up in the middle of nowhere than in any city on earth - Steve McQueen
американский
Old 10-01-2007, 08:14 AM
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Forced Induction Junkie
 
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You have changed two variables which would cause what you're experiencing. Yes, a 5000 foot change will affect your settings, but you also unplugged your O2 sensor. Adjust your AFR and then plug the O2 sensor back in and you'll be good to go.
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Dave
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 10-01-2007, 08:46 AM
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