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Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,208
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exhaust pipe color

Is this a normal exhaust pipe color for a turbo. Jut got done installing new GSF headers and K27s turbo and want to know if it looks lean.
This is a very light grey almost white color to the exhaust pipe and it used to be sooty brown or black with the old 3LDZ turbo and US exhaust.
Just want to know from the group if this looks lean before I burn up the pistons.
Have not made any fuel inj mods.....as I understand I do not need to but am thinking of Brian Leask adjustable WUR in the future.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 10-06-2007, 08:49 PM
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E-85 sippin drunk
 
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Join Date: Jan 2002
Location: Warner Robins, GA
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WHta type of gas are you running??? leaded race fuel? If so, I would have mouse gray soot left over from the lead when ever I used leaded race fuel on my car.. Now, I cant use it, as I am EFI, and use a wideband O2 sensor.....

If you are not running leaded race fuel..... It might take some time to turn the sooty black color.... How much time have you had running it with the new exhaust??
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-35RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 10-06-2007, 08:53 PM
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Smart quod bastardus
 
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Join Date: Oct 2002
Location: Baltimore, MD, USA
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I am running Citgo premium 92 or 93 octane. Nothing special. I only have about 80 miles on the new install, but the color worried me. Especially since the old turbo which had leaky oil selas, had such a sooty black color.
Just wanted to get a feel if this was normal or if I had a lean problem.

thanks,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 10-06-2007, 09:04 PM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
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It is normal for the pipes to turn black under boost when the ratios dip into the low 12s or less. Proper cuising ratios (around 14) will burn grey.
The only way to be certain is to measure the A/F ratios, the pipe colors are only a rough guide.
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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 10-07-2007, 05:11 AM
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