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WUR pressure can I raise?

Hi guys
I get a puff of smoke at cold start not oil but full
Pressure is set by Brian at 1.7
How much should I raise it?
Car has K27 I/C
Thanks
Old 08-06-2017, 12:14 PM
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Crotchety Old Bastard
 
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Set it to spec for your year, FD, and WUR. List these and the ambient temperature and I can give you a target.
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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 08-06-2017, 02:42 PM
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It is spot on with the sheet i got with the adjustable wur
I get a ritch puff of smoke at startup ehen cold
Old 08-06-2017, 05:18 PM
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Crotchety Old Bastard
 
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Probably leaky injectors. If the pressure is correct for the temperature there is nothing to adjust.
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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 08-06-2017, 07:32 PM
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Can I test for this with cis gsuges?
Old 08-06-2017, 08:25 PM
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how do you know its fuel?

if its a leaky injector as brian has suggested you need to be careful, if bad enough you could hydro lock and damage the engine. (fuel does not compress).

other things to consider:
is the mixture too rich
do the pumps run with the engine off and key on. see above if you let the pumps run before starting.

try this if you think it is fuel.
pull the connector to the CD off.
turn the engine over for a second or 2.
pull the plugs and look for wet ones.
you could also remove the connector on the CSV, its a pain.

other option is to send injectors off for testing.
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Old 08-07-2017, 04:26 AM
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What color is the smoke?
A quick review:
* dark gray/black smoke is excessive fuel
* blue smoke is oil
* white smoke is water vapor or coolant

When I had stock exhaust, it was common to see some white smoke at cold start-up. It was condensation in the exhaust system.
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Paul B.
'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 08-07-2017, 07:36 AM
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