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Doug Siegel
 
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
fuel pressure readings

I just bought a CIS fuel pressure tester. I know how to hook it up but I have no idea what rate of psi increase I am looking for. Can anyone suggest a link that might display a graph? Many Thanks.
88' 930.

Last edited by dsiegel360; 03-07-2008 at 08:18 PM..
Old 03-07-2008, 08:03 PM
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Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,255
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Does your WUR part number end in 054 or 112? Probably 054.
I hope it is OK to post this page out of my manual. If not I'll just e-mail it to you. This is from an early 930, your '88 should be similar.


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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 03-07-2008, 08:21 PM
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Doug Siegel
 
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
Hey Rarly,
I don't know which WUR I have. I'll look tomorrow. Strangely, I wasn't able to get the graph off this page. It would be great if you could email it to me. Thanks. This chart gives temp : bar. Is there anything that depicts time: bar?....how long should it take for the fuel pressure to move and is it in spurts or steady?

Last edited by dsiegel360; 03-07-2008 at 08:43 PM..
Old 03-07-2008, 08:37 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 a steady progression from ~20psi - ~50psi dependant upon temperature.
The time it takes is also dependant upon temperature. The colder the ambient temperature the longer it takes to climb.
You say you experience a jumpy progression. That is not typical. It could be that you have a sticky gage or an air bubble.
Cold start quality is solely dependant upon the fuel pressure and the cold start valve. I think you have eleminated the CSV as an issue.
Check the chart against your pressure and temperature. It needs to be spot on in the middle of the range to give you best results. I have found that even when all parameters are within spec the system will not run optimally until all are near the middle of spec. I believe that phenomenon is due to component age. Precision is required due to reduced tolerances from wear and age.
Once the car starts cold the AAR and mixture adjustment become important.
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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 03-07-2008, 08:57 PM
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