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Turbo now running rich after sitting for 10 days
Hi folks. So this one has me stumped. You may recall I was talking in a thread a few weeks back about running lean under boost, and determined I would need an adjustable WUR and solenoid.
Well after that I went away on business for 12 days, parked the car in spec, great idle, smoothe hard pull, just a little lean at very high RPMs. Came back, took the car out, and it was immediately extremely RICH, at idle and all thro if I the range, RPM at idle had jumped to 1500 and on boost AFR in the 9’s (was previously 11.5-12. Tried adjusting mixture and idle and it’s all out of spec. Idle now 13.5-14 and on boost still in the 9’s, and bucking. What could have changed? The car was in a dark garage untouched. Could it be an air leak? Or WUR? I’m stumped, and a little frustrated to be honest. Engine is 500 miles into a complete rebuild, every line and hose changed, WUR rebuilt also. At thoughts?? |
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09-22-2022, 05:40 PM
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You really need some fuel pressure numbers. That is the heart of the issue. Eliminate what you can as possibilities then go chasing the rest - air leaks etc.
So you need cold pressure, warm pressure and system pressure. Without that baseline you are shooting in the dark. If you don't have the testing gauges, get some. You will need them in the future if you own a CIS porsche. 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:-) |
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09-26-2022, 12:07 AM
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