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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,217
If the WUR you have now is the one that runs off boost pressure for enrichment, you can check that function - CP drop with boost. Bit of fiddling, but you have to hook an air supply into the boost function line to the WUR (with a pressure gauge) - am Mighty Vac (think that is what you call them) will do nicely. Get you CIS gauges set up and measure the warm pressure then pressurize the WUR boost line to you boost pressure. You should see the warm pressure drop by a few psi. Can't remember the exact specs but I think it is around 0.5bar drop for 7 psi boost. That may not solve all the issue, but until you get all these bits dialed in right, you might be chasing your tail (or pushing rope as Brian says).
A number of people on this forum have posted on the lean stumble at tip in. It seems to vary from car to car - ie fuel head/WUR combo - even with the same spec items. Once you get everything dialed in you may be able to tweek it to some extent by running a slightly richer idle AFR - as that is the zone the problem exists in. That tweek won't affect anything in the mid/upper range.
Regards
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:-)
Old 01-22-2014, 09:49 AM
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