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Date: 13 Dec 2004 15:21:05 GMT
From: Dave Hinz <>
Subject: Re: 99 Turbo update - vroom vroom

On Mon, 13 Dec 2004 15:57:41 +0100, Frode <> wrote: > Dave Hinz wrote: > >> So, the inevitable questions. Where is the overboost sensor on >> this thing? It seems to be cutting out the ignition just as I >> get into the "red" on the turbo gauge, rather than up a ways as >> I would expect. > I installed a 900T engine in my 78 99 some years ago, but didn't get > any such luxury as overboost protection -- still I did experience the > symptom as you describe, I think it was the warm-up regulator that was > stuck, leaving too little fuel at high loads. It's a _very_ abrupt cutoff; maybe I'm just hitting the rev limiter. Need to try again tonight and see what RPM it's happening at; I was watching the boost gage rather than the tach. > If you haven't already, try to increase the fuel/air ratio by turning the > adjustment screw 1/4 turn clockwise at a time and see what happens. Which adjustment screw, please? This is a CIS fuel injected system, does that change what you're saying? > Also > check the so-called "control-pressure". If it is too high, as I said, the > engine will run lean at high loads. more than 4 bar is too much. The Haynes > manual for the 99 is quite informative on this part. When cold, it is > approx. 1 bar, increasing steadily to around 4 when fully warm. Sounds like I need a Haynes for the 99T then. My 900 manuals are good for almost everything, but they're too new for some stuff, and my 99 manual is too old for the turbo stuff. Ah well. > PS: Until you get the fuel mix mostly correct, you may find it convenient to > use a set of "hotter" NGK-s than specified, I think I still use BCP6's, > but then in Norway, continuous operation at highway speeds in hot summer > days is soo rare! I put BCP6s in there, which I think is as hot as I should go, yes? Dave

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