Timing Retard and extreme boost spike

MAD_TRBO · Jul 26, 2004

Timing Retard and extreme boost spike

I recently retarted by timing to 1 degree BTDC trying to compensate for all the piggy back and larger injector limitations. With this I experienced what I hope to be an anomoly.

I saw boost reach 1.44 bar with the boost controller off and a Tial 40mm external wastegate with a 1 bar spring. I was logging this run and saw no real adverse effects in the form of knock - but I didn't hold it. The boost guage warning light went red and I came off of it.

I haven't had this happen before, typically she'll hit 1.10 and settle to a rock steady 1 bar. Could the timing have something to do with this? I know I saw a post about something similar to this before, but I thought it had more to do with adjustment of the cam sprockets.

Any help much appreciated

Wreckleford · Jul 31, 2004

I think so. When I first setup my AEM EMS I set it to retard very aggresively at the sign of any knock. I experienced the same thing, boost would skyrocket, but the car would still feel slow.

Taboo · Jul 31, 2004

Timing retard and very rich A/F ratio (such as in case of knock) may lead to boost spikes or creep (effect similar to anti-lag).

Timing Retard and extreme boost spike

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