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Author: Subject: Boost problem
madteg

posted on 30/7/12 at 02:28 PM Reply With Quote
Boost problem

Running megasquirt ecu, did trackday yesturday all well till car started to run weak on boost, checked all vacuum pipes and fittings. Reloaded old map in but still same problem now stuck. Any sugestians welcome. When this is happening the afrs are jumping from 11.5 to 19 and car is stuttering.
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BigLee

posted on 30/7/12 at 02:54 PM Reply With Quote
Fuel filter blocked?
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ashg

posted on 30/7/12 at 03:14 PM Reply With Quote
could be loads of things. check the easy stuff first. fuel pump or fuel pressure regulator, fuel filter, then things like injectors and injector driver in the ecu. are they high z or low z injectors?





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madteg

posted on 30/7/12 at 03:15 PM Reply With Quote
Fitted new filter two weeks ago. Running low z injectors.

[Edited on 30/7/12 by madteg]

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mark chandler

posted on 30/7/12 at 06:06 PM Reply With Quote
Mine did that when the vacumn/boost pipe came loose, the turbo spools up and overboosts hitting the configured overboost limit then the engine cuts out, boost drops and it fires up again, result car leaps forward and stutters.

So check your overboost setting is not very close to the boost you are running and that the wastegate is operating correctly.

Regards Mark

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