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hello everyone, i got this info from this company called Perrin that claims on the EJ20 wrx motor cylinder number 3 runs lean and as you add upgradeit gets worse, is that true? wouldnt that effect the cylinder that shares the same fuel rail on the same bank? i was under the assumption that fuel pressure should be the same on both sides of the fuel rail. could it be caused by the fuel mapping error under certain conditions? if it is true why is that happening? i am alittle confused about this statement made by this company, any reply on this will be great.... :eek:

http://www.perrinperformance.com/


Billy
 

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From AutoSpeed http://www.autospeed.com/cms/A_1601/article.html:
Cylinder number three - the one nearest the turbo - is almost invariably the cylinder that gives trouble in GC8s. There are numerous theories, but it seems the problems are linked to lean mixtures and/or detonation in that cylinder. Number three is the last cylinder to receive fuel from the rail and we've heard any drop in fuel pressure means it starves.

The best measures you can take are ensure there's adequate fuel flow at all times (perhaps using an electric fuel pressure gauge in the cabin), ensure the number three injector isn't clogged, use the highest octane fuel available (hopefully better than 96RON) and keep intake air temperatures as low as possible. It's also a good idea to check the condition of the hose connecting the intake manifold to the fuel pressure regulator - these can split with age, potentially reducing the manifold pressure applied to the regulator and, therefore, causing lean mixtures under load.
Also, this forum has some info on the problem. http://www.vividracing.com/cgi-bin/cutecast/cutecast.pl?forum=39
 
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