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Discussion Starter #1
Having some trouble after the engine rebuild. The engine misfires and won't rev over 5200 rpm.
The fuel mixture is very rich, about 10-10.5 A/F.
Any ideas what could be wrong? Something that can be easilly missed maybe?

www.gt-r.nu/specs.txt
 

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Discussion Starter #2
Reason for misfire was an airleakage - a turbocharged car most common problem :+)

Nevertheless there is an issue with the airfuel value with very big variations of the afr value - even at idle (~ 11-17 ) . I do not know how the Blitz ECU handles it but on a Montronic there is a feedback of the lambdasignal resulting in variations between 14.5-15 with a periodtime of about one second. Lambdaregulation is on the Motronic active if rev is below approx 3000rpm and load is light (typically vacuum in the inlet) - and conditions above that its using preset values only but again Im not familiar with the function of the GTR/Blitz ecu so if anyone could fill me in I would appretiate it.
 

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Glad that you have got this sorted out mate....cant really help you on the blitz ecu issue as I use a PowerFC at the mo...
 
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