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Guys,

Just wondering whether you can help me find a solution as to why my car is strugeling when on WOT.

The car has a 3" Exhaust, Yellow Jackets, Bosch 040, Highflow, new spark plugs & 300zx ecu tuned with Nistune.

It goes fine from about 3000 until i get to about 5000-6000 RPM under full WOT it seems to back off then after goes flat outs again till the redline. this is on about 18-20 PSI..

Regards,

Darren

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https://www.sau.com.au/forums/topic/339109-wot-boost-restiction/
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A boost restriction?

Sounds more tune related than anything else.

To test from exhaust restriction, simply unbolt and do another dyno run. You'll soon see if the problem sits there.

If it doesn't then its tune or some other part having issues.

Nismoid, are you saying it could be an exhaust restriction ie: faulty cat etc?

my tuner sugested it could be jumping to the knock table when it think its a knock but could be a false knockso the ecu pulls the timing which could be filtered??

This pretty much goes over my head unfortunately but i definately could do the exhaust and try a dyno with it out. I didnt see the car dynoed so i wasnt sure it represented it on the dyno or if its just appears on the road?

Darren

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