strange experience twice now

[michaelb]

it does feel like a sudden fuel cut....no power for 0.5 seconds and back to normal...but I am stepping on it big time in 5th gear  
Regards,
Michaelb

Exactly, in 5th gear there is more load which would also give more time to boost creep slightly and hit fuel cut. This is exactly what used to happen to my car 7 years ago while i was still close to stock - fine in the lower gears and fuel cut in the higher gears. Take it as you will

[Carl]

I heard a grinding noise( not a bang )  for a split second and the car defiantly pulled back…Quite a nasty noise possibly coming from somewhere behind me under the car.


The engine was rebuilt about 2 years ago and the car just had an engine service at Rotechnics.



Regards,
Michaelb

Did it sound like someone dropping a load of nuts and bolts into the exhaust?Like a mettallic loud rattle? If so it to me would still be det.
Regards
Carl

[michaelb]

I had a service at Rotechnics about 5 weeks ago...

Also, when did you last change the fuel filter and plugs?

[michaelb]

Hi Carl

no rattle just a deep grinding noise for 0.5 sec..
Regards,
Michaelb

Did it sound like someone dropping a load of nuts and bolts into the exhaust?Like a mettallic loud rattle? If so it to me would still be det.
Regards
Carl

[royston1xx]

Sorry, i missed that bit. Does it happen around 5500-6500rpm and feel a bit like the rev limiter?

[royston1xx]

Sorry, i missed that bit. Does it happen around 5500-6500rpm and feel a bit like the rev limiter? As that is where my car used to do it.

[michaelb]

it has only happened twice in the last 8 weeks not all the time...it does feel like a limiter but it is not...
Regards,
Michaelb

Sorry, i missed that bit. Does it happen around 5500-6500rpm and feel a bit like the rev limiter?

[Carl]

Royston could be right about the problem then.
I do think that you should either stop doing 150 mph,or get it tuned with a power FC!
Regards
Carl