Low Torque ! Missing Exhaust Manifold Bolt + Leek

[SkylineR33]

Hi People, I have had a missing bolt on my Exhaust Manifold since I brought my car 1 year ago and this winter it has started leeking, only for the first half mile then it seals itself but could this be part of the reason by last Dyno reading showed a big drop in torque ?
I am going to book the car into RSP nxt month to get this sorted, is there anything else I need to get them to look at aswell ?

 

[pgarner]

yeah if the exhaust gases are leaking out before the turbo(s) then they will take longer to spool

 

[SkylineR33]

Even if the leek seels itself after the first half mile will it still be causing problems at high speed on the torque side of things ? + could this also be a reason why I get a nasty smell in the car after a blast ?

 

[obi_waynne]

This sort of thing messes with the lambda and the ECU is always trying to adjust itself. I don't know abou the R33 but most cars use a trim for the fuelling based on an average over the last few hundred miles.

I doubt it ever properly seals itself. It would be worth getting the head off and doing some porting and polishing at the same time.