Powerloss & Pinging :(

[MSPEC]

Okay about six months ago before I used the wrong fuel and detonated my engine I was making 223rwkws (the engine had just been rebuilt, don’t just 8000ks). Since then the engine has been repaired again replacing two pistons and all the rings. After running it in I changed the oil and headed down to Race Pace with Mobil 8000 in the car. After Ben made the necessary adjustments the car put out just 203rwkws. Ben played around for quite some time and couldn’t get the car to match its previous 223rwkw run. The 20rwkw loss is unexplainable since nothing in the car has really changed.

The performance loss is not really the issue though. For some reason the engine was pinging on the dyno, Ben fixed this but whenever I boot it now the “Check” light goes off flashing. Basically the car is still ever so slightly pinging Any ideas on why the car might be making less power and why a well turned engine with good fuel oil and so on would be pinging?

[Steve]

well, there are alot of different things that can cause detonation and powerloss.

BOV leaking or leak in one of the intercooler pipes and vacuum lines is the first place I would be looking.

Then you could check the injectors are flowing ok, if you have an adjustable fuel pressure reg, is the pressure the right - its easy for someone to accidentally fark with shit when its sitting on a work bench.

A couple of places that may be worth looking at anyways - alot of stuff can happen to an engine when it is pulled apart.

[Duncan]

how about fuel pump?

[MSPEC]

Thanx guys, I think Ben would notice things like fuel pump on the dyno mate. I dont have a bov so that eliminates that ... cool pipes are all okay and the dyno graph shows no loss of boost at all ;(

[benjiman74]

didn't ben have his dyno recalibrated two weeks ago? you may be making the same power but the dyno is reading different. What did ben say?

[MSPEC]

He said "your car is a shit heap now" Dont think that is it, the powerloss aint a big deal why does the engine ping?

[unwritten law]

Do you have a comparison to the AFRs??

[MSPEC]

Thanx for the time guys, took it to Ben today and he fixed it ... think it was mostly a dodgy knock sensor. Anyway, the car runs better and safer now. Cant really tell you what he did, just used some of that magic of his!

[DentonR33]

Sweet whats she making now!! ??

[MSPEC]

It dont matter you will still be in my mirrors tomorrow

[DentonR33]

217rwkw sick re