XRFORDPILOT

Just a quick question does any one know the timming settings for an ef/el V8

!Gn|T|0n

Factory spec is 30° BTDC ± 2°. Most here are happily running at 34° BTDC. Run premium.

XRFORDPILOT

Thanks for the info I ahve passed it onto my mate who was having some problems

Vic

Maybe I could put a problem to you guys.

I have a EL V8 and I've just had some extractors and cats back system put in as well as a larger air intake snorkel. Before they installed these goodies they did a dyno and said they thought that the output was quite low.. about 90kw@rear wheels. They said they believed it was a little low for stock. They then did a dyno after the install and also adjusted the timing for optimum while it was on the dyno but still felt that it was still down on power - maybe 120kw@rear wheels instead of higher. The dyno was telling them that the air mixture was not right, that the MAF sensor was mixing more air into the mixture than it was supposed too and that the engine was running too lean.
I remembered that in the last two months since purchase, I'd had pinging problems. I know that being too lean can make the engine ping. The guys disconnected the sensor and did some more dyno tests and concluded that the MAF sensor was failing.
They didn't have the diagnostic equipment to connect to the engine computer so tonight I took it to another garage that I have used regularly in the past because they had the diagnostic equipment to plug into my engine computer and they found that the MAF sensor checked out as running fine - no error/failure.
My problem is that a MAF sensor that seems to check out fine is going to cost me about $350 just to play it safe.
My question is: is there another way of checking the MAF physically or testing it in some other way to give me a solid yes or no?

EDXR8

Not that I know of. Do you know what AF ratio is was running at? I guess the easiest way would be to borrow someone elses and change it and see if it improves. THat way you don't waste your money if that isn't the problem. BTW, if it is leaning out at full throttle then it is probably not the MAF, the MAF is only used at partial throttle. It could also be blocked injectors or faulty oxygen sensors.

Vic

When the throttle was wide open on the dyno, the AF was at about 15 and climbing. It should be about 12.5 to maybe 13 at wide open throttle and about 14.7 or so at base idle.
Also, I don't personally know anyone with another similar car that I can swap sensors with.
I am trying to organise a fellow through the performance center to pull my sensor and "scan" it properly next week. At least he should be able to say whether its ok, slightly dodgy etc...

Vic

I have just come back from the performance center where they had a fellow come down with a reco'd MAF sensor. It was installed and the dyno showed the AF ratio to be correct this time and I got another 10 rwkw out of it.
So I have now learned that even though the diagnostic computer that was plugged into the engine computer showed the MAF as working correctly with no errors, it was definetly dodgy and my long running pinging problem is gone.

__________________
Never argue with an idiot. They drag you down to their level, and they beat you with experience.

EDXR8

Yeah the diagnostic computer just probably checked to see if the MAF was returning a voltage withing normal voltage range, but it was obviously not accurate throughout the rev range.

Vic

Yeh and I'm stoked that this two and a half month pinging / fuel economy issue has been sorted. Its been shitting me, knowing that there has to be a reason for the pinging but not having enough knowledge on the workings of the engine and EFI side of things to figure it out.
If it hadn't been for my urge to modify the car a little I would probably not have found a couple of the other little things wrong with it at the same time like the fuel filter being pretty clogged, the drive belt with cracks in numerous areas (visually looked ok until I got it off the pulleys).
Now when I hit the throttle I could almost get a semi at the acceleration... hehe.

__________________
Never argue with an idiot. They drag you down to their level, and they beat you with experience.