Pinking under boost with just 9 degrees of advance
Discussion
I have been running my mk2 Golf on 99RON fuel since the engine conversion but now fuel costs a small fortune I have switched to 95RON. Ignition advance is 9 deg around 3000 rpm at 180kpa, above and below this area I can run a lot more ignition - its like I have a 'hole' in my map in this area. The car runs fine with this amount of advance (although I'm going to have to take more ignition out to cope with 95). I have been considering swapping to a colder spark plug but even the high output versions of my engine (VAG 1.8T) use the same heat range. I have verified my base timing.
So do I just run with such a small amount of ignition, try colder plugs or something else entirely?
So do I just run with such a small amount of ignition, try colder plugs or something else entirely?
What about engine temps? Can you run it at say 80*C. Normal engines seem to be around 98*C
That might also help.
There is a couple of good articles here on running high combustion pressures.
http://www.popularhotrodding.com/enginemasters/art...
http://www.popularhotrodding.com/tech/0605phr_pump...
Sainsbury's also sell 97 octane not much more than the 95 stuff. I know 99 is way expensive. Perhaps you should try something in the middle to help as well.
Made a big difference for me, I was running 11.2:1 NA.
That might also help.
There is a couple of good articles here on running high combustion pressures.
http://www.popularhotrodding.com/enginemasters/art...
http://www.popularhotrodding.com/tech/0605phr_pump...
Sainsbury's also sell 97 octane not much more than the 95 stuff. I know 99 is way expensive. Perhaps you should try something in the middle to help as well.
Made a big difference for me, I was running 11.2:1 NA.
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