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Originally Posted by blowin 4  i have ran 11.5 just feels like im loosing power my plugs are copper i like them but yr seem a bit better. im car hugs so much gas if im on it hard i get about 10miles to the gallon and it pulls like crazy and it also pulls to the left a little i think my trial arm bushing is going out i got the new one but never came around to install i hear its a pain in the buttt. |
Do you know your total timing "all in" under boost? Just a few degrees will cause this loss in power and make you think you need to lean it out for more power. Once you get the timing perfect AFR will not make a big difference from 10.7-11.5. Only a few degrees advance will make a 50hp difference on our motors due to the crank stroke causing piston dwell at TDC to hang longer. Timing is a big factor on the MM 2.1L. When changing timing only do 1 degree advance in the map out of Lambda with your AFR at 11.0 and see what happens. After you see the difference from the timing changes then take your AFR to 11.3.
You should like this
I log knock sensors. If you are logging them you can really tune this car in. You will see knock come on and can check AFR and see if it was caused by timing or AFR. This is how Barrie got my car tuned so nicely. If you are logging Knock, RPM, MAF and AFR send my your logs and I can tell you exactly where and what needs to be done to make your tune perfect.