Quote:
Originally Posted by Gary Smith
Timing and fuel. Other than that air/fuel ratio can be adjusted through "RPM band", graph or whatever you want to call it. Last I checked O2 sensors are being used on "old school" stockers and can be adjusted too. The main difference is splitting apart carburetors and the use of a timing light vs a simple keystroke.
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We've used EFI with old school Hemi's, wedges and the lastest Gen III Hemi. O2 sensors located in the collectors only give you an average a/f reading per bank. Just an example. Lets say If you have one cylinder running lean at 13.2 and one running fat at 11.8 and the other two between 12.3 and 12.7 your a/f reading will read 12.5. With EFI you can adjust timing and fuel per cylinder.
Once we took a 605 EFI Hemi to the dyno. The carb intake was modified for the fuel injectors. We seen that the #8 was running fat so we pulled 10% fuel from that cylinder and picked up 20hp. The #1 and #7 were running lean so fuel was added to those cylinders and picked up another 20.
We run both an old school carbed Hemi and a new EFI Gen III Hemi at the track. With the 64 we're in there reading plugs, changing jets, setting the timing and getting dirty between rounds. I love the hands on except when we're called to the staging lanes and we're still putting the carbs back together and I'm sure that we've all been there at one time or another.
With our 05 EFI Hemi, we can scale the injectors, tweak the timing, adjust a/f's, adjust the rev limiter, change the shift points in between rounds and not get our hands dirty.