Ok, I am slowly learning how to do all this stuff. The only thing I can't figure out on my latest venture to modify my chip is how in the hell do you add spark past 4800 rpm on the ARAP.bin? I am using the most recent .ecu file there is, well as far as I know.

In the last 4 datalogs I have, I pick up knock at about 1800-3400 rpm in 1st gear ONLY. 2nd and 3rd gear I get 0 knock counts. I have been reading the tuning articles and read that I should add spark until I start picking up knock. (And I obviously should subtract where I get knock) Well, how do I add spark past 4800 using the WINBIN editor??

 

4800 RPM is where the spark tables end in the ARAP bin. After 4800 RPM the computer uses the values in the 4800 RPM section.

 

So basically you are telling me that from 4800-6000RPM the ECM dictates, for example, at an LV8 of 200, lets say 41* of advance?

If so.... this creates a huge friggin problem. I can only tune to 4800 and after that RPM I am basically screwed? I get no knock from @ 3400 up.

 

From 4800-6000 RPM the ECM uses the value in the 4800 RPM position on the spark advance table. Another option would be to switch to a speed density ECM. When using the 730 ECM with an $8d calibration you can tune spark advance up to 5600 RPMs. I also like speed density because it is a lot easier to tune.

 

Uhhh..... So basically, no matter what, it is impossible to tune a car above 4800 with MAF and 5600 with SD?

There is somthing awry here. I don't like the thought of this at all. I didn't really think about this until recently, after working on part throttle and idle stuff.

 

it's not that big of a deal for a naturally aspirated street motor...the motors timing requirements aren't going to suddenly change above 4800 are they?

now granted you might lose a HP or two because you can't tweak that last half a degree more (or half a degree less) at some RPM above that to make the curve absolutely perfect, but when you think about it in a different way (it's an entire fuel injection computer you can get out of any junkyard for $50), you are getting WAY more than you pay for.

besides. there's people in the 12's and faster with them and turning RPM well into the 5's or even low 6's, so it's not a big deal.