I'm having trouble finding an ARAP 305 bin. I tried a 350 ARAP bin file and have the WOT getting pretty good, changed injector constants to 19#, and made a few changes to lock up the converter sooner. WOT feels good, but my mileage is down to 135 miles per tank!!! I got almost double that on the stock bin I modified... I think I'd be closer if I could start with a 305 ARAP file from the get-go. Thanks guys!

2 points:

1) you can't tune your PROM via monitoring gas mileage. If your gas mileage is way off just from changing the chip, then something is very wrong and i would not be leaving it in for another mile, let alone tankful unless i had a scantool on it.

2) step back and consider what the 4 letter code ARAP stands for. As soon as you figure that out you'll know it's so hard to find a 305 ARAP.

1. Scan tool parts are in the works.

2. Is there a list of what the bin letters stand for? A code to determin the name for myself would be cool. I asked for an 89 305 TPI bin and everyone pointed me towards the ARAP... What's the proper 305 bin?