May need a chip burned for 87 LO3 with 14097395 cam

[studboltgkw]

dave w,
How difficult is it to tune a chip from scratch? I know a number of people on this blog hasn't had good luck with Harris Performance, Inc (tbichips.com) . . . there are other companies . . . Sinister Performance, LLC (gmtuners.com), Fastchip, etc.? Any recommendations?

I sure appreciate you help.

[dave w]

I tune my own chips, so I can't comment on other tuning companies.

Basically, tuning from scratch is not difficult if you have a good timing table from the get go. Most tuner use knock counts to adjust spark advance. My own personal experience has shown me that sometimes adding spark advance reduces spark knock. Adjusting the timing table is mostly trial and error. Adjusting the fuel table is more of a science using the Block Learn Multiplier (BLM) to correct fueling. BLM numbers above 128 are lean, and BLM number below 128 are rich.

When possible, I tune using a Wide Band Oxygen Sensor (WBO2). See attached screen shot of tuning with actual Air Fuel Ratios (AFR's). The only way to adjust Power Enrichment (PE) is with a WBO2.

dave w