I will shortly be swapping my TPI 305 for a stealthram 355 and obviously going to be needing a new tune. Coincidentaly to my delight I found that Holly EFI has already designed a tune for thier commander 950 software with a motor combination very close to what I am building. Same cam, injectors, cubic inches, etc. The only difference mechanically is they are using thier own 20 degree heads and I am using Sportsman II's.

I purchased last year an autoprom from craig moates and some misc. chip burning and emulating pieces. all in all cost me roughly $500. Unfortunatly I still have very little idea on how to effectively decipher my data and tune on my own. I was wondering since my engine was similar if I could borrow Holly's numbers and just burn a chip and plug it in. I think it would be a great place to start and might hopefully eliminate a lot of trial and error. What do you guys think? What's first?

Here are some details:

Mpi3008 Base Map For 355 small block Chevy, 30 lb/hr injectors, StealthRam intake, 58mm throttle body, 20 degree Holley heads, Lunati 30142 cam (235/245 @ .050, .507/.534, 112 LC), 9.5:1 compression, 43 PSI fuel pressure, 418 HP @ 5500 RPM, 422 ft/lbs @ 4700 RPM.

Me- 350 4-bolt .040 over
forged flat-tops w/ 4 valve reliefs
stock crank
World Sportman II heads
62cc chambers
30lb/hr injectors
Lunati hyd. flat tap cam 30142
165 ECM and MAF

 

Do I need the commander software to even make this translation possible?

 

Holley ECM is not going to have all the other tables and qualafers and adders of stock ecm, so I doubt there one table would be correct. If you could open their maps you could get an idea or percent changed to use, spark too. Still just a start.

You got all you need to tune, learn it! Not hard, some math invlolved, TunerPro does most, exel spreadsheets do it too.

Very rewarding and also addicting! We are starting a 12 step program to help those afflicted!

 

Thanks for the vote of confidence. I just can't wait to get it driving really good. I know I can pick it up once I do it a few times. It just seems like that might take a while to be at even an intermediate level. I would rather have a chip burned for me to start and then dial in the last 15% on my own so to speak. Ya, I know its the easy way but I'd rather be driving honestly. I am looking forward to the day though when I'm on the inside looking out as opposed to the outside looking in when it comes to tuning.