GM Crossfire build

[Kane]

Hi- this is an INCREDIBLE site!!! Y'all have a lot of great information here and I am very happy I found these message boards!

I have a 1982 Corvette that has been in my family since the 80s. My dad was the second or maybe third owner and I have had it for almost two years. My intent is to keep the car as stock looking as possible- so that means keeping the OE airbox, twin TBIs, etc.


I recently put a crate motor into it and have been working on getting the tune where I want it. Seems to be running really well- although I still think I have some fine tuning with some of the tables.

Here is what I have:

Engine:

• Cast iron pre '86 passenger car perimeter bolt heads
• Hypereutectic pistons
• 9:1 compression
• .465"in / .488"ex - duration @.50 224in x 234ex
• 36 degrees total timing advance

Air / Fuel delivery & Engine Management:

• 80lb injectors
• Renegade Intake (full sized intake port aftermarket crossfire specific manifold)
• 15psi adjustable regulator
• Stock TBI units- balanced (removed the anti-tamper plug & weld)
• EBL Flash
• TT01 WB (coming soon, but not installed yet)

This has been a really education for me- that's for sure!

Some things have been trial and error. For example, I tried running a spark table originally for a TBI truck to get the tuning started since the heads are not aluminum, swirl port, Vortec, or other that seems to have a lot of SA maps floating around the web. Needless to say, a truck SA table wasn't a good match- so I found an older table from another project. My current SA table (in the attached file) is based upon an iron head, TPI motor with an L82 cam and 1.6 rockers I had about six years ago.

So here is my first question- does this SA table seem to be a good match? It seems to run very well from idle through 5k rpm with no knock at any rpm or kpa. The timing pulls into the ball park of maximum advance at WOT starting at 2200 (well, 33 degrees at WOT including PE at the upper kpas) and holds at almost 30 degrees (before PE) from 3200-4800.

And my second question... I'd like any thoughts or suggestions y'all might have about the tune otherwise.


Thanks in advance!