Funny, the only auto/truck forum I've joined on the internet is this one,FWIW I have both the Doug Roe and Cliff Ruggles book. I have been sucessfully building Q-Jets for more than 20 years myself. I have the Thorxen tool set for the CCC ones too. I once had a source for chips to reprogram the CCC computers, but they have long dried up.
and given that the GMT400s did not come from the factory with a carb (?)
I didn't figure that I'd end up rubbing keyboards with some fellow Q-Jet tuners.
Here we are in 2023, and I feel like I have finally found my peoples! :0)
Good stuff. FWIW I've done a little EFI tuning a long time ago (TwEECer,
dialing in a 331ci 5.0/5-spd 'stang with a cam, GT40 intake & heads,
intercooled Procharger set up for ~14 lbs of boost, Snow water/methanol
injector indexed off the Litening MAF, 19lb>60lb injector upgrade,
added a knock sensor from a F150 while at the machinist, forged flat top
pistons, blah blah blah.) We put this together with high hopes...
Once we got it moving under it's own power, well after maybe 30 minutes we
had the full-throttle A/F ratios where we wanted them. SO much easier than
iteratively changing out brass bits in the carb!
And after 2-3 full days of test/tune/change parameters/save/loop on error ad
naseum...we finally got the part throttle calibration where the car drove as
nice, clean, & responsive (closed loop) as when it came off the showroom floor.
Had to translate all my old carb terminology to a new EFI lexicon (accelerator pump
became plenum volume, etc.) But man oh man, I was the oldster working
on this, and I think I appreciated what a tunable EFI setup allows you to do
more than anyone else on the team.
Here's a youtube video by the owner, who I was mentoring on F-16s
during the day, and we continued the fun after hours spending his
money on something he really wanted to learn. (Caution: This video
was done back in '07, video technology has come a long way since
then. (Skip to 0:45 to get to the twEECer stuff.)
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After it was all said and done, what previously felt like a whale of a
convertible now felt like an ultralight. The push in the seat at
full boost was most gratifying. It was just plain stoopid. :0)
(many years pass)
So, now I'm watching you guys dialing in your bowtie EFI systems, and
although I'm a huge old-school Q-Jet fanboy, I am also looking forward to
adding EFI tuning on GMT400-style vehicles to my repertoire.
What can I say? This stuff *never* gets old. You guys rock!
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