58villager
Newbie
where did you find adapter fittings and is there a part #
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Dude,you were looking for love in all the wrong places. TunerPro RT is basically free,my prom reader/burner was $40 brand new off evilbay and the 27SF512 EEPROMS were $14 each so $28 in those and the cable to link my ECM to my laptop was $60. A year ago I was dumb as a box of rocks where EFI is concerned and have yet to install the chip that I burned for the ECM upgrade. Some because of the intimidation factor but mostly just because I haven't pulled a round tuit out yet.I looked into doing my own tuning. It was going to be $400+ for all the stuff to burn my own chips, the chips themselves, software, etc.
The price has gone crazy since I bought mine for $5/ea IIRC. On the older 1227747, I got an ECM with a 28 pin ZIF (Zero Inserting Force) soldered in (from Dave w at Old School EFI for $135) so I can easily swap the chips. Originally, that generation ECM had a 24 pin chip. This setup is low enough to screw the cover back onthe 27SF512 EEPROMS were $14 each so $28 in those.
As you know I bought a 7427 ECM just so I could use the 28 pin EEPROMS without having to do the 28 pin upgrade on the 7747. Boosted NW is now selling that Cobra RT emulator that works in the 7427 and if I buy that I'm still in under $400 for the electronic components.The price has gone crazy since I bought mine for $5/ea IIRC. On the older 1227747, I got an ECM with a 28 pin ZIF (Zero Inserting Force) soldered in (from Dave w at Old School EFI for $135) so I can easily swap the chips. Originally, that generation ECM had a 24 pin chip. This setup is low enough to screw the cover back on
This socket has a quick release lever too, takes seconds to swap one out.
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I was also going to have to bore out the TB, crank the fuel pressure, swap in bigger injectors, etc. Keep in mind I'm running a significantly bigger cam and Vortec heads. I already had the squarebore Vortec manifold on hand and I was going to have to run a TBI adapter on a spreadbore to squarebore adapter. The Sniper just made more sense for me, but I know it's not for everyone.Dude,you were looking for love in all the wrong places.
Yeah,I'm doing the same thing. Edelbrok air gap,cam,ported and port matched heads 9.2:1 CR. That intake currently has a Q-jet sitting on it. I bought a complete 454 TB that came with the 81lb injectors and a GM spreadbore adapter for $200. Bushed the throttle shaft for $8 still have to get the overhaul kit that's going to set me back $45. Now with the TB and refurb parts for it plus the electronic goodies that puts me in at over $400 but still half of the cost of a rebuilt Sniper and it is a direct bolt on system with no needed extras or crap parts. The only thing that would piss me off would be the Q-jet and HEI outperforms the EFI. If that happens y'all are gonna see some EFI goodies up for sale.I was also going to have to bore out the TB, crank the fuel pressure, swap in bigger injectors, etc. Keep in mind I'm running a significantly bigger cam and Vortec heads. I already had the squarebore Vortec manifold on hand and I was going to have to run a TBI adapter on a spreadbore to squarebore adapter. The Sniper just made more sense for me, but I know it's not for everyone.
Are you planning to do a lab acceleration test or dyno to compare the two. The air fuel ratios of a well tuned carb would shock most EFI fanboys.Yeah,I'm doing the same thing. Edelbrok air gap,cam,ported and port matched heads 9.2:1 CR. That intake currently has a Q-jet sitting on it. I bought a complete 454 TB that came with the 81lb injectors and a GM spreadbore adapter for $200. Bushed the throttle shaft for $8 still have to get the overhaul kit that's going to set me back $45. Now with the TB and refurb parts for it plus the electronic goodies that puts me in at over $400 but still half of the cost of a rebuilt Sniper and it is a direct bolt on system with no needed extras or crap parts. The only thing that would piss me off would be the Q-jet and HEI outperforms the EFI. If that happens y'all are gonna see some EFI goodies up for sale.