'80 Corvette 350 4 spd M/T, '93 TBI, '94 454 TB, 7427 PCM

[rdicarlo]

Hi All,

Long time lurker, first time poster.

I've had my "project" '80 vette for almost 20 years, since I was 19. Here's what's in it now:

Block GM 3970010
Heads GM 462624 on it now; Edelbrock Performer RPM 64cc 608919 will go on soon
Cam/Lifters Crane Cam/Lifter kit 100172 (I'm not sure why I put in a circle track cam, but it actually idles pretty good)
Intake Manifold Edelbrock 7101
Edelbrock 600 Carb

The carb and intake have been on the car for over 5 years, but they have less than 100 miles on them. Now I want to convert to EFI. I've been tinkering with my '87 vette lately and fell in love with the concept of fuel injection and closed loop engine management. The car's TPI system is finally running good and the car rocks. I used Datamaster and TunerCAT to datalog and burn chips with a Moates AutoProm. Bought a tune from Scott Hansen and he retuned based on my datalog until the car ran good. Good guy. He only does TPIs and it won't fit under my '80 hood. So I'm going to try to install and tune my first TBI system...

So far I've accumulated the following for the TBI conversion but none of it is installed
New '82 Corvette Fuel sending unit (it has provisions for a fuel pump)
New Walbro 255 lph pump
'7427 PCM from a '93 4.3L
Full PCM to engine bay harness from a '93 4.3L
All the sensors and modules on the harness. I think there is some emission stuff on there that I'll strip out when I clean up the harness
'94 454 trottle body with stock injectors. Can I use the stock 454 injectors if I turn down the fuel pressure?
TBI to carb intake adapter plate

I think I'm going to get a new distributor next, but need to do some reading on which one first.

BTW, thanks for posting all this great info on GM EFI systems. It's an interesting hobby that's fun because people like you folks.

Rob

[rdicarlo]

I'll follow the swap with pics in here. Starting on the harness soon, so I'll write it up.
Can someone confirm that I can use a Moates G1 adapter to host a 27SF512 chip in the 16197427 PCM from a 93 4.3L? That's what I do on my '165 TPI ECM.
Thanks

[dud]

I'll follow the swap with pics in here. Starting on the harness soon, so I'll write it up.
Can someone confirm that I can use a Moates G1 adapter to host a 27SF512 chip in the 16197427 PCM from a 93 4.3L? That's what I do on my '165 TPI ECM.
Thanks

Yes. This is the same combination that I use with the "8625" pcm which is essentially the same pcm.
Here is a great resource for all the tuning files you need for the "7427". "http://www.gearhead-efi.com/Fuel-Injection/showthread.php?303-16197427-PCM-Information-0D"

Caution, you may need to get a knock sensor specific to a 93-95 V8 engine. I'm pretty sure I've read here that V6 knock sensors don't work well in a V8.

Good Luck. Look forward to following your write up.

Dud.

[rdicarlo]

Thanks for the reply Dud. I have been doing some research. I see some 16197427 PCM to sensor and TB info for years up to 90 and 94-95. Is there any reason 91-93 is left out? I have pretty much a junkyard pull TBI from a 93 4.3L. I may need a new knock sensor and wire adapter for the 94 454 IAC to 93 IAC 350 wiring. I need to also find a V8 memcal.

[rdicarlo]

I'm going to try to not run a knock sensor. My buddy said the cam will drive it crazy.

Does anyone know if its possible to run the 7427 on a manual transmission 350 without the knock sensor? Sorry, I'm fairly new at this stuff.

Thanks,
Rob

[rdicarlo]

I want to use the MSD Street Fire HEI Distributors 8362 distributor and leave the wires for electronic timing control for future upgrades.
Attachment 10405
If possible, I would like to use the 7427 to lny control the fuel right now. I don't need the auto trans options either because I have a manual transmission.

[rdicarlo]

I'm going to try to not run a knock sensor. My buddy said the cam will drive it crazy.

Does anyone know if its possible to run the 7427 on a manual transmission 350 without the knock sensor? Sorry, I'm fairly new at this stuff.

Thanks,
Rob

Well after much reading, I'm starting to think that it makes the most sense for me to buy a 1227747 ECM and ECM connectors. Just repin my 7427 harness to it. Considering that I'm running a manual transmission and not using the advanced timing features of the 7427, it doesn't make a lot of sense for me to struggle through trying to get the it to work.