MSefi.com read only forum (Jan.15,2018)

i am new to the efi world mainly do a alot of carbs but really cant afford the gas mileage i need to go to efi so i need alittle help i want to switch my sbc 350 carb over to efi what system would be the best to swap it over and still use HEI

There are any number of possibilities for a SBC. My first MS project was a TPI setup with HEI using MSII v3.0 and B&G code on my 79 Corvette. Before I moved on to my current project (in my signature) I was getting 26 mpg.

I have a couple of pics of my TPI project at : http://www.kandlservices.com/tpi

Good luck!

Ken

26 mpg you say what were you running for gears in the rear and what trans

also can i use any HEI i want

sweet85chevy wrote:also can i use any HEI i want

Pretty much. With a 4 pin HEI module, the distributor advance mechanism would control timing; with a 7 or 8 pin HEI, the MS2 will have no problem controlling timing. We have a series of articles on converting a 350 from carbs to EFI - first with just a TBI swap, then with a TBI and ignition control, and finally stepping up to multi-port using a Stealth Ram.

http://www.DIYAutoTune.com/tech_article ... 1-nova.htm

sweet85chevy wrote:26 mpg you say what were you running for gears in the rear and what trans

That was with a 3.55:1 rear end and TH700R4 transmission (.7:1overdrive)

Ken

Matt Cramer wrote:

sweet85chevy wrote:also can i use any HEI i want

Pretty much. With a 4 pin HEI module, the distributor advance mechanism would control timing; with a 7 or 8 pin HEI, the MS2 will have no problem controlling timing. We have a series of articles on converting a 350 from carbs to EFI - first with just a TBI swap, then with a TBI and ignition control, and finally stepping up to multi-port using a Stealth Ram.

http://www.DIYAutoTune.com/tech_article ... 1-nova.htm

this helps thanks so do i have to get the relay board

The relay board is optional, although it makes wiring a bit easier. We often use it when wiring up a car not originally wired for EFI, but you can also use a conventional fuse block or find some sort of relay module in a junkyard. Your call.

ok thanks this helps alot

Im in the middle of swapping my 85 Jimmy over to Tbi injection controlled by Megasquirt here is the link to my build thread.
http://www.v8s10.org/forum/viewtopic.php?f=24&t=29063

do you have to use the stimulator

sweet85chevy wrote:do you have to use the stimulator

IMHO many faults are in the loom. Either actual wiring or connections. The stim can eliminate the MS as being the problem. I found a breakout box even more useful - allows you to actually check loom wiring easily. Or use a DB37 connector with tails for this as a cheaper option.

can i take a 4 pin HEI dizzy and put a different 7 pin module

sweet85chevy wrote:can i take a 4 pin HEI dizzy and put a different 7 pin module

As long as you lock out the advance mechanism. Where I live, you can find oodles of 7 pin distributors for $20 each at the you-pull-it junkyards - look for TBI pickups and vans.

I have 2 of the 7 pin variants around the house and would be willing to let one go. I went edis instead.

sweet85chevy wrote:can i take a 4 pin HEI dizzy and put a different 7 pin module

Yes, I did for a traditional Pontiac engine where there are no EFI traditional Pontiac engines. How ever there are EFI versions of the sbc. visit a local Pick a part yard and look for an EFI version of a sbc engine.

8974Ollie wrote:

sweet85chevy wrote:can i take a 4 pin HEI dizzy and put a different 7 pin module

Yes, I did for a traditional Pontiac engine where there are no EFI traditional Pontiac engines. How ever there are EFI versions of the sbc. visit a local Pick a part yard and look for an EFI version of a sbc engine.

so i cant use the ones with the coil on top i have to use the tbi one

sweet85chevy wrote: so i cant use the ones with the coil on top i have to use the tbi one

You can also use the TPI version, which does have a coil-in-cap setup.

Matt Cramer wrote:

sweet85chevy wrote: so i cant use the ones with the coil on top i have to use the tbi one

You can also use the TPI version, which does have a coil-in-cap setup.

ok thanks