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Has anybody tried the painless 4.3 cmfi setup?
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Author:  Alco-slant [ Wed Apr 04, 2007 2:02 pm ]
Post subject:  Has anybody tried the painless 4.3 cmfi setup?
I was looking at options to put EFI in my pickup and i came across painless performance and their 4.3mpi standalone harness. I looked at the manual and i can get the rest of the parts out of the yard. I plan to turbo the truck also(I have a rayjay b25 in my living room) and i know some people have turbo'd the 4.3 vortecs so i dont think thats a problem. I was wondering if anybody here had tried one of the painless setups in their vehicle. I'm leaning towards a megasquirt kit but this vortec thing looks tempting as well. My main concern with adapting the vortec is what do i do with the distributor? any advice is appreciated
Author:  SlantSixDan [ Wed Apr 04, 2007 2:22 pm ]
Post subject:  Re: Has anybody tried the painless 4.3 cmfi setup?
Quote:
I was looking at options to put EFI in my pickup and i came across painless performance
Careful. Painless' stuff has never been especially great (except for some of their stuff specific to GM cars), and they've recently been downgrading the quality of their parts (Chinese no-name relays instead of German, Japanese or American ones, for instance).
Author:  sandy in BC [ Wed Apr 04, 2007 3:34 pm ]
Post subject: 
Painless likely used the GM 7 pin HEI module. You install it like the 4 pin HEI /slant 6 EI swap.

I have wired up a couple of GM EFI factory harnesses. They are high quality and easy to work with. Make sure you have a plan for containing your finished harness(tape/convoluted tubing, stainless blah blah)
Get a $20 solder iron and some good solder. Have a colour print of both vehicle wiring harnesses. Test "extra" wires for voltage before snipping.

I have a Vortec 5.7 TBI in my 1973 work truck. I used factory harness and a good chip burner. The only thing inside the distributor is a 7pin module a pickup and a rotor.

You cant go past about 270/adv duration with a GM setup . ( No really.....you cant)
Working with a turbo and milder cam could get around that.

Solid lifters render knock sensors psychotic.
Author:  Charrlie_S [ Wed Apr 04, 2007 7:02 pm ]
Post subject:  Re: Has anybody tried the painless 4.3 cmfi setup?
Quote:
(I have a rayjay b25 in my living room)
Do you know the original application of that turbo? I am using a Rajay on my 170 slant. I have to check the numbers, but it was originally a Corvair unit. The early Corvair used a "B" flow, which is too small for a 170, much less a 225. The later Corvair used a "F" flow which is ok for a 170, but needs a modified compressor housing and a different exhaust housing to get over 10 lbs boost. A "E" flow can go up to about 15-18 lbs, which I do have, but haven't used yet.
Author:  Alco-slant [ Thu Apr 05, 2007 3:01 am ]
Post subject: 
the turbo i have is compareable to a t-25. which is what was reccomended to me for a stock 225 looking for 5-7psi of boost. I'd live to find an e-flow to get more boost, or i geuss i should just get a t3/t4 hybrid. cause those rajays are hard to find
Author:  Charrlie_S [ Thu Apr 05, 2007 4:08 am ]
Post subject: 
As far as I know, the Rajay is not made anymore, and parts are hard to find. It has not been a problem for me, since I have had mine for 30 some years, when they were the easiest/least expensive to get. The "E" flow I have is still new in the box.
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