MSD Fuel Injection for our V6's?

[TJ's GMC]

To expensive I know, but would it be worth it? If it works for V8's I don't see why it wouldn't work for a V6. Better mileage and smoother performance? I'm almost considering trying it when my 66 is done. Be a neat or not so neat experiment.

https://www.msdperformance.com/products/fuel_systems/atomic_efi/atomic_efi_tbi/parts/2900

[GMJakers13]

Could you not more cheaply adapt the fuel injection from a tbi v6? Ive tossed the idea around. A simple reprogram to the chips from a scrapyard v6..a little more time maybe but I imagine several hundred dollars cheaper

[TJ's GMC]

I'm sure you could. Guys in the past talked about doing it, but man this would be neat!

[ilvracn]

im guessing you would want to use the injectors from a v-8. 305 small block. would be be better to match injector size with cubic inches. i dont no what you would do with the dist, and timing curve.
rick

[TJ's GMC]

im guessing you would want to use the injectors from a v-8. 305 small block. would be be better to match injector size with cubic inches. i dont no what you would do with the dist, and timing curve.
rick

Neat thing about the MSD atomic is that is has the injectors built into the throttle body. No injector ports needed.

[ilvracn]

msd would be the way to go. but $$$$$, 2400.00 with fuel pump, 2100.00 without fuel pump

[TJ's GMC]

That's the problem. haha

[tommr]

GM TBI would be relatively cheap and would improve cold weather performance . also a gear change in the axle or an overdrive trans.

[bigblockv6]

im guessing you would want to use the injectors from a v-8. 305 small block. would be be better to match injector size with cubic inches. i dont no what you would do with the dist, and timing curve.
rick

That's simple, just use an HEI distributor:teehee:

[Charon]

Ok. You all advocate big cfm carbs. 5-600 cfm. Not sure why. The most a 305 can pull before the rod bolts break is 350cfm. So small gm tbi... 430cfm... Engineering says 450. But efficiency goes to crap at 400. My curves say 410. After that nothing is good.just using my brain.....

[Charon]

Btw. Tbi works good. I have done it.

[beerman]

Yeah I don't think these motors have a have a high VE 80% at best probably closer to 75% because of the low compression. That compounded by a low their RPM equals a low CFM requirement

CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456

Using high side of the spectrum looks like this

CID 305
RPM 4000
VE 80%

CFM 282

[Charon]

This is why I don't advocate the holley 500. The stromberg is a much better carb up to 300cfm. Carbking. The national expert on carbs. Has all the efficiency data. All things being equal. Condition. Tune. Engine condition. The stromberg beats any carb up to 3500 rpm. Hands down. The gm tbi. With a 4.3 computer. And the injectors from a 5.0 litre. Using a stock 92-94 harness that has been stripped down. Using a 4.3 dizzy grafted to a v6 base. Works very well.

[Charon]

Spend some time at the international sites. Cornbinders etc. They have whole tech writeups on gm tbi. Very good stuff. From very smart guys. Those guys put tbi on all the old cornbinder engines. That's the place I got all my info from for tbi on jeep 4.2 and 360 v-8 engines. And for my v6 conversion. And all the pinout diagrams are linked. And it's so easy to pull down a harness.especially the standard trans truck ones. I spent the day after Christmas last year building harnesses. I laid them out on the kitchen floor and made them. Tagging all the power and grounds. Plus all sensors. Once you do one it's an hour project.

[Charon]

So here is a 1991 5.7 litre. 4l80e harness and computer from a square body suburban. These are my holy grail harnesses. Easy to pull apart. And I can run a 4l80. I could run a Gmc v6 if I used a 94 4.3 computer with a 4l60 trans. I would need to send off the computer for some work. To run a 4l80 .But I save these for 71-72 trucks that I put 4l80 transmissions in with tbi conversions. Most of the loose wires are. Hot. Hot run. Or hot crank. The whole thing runs about a hundred bucks with all the sensors and throttle plate and dizzy.

[beerman]

Here's a good link
http://www.gearhead-efi.com/gm-ecm-pcm-conversion/tbi-efi-conversion.html

I guess the TBI only needs the distributor pulse no need for a crank reluctor because the injection is not cylinder specific. Also looks to be Speed Density (MAP based) fuels based on engine load.

[Charon]

That's a good link to learn from. Thanks beerman. I first started doing these way back 24 years ago. I am part of an old car club here that was looking into this. I was the youngest. And by default got the honor. At that time there was a local putting 4bt engines in scout 2's really cool crap. Also Carl I can't say his name. Cause I don't want to link him to this site was building crazy strong dana axles and u joints. He puts dana 70 stuff in dana 60 housings. And these were going into the scouts .Well he had ties to the cornbinder crazies here. And so all us 4x4 nuts started talking. And a Nebraska international club was mentioned. They had written an article about gm tbi conversions in a newsletter. So we did the easy swaps on chevy motors. It was wonder full putting these on chevy powered jeeps. So then the internet was coming up and we all started jabbering about all sorts of swaps. Most of what I needed was dizzy related. I could go on for hours about those days. It was fun. Most of those guys have moved on for out of the scene. Carl still builds rearends. His mods actually inspired dana to beef up the d44 that the Rubicon jeeps use. But he is in Snohomish wa now. Now all the guys just want to buy it off the Summit site. Plug and play.

[funkhoss]

I know this is an old thread, but...

I'm considering putting a TBI system on a V6. I see that "Charon" has been banned from this forum, but I'd really like to ask him some questions about the TBI conversion that he did.

Does anyone know how I can get in contact with him?

Thanks!

[FetchMeAPepsi]

I know this is an old thread, but...

I'm considering putting a TBI system on a V6. I see that "Charon" has been banned from this forum, but I'd really like to ask him some questions about the TBI conversion that he did.

Does anyone know how I can get in contact with him?

Thanks!

Barry was a genius when it came to these old trucks. He helped me out of quite a few problems when he was here when others got frustrated and just quit. This was back when I first got into old trucks and didn't know anything at all. His only problem was he just kept fighting with people and admins so I guess they had to let him go.

I can try to pass on a message if you want, assuming the info he gave me still works. It's been a while. PM me and I'll see what I can do.

[funkhoss]

PM sent. Thanks so much for your help!