Awesome ride!
When I think of the EFI thing I think of this poster that I keep on the wall at work
Your hole is efficient fuel delivery. Fitech or Holley sniper is the easy button. No need to learn EFI theory to use these products.
Pete
Awesome ride!
When I think of the EFI thing I think of this poster that I keep on the wall at work
Your hole is efficient fuel delivery. Fitech or Holley sniper is the easy button. No need to learn EFI theory to use these products.
Pete
NOHOME said:Awesome ride!
When I think of the EFI thing I think of this poster that I keep on the wall at work
Your hole is efficient fuel delivery. Fitech or Holley sniper is the easy button. No need to learn EFI theory to use these products.
Pete
But the cost of the drill bit to make the whole does matter. I've succesfully megaquirted a car before, so I'm not completely out of my element.
californiamilleghia said:Any pictures of one of those GMC motorhomes converted into a race car hauler ?
just wondering if there is a cool way to do the back doors / ramps
Is your race car tiny?
If you need open deck, this could be inspiration:
Why bother even talking about a 454? Unless you're going to modify it then it's not going to be enough better than any other stock 450-anything to be worth the trouble.
A friend of mine did a MS conversion on a 455 Pontiac a few years back, it ran well but was a lot of work - you have to add injectors to the intake manifold, modify the gas tank, run new fuel lines, etc.
I think multiport setup is also sort of pointless for a stock super slow vehicle that just needs to run and be reliable.
Stock TBI setups are simple and reliable. Let the ignition be covered by a 1-wire HEI distrib and it's literally as simple as fuel injection can be. He already has an MS, so once you get a stock Chevy TBI and pigtails going to it, all you need is an inline electric fuel pump, about 3-4 wires going to the MS box for batt, ign, fuel pump out, ground, and about 8-10 wires going from the MS to the engine bay for HEI, TPS, MAP, injectors, and wideband. Done!
Vigo said:I think multiport setup is also sort of pointless for a stock super slow vehicle that just needs to run and be reliable.
Stock TBI setups are simple and reliable. Let the ignition be covered by a 1-wire HEI distrib and it's literally as simple as fuel injection can be. He already has an MS, so once you get a stock Chevy TBI and pigtails going to it, all you need is an inline electric fuel pump, about 3-4 wires going to the MS box for batt, ign, fuel pump out, ground, and about 8-10 wires going from the MS to the engine bay for HEI, TPS, MAP, injectors, and wideband. THE END!
are there any websites / blogs /forums that show using the TBI injection on an earlier non-injection car
Just wondering if its that easy to get it working on something odd like a Borgward ?
I'm sure they are out there but TBI retrofits onto older engines are rare because of (i assume) the general rarity of people willing to do wiring work. And then one level of difficulty up from that is being able to understand how the things you are wiring actually work.
But, on that subject of how things work, throttle body injection is by far the simplest type of electronic fuel injection because it has minimal hardware (for example on the GM setup even the fuel pressure regulator and MAP sensor are built right into the throttle body).
I think it's ideal in this specific scenario because Matt already has an MS box, knows how to work with it, and the GM tbi setup is appropriate for the level of performance he needs to get out of a motorhome. Combine those factors and it's more attractive in my opinion then buying an off-the-shelf aftermarket TBI system.
Vigo for President!
AngryCorvair said:Vigo for President!
I second that!
I would be tempted to diesel that beast.
The 454 TBi has an adapter plate that bolts to a Q-jet manifold.
It doesn't get much easier than that.
In reply to mad_machine :
Unfortunately the diesel that bolts to that transaxle is a pile of crap. I don’t know how easy any others are to adapt.
Well, circumstance made it an easy decision....
That was easy.
Now you need to force-feed it. 
I haven't seen an autonomics system in YEARS
Good score. These are getting pricey. They’re almost like 911’s. At first only the faithful were interested. Now almost everybody wants in.
I have one of those airsensors systems in a box myself. The throttle body is cool, and as low profile as you can get.
In reply to m4ff3w : embrace the carb. There are plenty of places that rebuild them properly and that will be a lot cheaper and easier than the alternatives you’ve listed.
On the vehicle there won’t be much difference in fuel mileage or power. 12,000 pounds will extract its own penalties and without the development and sorting the risk of going too lean will destroy that old engine. In fact going too rich will also damage it.
The factory spent thousands of man hours sorting out fuel injection to comply with all the various different conditions. Proper location of sensors, different fuel system choices, etc.
On a light daily driver the process is far more straight foreword then on a 12,000 pound vehicle.
I used to sell GMC motorhomes with the Oldsmobile 455. It would average 10 mpg at 60 mph. If you really focused you might improve that by a Mile per gallon or maybe a tiny fraction more. But it was just as easy to drop 2 or 3 mpg
The best way was to mount a vacuum gauge in line of sight and learn to keep it towards the top.
Learn to carry a fuel stabilizer with you and the last thing you do on the way home is dump it in the gas tank a few miles from home. That will give it time to mix and enter the carburetor.
I do that on my boat and even though I’ve laid it up sometimes for years with a fresh battery charge the boat fired right up and runs as good as ever.
Before you worry about getting it to start focus on making it stop. Brake system on these sucks, and bleeding the rear cylinders is a real blast. EFI will help with the vapor lock issue, but a well tuned carb gives about the same performance and economy. Go to applied gmc, they have the best products and advice. Also, the facebook groups are a big help. The support network on these is awesome, but be prepared for a lot of time and money to get it running well. Gave up on mine this year, terminal frame rot. Currently sawzalled the crap out of it, selling all the mechanical bits. Got a great running 455 with headers....
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