'76 Dart Lite -- Budget Boost Build
And now, to answer questions that I have overlooked.
That will be sweet. I'd go wIth a bigger turbo did I were you. Something in the 60 mm range
For now, I am going to stick with what I have. If it all proves to work, I might do a 2nd version on a spare slant 6 I have lying around.
You might want to enclose the carburetor in a box to minimize pressurization modifications.
Will the stock float stand up to boost?
Is the Dart Lite distributor compatible with running boost, the advance curve is very different from a "normal" slant.
The BOV could be as simple as a low pressure radiator cap (6 PSI) plumbed into the tubing.
Just a few thoughts from someone else that has considered such a thing.
Good stuff. I plan on lower boost, 6 sounds like a decent number. I am still researching carb's abilities. A secondary option, is using a pulse width modulator, to raise and lower voltage, on an alky / gas injection system. We are toying with using this and a MAP sensor, to trigger a nozzle injection setup above carb, to add the additional fuel under boost. The low cost idea, is a washer fluid pump setup, that injects just before the impeller. While this would be far from ideal, I can't imagine it being any worse in terms of distribution then the woeful stock intake, woeful stock head, woeful stock compression, etc
I did not see anywhere how much psi you plan on running, I assume since it is on a budget maybe 6 pounds? I think if your running around 6 pounds you can get away without a BOV.
Not sure what you could do about timing. maybe weld up the advance slots to limit the advance? I know they have things to retard timing when boost comes on but this is a budget build.:finga:
I can't wait to see how this turns out.
What are you planning to do for fuel and timing?
I don't know how the Dart Lite distributor will come into play, if at all, yet. This may not have the stock distributor? The car started and ran, so I never got crazy into the distributors vacuum advance canister, etc.
Hey Backtobasics, awesome thread. All of a sudden /6's don't sound so bad after all. Just my 2 cents on the downpipe-2.5 inches may be a little too small, especially if you're gonna have a crush-bend exhaust made for the car. In my experience with imports, turbo engines don't like back pressure and the bigger/shorter exhausts work best. Just to give you an idea, I run a 2.5 inch exhaust on my all motor civic and my buddy has an rb20det in his 240sx with a 3 inch downpipe, 3 inch mandrel bent pipe going into a dynomax bullet and dumping right before the rear axle. Just my 2 cents. Keep up the great work!!!
Good info. I built the down pipe to 2.5 for ease of connecting to existing exhaust, but it wouldn't be too hard to open up to 3 inches. The stock manifold opening is so small, I am not sure it will make a huge difference either way. The way I see it, the little exhaust opening coupled with the small turbo housing are probably going to be the limitations on the horsepower of this build.
