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  1. Paul_G

    Starting with square carb, tuning for boost.

    I believe that is what killed the Hemi that was in the car. I am tuning as if there was no meth. When the meth comes in it will cool the air charge and add some fuel enrichment. If my AFR goes richer with the meth on it should not be a problem. I am tuning for a safe system, not tuning for max...
  2. Paul_G

    Starting with square carb, tuning for boost.

    A little history, When I got this 69 Road Runner it had a hurt 528 Hemi in it with the an F1 Procharger, and using an antique water meth system. It had a horrible tune on it, too much timing and way to lean. No wonder the Hemi was damaged. Three cylinders scored, broken rings, compression under...
  3. Paul_G

    Tuning for water/meth injection

    My roadrunner with the Procharger will be back together this week. The 528 Hemi that was in the car when I got it wont be back from the machine shop till next year sometime. So I put my mild built 383 in it for now. Plan to start it up with Holley 670 standard carb, no blower. If the trans...
  4. Paul_G

    Tuning for water/meth injection

    I have been doing some research on the use of water meth. Anyone on here familiar with it?
  5. Paul_G

    At what point is a high flow power valve required?

    Low speed cruise bucks a little bit. Running in the high 14's afr. They have drilled plugs in the Transition slot feed hole in the primary metering block, might need to open those a touch.
  6. Paul_G

    At what point is a high flow power valve required?

    I have been getting this new to me carb dialed in on my 505 stroker. Bought the carb used and rebuilt it. The carb is a Holley based custom built 950 by Pro Systems. It had 76 jets in the primary with 7.5 PV, 90 jets in the secondary with a PV plug. MY AFR's were showing mid 14's at half...
  7. Paul_G

    Using a Thermoquad with boost

    Yes they do have nitrophyl floats in them.
  8. Paul_G

    Using a Thermoquad with boost

    Thanks for all the info. I never thought about fuel being pushed out around the accel pump shaft. I have a Holley 900 CFM that is a boost carb. It is on the 528ci Hemi right now with a Procharger. The Procharger makes about 10PSI of boost. The Hemi is coming out for a refresh. I want to put a...
  9. Paul_G

    Using a Thermoquad with boost

    Just curious if carbs other than Holley style will work with boost? Edelbrock or even an old Thermoquad?
  10. Paul_G

    Blow through carb rebuild

    I have given this some thought. A power valve works by manifold vacuum overcoming the spring and closing the valve stopping fuel flow through the valve. The spring on the power valve holds the valve open to allow fuel flow. With the engine running, and as long as the throttle blades are...
  11. Paul_G

    Blow through carb rebuild

    That is a great video series on blow though carbs. It is where I saw the adjustable power valve. Have one on order, should be here this week.
  12. Paul_G

    Blow through carb rebuild

    Does not have a PCV system. Both floats are Nitrophyl.
  13. Paul_G

    Blow through carb rebuild

    Nothing as of yet.
  14. Paul_G

    Blow through carb rebuild

    After the install of the air fuel ratio gauge I found the carb tune was way off. Too rich at idle, mid 11's, to rich at cruise, low 12's, and stupid lean when given the beans, mid to high 15's. How the carb is built is a puzzle. It does not have a Holley list number. Looks to be a custom built...
  15. Paul_G

    Fuel pump sizing

    The fuel pickup in the tank has a 3/8" line on it. They ran 3/8" hard line from there to the fuel pump, after the fuel pump to a Fram canister style fuel filter, and up to the fuel pressure regulator, all 3/8" hard line. Aeromotive said that regulator is the one to use. The 3 to 15psi rating...
  16. Paul_G

    Fuel pump sizing

    Yep! Just got off the phone with Procharger. As I was explaining the build and the symptom he stopped me short and said the fuel system on the car right now is not going to work with the build. He suggested I call Aeromotive and have them spec a system. Which I am going to do right now.
  17. Paul_G

    Fuel pump sizing

    No waste gate, it is a belt driven Procharger
  18. Paul_G

    Fuel pump sizing

    I found a spec sheet for the F1 Pro Charger. It is capable of Max boost of 38 psi. I would assume that is dependent on pulley sizing. That being the case, the fuel system needs to make at least 45 psi max fuel pressure to keep pushing fuel against the boost pressure. Right or wrong?
  19. Paul_G

    Fuel pump sizing

    Installed both the fuel pressure gauge and the boost gauge. The fuel pressure regulator is a newer looking Aeromotive. No id on it but looks exactly like this one. Pressure Range (psi): 3-15 psi https://www.summitracing.com/parts/aei-13204 Took the car around the block. Normal neighborhood...
  20. Paul_G

    Fuel pump sizing

    Now that is a problem. I bought the car from a dealer, he bought it from another dealer. I have no information at all about the build. A retired PD friend is trying to see if he might be able to get some history on the cars previous owners.
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