Too Slow/Q-Jet question

[Mike Pearson]

Originally Posted by Adger Smith

I'm not a real Q-Jet tuner, but I question the 6.5 lb fuel pressure.
N/S area vs the small float
What do the experts say about that?
I have had Q-Jet customers that are very particular about regulator location and fuel line routing to the carb...
OK What you say Q-Jet experts??

6-6.5 PSI is what I run for fuel pressure. You need minimum 1 gallon of fuel delivery at the carb in less than 30 seconds. I run a Magna Fuel regulator dead head with #8 line from the cell to the carb. Regulator is mounted on the fenderwell I have one of those Chinese summit pumps that is similar to a holley blue pump. I have run 9.90 with my set up. My carb was built by Jim Boburka.

[Cdncarnut]

I have 2 spare Q-jets in my trailer, plus the one on the car, built by the 3 major builders, two of whom have now retired.

I have actually had a case where a carb ran great two weeks ago, would not qualify the car.
Yet, the carb which ran like poop 2 weeks earlier, ran the best ET ever.

I also have one which will get my down the track, significantly under the index, every time.

Getting the rods and hanger correct for race day can be a challenge.

There is no easy answer and really no cheap solution.

[JP1738]

Originally Posted by Cdncarnut

I have 2 spare Q-jets in my trailer, plus the one on the car, built by the 3 major builders, two of whom have now retired.

I have actually had a case where a carb ran great two weeks ago, would not qualify the car.
Yet, the carb which ran like poop 2 weeks earlier, ran the best ET ever.

I also have one which will get my down the track, significantly under the index, every time.

Getting the rods and hanger correct for race day can be a challenge.

There is no easy answer and really no cheap solution.

Well cheap is relative lol, but I'm learning quickly that's a far fetched idea in this class. No big deal, I still think I can be at the track even with a few minor upgrades for less than 13 large.

[JP1738]

Originally Posted by Mike Pearson

6-6.5 PSI is what I run for fuel pressure. You need minimum 1 gallon of fuel delivery at the carb in less than 30 seconds. I run a Magna Fuel regulator dead head with #8 line from the cell to the carb. Regulator is mounted on the fenderwell I have one of those Chinese summit pumps that is similar to a holley blue pump. I have run 9.90 with my set up. My carb was built by Jim Boburka.

Have not checked flow from my pump, but I'm going to check that today too. Mine is a Holley Blue pump but it's ancient. -6AN line from regulator to carb through an inline filter.

[Mike Pearson]

Originally Posted by JP1738

Have not checked flow from my pump, but I'm going to check that today too. Mine is a Holley Blue pump but it's ancient. -6AN line from regulator to carb through an inline filter.

All that should work if it’s mechanically in good working order. Check the flow before and after the filter. If the flow is low with the filter you might need to take it off. I do not run a filter and never have. I am real careful to keep my fuel system clean.