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Old 02-05-2024, 04:04 PM   #1
MR DERBY CITY
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Default Re: Too Slow/Q-Jet question

Just gonna give it to you straight …. Just because your car runs close to the 1/8 mile index DOES not mean it will run close to the 1/4 mile index AND have you weighed the car yet ??? Number two ..:: stockers are all about RING SEAL .. just remember that. … Cheers…..
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Old 02-05-2024, 04:12 PM   #2
JP1738
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Default Re: Too Slow/Q-Jet question

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Just gonna give it to you straight …. Just because your car runs close to the 1/8 mile index DOES not mean it will run close to the 1/4 mile index AND have you weighed the car yet ??? Number two ..:: stockers are all about RING SEAL .. just remember that. … Cheers…..
I have the car at race weight. Weighted class is N/SA and for my combo according to class racer info that's 3534 with me in it. Currently have it at 3560 with my 4 corner scales.

Mark Lewis put the engine together for me, I think he did a great job with what he had and I trust the rings are sealing properly. I haven't noticed any extra blow-by, the valve cover breather has 0 signs of oil comin out of it after 4 1/8 mile passes.

Also, I understand that this car will not backhalf and pick up time in the 1/4. I figured I'd have to go at least .10 to .15 under the 1/8 mile index to get under the 1/4 mile 13.00 index for N/SA
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Old 02-05-2024, 07:40 PM   #3
MR DERBY CITY
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Default Re: Too Slow/Q-Jet question

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Originally Posted by JP1738 View Post
I have the car at race weight. Weighted class is N/SA and for my combo according to class racer info that's 3534 with me in it. Currently have it at 3560 with my 4 corner scales.

Mark Lewis put the engine together for me, I think he did a great job with what he had and I trust the rings are sealing properly. I haven't noticed any extra blow-by, the valve cover breather has 0 signs of oil comin out of it after 4 1/8 mile passes.

Also, I understand that this car will not backhalf and pick up time in the 1/4. I figured I'd have to go at least .10 to .15 under the 1/8 mile index to get under the 1/4 mile 13.00 index for N/SA
Well, you are in pretty good hands with Mark helping you. On top of that he is a great guy….Cheers.
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Old 02-05-2024, 08:32 PM   #4
a pontiac
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Default Re: Too Slow/Q-Jet question

You need to try another q-jet for comparison, I thought I had a good one, borrowed another and was 2 tenths quicker. Also, most jet tuning is with secondary rods.
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Old 02-05-2024, 10:02 PM   #5
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Default Re: Too Slow/Q-Jet question

What Model is your 1980 Chevrolet?
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Old 02-06-2024, 01:21 AM   #6
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Default Re: Too Slow/Q-Jet question

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??
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Old 02-06-2024, 09:15 AM   #7
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Default Re: Too Slow/Q-Jet question

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Originally Posted by Adger Smith View Post
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.
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Old 02-06-2024, 12:41 PM   #8
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Default Re: Too Slow/Q-Jet question

Quote:
Originally Posted by Adger Smith View Post
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??
I also have an inline fuel filter after the regulator between that and the carb. Tim Stick advised I 86 that and he's probably right. I put it there because the car had been sitting for a long time and there was a bunch of gunk and trash in the tank and line. I cleaned and flushed everything best I could, but I stuck a filter on it to catch anything I missed just to be safe. I plan to remove that as soon as I get to work on the car again.
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Last edited by JP1738; 02-06-2024 at 12:50 PM. Reason: cant type
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Old 02-06-2024, 07:28 PM   #9
Danny Ashley
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Default Re: Too Slow/Q-Jet question

[QUOTE=Adger Smith;692814]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??[/QUOTE


Quadrajet fuel pressure depends on the needle & seat size. They are available from .110 - .150. The .110 can handle more pressure than the .150. My choice is the .135 for all applications. It has been used in two of my Super Stock customer's cars who have run in the 8 second zone. You can safely run 6 - 6.5 with it but I have fast customers who only do 5 - 5.5. You will have more problems with too much pressure than too little. A well designed fuel system will go a long way in not creating problems you may attribute to the carburetor. Locating the regulator ahead of the carburetor and allowing inertia to work for you is a plus.
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Old 02-06-2024, 02:40 PM   #10
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Default Re: Too Slow/Q-Jet question

Quote:
Originally Posted by Mike Jones View Post
What Model is your 1980 Chevrolet?
station wagon 2S 305/180
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