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 QJ vs Holley spreadbore for a tow rig 
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 152
Location: Frostburg, MD
Hello All,

How much economy would one give away with the holley? [650 or 800]. 454 pickup, 10-12K lbs CGVW.

Thanks.
Dave


Thu Jun 09, 2016 9:15 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1701
The Spreadbore Holley is like buying a lottery ticket, sometimes you win. QJet or Holley Spreadbore is like any other carb, you can make any carb get good mileage if you tinker with it.


Thu Jun 09, 2016 9:52 pm
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 152
Location: Frostburg, MD
Understood,

I love the QJs, but I can get a pretty nice 6213. I like the idea of being able to run partly into the secondaries w/o worry. I have fought with QJs that were finicky while the air doors were partly open.

thanks.
Dave


Thu Jun 09, 2016 10:46 pm
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Joined: Fri Feb 08, 2013 2:37 pm
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Whoops, sorry didn't answer this sooner. Have you used the SB Holley yet?

The QJet secondary is easily tuned, particularly with a WBO2, but the catch is you need a broad selection of rods and hangers so you can manipulate the early and intermediate ranges of the air valve opening. You can bend the hanger to adjust the rod depth but the selection of rod size/shape/taper-rate/etc. is important, and, of course, the spring tension. I think there are 97(?) secondary rods listed in Doug Roe's book.


Fri Jun 24, 2016 12:17 pm
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 152
Location: Frostburg, MD
Hi Tuner,

sorry, I didn't realize that you responded. I haven't fooled with a Holley SB for 20 yrs. I was just a thought, perhaps. I do have a pretty good stash of QJ rods and esp hangers.

Thanks.
Dave


Tue Aug 02, 2016 8:36 pm
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Joined: Fri Feb 08, 2013 2:37 pm
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Obviously, the hangers and the spring tension are the means to control the secondary intermediate load. Take care to pay attention to the largest diameter of the metering portion of the rod, some are smaller (richer) than others in the 'closed' range, .132" to .135" or so.


Tue Aug 02, 2016 9:41 pm
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 152
Location: Frostburg, MD
thank you


Mon Aug 29, 2016 8:41 am
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Joined: Fri Feb 08, 2013 2:37 pm
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What did you figure out? Did yo use a QJet?


Mon Aug 29, 2016 3:02 pm
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 152
Location: Frostburg, MD
tuner wrote:
What did you figure out? Did yo use a QJet?


I finally had time to go through the brakes and such and get it State inspected and tagged. It's still running on stock TBI setup.

I'm not too swift on such things, but I keep looking back at you posts on the subject of;

"Replace the original O2 sensor with an Innovate LC-1 programmed to mimic the original sensor signal......... "

Thanks
Dave


Tue Aug 30, 2016 4:19 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1701
Now the LC-1 is improved to the LC-2, or use the MTX-L so you have a live gauge so you can see the A/F and think about it. They both have the same programmable analog out. Do you have any Innovate WB02 now? They all have the analog out. I don't know, but I think the controller electronics is the same but with the gauge, you get a gauge.


Tue Aug 30, 2016 5:24 pm
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