how to make an electronic quadrajet work without computer
12-10-2010, 09:16 AM
#21
i just found a non-electric older style q jet for free. so im just gonna use that. the whole point im making that nobody is understanding is: i wont use a carburator at all unless its almost free. if i wanted to spend money on this beater i would put a junk yard 6.0 in if with a harness and computer. the only reason i got the tuck was to jump sand dunes and practice body work.
Last edited by rumblebox; 12-10-2010 at 09:24 AM.
12-10-2010, 09:50 AM
#23
I think what people are trying to say is sometimes things that are free turn out being pretty damn expensive. Like that free hot tub someone gave me a few years back.
Sounds like it worked out for you.
Sounds like it worked out for you.
12-10-2010, 02:07 PM
#29
Exactly, if you dont want to spend "anything" on a carb unless it is near free, you must be broke as all hell. A used holley can be had for 40$ or less.
12-10-2010, 04:29 PM
#30
i dont like carburetors at all, so regardless of how much money i have i can't justify spending anything more than chump change. all i want is for it to run efficiently and reliably. it's an offroad truck, not a street truck. plus, the Qjet is better for level changes, hills, etc.
Last edited by rumblebox; 12-10-2010 at 04:45 PM.
12-13-2010, 01:41 AM
#31
Put the non feedback carb on it. Vacuum is what controls the metering rods at idle to control mixture. If you need more fuel remove the top of the carb and raise the needles up a notch on there springs. Less fuel do the opposite. Although WOT tuning is nearly the same as any carb jetting is key. The metering rods aren't the only means of idle tuning for these carbs but a factory carb usually has lead plugs covering the idle mixture screws keeping them from being tampered with unless you take the time to drill them free. Although if the engine is a stock 350 with stock intake and all the tuneup should be nearly spot on.
You can also make the secondary's react faster by removing weight from the counter weights on the upper flap if yours is equipped that way. But be careful because if you go to far it will get a big breath of air and fall flat on its face if they open too fast.
I am a believer in qjets for there gas mileage and the fact that all gasket surfaces are above fuel level and you pretty much don't have to worry with leaks.
Though they do have there draw backs such as getting the metering rods correct for engines that may have been modified. Finding parts isn't nearly the breeze as it is for a holley style carbs. And the round plunger type accelerator pump isn't the best setup anyone has ever seen.
But they did there job for years and years and were used as a highly sought after replacements for thermaquads off old mopars. Typically a hot rodder would seek out a qjet off a Cadillac 500 engine seeing they were 850s.
You can also make the secondary's react faster by removing weight from the counter weights on the upper flap if yours is equipped that way. But be careful because if you go to far it will get a big breath of air and fall flat on its face if they open too fast.
I am a believer in qjets for there gas mileage and the fact that all gasket surfaces are above fuel level and you pretty much don't have to worry with leaks.
Though they do have there draw backs such as getting the metering rods correct for engines that may have been modified. Finding parts isn't nearly the breeze as it is for a holley style carbs. And the round plunger type accelerator pump isn't the best setup anyone has ever seen.
But they did there job for years and years and were used as a highly sought after replacements for thermaquads off old mopars. Typically a hot rodder would seek out a qjet off a Cadillac 500 engine seeing they were 850s.
12-13-2010, 05:04 PM
#34
I tried to keep it out of the Qjet bashing mode, but notice he said to start with the non-feedback carb. So don't know that they were all less than useful.
How many fishing weights did you get out of it?
How many fishing weights did you get out of it?
05-26-2011, 05:41 PM
#36
LOL....we got 900cfm out the quadrajet back in the early 80s.
That said, the electronic quadrajets can yield some amazing mileage and still put down decent performance as long as the computer is receiving proper information from the sensors and all solenoids are working properly.
Most of the quadrajet mojo is beyond the average technician considering the differences over the years in air valves, metering rod hangers, metering rods, float level fulcrum changes, secondary air door limiters.....etc....but that doesn't mean they don't work.
A non-electronic quadrajet still has a ton of different applications with the springs, orfice and air bleed sizes, porting locations for vacuum signals, metering rod tapers and height, secondary air valve spring tension....etc that will confuse the **** out of the "slap a holley on it" crowd but a real man has no trouble at all with them.
That said, the electronic quadrajets can yield some amazing mileage and still put down decent performance as long as the computer is receiving proper information from the sensors and all solenoids are working properly.
Most of the quadrajet mojo is beyond the average technician considering the differences over the years in air valves, metering rod hangers, metering rods, float level fulcrum changes, secondary air door limiters.....etc....but that doesn't mean they don't work.
A non-electronic quadrajet still has a ton of different applications with the springs, orfice and air bleed sizes, porting locations for vacuum signals, metering rod tapers and height, secondary air valve spring tension....etc that will confuse the **** out of the "slap a holley on it" crowd but a real man has no trouble at all with them.
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