how to make an electronic quadrajet work without computer
12-05-2010, 08:53 PM
#1
how to make an electronic quadrajet work without computer ok check it out: i got a mid-70s chevy truck for free to beat on offroad and stop tearing up my wife's grand cherokee. the only thing missing is a carburetor.
i bought a quadrajet for 20 bucks. it is a 17085508
170=after '70
85=1985
5=california/high altitude
0=chevy
8=manual
it came on 305s and 350s in '85 and '86.
disclaimer: you may conclude by my possibly inconsistent terminology that i dont know jack **** about carburetors.. you are right:
i've seen some with the blue connector used for electronically controlled metering valves for the primaries. i've also seen the connector used for an extra shot of fuel for cold starts or some ****.
how can i tell visually if it does have electronically controlled metering valves?
and if it does have needles, it's spring loaded to run pig rich unless commanded by the computer. how do i make it not require the computer? (note: the secondaries do not rely on the computer. only primaries)
i bought a quadrajet for 20 bucks. it is a 17085508
170=after '70
85=1985
5=california/high altitude
0=chevy
8=manual
it came on 305s and 350s in '85 and '86.
disclaimer: you may conclude by my possibly inconsistent terminology that i dont know jack **** about carburetors.. you are right:
i've seen some with the blue connector used for electronically controlled metering valves for the primaries. i've also seen the connector used for an extra shot of fuel for cold starts or some ****.
how can i tell visually if it does have electronically controlled metering valves?
and if it does have needles, it's spring loaded to run pig rich unless commanded by the computer. how do i make it not require the computer? (note: the secondaries do not rely on the computer. only primaries)
12-06-2010, 12:20 AM
#3
if i wanted to spend money it sure as **** wouldnt be on any carb setup whatsoever. all i'm trying to do is figure out what i need to make a CC quadrajet work properly without a computer as CHEAPLY as possible. i got the truck for free, seriously.
12-06-2010, 12:42 AM
#4
I dont now anyone that messes with those shitty carbs for a reason man. Edelbrock, Holley, Demon, Quick fuel, the list goes on. But that? No idea. A cheap GOOD carb can be had for 40$ or so, some times less, just gotta look.
You already spent 20$, whats another 40?
You already spent 20$, whats another 40?
12-06-2010, 06:02 AM
#6
Take a BFH to that carb and turn it into fishing weights.
You will be dollars ahead if you start with a decent carb. You are only headed for frustration with that thing.
A $14 adaptor to make a square bore work with a spread bore intake.
http://www.jegs.com/i/JEGS/555/15440...ductId=1278810
You will spend more than that trying to buy tuning parts for the quadrajet.
You will be dollars ahead if you start with a decent carb. You are only headed for frustration with that thing.
A $14 adaptor to make a square bore work with a spread bore intake.
http://www.jegs.com/i/JEGS/555/15440...ductId=1278810
You will spend more than that trying to buy tuning parts for the quadrajet.
Last edited by Pop N Wood; 12-06-2010 at 06:24 AM.
does? maybe you can just disconnect it. Trending Topics
The BFH is the most fun I have ever had with a quadrajunk. If I had only started with that technique in the first place! The following users liked this post:
indyjps (09-05-2022)
12-06-2010, 10:14 AM
#10
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What's wrong with the Q-jet, I am new to carbs but I remember hearing that they have HUGE secondaries and can be tuned into pretty stout little monsters.
It's alien tech for me though, I still don't know if mine is comp controlled, but I don't believe it is LOL, it's been working well in my 1983 van for nearly 30 years though!
It's alien tech for me though, I still don't know if mine is comp controlled, but I don't believe it is LOL, it's been working well in my 1983 van for nearly 30 years though!
12-06-2010, 10:25 AM
#11
It is just like a ford 302, sure it can run good, but why waste the time and money?
Like mentioned, hell, i will mail you a god damn adapter for free if you feel like finding some hardware and use a square bore holley, ect if you want to pay shipping.
There is a reason eberyone and their mom runs a damn holley or holley base carb, better, by light years.
Like mentioned, hell, i will mail you a god damn adapter for free if you feel like finding some hardware and use a square bore holley, ect if you want to pay shipping.
There is a reason eberyone and their mom runs a damn holley or holley base carb, better, by light years.
12-06-2010, 01:32 PM
#13
I'm not saying quadrajets are junk. I am saying smog carbs with electronic feedback are not worth the hassle.
My mother in law had one of those. I was still dating my wife at the time so I spent part of every other weekend cleaning the O2 sensor on that POS.
Maybe there is some way to disconnect the electronics and turn it into a real carb. My guess is no one has ever bothered to hot rod one, so good luck.
People on craigslist are selling boxes of carbs for next to nothing. There has to be a better starting point.
My mother in law had one of those. I was still dating my wife at the time so I spent part of every other weekend cleaning the O2 sensor on that POS.
Maybe there is some way to disconnect the electronics and turn it into a real carb. My guess is no one has ever bothered to hot rod one, so good luck.
People on craigslist are selling boxes of carbs for next to nothing. There has to be a better starting point.
12-07-2010, 09:26 PM
#18
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That a feedback quadra junk.I had a 87 monte ss The first thing i did was rip the pollution **** off(ecm and all that **** lol). It ran fine(burn outs and drove good till i got my 408 done). Put it on and beat the hell out of the truck. Hey least you got a 5$ an fitting lol
12-08-2010, 09:39 PM
#19
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Throttle shafts on the quadrajet get lose and have to be bushed. It's better to start with an older model. Seal up the bottom of the primary jet well and play with the secondary metering rods. They carried 750 and 850 cfm ratings with small primaries for better fuel economy. I run a holley 750 hp dp myself. 10.42 et.
