Qjet on a ls1
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Qjet on a ls1
this thread is a good example of the TGO group now days. everyone thinks they know it all and if someone wants to do something different they get jumped on and told it cant or shouldn't be done. I mean geese its not like he was trying to drop a 4 cylinder Nissan engine in the car and told everyone it was going to hold the worlds speed record

maybe answering the question with ... INFO
so weeding through this what I get for an answer to his question is this... get the carb intake (dual plane would work best) . the carb front timing cover to run the ford dizzy W/ mechanical fuel pump if you so desire and a spacer plate for the intake to accept a spread bore carb such as the Q-jet
and height may be an issue with the spacer plate

maybe answering the question with ... INFO

so weeding through this what I get for an answer to his question is this... get the carb intake (dual plane would work best) . the carb front timing cover to run the ford dizzy W/ mechanical fuel pump if you so desire and a spacer plate for the intake to accept a spread bore carb such as the Q-jet
and height may be an issue with the spacer plate
I've also been reading on a new front distributer conversion kit that allows you to use an standard chevy coil-in-cap HEI set up. Now that's what I've been waiting for. That should allow us to use our factory computers with the CC Qjets if we so choose. YAY Now, more reading to do!
Last edited by Ozz1967; Jun 11, 2011 at 05:12 AM.
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Re: Qjet on a ls1
Even if not, it shouldn't be too hard to cut apart the Ford and HEI distributors, then splice the HEI top onto the Ford stub with good welding.
This is how the diesel guys get tachs for their 6.2 diesels. They splice HEI tops onto the vacuum pump stubs. Cheap and easy.
But tossing out the LSx electronics for a CCC Q-Jet? What's the advantage?
This is how the diesel guys get tachs for their 6.2 diesels. They splice HEI tops onto the vacuum pump stubs. Cheap and easy.
But tossing out the LSx electronics for a CCC Q-Jet? What's the advantage?
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: Qjet on a ls1
You can buy that distributor already made. It has been made for many years now.
Its called a DUI, Davis Unified Ignition I think it is. They use the big cap HEI top for GM, chrysler, Ford, AMC, and all kinds of stuff.
Its called a DUI, Davis Unified Ignition I think it is. They use the big cap HEI top for GM, chrysler, Ford, AMC, and all kinds of stuff.
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Qjet on a ls1
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: Qjet on a ls1
You can use the DUI distributor; If you call them, they will make it a CCC distributor. If you happen to get one used, you can do it yourself. Considering the scope of the rest of the modifications, this one will be easy.
1st, you remove the vacuum advance assembly. 2nd, remove the 4-pin HEI module. 3rd, Install 7 pin module, you will see it has the same 2 pin internal hookup that the 4 pin module has where it hooks to the mag pick up inside the distributor.
Last, you will need the internal harness from an 81-90 CCC distributor. Any will work from any GM big cap HEI. This harness goes from the 7 pin module, has a pig tail with a ground on it, and then goes outside the distributor so that you can hook it to your ESC/ECM harness. I like to run it out the old vacuum advance hole, but you can grind a little hole in the base, to match an original CCC distributor to make it right if you want.
Buick V6 from 1981-1988 with distributor, Chevy V8 to 1986, Olds V8 from 1981 to 1990, Cad V8 with distributor in the 80s, they can all donate that harness.
1st, you remove the vacuum advance assembly. 2nd, remove the 4-pin HEI module. 3rd, Install 7 pin module, you will see it has the same 2 pin internal hookup that the 4 pin module has where it hooks to the mag pick up inside the distributor.
Last, you will need the internal harness from an 81-90 CCC distributor. Any will work from any GM big cap HEI. This harness goes from the 7 pin module, has a pig tail with a ground on it, and then goes outside the distributor so that you can hook it to your ESC/ECM harness. I like to run it out the old vacuum advance hole, but you can grind a little hole in the base, to match an original CCC distributor to make it right if you want.
Buick V6 from 1981-1988 with distributor, Chevy V8 to 1986, Olds V8 from 1981 to 1990, Cad V8 with distributor in the 80s, they can all donate that harness.
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: Qjet on a ls1
Necessary? Not sure. I think it would be the easiest.
The CCC ECM needs a hi reference and low reference. I'm not sure if your crank and cam sensor signals would be right, and I'm not sure how you would control your 8 spark plugs without a distributor if you're using an older ECM.
The CCC ECM needs a hi reference and low reference. I'm not sure if your crank and cam sensor signals would be right, and I'm not sure how you would control your 8 spark plugs without a distributor if you're using an older ECM.
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Qjet on a ls1
The 'normal' carb ops for an LS1 are to us an aftermarket MSD controller to run the spark off the coils.
What I was thinking of, was instead of using the MSD controller, and since I already have the CC Qjet, was use the factory ECM to run the CC dizzy to control the timing and spark and CC Qjet (My favorite carb). ON the surface, once you have the LS1 modded to use the distributor, it should work...in theory. IF you can get a CC distributor to work. All of the LS1 carb mods say you have to use that ford style distributor which obviously would be incompatible with the GM ECM.
What I was thinking of, was instead of using the MSD controller, and since I already have the CC Qjet, was use the factory ECM to run the CC dizzy to control the timing and spark and CC Qjet (My favorite carb). ON the surface, once you have the LS1 modded to use the distributor, it should work...in theory. IF you can get a CC distributor to work. All of the LS1 carb mods say you have to use that ford style distributor which obviously would be incompatible with the GM ECM.
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: Qjet on a ls1
As I stated in an earlier post, its not incompatible. You have to buy a DUI small block ford distributor.
http://www.ebay.com/itm/Davis-Unifie...143544&vxp=mtr
The above distributor can be made to work. Its how I make big cap Buick/Olds distributors work with ECMs when I can't get a proper 1980's distributor. Like I said before, you start with that big cap HEI, remove the 4 pin module from inside, insert your 7 pin module, and you are now plug and play with your wiring harness.
Take pictures if you do it so that everyone can see it, please.
http://www.ebay.com/itm/Davis-Unifie...143544&vxp=mtr
The above distributor can be made to work. Its how I make big cap Buick/Olds distributors work with ECMs when I can't get a proper 1980's distributor. Like I said before, you start with that big cap HEI, remove the 4 pin module from inside, insert your 7 pin module, and you are now plug and play with your wiring harness.
Take pictures if you do it so that everyone can see it, please.
On Probation
Joined: Oct 2008
Posts: 6,319
Likes: 19
From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: Qjet on a ls1
I must strongly agree that in many street-critical ways the CCC QJ is the bast carb ever devised. But the Carter / Edelbrock is an extremely close second place. I'm no great shakes on tuning Holleys, but I can make an AFB equal the HP and beat the MPG and emissions of any Holley I ever went up against. The Carter was well-designed for trial-and-error tuning. If you're any good with keeping a log of each change, and the results, you can get excellent results from the Carter easier than any other carb. Won't go fat up top like Holleys, but won't quite equal the MPG and emissions if the CCC QJ. And will give the same sound as a Holley. I'll take a Holley over having nothing to drive, but Holley is always the worst choice for real-world use. How many of y'all live at the dragstrip, literally?
On Probation
Joined: Oct 2008
Posts: 6,319
Likes: 19
From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: Qjet on a ls1
Lately, i am really not justifying EFI as far as power either, the carbed rides are getting it done pretty damn dirty. And i have mentioned before, it is just cheaper to carb a LS, some still want to argue the fact, but unless you get a retarded cheap deal on the stock LS1 parts, it might be close, but the power will be way down.
Some, like myself, lack the patience to get a car wired for EFI, and then revert to a return system with a higher pressure fuel pump as well, then there is the tuning factor and what is wrong with such and such sensor if something happens, it is too easy to avoid for me and others.
On Probation
Joined: Oct 2008
Posts: 6,319
Likes: 19
From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
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