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Qjet on a ls1

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Old Jun 11, 2011 | 03:55 AM
  #51  
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Car: 1984 Trans Am
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Re: Qjet on a ls1

Originally Posted by 88 350 tpi formula
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
Edelbrock makes a carbed intake set up, pretty sure the picture shows it to be a multi-spread intake capable of taking both spread and square bore carbs. I'm also sure it wouldn't take much to have a machine shop tap the screw holes for you.

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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Old Jun 11, 2011 | 07:29 AM
  #52  
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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?
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Old Jun 11, 2011 | 08:37 AM
  #53  
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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.
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Old Jun 11, 2011 | 08:40 AM
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Re: Qjet on a ls1

But they don't offer a CCC version.
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Old Jun 11, 2011 | 09:57 AM
  #55  
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Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Qjet on a ls1

Originally Posted by ronnjonn
But they don't offer a CCC version.
But with the adapter, if a standard distributor will fit, I can use my CC distributor. I haven't read anything anywhere so far that says it's a specific distributor other than the set up that uses a Ford distributor.
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Old Jun 11, 2011 | 09:46 PM
  #56  
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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.
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Old Mar 5, 2013 | 09:26 PM
  #57  
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Re: Qjet on a ls1

So is the old style distributor necessary to give the ECM timing data? I haven't been able to find much on what the ECM needs to control the mixture solenoid.
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Old Mar 5, 2013 | 09:44 PM
  #58  
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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.
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Old Mar 6, 2013 | 10:06 AM
  #59  
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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.
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Old Mar 6, 2013 | 04:27 PM
  #60  
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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.
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Old Mar 10, 2013 | 03:11 PM
  #61  
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Re: Qjet on a ls1

Originally Posted by five7kid
I still am a mod on the carb forum. The CC q-jet, in my opinion, was the best q-jet ever offered. The Edelbrock carbs are about the worst choice in almost any situation.
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?
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Old Mar 10, 2013 | 03:21 PM
  #62  
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Re: Qjet on a ls1

Originally Posted by ZONES89RS
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.
If you only care about 500 HP from 4500-7000, then yes.
Originally Posted by ZONES89RS
For fuel economy and emissions, the EFI is the way to go, some say that carbs can get the same economy, but i have yet to see anyone compare it in the same cars.
Thing is that EFI runs 14.7:1 closed-loop for emissions reasons. Carbs can run a leaner 17:1, but that increases emissions.
Originally Posted by ZONES89RS
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.
But also illegal under not-always-enforced federal law, unless you use the CCC QJ. If you do get enforced by surprise, then which is the lesser hassle and lesser cost? Staying legal.
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Old Mar 10, 2013 | 03:25 PM
  #63  
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Re: Qjet on a ls1

Originally Posted by ZONES89RS
better from what my experiences have been.
When you go in prejudiced, then nothing will sway you, you already swallowed the placebo.
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