grx45

I am in the middle of putting on a new exhaust Hooker 2055s to 3" hooker cat back on my 87 z28 camaro (with auto 700r4 tranny). I am considering taking off all the emissions stuff now since i will in year anyway when i put in a 350, and since my qjet is on its last leg.

How do i go about running the car with out the computer. Do i need a new distributor if so what kind?

What type of Holley carb should i get 4150? electric or Manuel choke?

In the meantime before i get the Holley carb can i just discontect the sensor going to the qjet and still have it run. In the context that the rest of the computer and air stuff is all ready out.

naf

iTrader: (7)

Remove the computer and you'll have to replace the dist for one mechanical/vacuum advance. You'll also need to install an alternate means of locking the torque converter.

If the computer is not hooked up the ccc-qjet will not function very well. You may get it to run but without the ECM controlling the mixture solenoid it will be dumping way too much fuel.

The computer doesn't care much if the emissions stuff is removed. The system will also still work well under a fairly stout 350.

grx45

What exactly is the torque converter? And how does it tie into the carb swap. I am most likely going to put on a holley 4150 street avenger. What do I need to do to accomplish this swap. I understand I need th TV cable is there anything else?

five7kid

iTrader: (14)

Could we understand your goals first?

As mentioned, the CC carb and distributor will handle a lot more engine than you appear to have or will be getting. Replacing it with a Holley Street Avenger will NOT improve power (potential), will reduce fuel economy, and will make it illegal for use on public roads. Did we mention it won't fit on a stock intake manifold?

The torque converter transmits the power from the engine to the transmission. Yours has a clutch built into the torque converter to eliminate slippage loss under cruise conditions. The locking of that clutch is controlled by the computer. Without the inputs from the stock carburetor and distributor, the computer will not lock the torque converter. If you ignore the lack of torque converter clutch lock-up, you will overheat the transmission 3-4 clutch pack and the transmission will eventually fail.

If the stock q-jet is "on its last leg", fix or replace it with a rebuilt unit. It'll be cheaper than buying all the new parts you'd have to get to install the Holley.

grx45

My goals are to improve upon my aging carb and ignition system. To a non computer controlled carb and ignition that i will be putting on next summer with the new 350 any way. The 350 will be built anywhwere between 300-400 hp. As for it all being street legal i only have one more inspection that i will have to get the car threw before historic plates go on it, and then it wil strictly becoming a weekend fun car and maybe start to see some trips to the 1/4 mile track.

I have seen that other people on the board are running holleys and non cc ignitions with the 700r4. Does that mean all their transmission are now prone to fail is their other ways to make the torque converter lock up work.

naf

iTrader: (7)

See Sticky at top of carb forum.

five7kid

iTrader: (14)

The CC q-jet is very capable, even on a performance 350. I'd certainly put mine in that category. Details in my vBGarage.

grx45

I understand that the q jet can be quite capable. How ever the people who are helping me with my car and future engine build are more experienced with working on holleys than q jets so i would prefer to go in that direction.

five7kid

iTrader: (14)

Time to spread your wings and soar! Leave the old behind and embrace the new and improved.

Holleys are fine for racing, and can be made to work well (most just work) on the street. But, you'll be going back to your friends a lot to get a Holley working as well as the CC q-jet will work off the bat with some one-time, basic adjustments.

But, your car, your money, your time. We'll be here if (when) you have issues with the Holley, and promise not to say, "I told you so."