so i have given up on my tbi set up and am looking in to a carb but was told i cant use my stock distributer ignition isnt really somthing i have looked to much into so im almost running blined here but if someone could explane to me why i cant use my distributer that would much appreciated.


I am not taking everything out of the car just unpluging the tbi and tucking the wiers away for now so does the tps or iac have somthing to do with the distributer working right?

thanks for the help

 

If you are switching to carb you will need a vacuum advance distributor.

Your dist relies on the PCM to tell it when to advance/retard the timing and uses info from various sensors you will be pulling out. Without your TBI stuff the dist won't control the timing properly.

Look for a HEI vacuum advance distributor.

 

TBI needs the throttle position sensor to adjust timing. If you adapt the TPS to the carb, you can use your stock distributor. You'll still need to keep your ecm/wiring/sensors, but disconnect the throttle body. On my 89 step side, I ditched all of it and used an HEI for simplicity. You'll still need to deal with the fuel pump though. You'll need a return style regulator.

 

I swapped out to a carb in my 92 RS and used the Mallory 4309 fuel pressure regulator along with a HEI distributor. I initially set the fuel pressure to around 4.5 lbs of pressure but bumpet it up to almost 6 lbs of pressure.. I'm running a Holley 80457 600cfm carb on a 89 Vette L98 350 engine..

 

Yeah for the fuel I was going to use a return style regulator and hook the return line up to the sock return line from the tbi set up

And thanks for the help with the distributor but I was looking around and people were saying that if you go with the vacume advance you had to cut the wires from the stock coil and hook then up to the distributor some how?

 

Of course you will have to change a couple wires, but you can not use the factory distributor. It will be locked at the same timing all the time. You must use a non computer controlled distributor. This is not optional. It must be done or the engine will have no power and get terrible fuel mileage.

 

As I said, you CAN use the stock distributor if you fabricate a bracket and mount the TPS to the carb. It will work fine. Their may even be an aftermarket bracket available, not sure. Timing will function fine with the throttle body unplugged. It'll still need the computer though for timing, so you really aren't making things any simpler in that respect. It would retain knock retard as well though. A lot of folks do this to also maintain trans control in Chevy trucks, but that's a non-issue for the Camaro, especially with a 5 speed. I say go with the HEI for simplicity, it'll be much easier. You just need to run one +12V wire to the hei that's hot with ignition on. I used the pink wire from the stock ignition.

 

Ok one last question what do I do about a throttle bracket I have vortec heads so the bolts are different and what about return springs? are there any companies that make them for the vortec bolt pattern?

 

Lots of options. I'd use one that attaches to the carb base.

http://www.summitracing.com/search/?...0bracket&dds=1

 

will those work with the stock throttle cable?

 

Should, I used the stock TBI throttle cable on my 89 step side. I had to rob a cable stud to attach to the carb throttle lever off of a Qjet I had laying around though.

 

ok sorry for all the questions but this is my daily driver so I have to get it all done at once can't be waiting on parts but what about the fuel lines if I'm going to keep my stock hard lines what size are they? Don't really know anything about the fuel lines and how then do the sizes.

Thanks fo all the help

 

I got the fitting sizes from this thread when I did the swap.
http://www.fullsizechevy.com/forum/g...t-takes-2.html

they are NPT to metric. They should be the same size, but the Camaro has hard lines.

 

Ok thank you but would anyone be able to recommend a good fuel pressure regulator I have a bbk intank pump and I need to get the pressure down I had a holly one but it wasn't the right type of bypass regulator and where do I hook the wires up for the electric choke is there some sensor that I need to buy for it?

 

Fuel system.... I have always used the Malllory 4309 regulator mentioned above. How to patch it into the stock fuel lines: forget all the metric-to-whatever adapters. Cut the factory soft lines right in the middle where they come off the driver's side frame rail. Install barbed hose unions in the ends of each of them. The larger feed line is 3/8" and the smaller return line is 5/16". Now you have a fuel line fitting you can install soft line onto and run it wherever you need it (to the reulator). I installed my Mallory 4309 on the front of the driver's side strut tower. You can put yours wherever you want, but my install was pretty typical location for everything.

Electric choke only requires an electrical connection that is hot any time the ignition is on. And it draws only ~1 Amp, give or take, so it doesn't require a massive power source. I often use a wire on the wiper motor of old cars that never had an electric choke, believe it or not. But on a more modern car like yours there should be many places you can tap in for appropriate power.

 

ok thank you guys for all the help