TBI to carb conversion

[91rsv8]

anybody switched tbi camaro to carb

[wrightz28]

Sure, those that don't wnat to deal with the ECM.

IMO the TBI is a much better way to go. Carbed you're dealing with jetting and balance adjustements. EFI, none of the above.

[jason-1995fbody]

mines gunna be carbed whaen im done becuse i "dont want to deal with tuneing the ecm" like wrightz28 said the has to be adjusted but i got my dad helpin me set mine up so if u want to go carb just find an old guy they know more than u think

[Morley]

Originally Posted by jason-1995fbody

if u want to go carb just find an old guy they know more than u think

I'd bet I"m older than most of not all on this particular forum and I'll take EFI over a carb any day. You live in the "computer age" for cripes sake, you should be able to do something as simple as reprogram an old 8 bit computer like the early fuel injection systems use. Your .bin file is only 4k in size and it ain't rocket science.

[jason-1995fbody]

Originally Posted by Morley

I'd bet I"m older than most of not all on this particular forum and I'll take EFI over a carb any day. You live in the "computer age" for cripes sake, you should be able to do something as simple as reprogram an old 8 bit computer like the early fuel injection systems use. Your .bin file is only 4k in size and it ain't rocket science.

yeah but every time u chang something u have to reprogram we cantall aford a laptop with carbu just turn a screw

[Morley]

Originally Posted by jason-1995fbody

yeah but every time u chang something u have to reprogram we cantall aford a laptop with carbu just turn a screw

I have much less invested in my laptop, cable and software than a carb costs, not to mention the different size jets and metering rods needed to get the tune right. All told I have $134 in it. $50 for the laptop, $80 for the chip burner and $4 for the components to make a cable. The software was free.

[big red studebaker]

You can change to a cafburetor if you just have to. As for having to reprogram the computer, thare are power chips available for most aplications, so this is not a big problem.
To change to a carburetor is no big thing. First you need to determine what you expect from your motor. The next thing is to put a parts package together. 1. intake manifold 2. carburetor 3. distributor 4. fuel pump 5. fuel lines.
Now is the main question Are uou changing from a stock TBI system or Just instaling an engine that is equiped with TBI. On a venicle that has TBI instaled
you must remove the electric fuel pump from the gas tank as TBI uses much higher fuel presure, and will cause fluding ofthe carburetor. Some pepol try to use mechanical fuel presure regulators to controal the presure. I do not recomend this as when under ful power the carburetor is starved for gas.
Remove the TBI intake manifold, being sure not to drop any dirt or foreign object into the engine, while removing the manifold. Now install your chosen manifold using new gaskets. I like to place a little RTV sealer at each corner of the manifold gasket at the place the head gasket and manifold gasket meat.
With this dun now install the carburertor of choice. Route fuel line to the carburetor, Do Not use rubber hose for this, Gasoline is flamable, and a rubber hase can leak. Now uou must fabrocate som type of mounting bracket for the acceleration lincage. If I new the vehicle and engine I have some experience with this.
Now comes the destributor Irecomend a good Malory, as this is simple to hook up. The big question now is what to do with all of the wires you have left over from the computer. Question - Do you expect to use a TBI later. If so just determine the wires you need for the aproperate gage sending units and wire tie the rest into a neet bundel and secure out of the way. If you are not going to use these wires agan just clip them off, leaving a clean looking engine bay. You may want to tape any exposed wireing ends to prevent future troubles.
Now just tune the engine to carburated specks, and good luck

[SG007]

I converted my 92 from tbi to carb....worst thing I ever did. I would stick with efi. just my

[Morley]

Don't forget a bracket for the TV cable (auto trans) and the switch to keep torque converter lock up.

[Whoaru99]

Originally Posted by 91rsv8

anybody switched tbi camaro to carb

Why do you want to do this?

[Whoaru99]

Originally Posted by jason-1995fbody

yeah but every time u chang something u have to reprogram we cantall aford a laptop with carbu just turn a screw

There is a lot more to properly tuning a carb than merely turning a screw.

That might get your idle mixture close, but it does nothing for primary or secondary jet sizes, pump shooter nozzles and pump cams, vacuum secondary springs, metering rods, choke adjustment, etc. Of course, these are a mix-match of terms from various carburetor styles, but none the less, there is much more than just turning a screw to do it right.

IMO, it's harder to properly tune a carb than a electronic system....

[wrightz28]

Originally Posted by jason-1995fbody

yeah but every time u chang something u have to reprogram we cantall aford a laptop with carbu just turn a screw

You my friend, are highly mistakened

[jason-1995fbody]

at any rate i know my engine set up will run better with a carb than it will with the fuel injection system i wont have to have things like the egr valve, o2, air system, and any other emisions related crap "tuned out" i just wont have to deal with it
yes for a daily drive efi all the way but if you need to make a quick tweek at the track it takes 2 minutes to change jets

[Morley]

Originally Posted by jason-1995fbody

wont have to have things like the egr valve, o2, air system, and any other emisions related crap "tuned out" i just wont have to deal with it

Then I would suggest that you really don't know much about EFI. EGR isn't so much an emissions control as it is a detonation control, the A.I.R. system isn't required for EFI, the ECM has no way of knowing if it is even there much less if it is working....Even the carb guys are now running O2 sensors and gauges, it lets them know quickly if the carb is tuned right. Cat converters have nothing to do with the ECM or engine controls. This is all OBD1.
Now if you want to say a carb will out power EFI You'd need to look no further than Lingenfelter Performance Engineering.
And I can change "tunes" faster in my EFI car than you can change jets...takes 10 seconds or less. Not to mention the new emulators that let you tune on the fly.
Carbs are dinosaurs

[jason-1995fbody]

sorry we cant all afford laptops to leave in our car



and as far as the other stuff it was general stuff and yeah an o2 sensor is great for a a/f ratio gauge but that has nothing to do with the computer

also go to the drag strip one day and look you will find more carbs than efi

yes iknow efi can be made to run anyting but for me and my budget a carb will work perfect
unless you want to come set up my tpi unit for me


also earlyer you mentioned you have less in a laptop and cable than a carb how is this i got a holly 650 cfm with mechanicle secondaries race ready for 200 bucks
now insted of arguing how bout you school me in how to get the things i need and how to use it if i were to stay with efi