Will 454 injectors work on a 350 stock TBI. Looking to gtet more fuel into the TBI without having to buy aftermarket injectors.

Any ideas on anything that might fit in there I can grab from the local pick and pull somehting with alittle more flow?

Or is that strictly going to be an ECM thing.

I was running alittle lean stock, and I am doing the ultimate tbi mods. I am hoping it wont lean it out even more.

I am of course making my fpr adjustable, I hope that will help enough to solve me lean problem.

BTW ecm and all is ocmpletely stock.

 

well if you need more fuel then just putting in bigger injectors wont help out that much, you really need a way for more are to get in to mix with the larger amounts of fuel, and a lean condition is usually fixed with the fuel pressure regulator. larger injectors are usually used when the engine demands more fuel to make the power or to keep from knocking/pinging.
but i'd say if you want/need more fuel like what the 454 injectors put out change over to a 2" ID bore like whats found on the 454 and you'll also need a different manifold if you dont already have one.
My .02 cents.

 

anyonekow where to find a manifold with the 2" bores? Do they ake them to fit on the 350? or do you have to go with a carb, and then the adaptor?

If so where do you get the adaptor lol...yeah im new.. im learnen tho!

 

How do you know your running lean? If your still stock then it should be ok unless there is a problem with the fuel system or a bad O2 is giving false outputs to the ecm. The ultimate tbi mods wont change your fueling needs much at all. You should be fine with the stock injectors. Buying the 454 injectors will be the biggest mistake you could make with a mostly stock setup. It will go from being percived as lean to being rich as hell. The 454 tbi and possibly some 65 pph injectors mated to a carb intake and adapter would be pretty good upgrades. Look around for the adapters. I have the holley adapter and edelbrock performer intake along with a 670 tbi from holley and theyre pretty good upgrades for a mostly stock 350 engine. Id avoid the holley adapter, though, the tbi no longer sits centered on the intake. Do a search for tbi adapters. Its been covered before by others who have used carb intakes.

EDIT: opps... didnt see you ahd a 350 and not a 305.

 

so would the 454 TBI and intakl be a good upgrade for the 350 then you said ooopps so ya left me confoooosed.

I'm getting a pretty good ping under hard accleration so I a just assumed I was lean.

Can't wait until I can afford the adld cable for me laptop.

 

well check you timing if its pinging just check it dont change it. o get a ping noise in 4th gear but thats the advance timing teh ecm puts in the ecm advances my timing to 22 degrees but if i leave EST off and set it at 10 degrees if runns fine. but usually 10 psi is good on the tbi. my old setup i was pushin about 46psi threw the injectors i had a bad diaphram and pressure was at its peak.

i would say if your current setup doesnt suit your current hp need upgrade to a bigger better TBI.

 

Ok so I suppose (done the tbi mods and homemade intake)
So i should probably go with headers, 454 tbi, and a 4 barrel intake with an adaptor. this should improve power a bit?

After that any more mods are going to require a chip burn i suppose eh?

**edit**
Now i suppose I hit the spot every motor monkey goes through, just about every free mod. Now comes the expensive part, just guess i collect stuff peice by peice till i get the setup i want.

Anyone have a decent intake for a 350 what will fit the 454 setup for sale? hehe

 

i origionally thought you had a 305 by mistake and i posted something completly different. As for the exaust, youll want to get headers with a 3 in y-pipe if you can find them in that size for your model, new cat, and a high flowing cat-back system. The stock exaust is really restrictive and the whole thing needs to go. Make sure you dont get components with stock diameter piping if possible, that will only maintain the restrictions in your exaust system.

 

if your bypassing or disableing the advance from the ecm then that is a major no-no. Your timing curve is entirly under the ecm's control and unhooking the est pin or by-pass connector will leave you with no advance at all. Ive seen that one done before. A carb swap with the stock cc hei dist still in place. The car will perform like pure **** because there isnt any advance at all. If your gettign knock under part throttle loads in high gear, reduce the base time to what is called for for your perticular car and also check to make sure the egr isnt clogged or malfunctioning.

 

I haven't messed with the timing at all, it's completely stock. The wires are still connected to the dist. It coiuld be the person before me advanced the timing too much. I'll have to check that out. It's just too dog a$$ slow for a 350 tbi or not

 

thats just it it runs great w/o the est connected but i havent drove it like this before, rite now the timing is at 0* i am gonna set it back to 10* and try it from there, im pretty sure the EGR is okay i have been thinking about blocking if off. the only thing that suks about the way it runs is chugging on start-up and blowin black/blueish smoke but i think that one is attributed to the valve seals. chugging i can only wonder if thats in the ignition i made a mistake and put in +4platinum plugs on a stock HEI.

 

AFter I did these mods and increased the fuel pressure, I had the same problem you just described, dark smoke rough idle etc. as soon as she warms up and goes into the mode where it reads the o2, it runs fine but the ses light pops.

Did you raise your fuel pressure? if so the stock ecu vbefore it taps the o2 for reeadings may not be programmed for it, i think thats my problem.

 

set your fuel pressure back to what it was stock. Your definatly adding way to much fuel if its blowing black smoke and having trouble idling. Not to mention its bad to wash the cyl. down with fuel. you really need to get winaldl to see how the computer is responding to the extra fuel. The fuel that the ecm delivers is dependent on the injector size your using and changing the injectors or fuel pressure without making adjustments to the prom will result in the computer giving alot more fuel then it thinks it is.

 

im as low as i can go on the tbi 10 PSI. i actually had to rebuild the TB the gaskets and o-rings were no good so while i did that i lowered the psi to its minimun along with completing the Ult. TBI mods. oh yea the ses light always comes on and stays on it only says there are no codes and something else no signal from the distributor. i find that wierd it starts and runs.