88FormulaKiller

just wanted to add some input, i have a ws6 formula that came with the 305 tbi which smoked the rings, so, i replaced it with a 350 tbi...i did Not swap anything, i bought the engine from my father whose worked for GM for 23 years so it wasnt a mistake like some people have asked me, it is a 350!...car has ran absolutely mint for over a year. no swapping.

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duderjay

Can the ecm out of a a 95 chevy truck fit and be used in a 88 iroc? The engine out of the truck is a 350 all done up, the prom in the truck ecm was burned by pro's on a dyno. Its a tbi.

I have a 305 tbi in my Camaro. I am being offered the whole works to throw into my camaro.

Basically I am wondering if I can use the ecm and the prom out of the truck for a short cut and just drop it into my car.

The truck rates 286 horses at the wheels. I kind of figured it would go good in the camaro for instant horsepower with out to many hassles

GMZombie

just one question as i have most of this process done since my engine is older and i cannot use an aftermarket tbi intake cause they didnt make one for pre 87 heads umm where can i get the vacuum for the brake booster?

Jono4820

FYI I just completed the 305 to 350 swap. The doner was a 92 9c1 caprice to my 91 RS. In addition to keeping 350 knock sensor swaping the ESC module, I HAD to also swap the ECM's swaping just the chips worked but the car ran poorly after swaping the chips back then swaping the ECM's everything is grrreat!

DyingYoung138

I noticed most of you swap with TPI, but I have a 305 carb... would it be the same thing as what you guys say to swap a 350 carb in? I'm not that literate with all this yet, so I was curious on the matter. Would I have to mess with any timing, computers, or anything just to pull a 305 out and put in the 350, both being carb? Or what all would I do to change everything to TPI (I think TPI is more reliable and can push more hp and torque)

RSCAMRS

I was thinking about putting a 327 in my 92 Camaro RS. Do you think I would need to change the TBI injectors or the ECM module for that? seeing it is so close to the 305 now in it.

titchener

As a first step you would get in the ballpark by bumping up your fuel pressure to compensate for the increased bigger inches. You need to bump it by the square of the ratio of the cubic inch increase, so assuming your stock pressure is at 11.5 psi (a typical stock TBI pressure):

New Pressure = 11.5 psi * (327/305) * (327/305) = 13.2 psi

The cheapest and easiest way to do this is to swap in a TPI fuel pump and either get one of the adjustable regulator kits (Jet, cfm-tech, xtremefi) for your TBI or take the spring out of it and use an inline external regulator and gauge (I like this way better, the conversion kits can be a pain to adjust).

For best performance you would want to do a full chip tune on the car (even if you just keep the 305) but the fuel pressure increase should get the car running ok for starters.

Paul T.

Ozz1967

I just did this 350 swap and kept the factory CC carb and distributor set up in my 84 T/A. I've run into no problems, the carb is big enough. The only thing I would really worry about now are these...

--Get new O2 sensor
--Get 350 knock sensor
--bump your timing depending on the cam...I'd say 9 or 10 with a strong cam would be just about right. I'm running a larger cam so I'm pushing 12 advanced initial timing.
--You're carb is big enough the way it is though it may run a little lean. I haven't run into any problems with mine though.

Hope this helps! If you have any questions, feel free to PM me.

Regal105

has anyone ever tryed to swap a 305tbi for a 454 tbi?

Regal105

i just have one question that really buggs me about the whole 305 to 350 swap, if tbi 350 is put into a 305 tbi car, why cant the whole 350 ecm be used? are the plugs different? please clarify

dctrumpet

To make it non-complicated this is my best explanation:
The actual TBI unit is pretty much the same from a 305/350. The main difference between the 305 and 350 is the knock sensor, esc module and injectors. These sensors are based on engine displacement. That being said, the 350 requires more fuel thus requires a different "chip" than the 305. Computers can be the same, but the chips are different. You can put a 350tbi base on a 305 and not have to "tune" it as long as you put back the 305 injectors.

Not sure if this is what you were asking or not??
----------
I think I know what you were asking now that I re-read what you stated.

If you are doing a basic 350 stock install into a 305tbi vehicle you can used the stock 350 ecm and chip. As long as the 350 doesn't have any mods that require tuning

Regal105

yeah the last part was what i was lookin for stock to stock 305 to 350 swap

pony exp.305

True, Best way leave TBI on 305. I am newbie here..I read a lot here relating TBI. I can't believe some of them remove TBI out for Carbed. I used to have one 1991 Camaro RS with nice 350TBI/ 310 hp for drive daily. Really strong acceleration and run over 40K miles without any problems. I decided to sold it.
Piux here:


Few weeks later, I miss to drive 1991 camaro rs. One day, I went to Appalachian Mtns for ride around. I found one 1991 Camaro, was parked under tree and very dust over car. The engine 305 TBI was not started. I bought it for $950.00 and had to tow it to my home. I found the ignition module was not good and replaced it then It started with BIG BLUE SMOKE out from exhaust.




I think about going to rebuild on engine/tranmissioon soon when I have enough money/time schedule.

cnnbrunson

so the 305 throttle body wont work on a 350 or do i need to just swap the injectors

dctrumpet

305 and 350 TBI are the same. Only real difference is the injectors

cnnbrunson

Does anyone know what the stock part number is for the Chip from 8746 ecm. I cant seem to find it. I just dropped a 350 into my 90 camaRO RS AND DIDNT KNOW I HAD TO CAHGE THIS STUFF. I have the injectors, knock sensor, and esc module i need, but cant find a chip!!!!!!!!!!!!!!

dctrumpet

Brian Harris from Harris Performance will have a number of these for you. Go to tbichips.com and his contact information is there.

RBob

There isn't a stock chip for a 5.7l TBI camaro. GM only offered TBI on the L03 5.0l engines in the f-body's. If you replace the stock L03 55#/hr injectors with 61#/hr injectors you are 96% of the way there.

For the other 4% it depends upon which 350 you dropped in. Heads & cams vary among the different 350's and will make a difference on how the SA and fueling should be.

Try it with the injector change and the stock chip and see how it runs. Then if there are any issues that need to be corrected in the tune you can get into DIY tuning or find someone local to take it to.

RBob.

__________________

www.DynamicEFI.com

'92 Camaro in Dark Green Gray Metallic

NewJerseyMI

I didnt convert the engines parts I just pulled one from an older truck and replaced the 305 with the 350. The only thing i had to change was a few minor things. I think it would be cheaper and quiker to do it the way I did it.

cnnbrunson

Hey looney, What was the correct part # for that chip. I cant seem to find it anywhere. I Just did the 305tbi to 350tbi swap in my 90 rs and cant find the part numbers I need. What year caprice should i tell the parts store. This has been a huge headache ,but i hope its worth it

dollarbill425

I did this swap 7 years ago, I dont get a lot of time to work on her but I'm still trying to find the correct part number for the caprice esc, knock sensor and chip as well......mines running rich with 305 ecm knock and esc, with 350 injectors which makes sense.... I miss driving her and need those numbers, I tried the non roller numbers and didnt come up with a for sure answer... If someone can clarify and tell us exactly what part number of esc, and knock sensor please, or am i just a dumba$$ and missed that part??

dollarbill425

I searched autozones website and found part#s for a 91 caprice 5.7l,,,
knock sensor part# SU154 $30.99

ESC part# ESC100 73.99

Will these work for me after I get a chip burned for my 305 ecu?

dctrumpet

where in Missouri?

dctrumpet

Give this a shot. Have you checked these numbers out?

dollarbill425

Central by Fort Leonard Wood 2 hours south west of STL... I tried those numbers on gmpartsdirect and some other websites and kept gettin results for 5.0l engines...those part numbers i posted I finally found from autozone using a 91 caprice

dollarbill425

called chevy, they said part#s 16126761 (5.0L) and 10456287 (4.3L and also used on a 350 corvette) are both knock sensors, I'll try the other two on the bottom of your post thanks

dctrumpet

GM 10456288 is ACDelco 213-324. It was used in 4.3L, 5.7L and a few 7.4L GM vehicles
GM 10456287 is ACDelco 213-325. It was used in 2.3L, 3.0L, 3.8L, 4.1L. 5.0L and 5.7L

these are other OEM numbers for vehicles that had a 350.
KNOCK SENSORS
90-93 Caprice 5.7L Vin 7 GM 10456018 which is ACDelco 213-324 same as the GM 10456288
84-86 vette 5.7L vin 8 GM 10456017 which is ACDelco 213-325 same as the GM 1456287
87-89 camaro/vette 5.7L Vin 8 GM 10456018 which is ACDelco 213-324 same as the GM 10456288

Many of the 5.7L trucks used the above numbers as well. Mostly the 10456018

I am currently running the 10456018. Yes, it was also used in 4.3L vehicles as well, but predominantly the 5.7L. Who knows? LOL. GM is crazy and nothing they did ever made sense.

HOPE THIS HELPS!!!!

I will do the same for the ESC modules!

dollarbill425

thanks a lot man, i'll see if I can find them

cnnbrunson

Thats all the numbers for everything i have. Do you have the number for the chip i need. Can you help with that. I want to get into burning my own chip, but i need this to get me running for now. Please help!!!!!!!!!!!!!! I cant find the part number for the chip I need. Everytime I call chevy they tell me they need the broadcast # for the ecm. I ask for the chip for a 92 Caprice police car.

92Forumla

I just bought a Complete L98 out of a 89 GTA. For $600 it comes with motor,trans,complete harness and ecu? What will I need to make it work? Car is currently a 305 TBI/700R4 '92 Camaro. Off the top of my head I can think of fuel lines, pump, and ESC. What else?

strocker383

hey guy i put a 350 old version with a set of vortec heads .change injector 'ecm'esc 'knock sensor ' and if i push quick on gaz it backfire in the tbi .sounds better if i advance the timing but the motor can't crank no more after ...any idea ????timing is set at 0 ....any idea about a different chip to solved that problem ???

Fastcar92

well i am using my 305 injectors but i THINK IM LOOSING HOSE POWER witout the 350 injectors

strocker383

how can i ritcher up a little .....running 12 lbs pressure gaz ..doesnt seem to be able to raise up more ....

Ozz1967

Please check your spelling and grammar.

It sounds like your timing is off, are you certain you put the distributor in correctly? It's really easy to have it one or two degrees off and that will screw up everything.

strocker383

yes timing is set correctly ...its set at 0 with the wire unplug ....can i raise up the fuel pressure to make it run a little ritcher ..its set at 11 1/2 psi...sounds like its lean ..it does the same thing went u put a little shooter on a holley carb..

Ozz1967

The best way to tell if it's lean is to get a Air/Fuel mixture monitor. That way you can monitor the rich/lean condition while you mess with your mixtures. Also, on my car (84 T/A with a computer controlled carb), I have to run the timing at 9 advanced with the plug unpluged, pulls about 32 degrees or so with it plugged in. Or take it to a shop with a dynometer than can dial it in perfectly for you on the dyno. With any kind of backfire, it's usually a timing issue of some sort. Anyone else know if a too rich/lean condition can cause a backfire? I do know that if you are running really lean it causes your computer/ecm to dump more fuel which can make you think it's running rich.

Tough_Nuts

Hello all, I am new to the board. But I have been reading this thread. WoW lots of information. I have a 2001 F-Body, I am very happy with it.

But I have a 1986 Chevy Silverado K-10 with a 305 carb that I would like to change out to a late model 350 tbi. Can this be done ? And what am I getting myself in to ?

Any advice is welcome.

Thanks,
T_N

ad356

says starters and flexplates are the same for the 305 and 350. not entirely accurate. the 350 that i used had a larger flexplate and i had to use a different starter becuase of that larger flexplate. i used the flexplate that came with my 350. i assumed it needed a larger flexplate becuase it might have more compression, not sure why the difference

Samurai_Of_Dawn

Sorry if this isn't the right place to put this, but I figure this is where I may be able to get my answers.

I have a question. I replaced alot of parts on my car, but currently, it runs kinda poorly. For example, sometimes when I come to a stop, the car would act as if it wants to die on me (it's died on me a few times like that). I can also warm up the car for a little bit, and afterawhile, the car would die (unless I feather the pedal a little bit). That's just the jist of it. I can post more details if need be.

I searched all over for answers, getting advice on what it could be, and so far, I think I narrowed it down, but I'm not 100% sure. As of now, I'm on a tight money budget, and I don't want to carelessly waste money on shooting arrows in the dark in hopes of a miracle cure. I'm trying to source it down and possibly solve my problem.

Here's the situation:

My car is a 87 Iroc Z, and it currently has a 350 in it, laced up with TPI. The car originally had a 305, but swapped it for the above mentioned motor. Here's what I'm starting to question. Durring the swap, the previous owner never swapped the ECM nor the corresponding chip that goes with the 350 into the new swap. I'm pretty much running a 350 on a stock 305 prom chip.


Here's a few questions I'm hoping to get answered.

1. Being that it's been running pretty poorly, could not having the 350 prom along with the proper ECM, and ESC make the car run this sluggish? I read those are required in the engine swap.

2. I know the previous owner replaced the knock sensor, but my question is, how do I identify what kind of knock sensor he might of installed? Is there different numbers, different shape, what should I be looking for?

3. I'm gunning to replace the stock 305 prom with a 350 prom (just to get it out of the way). I've been looking at hypertech and I read on here that alot of people say it's junk. In all honesty, I'm just looking for a stock replacement (not looking for any performance gains, just stock 350). Would I be better off on finding a stock one? Is hypertech even worth looking into? Or, should I just order one off of TPIparts?

When I got the car, the previous owner gave me another prom chip from TPIparts, and when it came down to installing it, it ran like chit. Could it of been that it was a defected chip, or could it of been that I didn't have the proper ESC module and "possibly" incorrect knock sensor? There was a BIG difference on how it idled with that chip. At times, it would crank, but wouldn't start. When it DID start and gave it a test drive, I couldn't even break the 45 MPH barrier. I'm leaning on a defected prom chip.

All help is appreciated. If I have to, I could post specs of the car and what has been changed on there from when the previous owner had it, to present time since I'm the current owner now.

Samurai_Of_Dawn

Does anyone have any suggestions at all? I just wanna get the car back on the road without any problems rather than have it sit and collect dust.

charlielamb

im doing this swap and was wondering if i can use the chip out of a 350 tbi truck? also my car has a manual if that matters

90poc

Hmmmm.......

90poc

i did the 305 to 350 swap

it is a 1990 bird, manual tranny, stock computer #1228746

i had an issue with the idle surging and then it would die. the solution was to adjust the minimum air "aka" idle adjustment screw. i found instructions on this website under "IAC and TPS adjustment"

then it ran ok but i got a code (43 i think) esc or faulty computer. not having any luck with finding a '90 caprice 350 chip. i took a chance and plugged in a computer with prom from a 90 pick-up #1228747. this fixed the service engine light problem but i can definately tell im running a truck program, good lowend power and doesnt make any power above 3000rpm

im now waiting for a shipment of burning equipment from Moates

GMODUDE

Yo i got a 385 fast burn crate motor and ide like to keep my tbi system if possible. The engine now has a dual plane intake manifold for carb. it has a hot cam in it and pushes over 400hp. its goin in my 92 camaro tbi 305.now is there a certain aftermarket manifold i should run or is there a way i can adapt my carb manifold to run tbi? plus where should i look to get new injectors. would i need to change fuel pumps to get the right psi? I am going to take the car to a dyno shop to get the chip made and ecm tuned but i just need to know the parts that would be specifically different being it is pushing 400hp.Ive even heard the stock 305 manifold wont fit on vortec heads....is that true?

NJrFirebird

little reverse here but would a 700r4 tranny from the 350 fit into a 305?

Ozz1967

What was the other type of tranny?

Essentially yes, it'll bolt right up, minimum is a new flywheel and brackets for the kickdown and TV cables.

NJrFirebird

thanks

vampyrico

umm, i know this is a tbi board. but what if i use a carb setup. is the first post different aside from the injectors and everything else it says i need. virtually no electronics are connected to the engine.

JR350tpi

I have L98 engine block and was wondering what would i need to put it in my 91 RS its a 305 tbi right now.

steven hecker

i know that with an adaptor plate i can put the tbi on a pre 85 350, but can you put vortec 350 heads on a pre 85 block?