Hey guys My first post I know this is a old post but im hoping to get a answer I have a 95 K1500 with a 305 tbi want to replace with a 350 tbi. My computer is a BJXL. So can I just put a prom chip in it? I found a prom BYXL for a 95 c1500 with a 350 is this what I need? thanks

 

Byxl is for a 4.3l

 

Thanks for the fast reply they may have it listed wrong on eBay anyway if I find the right prom chip is that all I need or do I need to replace the computer also

 

You just need a memcal from a 427 ecm and one of these bcc.
http://www.gearhead-efi.com/Fuel-Inj...Information-0D

 

This should be a byxn for the 427 ecm 5.7l auto
https://m.ebay.com/itm/GR-3-670-EPRO...QAAOSwY~lZ9jVX

 

Bjlh

https://www.ebay.com/p/Computer-Chip...19135437&rt=nc

 

Thanks for taking your time to help out on that.so according to what you sent me all I need is the prom chip and my computer will work.so the prom chip is kinda like a hard drive for a pc. Thanks

 

All you need is the appropriate memcal. It’s a calibration for the ecm.

 

hi all, new to this site. just purchased a 91 r/s with 305tbi. i'm starting to gather the parts to swap in a 350. i have a 350 roller cam block with a balanced assembly with flat top pistons , and lunati efi cam with 219/227,471/480 lift, on the engine stand. i was looking at a new set of heads from epm machine in oregon. alu castings,vortec 64cc chambers,190runners,202/1.60 valves ,and tbi bolt pattern, for $799 . sound like a good combo ?

 

Did you ever get this figured out? I am having the same problem. Also what part number prom did you go with?

 

@Sonoma92 what are you working on ?
year make model, ecm service number?

 

I purchased a 1990 Camaro rs as a project. It came from factory with a 305tbi and standard transmission. Previous owner swapped in a 350tbi automatic transmission. He did not change anything else. So i am in the process for changing injectors and so forth. However i need a prom chip. I have 8746comp if that helps.

 

The closest calibration for your ecm is atjp or anlu.

 

Thank you i will see i can find one and then see if they will work

 

Would an 87-89 Corvette ESC Module work for my 350 TBI swap? Ive got one of those and I figured it would match ok to my stock L98 knock sensor.

 

Rbob would be the man to ask about your esc.

 

 

Sonoma92 you should talk with Brian aka Tuned Performance about that chip.

 

This might be a dumb question, but will the holly sniper EFI on my 305 fit a 350?

 

yes it will you will have to update the settings .

 

Hey guys, Im in the process of doing the 305-350 swap on my 901 RS. I have the 350 injectors,ESC and Knock sensor. No chip yet. I know if i dont change the chip it will run rich..But im also changing the entire exhaust to headers and NO cat with 3 inch. Also the air filter will be a K&N. will this lean it out enough? If not I need to find a chip.

 

I apologize if this is a repeat dumb question but I'm having a hard time finding a chip for my 1989 305 swapped to a 350 TBI. I found this one at Hypertech (129362 chip) it's for an 1989 Caprice. Their sales staff is useless at answering the followig question. "Will the 129362 chip work in my 1258746 ECM."

Do you know?

Thanks!

 

If you need a atjp lmk. If there chip is $61 mask yes it will work. Can ask if anlu or atjp based

 

https://www.ebay.com/itm/294329279870
Might ask for prom picture

 

Btw a 747 ecm will work with appropriate calpak and prom

 

I apologize but I'm not sure what atjp or anlu means. Are you saying I can buy the Caprice ECM on ebay and plug it into my harness?

 

Atjp and anlu are the letters on top of the chip the broadcast code. The one on eBay might work I’d just verify chip code.

 

Ah, okay. My current chip has ANTS printed on it. What do you mean by calpak?

 

If your staying with a 8746 no need to worry about a calpak but if you go 747 truck ecm there is a v6 and v8 calpak

 

I'd prefer to keep the 746 and just swap the chip if that's possible. The Hypertech part number is 129362 for its 1989 Caprice chip. They're trying to sell me the 5.7 TPI performance chip and I keep telling them it won't work. They know less than I do which is concerning.

So will an ANLU or ATJP based chip from an 1989 Caprice work in my car's 746?

 

Yes. Same ..746 ECM. I have an extra for the "copcar Caprice" by Hypertech


129462.350 TBI "Copcar Caprice"

 

I would assume 89-90 hyper poop 129362 would work it looks to be a police tune.
but afaik the don’t accept returns if incorrect

 

I got a notice on email for this thread. Wow it's still going after all these years.

 

It will. While I do run a custom tuned chip much better suited to my setup I have put the "copcar chip" in before being curious and it ran ok on my car. Pretty much a stockish L98 running TBI.

 

Thanks Bro!

 

What 350 crate engine are you running?

 

It's this one: https://westcoastengines.com/chevy-3...ne/tbi-300-hp/

 

Hi so last year I swapped my 1985 T/A 305 Tpi in to 350 TPI the 350 came from a 1986 k10. With the swap I put a bigger camshaft and a 1985 corvette Prom,350 knock sensor(it cam with the engine),22lb injectors,fuel pressure regulator and 1991 formula 350 ESC MODULE,I put my 305 heads and intake on it. Some how im still having problems with idling I do have a BBK throttle body,I’m using my OEM1985 Trans am ECM Can I have some help and tips please this car means so much to me

 

Corvette prom in the 870 ecm ? Datalog with win aldl ?

 

Yeah I have a 1985 corvette prom inside my stock 1985 Firebird trans am ECM and I’m sorry but what’s win and aldl?

 

You can use winaldl to diagnose and see fuel trims

 

How do I do that?

 

People are saying that the TPI ECU needs to be TUNED because of the bigger cam and engine but I don’t know if I need anything els can some one tell mee

 

A wideband gauge to see afr or rely on narrow band to see fuel trims as suggested above.