Does anyone have the stock TBI maps for a chevy 350?

I'm in the process of converting to EFI, I have a truck ECU and maps.
Would be nice to start with existing marine tuning than changing the truck tuning.

the .bin & .xdf file would really help but i would take the needed stock maps in a excel sheet.

What ECM do you have?

16168625 BDJZ

it has been suggested that i switch to a 1227747 as it would be easier to use for marine application as it had already been used as one from the OEM manufacturers. trying to work out a deal for a trade with someone. my 16168625 (PCM) for their 1227747 (ECM)

Attached are the files i have for the computer that work with tuner pro. I had to change the .xdf to a .txt to upload.

edit: i guess this site will not let me upload the .bin or the .txt

Do you have access to a MEFI ECM?

What fuel pressure are you running?

What size injectors and throttle body?

No I do not, that's why I went with a truck ECM. you can find dozens of them in a junk yard for about $20. They are not water proof so I will be putting in a sealed box. If I could find a good deal on a MEFI i would just use all of that


Stock pressure, 12-15 PSI. I'm gonna use the 1996+ fuel pump as its 155LPH vs the 55LPH. The street car and trucks suffered from pressure drop in the upper RPM range due to the fuel pumps not being able to keep up.

The stock unit off of a chevy 350, injectors are 55LBs. I have milled off the top of the units. put a nice radius on all of the edges and cleaned it up so it "should" flow better than stock

Start


getting a good clean cut off.


removing all the casting flash and hard edges on the injector housing


after taking some hand files to the edges and sand paper

all done.

I have tuned a TB big block chevy with a MEFI 1 and 90 lb injectors. I could dig in that file and see what the BPW was. This particular application ran a higher fuel pressure too.

You would absolutely need to install a wide-band O2 sensor to read the air to fuel ratio. Honestly I'd get the motor running at idle under no load with the stock truck tune and see where you are at. The region at which a marine motor operates is a narrow portion of the the entire BPW / MAP / RPM table as compared to a car or truck. You could start tuning from there. The marine motor almost never sees the high rpm and low kPa sections of the fuel table and again almost never sees the low RPM / high kPa regions.

IMO I would do a high rise intake and a worked over carb inwhich will produce more hp than your plan. Change to a better exhaust as well.

I have done this int the past. Converted a Merc 305 2bl to MPFI. If I were you, I would look into the 7427 / 6396 ECM running the $0D code that came in the 94-95 GM trucks. It was the last and best computer that came in the TBI trucks. There is tons of support for it.

Check out gearhead EFI for lots of tuning info.

I currently have a Merc 350 EFI / TBI engine in my boat. I am getting ready to do a head, cam, intake, and exhaust install. The boat has the MEFI 1 computer in it now. I am thinking about swapping to the 7427 ECM becasue I know this ECM very well and have tuned them for years.

Also the Merc 350 TBI engine came stock with the large bore, big block, TBI and 1/4" pod spacer installed. It also has the milling already done that you are doing.

I do not want a carb. My boat has a Q-Jet on it and I hate it. I'm not a fan of the carb behavior either. Can't do a high rise intake either as i'm Z height limited. i have about 1/2" from the spark arrestor to the the bottom of the deck lid.

I thought the only difference between what I have, the 8625 and the 7427 was the 8625 had the TCM built in, where the truck that had the 7427 also had a TCM.
someone was mentioning that the 8625 wants a speed sensor input where the 7427 doesn't. I believe this can be solve by wiring the parking switch to on. maybe there is a software bit for this, I'll need to look.

already there

why would you take the 7427 over the MEFI? ping me when you do that, I might buy it off of you....

The spacer I was gonna get with the rebuild kit. since i'm running a stock 350 i was under the impression that the small bore throttle bodies would be fine for my application... hopefully that still the case.

The unmodded TBI units should be
5.7L SBC 2x 1-11/16" ~=490 CFM
7.4L BBC 2x 2" ~= 645 CFM

a 350 @55000 @ 0.85 VE =~474 CFM... so I think i'm good...

Only reason I would use the 7427, is becasue I have several and I have Tunerpro and a Motes autoprom to burn chips. I do not have MEFI burn, which is $500.00

I just did a 24X conversion on the 383 in my 94 Blazer which originally had the 7427 in it. Talk about a MAJOR upgrade going to the 0411 LS1 computer. I would need to do MPFI to do it on the boat, but that would be the way to go, then I could use my HPtuners.

I will more than likely buy the MEFI Burn.