alright i had purchased an entire 3.1 engine/trans/harness/computer out of an 92 camaro with an ecm number of 16198262,from what ive been told it is a 1227730 with a new number..Now ive got a few ?'s about the swap from my maf setup.since i have a complete engine harness with the ecm,can i simply just swap the sensors and harnes/ecm over,without having to repin anything.i know ill have to swap out my mechanical speedo gear for the elcetronic one.
oh i forgot to mention on the chip i have the its labeled aujw

the second ? is with the stock chip how well will it perform with boost,so far ive been told that it cant read boost preasure,it just knows that the engine is under boost or not.but not actual boost preasure

#3 with a stock maf setup /w 350 injectors i could run 10 psi of boost,now i know the maf system would work since it knows the amount of air going into the engine.will a stock SD setup work juts as nice on the stock tune as my maf setup did at low boost levels ?

i know im gonna have to do custom tunning when i throw the 4.3 tt motor in,but i would like to do the swap with the 3.1 i threw in the car just to make sure everything works righ tbefore i go ahead and drop the 4.3 vortec engine in

thnx for any help u guys can give me as im new to the whole ecm swap/tunning

 

1) if you use the EFI harness that came with the 3.1l then it will all go together. There may be some differences in the EFI harness to interior harness connectors.

2) the stock chip/bin will not do anything with the boost. And it doesn't even really know when the engine is in boost. Everything will just max out at 100 KPa, even if the manifold is really at 130 KPa.

3) I don't believe that the stock $88 code will work as well as the MAF code. At least with the MAF code the increase in airflow at low boost is 'seen' by the ECM. With the stock SD code this isn't going to happen.

There is the $58 and $8F code available for 2-bar usage. Both will run in a '7730.

RBob.

 

Nope. The 730 ecm can be connected to the optical style 2000ppm VSS buffer (search this board for how).

 

Normal stock 730 ECM code will not see boost. It will ignore it.

With a MAF setup and a 3.1L, the MAF will be maxed (255 gm/sec) at approx. 9PSI of boost. With a 4.3L, the MAF will be maxed at approx. 1PSI of boost at the RPMs you desire.

In the end, you will be running a MAP setup for the 4.3 Liter. That means the $58, $8F, etc. code, or Megasquirt or other custom ECM.

The 730 ECM will work with either a magnetic or optical VSS (I use an optical VSS).

 

The '730 hardware will support both optical & magnetic VSS's, but the software doesn't always.

RBob.

 

He stated that he won't be using MAF, his new setup is SD.

Dave, the 730 is limited by the 1 Bar MAP sensor. In order to change the MAP sensor and get the computer to read boost, you will need to install the $5D (maybe it's the $808) hack, this will enable the ECM to use a 2 Bar Map and read boost levels up to ~20lbs, give or take a couple for plenum size, etc.

The 1 bar map will only really support about 7-8lbs of boost, but it will switch to PE mode when it maxes out and will just dump xxx amount of fuel in, even if you aren't flooring it, the computer still can't read the vaccuum properly.

With that being said, you could get it to run, but I and most people on here wouldn't suggest it. Others on here have gotten their SDs to run with more than 10lbs of boost, but usually they just keep adjusting the PE mode according to their WB02 readings.

In order to get the $5D/$808 hack to work, you need to make sure that the ECM is a 730.

 

You are talking about multiple ECMs, Code Masks, and even a custom hacked 165 code mask. The the $5D (165ecm) hac would go up to 2bar (15PSI). Not sure where the 20SPI came from.

The 1 bar map will support about 0.3PSI of boost. The $8D switches to PE mode at 93KPA stock and the $58 at about 55KPA stock.

Use the proper MAP sensor and code for the desired boost level.

Use a 165 ECM for the $5D hac. If you want to use it then ask 83 Crossfire TA and JoBy about it. They can give you details. You can download it at the power adder board. Search for it using user "JoBy". Note that the KPA resolution was cut in half for the 2 bar sensor. Also, a GM 2 Bar sensor is not linear so the hac is only an approximation. In the end, use that with the 165 ECM or the GM standard boost code in a 730 or 749 ECM.

One other thing, you wanted to rev those v6s to 6800 RPM at one point. You would be much better off with an ECM that has VE up to about peak RPM. The $58 code goes up to 6400 RPM.

 

OK, i bit off more than i though with this one.lol my head is spinning now.i am holdoing off on the 4.3 tt for now,a few unexpected issues came up with this setup.so im just gonna build up another 3.1.im gonna stick with my maf system for now as ive had an easy time getting it to run right with afpr and an fmu.(holds a steady 11.5-1 afr under boost)
that im really starting to think that going to the 730 ecm isnt worth thetrouble specially when i have an megasquirt and harness sitting next to me.
one of the main reasons i was gonna try to do the swap was to affer a more complete turbo kit to the v6 guys,but most guys arent gonna run more then 7psi anyway,so the stock maf systems wil work just fine for them.though i still need to figure out a base tune for sd guys running under 8 psi,hopefully afpr and fmu will work juts as well on the sd setups as it has on my maf,which once i finish up one of my customers cars ill know for sure.

unless i can hook up with somone here to burn me the new chips for the sd guys,and just supply the new map sensors/injectors with my kits.for the sd guys

 

I meant the $58 code for the 730. This can be done by moving a couple pins.

1 bar is for every atmosphere unit (14.223 psi). So like junkcltr said, a 2 bar can support just shy of 15.

He is right about the 6400 RPM limit in the $58 code.