Sorry to ask this here but the code59 forums a kinda dead and I haven't gotten a response in 5 days.

I'm trying to weigh $8D B_AUJP against code$59. I need to stay CA emissions legal and EGR is kind of a must plus there seem to be some other nice things that I might loose going to $59. Plus having 2 bar tuning resolution sounds better than 3 bar which I'll never take advantage of.

I can't seem to find a complete listing of everything that gets broken going from $8D over to $59. Does anyone know for sure?

I know the B_AUJP isn't ready for public testing but I'd like to plan ahead so I get the right MAP sensor, etc.

Thanks!

 

I dont know if B_AUJP will ever be ready or not, I hope it comes out soon. I dont think $59 controls tcc lockup and doesnt seem to control the fans. The 730 ecm can handle the $59 code just fine with no changes.

I also dont think EGR works with code 59 but it has EGR stuff in the code. Not sure if it can work with TPI style systems.

And if you plan on 20 psi you will need 3 bar. 2 bar is only good to about 15 psi.

 

1 bar = 14.50326 psi so I should be good with a 2 bar, I thought.

I also heard it doesn't support injector constant and a couple other parameters like CPW maybe. Sucks...

 

This can be confusing. The MAP sensor starts from absolute vacuum, which takes up the first bar of it's range. So a 1-bar sensor is used on a N/A engine. It reports from 0 psi to 14.7 psi absolute pressure (14.7 psi being barometric pressure at sea level or so).

So a 2-bar then adds 14.7 psi to the range for 0 psi to 30 psi of absolute pressure. Or up to 14.7 psi of boost.

One thing to remember is that even if an engine goes to 18 psi with a 2-bar MAP sensor. That just means that the ECM won't do any more correction once at and above 14.7 psi of boost. If the tune is OK at 18 psi with the same tune at 14.7 psi, then all is good.

RBob.

 

Gotcha! Thank you!

 

Exactly, if your fueling is where it needs to be at wot, the 2-bar is not a limitation....

 

True, there isnt much difference in fueling for me going from 14 to 18 psi. If you lock fuel at 14 psi and go to 18 psi without correction it will just lean out abit so tune it abit richer at 14 psi and it will be good to go.

 

Ok well I'll go ahead and order a 3 bar MAP and I guess go with $59 for now until B_AUJP is more tangible. I'll also just re-pin my 730 so I can always go back to $8D easily.

Thanks!

 

Its a simple swap of the chip. No rewiring repinning necessary for $59 on 730 ecm. I dont recall any on my car. Only thing to add is a wideband o2 sensor input for the $59 to read. $8D may or may not have this option.

 

If you don't need a 3 bar MAP if over the 2 bar MAP limit, why do you need a 2 bar MAP if over the 1 bar MAP limit? Just a question to think about.

 

Only up to a point. In PE mode (open loop) there is no O2 correction, and fueling is based on a preconfigured lookup table. The idea is to match your injectors ahead of time with your setup, depending on how much fuel is being called for. There is a threshold in which the stock ECM can correct for in closed loop during part throttle, usually five to six percent, so it would be a matter of either upping the injectors some to be able to run some more boost, or upping the fuel pressure itself. Stock LC2's came from the factory with 2-Bar MAP sensors, but this did not subject them to only 15 lbs of boost, even with just the 2-Bar MAP. A 3-Bar would eventually be needed once you exceed the threshold, because by then, the engine would run way too rich at idle and part throttle because of the injectors called for at that level.

 

Just want to clear up a couple things....

$59 does indeed run electric cooling fans, works perfectly on my '7749 using $59 as well as when I had a '7730 in it when I blew up a '7749. :facepalm:

It has TCC logic, I can say for sure the shift light logic works, since that I what I am using, I know that both use the same output pin, on the same ECM (pin is different between '7730 and '7749), and it has been used on many automatics and have never seen lack of TCC brought up.

The resolution differences between 3 and 2 BAR MAPs is very small, less than most people think, besides $59 has a very expanded F29x table that has more resolution than any 2 BAR MAP based code I have seen. Also $59 has the F29x table mapped out all the to 300+ KPA, where as most 2 BAR code I've seen, if not all, only uses a 1 BAR VE table, and then uses multipliers when above 1 BAR, giving less resolution while in boost. Down load $59, and $58, heck download $8F too, and look at the differences in how just the VE tables are, let alone other improvements that have been made with $59.

 

Thank you, that does clear some things up for me.

 

You will need to explain to me how to use them. I cant figure it out, i just turn my fans on with switches

 

What's to figure out? You connect to the proper pin and set the appriate flags/settings in the bin.

All of the needed information is on code59.org.

 

Am I also to understand that with code$59 it will run right off a wideband o2 directly and not require a simulated NB input for normal operation?

I want to replace my NB permenently with a WB sensor...

 

true.

 

Sweet

 

I used it for a while a couple years ago. He was helping me out with some issues on a blown corvette I owned.

I've spent over 8 years tinkering with $58, $60. I realize $59 is "changed" but $8D just always worked better for *me*.

2 cents.

-- Joe

 

I can verify that $59 controls fans and TCC.
I use the EGR output to control my CC too

This year I will se If I can use the TCC output to control something, since I now have a 4L80e trans.

As soon as I'm finished with this winter projects I will be more on code$59 forum.

 

59 has TCC control and fan control.

59 has the code correction for V8 and EGR to work. Now for TBI I am not sure if it works with it.

Also the resolution difference between 2 and 3 bar isn't as much as people make it out to be. The difference works out to be about 0.7 kPA difference between readings on 2 and 3 bar sensors at the same voltages. You think 0.1015 PSI difference is going to make that much difference?

 

There is an injector constant but it is different than 8D. It is the F28 table.

 

We have several Sy/Tys with Code59 running the engine on a 749 ECM while piggy backing a 4l80e GM ECM 16171199 running $OE code to control the Trans while using the 749 to Lock the TCC. So it can be done.

Personlly after doing it this way, I switched to a PCS Trans Controller (or you could use a TCI which the newer units are a rebranded PCS Unit) to control the Trans. Worked better and took me about 15 min to hook up. Took us a couple of days to get the ECM piggy backing to work in 2004 and we still had to use the 749 to lock the TCC.

 

that sounds pretty similar to what i had planned for a 4T60E and boost... use a 16149396 to control all of the tranny related stuff and a 1227727 for $59. i was thinking about using whatever ECM that runs $0D for running a 4T65E as well.