Jeep 7747 Conversion

[crash8212]

If you're buying/making the datalogging cable, you can use an Ostrich 2.0, along with the datalogging cable, to have real time emulation. You can then use a BURN2 to program an EPROM when you're happy with the tune, or you can use the Ostrich as a permanent replacement for the EPROM.

The APU1, has the EPROM Emulator, datalogging cable and programmer all built into one device. The one nice that that the APU1 has that going the seperates route doesn't is the 3 extra channels that can be datalogged.

Thanks Six_Shooter, I may go the way of the Ostrich first to see if this is something I can wrap my mind around and be able to disable a few things (more below). I just "made" the USB ALDL cable with the board that RobertISaar posted the link for. It works although not flawlessly, I may have some tweaking to do in the settings as it does have partial data loss at times. But wow was that simple to set up, MUCH easier than the serial cable and actually cheaper than buying a serial cable to chop up. I ordered 2 boards (1 to mount permanent so all I need is the laptop and another to be able to use on other vehicles should the need arise). I will post a pic or two and a small write up, it really is that simple, and the few things I had to do to make it communicate.

Now that I have been able to log a little on-the-road data I am in need of a little assistance in interpreting it if anyone cares to help. The setup is a 91' 4.3L 700r4 (ECM 1227747) transplanted into a 93 Jeep Wrangler with stock lower (.030+ bore), edelbrock 2114 intake, 2000' Vortec heads, Edelbrock headers, true dual exhaust and no EGR. It falls on its face at half throttle and according to the data it is running VERY lean. All the data says it is lean but the exhaust smells of raw fuel. Could this simply be a faulty O2? I switched from 4.3L to 5.7L injectors last summer before being able to read data and it made a difference but not dramatic. My injector duty cycle is reading at minimum 51% and up to 150% at times in order to compensate. My main question to anyone that can look is that is this truly an issue of too little fuel (either low pressure or insufficient injector size) or the lack of EGR because the ECM still believes it is there. I am also getting a VSS error, could this cause a problem?

New to this data logging thing and I want to learn but I am little overwhelmed by all problems it seems I have.

Thanks to everyone in advance.

[EagleMark]

I'll look at it in AM but 5.7L injecotrs on a 4.3L engine... and your lean? I think you flooded your O2 and it is trying to lean, but injector duty cycle is way off too?

What is your fuel pressure?

Wait, did you do the "BPW **Read Me Hack ** " before the data log? If not your injector duty cycle is Prom ID...

[EagleMark]

OK, first you've got so many error codes going that I wouldn't want to use any of that data so got to clear codes, turn things off you don't have etc... without VSS there will be 700R4 issues to deal with.

You do not have the BPW Hack done to bin so data will show it so ignore that.

Data logs should always be started warmed up as you did but also closed loop for good data, unless your good with a spreadsheet and take that data out.

Your throttle blades are open to far, your TPS voltage should be closer to .54 volts, your at .76 and also no IAC counts at idle.

Your BLMs are all over the place, very lean at idle, voltage is a little low and does not come up even when revved to 2000 RPM? I'd be looking at fuel pressure issues, so check charging system, if OK I would look at grounds, since it's a conversion I'm guessing your fuel pump is grounded to frame and probably not a good ground strap to engine block from frame.

[PJG1173]

[QUOTE=EagleMark;10603]I'll look at it in AM but 5.7L injecotrs on a 4.3L engine... and your lean? [QUOTE]

Yes, when I first put the 5.7's in my 4.3 I set the flow rate at 61# and was globally lean at 13psi. I had to lower the flow rate to 58# to get it to richen up.

[EagleMark]

He does not have that option in a 1227747. Just BPW. I just looked and 5.7L BPW is 135. 4.3L BPW is 181 !

Not sure what I would do there? Bore and stroke are about the same right? Just missing a couple cylinders? There's so many other fuel paremeters based off this... Think I would use 5.7L bin and set cylinder to 6, copy over 4.3L spark and fuel tables to start, but with the big change in injector VE gonna need a lot of work and with Vortec Head Spark Table is going to need work, maybe rough in a Vortec head bin spark table to start then you'd be way closer to work on the fuel VE.

I just did something simalar, since 1227747 never came with 7.4L and a 700R4 I took a 5.7L 700R4 bin and copied in all the 7.4L engine paremeters. So basically made a stock GM 7.4L engine and 700R4 tranny bin. Took about an hour but guy said it runs great and just needs some tweaking because of the 7.4L engine mods. He was about ready to give up after paying a mail order chip company $250 and several logs and new chips to get no where...

[PJG1173]

bore and stroke on the 4.3 are exactly the same as a 5.7. when using the TBI SA tables on the vortec heads with the 4.3 injectors at stock FP i was globally rich. once I went to a LT1 spark table it started leaning out for me to the point I had to bump up FP to keep up. Then I crossed 80% duty cycle so I switched to 5.7 injectors at stock fuel pressure.

Crash does this have a stock vortec cam or tbi cam? I have a SA table I copied from a 2000 4.3 somewhere on my computer. I'll post it once I find it. that might be a better starting point for you.

here are a couple things I experimented with. first is a screen shot of the 2000 SA table from efilive. second is a spread sheet I used to format it like the SA table in the mask I'm using.

EagleMark, looks like the site does not accept office 2010 document extensions. I had to convert the spreadsheet to office 2007 in order to post it.

[crash8212]

EagleMark,
The fuel pressure runs at around 12psi and will drop to around 9 psi under heavy throttle. There is a good ground present so I doubt power is an issue, although the fuel pump may be a little weak as it has 130k on it (didn't replace it...yet).

PJG1173,
The cam is the stock 91 TBI. Everything is stock other than the heads, intake, headers and injectors.

Factory hp rating for the 91 TBI was around 135, 2000 was around 195hp, other than the cam 190-ish should be close to the rating of this engine which is why I originally believed the injectors were too small.

I am still VERY new to the tuning terminology so this is taking me a few minutes to decipher. I thought this might be a simple issue of turning off the EGR and VSS but now it seems I may be in a little over my head for a first time tuning endeavor. I understand about 99% of what all of you are discussing and suggesting but nearly 100% ignorant on how to go about merging bins, editing VE and SA tables for Vortec heads and such.

I have no idea what the BPW READ ME HACK is


I have 3-4 options at this point and I am trying to make the most cost and time effective judgement.
1 - Call up TBICHIPS.com and have a chip burnt with my specs (I think thats a long shot, but the owner seems to think its not, I am entirely skeptical)

2 - Attempt to learn this myself and buy an Ostrich to tinker a bit until I am sure I can do it then a burner to finalize and nag the heck out of the forum members through it all

3 - I learned today that a friend knows one of the GM engineers that helped originally pioneer the FI system for GM and knows EVERYTHING there is to know about them (according to friend) and he lives less than a mile from me and he still enjoys setting up OBD1 and OBD2 FI systems for his own and his friends race cars (8.0 second Camaros). Will try to pick his brain this weekend if he cares to meet me

4 - Carb and HEI (aka giving up, last resort)

[EagleMark]

EagleMark, looks like the site does not accept office 2010 document extensions. I had to convert the spreadsheet to office 2007 in order to post it.

Tell me the extension and file size needed and I'll fix it.