16168625 BHAN modifications for TBI to TPI conversion questions>>

[JeepsAndGuns]

And mine seems to run great with it, but I have never tried it without it. So it makes me really curious.

[Six_Shooter]

The only thing that makes sense at this point is the jumper was needed before the bit for CFI/MPFI was found? Still does not explain why mine runs great without the jumper and horrible with...

Sure it does. You've tuned it to run with injector pules w every DRP, instead of with every other. You need to re-tune when the jumper is added, because the injector firing frequency has changed.

[bybyc5]

Thank you all for the input!
I appreciate your patience with me!


I have 2 spare PCM's. One is set up with Craigs G1 and ziff and I have a few chips I got from him as well to play with. That's whats been running my truck for the past 2 years or so.


I think I'll get another G1 and Ziff for the second PCM so I'll have 2 usable PCM's and leave the OEM one alone.


I'll do the memcal jumper in one and not in the other, and go from there. And bypass the resistors in both? Easy enough to solder in a jumper over the resistors, and later snip a set out of one PCM and see what goes?


I am still cloudy on the “ASYNC SHORT BPW OFFSET VS. BPW” Looks Like I leave this set to off for MPFI.


The MPFI definitions XLS is for version 4 TunerPro, and $0E. Try and match up what I can? I am using TunerPro V5.


I am actually a new user to TunerPro, as I have been using TunerCat for years. The file definition for my $e6 did not have Injector offset parameters...so I downloaded TunerPro and donated. It has a lot more parameters to look at.


This is getting good!
I have tuned a couple different cars PCM's and Ecm's. (LT1's and L98- MAF systems) I have a moderately modded LT1 Formula that runs well on the Tweaked 16188051.
I do not know how to decipher code though. I get lost and covered up quick there.


I have never tried to switch injection systems and re-tune the same PCM for the new system.


And no real speed density experience really yet. I can see where a program like “VE Master” would be nice. Found references to an old program that Craig wrote years ago, but can find no downloads for it.
Think it was called VE PHD or something.


I can see I may foul a few plugs to get it running decent enough to drive, data log, and tweak! That's fine.


Again, Thank you all so much for the input...I still have questions, and am digesting what you have given me.


The dead links I run into from old posts is what is frustrating for someone digging up old information.


Thank you,
Keith

[bybyc5]

In searching more I found this thread here http://www.gearhead-efi.com/Fuel-Inj...r-Spread-Sheet and see there is an excel spread sheet for use with TunerPro RT that someone was kind enough to write.

Guess when I get it running, I should get this program (TunerPro RT) as well, and learn how to data log with it, and then modify the VE tables.
Just never have been to excel savy..

I have a snap on live data scanner (Solus) that I use for tuning information, and datamaster for my LT1 stuff, but the TunerPro RT looks like it's well worth the $39.

There is a lot of knowledge here..just have to keep digging and looking...

Thank you,

Keith

[EagleMark]

Your putting it all together fast. Here's a thread on how to use the spreadsheet. It looks long at first. With data in hand it only takes me 5 minutes to redo VE tables from spreadsheet.
http://www.gearhead-efi.com/Fuel-Inj...-data-Tutorial!

[bybyc5]

That is a nice tutorial on the VE tuning, and TunerPro RT.
Thank you for the link!


Now I just have to get far enough along to use it.


Still in process of swapping the intake manifold, and running fuel lines from the high pressure pump I am using.


I had to swap out the TBI accessory brackets for TPI ones that allow room out the front for the throttle body.


And installing an LT1 dual electric fan set up on the radiator.


So it may be a couple weeks or so before I get to turn the key.


It's all fun stuff, just takes some time to get it the way I want.


I will take some pics when finished.


I will keep notes on what works out with the PCM modifications, what was done and all. For future reference.


Again, Thank you all for the help!!


Keith

[bybyc5]

I finally finished the nuts and bolts part of the swap, and began tuning the PCM.


After making the resistor jumper, and memcal jumper in the PCM. Read out a fresh copy of the stock BHAS bin, used the “flag /switch” and under the “general tab” I made those changes described in the “TBI to MPFI ZIP” (Thank you for that!!)
Burned the first chip and tried it. Initial start up was fuel laden, but once lit up, ran rather well. Actually better than expected!


Once started, motor runs fine. No dtc's set. Fuel trims at idle and part throttle good hovering just over and under 128.
Hot idle pulse width's are 1 to 2 ms.


Really impressed with the low rpm improvements, and the seat ofthe pants feel of the increased torque.
It is really fun to drive.


Cranking pulse width's for a brief moment immediately after turning the key to crank, start at 12 ms then drop down. This causes a slight flooding condition.
Warm starts are a little trickier, due to not needing as much fueling.


If I hold the gas pedal ½ way down and crank the motor, it starts good. But I shouldn't need to do that.


Key on, engine off shows IAC at step position 150.


Looking for tables that control cranking AFR, or pulse width's.


Trying to decipher the function of some of these tables is challenging for me. If I better understood the definition, or explanation, I could easier determine which table to modify and how.


I found a nice list of acronym definitions here on gearhead given by EagleMark, which I already understand most all of these, but haven't found a mask parameter definition list...is there such a thing? I see the notes using TunerPro RT, and hitting the fn/key and f-10 key gives a short note about what ever parameter your viewing at that time. But most of these are brief, and some have no notes at all.


Example:
Crank BPW vs Temperature Scalar Table. The “stock” setting is 123.49
What does the 123.49 represent, and how does it effect this table.
I understand what Crank Base Pulse Width, and temperature is, but the rest eludes me. How does the 123.49 effect the Temperature Scalar table, and can I look at this table? Where might it be?


I am going to play with this table today and see what gives. I would like to be able to understand this rather than just move numbers around until it starts right.


A Really BIG THANK YOU!!! to all here for freely giving help to guys like me, learning and doing projects like we love to do.
I know EagleMark, And Six_Shooter, Dave W, JeepsAndGuns, have helped me and I appreciate this.


I have been keeping good notes, and when done (I know there never really done) will compile all and zip it. I don't know if anyone here has a data base to store project notes like these, but if you want it to help the next person going down a similar path, I'll give it to you when done?


Thank you,
Keith


383 TPI almost done.jpg