After finishing a run on my truck for 30mins and a scantool connect to the aldl port I noticed the blm fluctuating several points above and below 128. The integrator on the other hand is only fluctuating no more than 6-10 points above or below 128. Why is the blm changing if the integrator is never reaching 0 or 255? I thought it would not swing if the integrator never reaches the extreme limits. I am running datamaster on a pcm 16147060, $85 definition. and stock 350cid tbi. By the way the o2 is swinging between 800 and 200mv. Also my chip is a stock bin.

 

On my SD car, every change of 5 INT = a change of 1 BLM. Therefore your INT will never vary more than 5 from 128 until it causes a change in the BLM.

The INT will only vary more than 5 if you lock the BLM to 128. Then only the INT will vary. The INT is a "finer" indicator than the BLM and I use this for tuning my eprom.

 

so in other words my fuel table is off a bit and the scanner is telling the truth. by the way the datamaster scantool is a great pce of equipment for tuning from what i can see, it shows everything.

also, is this normal for the o2 to fluctuate this much.

 

This statement doesn't seem accurate:
"The INT will only vary more than 5 if you lock the BLM to 128."

I'm still working on my VE tables, my BLM is NOT locked to 128, and I have INTs that very greatly (80 to 143). In one 15 minute Diacom recording file, I have BLMs around 120 with INTs around 140, and also BLMs of 128 with INTs of 80. Once my table is closer to whats really needed, maybe the INTs will very slow enough that the BLMs can compensate and keep the INTs around 128. But there certainly doesn't seem to be anything in the code that says once the INT is more than X (5 in your example) from 128, adjust the BLM.

Maybe I'm missing your point.

Joe
92 Z28 13.3@102

 

Look at the BLM section of the 8D.hac.

When you get near the min max values of the BLM, then you INT can vary from 80 to 160. Also, rapid changes may cause the INT to temporarily to go beyond a difference of 5 from 128, but then the BLM will be adjusted shortly afterwards.

This is one of the reasons I prefer to lock the BLM's min/max to 128 so I just use the INT values because of its better precision and to avoid erroneous temporary values.

 

HOW DO YOU LOCK THE BLM TO 128?

 

You start by turning off your caps lock

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1985 IROC-Z, nuff said :P

 

Prscarf, you set the min and the max BLM to both 128 in the "Constants".

 

Glenn91L98GTA, thanks for the info.
As for IROC-Z_85 reply:
if you cannot supply positive input to the post at hand then keep your mouth shut! your smart a_s remarks are not appreciated.

again thanks Glenn91L98GTA

 

i just check my constants and i don't have a max min blm. i am running tuner cat $85 definition. i even tried to locate on 747 ecn $42 def. with no luck. sorry if i am missing something. i do like the idea of locking the blm and using the int for fuel tuning.

 

Glenn,
I have looked over the 85tpi, 89tpi, 89-92TBI($61), 87-92TBI(747 computer), and 90-92SD TPI Definitions and the SD TPI is the only one that has the min and max BLM settings. Is there any other way to do it?


Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

The BLM Min Max is available in the 4 ecms that I have information on. The $42 has the max/min at address x'D2B9 and x'D2BA; $32 max/min at address x'C5E2 and x'C5E3; and $6E max/min at address x'C4D4 and x'C4D5.

Those are the only ones I have information on (besides SD $8D). So it seems to be available in ALL GM ecms. I just don't have information on all of them. Hopefully, someone will have info on the $85. I am sure it is there.

 

Thanks for the info. Do you leave the BLM's locked at 128 the entire time or just while tuning?

 

I'm ALWAYS tuning.

 

Glenn91L98GTA:
i am not familiar with editing the hex data but looking at the edit function that came with the programmer i would guess this is where you are editing. now say on a $42def on a asdu.bin i see where you are getting the d2b9 address for the min but what to you do with it and what do you change to make 128? the other question is why do they not put this in turner cat if it is in the chip address in the first place, i would think this would make editing alot easier without going to the script and trying to edit there.

 

prscarf,

Download a HexEditor like HexWorkshop. Just do a search on the net for Hex Editor. There are some really nice hex editors out there. Values in the BIN are hex. Hex values have a decimal equivalent. Just bring up the calculator in Windows, place it in scientific mode, and then type in a value. You can then use the radio buttons on the top left to convert the values between hex, dec, oct, and bin.

If TunerCat were to place everything in the TDF to begin with then it would probably take him FOREVER to release it. Furthermore, in the beginning there was a limitation as to how many constants could exist in the TDF.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

P, d128 = x80. Do as Tim suggests and use the Calculator in Windows to convert from one to the other if you are unfamilar with hex.

Tim, TunerCat still has a max Constant limitation (50 now). They informed me that they are working on increasing it in the nowt to distant future.

Also P, not ALL of the variables/constants/tables are necessarily useful in tuning. In fact, some probably shouldn't be touched.

 

Glenn I useing the 6E code and I don't understand what the x'c4d4 and x'c4d5 mean. Wouldn't any information on the bin have to be inbetween 000000 and 003fff. I just dont understand how info at these other adresses end up on my prom??
Thanks for any reply

 

the X'C4D4 and X'C4D5 is the actual physical address. Since the starting address of the eprom is offset by x'C000 (ie. it starts at address x'C000), to find the location within WinBin or TunerCat (or any other BIN Editor), you must subtract the x'C000 offset. Hence, the x'C4D4 is location x'04D4 in the BIN and x'C4D5 is x'04D5.

 

Thanks Glenn I knew it couldn't be as complicated as i was making it out to be.

 

i downloaded hex workshop and loaded my bin file. now what do you do to locate this section of the blm to lock to 128? when using the calculator do you go from decimal to hex, or to bin? sorry for the questions but this is a whole new ball game for me so please bare with me.