Re: EPROM Programming

["Programmer" <nwester@eidnet.org>]

Just pulled a TPIS chip from a customers' car meself...either
they grossly mis-understood what the customer was doing, or
really just screwed up. Took me 4 hours of reburns to get his
car to run correctly...this was an '87 TPI 355 non-computer
cam, MAF car with 4.11 rear diff. It used to be a 305 car...
Lyndon.
-----Original Message-----
From: Romans, Mark <romans@starstream.net>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: August 4, 2000 10:44 PM
Subject: Re: EPROM Programming


>This is responding to several questions.
>I read a tpis level 5 chip that a friend had. It was for a 88 vet w/manual
>trans.  My friend was very happy with the way his car ran.  I diacomed his
>car and it was pulling out a ton of timing all the time, it was pig rich.
>TPIS had turned off the egr code and not much else.
>I also bought a TPIS level 4 chip.  Couldn't read it, finally took the top
>off and cut all the silicone away and they had cut pin 28.  I have heard
all
>kinds of bad things that cutting pin 28 is supposed to do but the chip ran
>fine, other than it was even richer than the level 5 chip.   The advance
was
>not as radical and the chip actually ran pretty good. But commanding 9.9 to
>one afr at wot is a bit much.
>Bottom line is they are rich and safe.  These are a maf application, maf
>applications are much more forgiving than map app's.
>
>Another question
>BL is used at wot if it adds fuel, if it is taking fuel out,(Below 128)
then
>the bl reverts to 128 at wot.
>
>Another question.
>Thrasher knows what the code does. TPIS uses Master Tune software. I know
>Steve Cole who writes the software at The Turbo Shop.  I have seen the
code.
>In my opinion as well as as far as I know ALL the guys who have spent any
>time doing their own chips, the mass produced chips are not worth the money
>if you can do your own.  Having said that if you can't do your own chips
>what other choice do you have?
>The ecm will pull out timing if detonation is detected.  It puts in back in
>slowly and has to pull out a lot to eliminate it.  THIS SLOWS YOU DOWN!
>The ecm will adapt within x % for out of line fueling.  I want it at 128
and
>to adapt to temp, altitude and other variable's, not to improper tuning.
>
>
>The problem is that this is addicting it's so much fun.  You can always
make
>the next chip a bit better.
>
>Next time you have to rejet a carb or recurve a dist you will feel like a
>brain surgeon operating with a blindfold and a chainsaw!
>Mark
>
>----- Original Message -----
>From: <WEG1192@aol.com>
>To: <gmecm@diy-efi.org>
>Sent: Friday, August 04, 2000 3:59 PM
>Subject: Re: EPROM Programming
>
>
>> Mark and all,
>>
>> I had searched the archive for VSS and apparently Greg Parmer came to the
>> same conclusion I did that the VSS is needed although the "experts" say I
>> don't need one. What I am trying to determine is if the "experts" at
TPIS,
>> Turbocity, and Howell are all wrong. They all say a VSS is not needed
>except
>> for autos. Also, TPIS charges $475 for their level 5 EPROM chip. Are you
>> saying that even at that price they are not that good? For a stock or
>close
>> to stock engine, are you guys just splitting hairs in tuning to the nth
>> degree or are there some significant benefits to retuning a stock memcal
>for
>> a stock motor? Its this kind of knowledge that makes me a cynical man.
>I've
>> gotten to the point where I don't trust my doctor, my lawyer, my
>accountant,
>> etc.
>>
>> I began to question things when I was told by TPIS how to set my fuel
>> pressure on my TPI. They said to run at WOT and measure the voltage on my
>O2
>> sensor. It should be 0.85 volts according to them. Well, I can't get
>there.
>> It pegs at 0.72 volts. But according to Thrasher-EP's site, since the BLM
>> cell 15 is used in WOT calculations for fuel, the ECM is compensating for
>the
>> increased fuel pressure and I will never get there. Their chip supposedly
>> fixes this problem by resetting cell 15 to 128. So are they correct or
are
>> they not? TPIS says no. It's frustrating when the truth depends on who
you
>> ask. Does anyone here agree with Thrasher?
>>
>> Thanks
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