Re: EPROM Programming

[romans@starstream.net (Romans, Mark)]

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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