New to Proms
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Member
Joined: Jul 2000
Posts: 179
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From: Lake Oswego, OR, USA
New to Proms
Whats up, I'm starting to get my stuff to let me burn proms... I just got my tunercat software and tdf file. The question is, what should be the first things i modify in the prom with the car/mods in my signiture... any opinios/facts appreciated. Thanks
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1991 Z28 305 5spd 1LE, TES headers, dual cats, 3 Chamber flowmaster, Comp cams .488/.495 212/218 the usual street racer with a stock chip.
Gained 20HP by porting and polishing my EGR passage.
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1991 Z28 305 5spd 1LE, TES headers, dual cats, 3 Chamber flowmaster, Comp cams .488/.495 212/218 the usual street racer with a stock chip.
Gained 20HP by porting and polishing my EGR passage.
Supreme Member
Joined: Jul 1999
Posts: 2,844
Likes: 4
From: Maryland
Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
I would suggest following the guidelines as outlined in the tech article. I've cut and pasted a SMALL portion of that article here .....
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
<font face="Verdana, Arial" size="2">Inevitably, once an individual understands this article and understands how to use all of their new PROM equipment, the following type of question is posted to the PROM message board or the GMECM mailing list...
Question: What do I modify in the BIN for my F-Body 1991 350 TPI that has 24lb injectors, 58mm TB, TPIS MiniRam intake, AFR195cc heads, LPE 219/219 camshaft, SLP 1-3/4" headers, catback exhaust, 180º thermostat, 4.10 gears, 2400 stall converter, and a shift kit!?!!???
Answer: If only it were that simple. In my experience a newbie PROM programmer wants to immediately jump in and make the 'perfect' chip for their setup. But, it is not that easy ... not even close. This new chip may take you months to get correct. Although you can program a new PROM in a matter of a couple of minutes, it takes significantly longer to develop that BIN so that it will work with your new setup. Again we arrive at my previous comments in the 'How you do it...' section of this article.
</font>
Question: What do I modify in the BIN for my F-Body 1991 350 TPI that has 24lb injectors, 58mm TB, TPIS MiniRam intake, AFR195cc heads, LPE 219/219 camshaft, SLP 1-3/4" headers, catback exhaust, 180º thermostat, 4.10 gears, 2400 stall converter, and a shift kit!?!!???
Answer: If only it were that simple. In my experience a newbie PROM programmer wants to immediately jump in and make the 'perfect' chip for their setup. But, it is not that easy ... not even close. This new chip may take you months to get correct. Although you can program a new PROM in a matter of a couple of minutes, it takes significantly longer to develop that BIN so that it will work with your new setup. Again we arrive at my previous comments in the 'How you do it...' section of this article.
</font>
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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
TGO Supporter
Joined: Jul 1999
Posts: 10,907
Likes: 5
From: The Bone Yard
Car: Death Mobile
Engine: 666 c.i.
A lot of people have differing opinions on where to start first. Generally, people try some small things like fans, locking of the TCC, etc; but for "tuning" you really have to hit the VE tables and the Spark Tables.
My first suggestion is "do one thing at a time". Don't make wholesale changes to the VE tables, Spark tables and PE enrichment all at once and at the same time. Do a little bit at a time and monitor your results.
Second, read all the old posts on this board. A lot of the "where do I start" questions have already been addressed.
Third, take your time, be patient and be methodical. You will be able to quanify your changes easier.
As for tuning, I prefer VE tables first, Spark Tables, re-tune the VE tables (spark changes the mixture) and THEN work on your PE (WOT) tables. Do not start on PE first as you do not have a good starting point; you are making WOT changes based on a probably inaccurate VE table.
The more time you spend on a GOOD VE table, the better your base point will be and the better your PE table will be when you are ready for that.
Tim wrote an excellent post on this board on "P730 Tuning the VE table". Search for it and read it. Tons of good info in there.
Lastly, after you have tuned your VE table, do re-visit occasionally. I found temperature at the MAT had a pronounced effect on it. With a good VE table, I was able to determine how off my MAT Inverse Look Up table was and able to make good corrections to it.
It sounds overwhelming, but it isn't. I make it "an adventure" and have a lot of fun doing it. With a methodical approach, I have observed a lot of things happening in the ecm that not only gave me a better understanding of what exactly is happening in the ecm, but also gave me ideas for machine code changes to the actual instruction set to make the ecm work as I prefer instead of how GM prefered.
To gather all this information, I just hook up my Diacom to my ecm, take some nice long drives to visit friends and family while capturing a ton of great info. I then use this information for further "fine tuning" of my VE tables and spark tables.
Again, read the "P730 Tuning your VE tables" post that Tim made a month or two ago. There is a lot of information on how to do this.
My first suggestion is "do one thing at a time". Don't make wholesale changes to the VE tables, Spark tables and PE enrichment all at once and at the same time. Do a little bit at a time and monitor your results.
Second, read all the old posts on this board. A lot of the "where do I start" questions have already been addressed.
Third, take your time, be patient and be methodical. You will be able to quanify your changes easier.
As for tuning, I prefer VE tables first, Spark Tables, re-tune the VE tables (spark changes the mixture) and THEN work on your PE (WOT) tables. Do not start on PE first as you do not have a good starting point; you are making WOT changes based on a probably inaccurate VE table.
The more time you spend on a GOOD VE table, the better your base point will be and the better your PE table will be when you are ready for that.
Tim wrote an excellent post on this board on "P730 Tuning the VE table". Search for it and read it. Tons of good info in there.
Lastly, after you have tuned your VE table, do re-visit occasionally. I found temperature at the MAT had a pronounced effect on it. With a good VE table, I was able to determine how off my MAT Inverse Look Up table was and able to make good corrections to it.
It sounds overwhelming, but it isn't. I make it "an adventure" and have a lot of fun doing it. With a methodical approach, I have observed a lot of things happening in the ecm that not only gave me a better understanding of what exactly is happening in the ecm, but also gave me ideas for machine code changes to the actual instruction set to make the ecm work as I prefer instead of how GM prefered.
To gather all this information, I just hook up my Diacom to my ecm, take some nice long drives to visit friends and family while capturing a ton of great info. I then use this information for further "fine tuning" of my VE tables and spark tables.
Again, read the "P730 Tuning your VE tables" post that Tim made a month or two ago. There is a lot of information on how to do this.
Thread Starter
Member
Joined: Jul 2000
Posts: 179
Likes: 0
From: Lake Oswego, OR, USA
Can somebody find that string for me "P730 Tuning the VE table"
------------------
1991 Z28 305 5spd 1LE, TES headers, dual cats, 3 Chamber flowmaster, Comp cams .488/.495 212/218 the usual street racer with a stock chip.
Gained 20HP by porting and polishing my EGR passage.
------------------
1991 Z28 305 5spd 1LE, TES headers, dual cats, 3 Chamber flowmaster, Comp cams .488/.495 212/218 the usual street racer with a stock chip.
Gained 20HP by porting and polishing my EGR passage.
<font face="Verdana, Arial" size="2">Can somebody find that string for me "P730 Tuning the VE table"</font>
https://www.thirdgen.org/cgi-bin/mes...tro&default=10
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