How important is it to have the engine displacement constant correct on 730? I only have a 355 which puts me to 5.82L, but what about guys with 406s and such?

 

Depends on what your doing with the car and your level of expertise with the code.

For the new guys, you want all the basic info., as correct as possible. Then learn how to tune with things by the book. As you get more and more into things, THEN you can fudge things for a given idea. The 730 and 8D code are a great combo.

When you alter the cyl displacement, and inj constants you making changes the effect EVERY facet of the code. And some of the changes you may not be aware of and might make tuning a real headache.

 

Grumpy, question on your last reply. I'll be starting as a newbie this spring with my tuning. I have decent mods throughout and more happening before I actually get to tune. example. I have a stock l98 w/40k miles, a 9lb P1SC blower, 30# SVO injectors, SLP ported & polished runners, ported and polished upper stock plenum, MSD6AL box and headers. Besides getting a idle and cruising log file where do I start? I mean is there a blatent constant or flag I should change before I begin knowing my mods?

 

By reading <g>
Lots of reading.
Since your running a S/C, I'd imagine you want to run the 58 code. So running thur all the Syclone ecm stuff you can find would be one thing to look for. Then searching thru the archives here on 58, 1227749, and 749.
Then in the Final Answers is Tuning 101.

Then get the .ecu for it and start reading thru it. Lots of the variables are kind self explainatory, and a few not even needed, and then there are some important ones.

Once ya do some reading up on whatever code you want to run then you can get into the particulars. There's a steep learning cure just getting the info..

 

Grumpy, thanks for the advice. I have to ask another question though. I run a 730 stock ecm now, I live in Vermont where emissions don't exist for 11 years and older, BUT, I plan on moving back home in 2 years to CT where emissions are close to being as strict as CA. I'll need my a.i.r. equipment and EGR. If I read correctly the syclone,typhoon ecms don't allow for that equipment? If that is the case where to start, given my current config?

 

I dont know for sure the total purpose of changing this code but seemed like it would be a good idea since you want the code to be as accurate as possible. I didnt find it all that difficult to do it in the 8d code. The simplest way I found to locate locations and figure out the different calculations is to search through the hacs. Although Im not sure at what hacs are available for instance the cyclone hac, but had no problems finding the 8d hacs. Most of the calculations I found for converting the code value to real world values was just deciphering the formula for each value. For instance you could take the code value and divide it into the real world value and get the formula. But then found most times had to multiply the values by the formula value that ends up being a very long decimal value. I thought I would put some insight on how I was able to create my own ecus. Seems to work for me but not sure if this is how its normally done or the easiest way. I know this is a confusing explanation but maybe when i have the time ill put up an example. As grumpy said this is the simplest form of understaing the code as you need to know exactly what changes affect what and requires lots of searches through the archives as well as tons of reading. A good start is to try to understand the binary language and work from there. At that point you wont even need any software to make changes but a simple binary editor. I know everyone here useing the variuos softwares but im that kind of person who wants to know every aspect of something and know exactly what the software is doing to my code with some math and formulas then checking and rechecking to make sure the code is absolutely correct. I know guys on here are creating new codes for different controls in the bins that are non existant and am at the point of triyng to understand myself how this is done. I think this has something to do with the various patches people have written. I personally would like a more indepth explanation or where to look at understanding the structure of the bin files since most of this info is pieced around in various archived posts.

 

I looked at a 5.0L bin, AXXC, and it's injector constant was 4.99 and that is good enough for me to change it.

 

With as close to the stock configuration as possible.
And don't forget a big new cat just before testing, alond with all the other lil details.