This might be best for the Electronics threads but I just want to ask you guy's any way.... How do you do make your own custom chip? What parts do you need? I seriously want to know... Thanks

There is a good intro acticle on this at the "DIY PROM" board.

A better question would be what do we need for OUR TBIs and OUR ECMs. For some reason, the 8746 is a big turn off for the guys over at that board, and they will try to sway you to go to a 7747. Anyways, from what I've learned, forget about Winbin, as there is no .ecu file for our ecm. Without that, it makes that program useless for us. You can "hack" into the program, but if you're like me, it's over your head(and I'm a computer major in my senior year!). Most everybody with TBI seems to go with the $61 Tunercat. Try a search over at the DIY PROM board under "8746"- JPrevost has some good posts worth looking into.

I'm very close to finishing an ecu file that I like. I'm still not a fan of winbin but for being free it's a LOT better than TC in that respect. When I do finish it I hope to somehow write up a program that'll use winaldl to datalog and spit out a new bin file for you to burn and try.
The program will basically look at the BLMs and adjust the VE tables. Then it'll look at your knock counts and what area they occured to make adjustments in timing. Maybe I'll have it take out 2 degrees if there is knock and add 1 in ever cell that doesn't have any. Might take a while to adjust for a big motor but I've found that if you take the recommended Mechanical dissy settings and work it out in excel you can get a good starting point for the main SA table. This is how I finally got my car to stop backfiring through the TB every once in a while (not enough timing coming in soon enough).

JP,

I am very new to this prom burning idea. So what in laymans terms will all of what you are working on do for a daily driver?

All you need to do is push a few buttons and drive around while the program spits out a new "better" eprom to use. It'll probably take a couple hours of driving around but you'll end up with an eprom that'll only need some fine adjustments, no more guessing with the fuel curve. You'll only have to adjust things like WOT spark advance, pump shot, and some constants that you want (TCC lockup settings, closed loop, EGR enable/disable, etc). The hardest part is getting the fuel to be dead on because once you mess with the timing the fuel curve also changes.
It's a work in progress, I just have to see how much time I'll have during the school year.

www.tbichips.com

WINALDL is the best method of getting the data for you or anyone else to burn the chip. Without hard data on any engine with more than the typical headers and TBI mods its just a guess as to what will make your engine run right. If Jon's WINBIN/WINALDL combination works that would be an incredible feat and take a lot of guess work out for the newbie programmer. I don't want to even count the number of chips that I have run through my ECM. Final product has been a sweet running TBI setup but a lot of work.

But I do not recommend a "custom" chip from fastchips.com or any other chips.com for modifications deeper than the valve cover unless you are going to provide them some WINALDL data. I understand not wanting to pay the $150 for the prom burner just to burn a chip for your car but the WINALDL datalogger will be a valuable tool the entire time you own your car. Not only after a modification has been done but to diagnose all kinds of sensor issues.

How is this project comming? I'm VERY interested.

I started it with fortran since it's the language I'm most familiar with (engineering student). Right now I'm working on how to "smooth" out the table if you don't get any data in a cell like 2400rpm 70kpa. I really don't know what I should do. I might just take the surrounding VE of the cells and have them averaged.
The good news is that Joby was nice enough to trust me with source code of winaldl. This way I can have it so everytime you stop datalogging my program is run and the new bin is all ready for a reburn (fuel all done).
Like I said, I've got a LOT of school work on my plate and our formula SAE team is looking to be national champs this year so....I'll only be able to work on this a few hours each weekend.
I'm not going to make any promisses but I think it'll be out around March.

Thanks for the update. I don't mean to rush you but it looks like a good project and I'm interested.

Keep up the coding and let us know how it goes.


Bill:hail:

I have one question, im gona start to burn my own chips
I already have ALDL with a lap top and all the jazz
I have money saved up for the programmer and Tunercat but i dont know which programmer to buy or which one i need
I was looking at these is this all I need?

http://www.futurlec.com/EPROMProg.shtml


http://www.ustr.net/epromer5/index.shtml
Thanx

What ecm do you have? You might not need TunerCat. I'm working on a LOT of ecu files for winbin (freeware tuning software). If you're crossfire of TBI, get either the 7747 or the 8746 ecm, don't use the stock computer if you want to get the most out of your mods. Stock computer is good enough for a stock motor but the 7747 and 8746 have been hacked to source code so going with them would allow more to be adjusted.
If TPI, I'd go with the 7730 ecm.

Jon hate to bother you because my school is killing me too, but did you ever finish that 8746 ecu file? Ive been checking the incoming folder and havnt seen anything. Too bad you didnt write that program in c++, I coulda given you a hand being a gay Computer Science major and all

I have the 8746
Which programmer would be the best and cheapest?

Check out ftp://ftp.diy-efi.org/incoming
Look for 8746jonprevost.ecu
It's probably what you're looking for.

I have the same question anyone have any programer recomendations for the 8746 ecu?

Thanks
Ryan