Did some googling for the hell of it and found some neat stuff for the SR guys.

http://www.925style.com/edittool_vb.html
This program lets you edit fuel and timing maps and some other variables, but it's in a fairly confusing dialect of Engrish. You guys may have better Engrish interpretation skills than I do, as you're a bit more focused on stuff happening on the other side of the Pacific.

http://www.boostcruising.com/silvia/eprom.asp
Here's a much less confusing write-up on how to make adjustments- I think the program is the same one as on the other page, but I haven't downloaded it to check.

http://www.sr20tuning.com/theoryandpartsrequired.html
Much more detailed write-up on rom tuning.

http://www.engineers.auckland.ac.nz/~lmoo016/
Live romulation (no swapping chips)

Finally, the source of this bounty:
http://www.google.com/search?hl=en&i...=Google+Search
AKA Google+ the first search term that popped into my head, "s13 rom edit"

Hopefully this isn't a double post, but I browse this forum pretty regularly and I haven't seen anything like it posted, so hopefully it will help you guys out.

 

Thanks for the links, I lost them a while ago. They are very helpful

 

dont let chris know.

 

remember, being able to tune is one thing, knowing what you're doing is something completely different.

 

HAHAHAHA

that boost cruising article is SO wrong it hurts!! OMFG. HAHAHAHA!

 

Yup. If you don't know what you're doing, just don't mess with it. Unless you're an electronics whiz, it looks like you'll have to spend about 100 bucks on a daughterboard, 50 bucks on a willem eprom burner on ebay, another 30 bucks on eeproms, and then you have to know how to tune. For all of the effort involved, it's probably something only the diy-or-death type will want to pursue. I happen to be the diy type- I tune my car with rom tuning, but to be able to do so I had to spend dozens of hours reading through 2500 messages on the dsm-ecu list, through hundreds of pages of reference material on my ecu, and I'm still only one or two steps up from n00b status when it comes to interpreting and modifying the code in the ecu. The nissan guys should be thankful this gui exists, in the dsm community all of the editing is still done with winhex I made excel spreadsheets for fuel and timing, those are my gui. Honda guys are lightyears ahead, they have multiple gui's and a large user base, hell, Vertigo on this forum is creator of one of the widely used programs, Uberdata.

 

You didn't even mention the fact that by doing the wrongthing tuning, not only could you ruin your ecu if you screwed it up, but you could also blow your engine.

 

wow, i did not know that.

 

that's up to the source of the info he linked to

 

You can blow your engine with an SAFC. It's a tool, you have to use it properly. Rom tuning just happens to be a much better tool than the SAFC, for less money.

What I'm trying to find now, with much less success, is a cheap datalogger for Nissans. The only dataloggers I've found so far are the standard obd-2 loggers, which aren't really helpful for anybody but s14 ka-t people, and the N-Probe which is freaking expensive at 499. Neat, but really expensive. For DSM's you can get a 40 dollar cable off ebay and use a free logger program to read knock, timing, injector duty cycle, airflow, etc with a 50 dollar palm m100. Couple that with a 50 dollar eprom burner and 20 bucks in chips and a ZIF socket, and you've got cheap tuning. When you're talking 500 dollars just for the logger and 200 for the rom tuning stuff, it makes more sense just to go with a standalone. I'll keep looking for a good cheap logger, but there may not be one until the sr20 thing is a few years old and people start going more DIY with it.