chipped ecu

[tougejunkie]

i have a top secret ecu for my rb20.. and i heard it might be tuned to run at 100 octane, someone told me anytime top secret tunes an ecu they set it for the premium gas in japan, being 100.. i have accses to 100 but its very expensive and only one loctaion.. if i run 91 how much risk is there of detenation?? can i get the ecu re chipped to run at 91?? should i even worry??:ugh:

[statik]

Don't run an ecu if you don't know what its tuned for. I think top secret encodes their rom's in a matter no one has bothered to figure out, so you may be SOL. If you want to try it make sure you're running a wideband, and you should data log the consult port to check timing under load.

[stinky_180]

most tuner shops "encrypt" or "code" their rom images a certain way so that people can't copy their work. i would recommend sending your ecu out to someone else and having them program the ecu accordingly to your motor specs. or, you can run the stock ecu.

[johngriff]

IF, they "encoded them secretly" they just wouldn't work.

The rom is just memory, storing a bin file, and it has to be compatible with the adr of the ecu, if its not, that would mean they have also have a WHOLE other adr system on the daughter board, that translates that bin data to another format.

Seems a little heavy for me. Most of the "MAGIC JDM ROM TUNE" ecu's i've seen, have hot glue smothered all over the EEPROM so you cant pull it out.

I have also never tried to RIP one of these chips, so you guys might be right, but it seems that simply "encrypting" the data on an eeprom is impossible without other major mods to the board.

My answer to the OP would be this:

Run low low boost to compensate for the very advanced timing in the tune, it seems that most JDM tuned ecu's have a LOT of timing, and very rich. Which is consistent with the 100 octane rumor everyone spreads.

What will do you better is simply using a different tune.

[stinky_180]

im into rom tuning myself and i have talked to a few people with already tuned ECUs from big companys, namely JWT. This is a little off topic but...

The KA24E ecu has a removable EPROM chip unlike the KADE and some of the SR20. Some of the guys that are running the JWT KA24E tune, they've removed the eprom chip and try to read it using their reader/burner, mostly using williems enhanced. When they load up rom image and adress file, the image doesn't recognize properly.

if you want to do it yourself you can do the following:
get a 27sf512 eprom
find and burn the stock RB20DET image onto the rom
plug rom in and your good to go

[johngriff]

if thats the case, how does the ecu decode the binary on that jwt ecu? Like i said, if the adr is different, it would have to have new address protocol.


Weird....

[statik]

if thats the case, how does the ecu decode the binary on that jwt ecu? Like i said, if the adr is different, it would have to have new address protocol.


Weird....

agreed, i find that hard to believe, however the most common method for encoding a rom is actually in the daughterboard. The ECU expects the rom in straight order, no encoding, no encryption. However, if you burn the rom in a unique way, and modify the daughterboard to read the rom and pass it to the ECU in the correct manner, it acts like an encryption/decryption. You have to know HOW to read the rom (i.e. look at the way the board "decrypts" it).

[stinky_180]

i haven't gotten a hold of any major tuner shop ecus so i can't say for certain. but i would also second that having a daughter board would also help the ecu decode the the encoded rom image such that the ecu can properly perform its various operations.

but like i said to the op, since the rb20det ecu is 8bit, you can definately burn your own chip and have your car running with stock ecu code.

[smelly240]

read it with consult - duhr - that give you the bin as the ecu sees it -

the jwt and boards like it have different hardware prior to the ecu seeing the data - therefore, the data can be different there. When you get it from the consult port you are getting it from the ecu's data strem - so it should work fine. people have done this with a few roms - including mines and some other "jdm cool" ones. They arent anything special tho - see if u can just get it retuned.

use datascan or calumsult or nistune or srtalk - and dump the shit to ur HDD.