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RB20 ECU Addressing Q's

RedDrifter

By RedDrifter,
in Engines & Forced Induction

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RedDrifter Experienced

RedDrifter

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Just trying to find out if there are more than one rev limit addresses in the RB20DET (ECCS). The reason I ask is that I decided to put my rev limiter up to 8200 and it hasn't change at all.

Ive always been under the impression that it was set at 7800 and was found at 7FB4(address line) in the eprom.

Any ideas guys?

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RedDrifter Experienced

RedDrifter

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Well if anyone is interested I did end up finding what the second address is for the rev limiter. Ok address one is 7fb4(and this value is 9C in hex which ends up being 7800rpm) and the second is 7f8b (and his value is 97 in hex which ends up being 7550rpm)

I tested both these values and these seem correct.

Oh would anybody be interested in me posting up some stock binary files for a couple of cars. I have a R32gtr and an R32 gts-t stock bin file plus a few others.

RedDrifter Experienced

RedDrifter

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Firstly you need to get you ecu's eprom removed and a 28pin socket put into its place so you can insert/remove the eprom easily. If you aren't to confident to do this just take it to a tv repair shop and get them to do it for a small cost.

Secondly you need an eprom reader/writer that will allow you to write new eproms. Theres a good one that you can buy on www.batronix.com that uses the pc usb port. Very good as you dont need a power source for it. They give you the software for it too.

Thirdly you need the software that alows you to modify the eproms data so you can change the rev limits/ fuel cuts / fuel maps / timing maps etc. I use the romeditor software which is located at www.925style.com/editor_direct.html. You need to download the address file for you specific car etc.

I'll get my work laptop online later today and I'll post up the bin files of the RB20DET and the RB26DETT with the adress file for the RB20DET which I had to modify to allow for the adjustment of second rev limiter and a few othe minor things.

I'm guessing you have an R32 GTS-t ?

I'll post up URL of a site that is dedicated to the 300ZX Z32 and it has a very in depth explaiation of the ecu. The same basic principals apply to the R32 GTR/GTS-T. I just don't know the url off the top of my head but is bookmarked on the work laptop.

RedDrifter Experienced

RedDrifter

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That zed site is

http://cherrypicker.tripod.com/turboupgrad...0dett/id10.html

The HCR32_256_Rev2.zip is the address file revised for the RB20DET(R32).

The Bnr32.zip is the address file for the R32 GTR.

R32 GTS-T ECCS RB20DETStock.zip is the stock bin file I read from my eeprom and is from a 92 R32 GTS-t type M.

R32 GTR RB26DETT STOCK.zip is the stock bin file for the R32 GTR.

I'll post up some info on how to use romeditor and the basic theory behing the nissan ecu's at a later date when I get the chance.

RedDrifter Experienced

RedDrifter

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Yeah that file @ http://www.boostcruising.com/silvia/romstu...uff/romedit.zip is the same as the one I have. Thanx StraightSix.

I just fixed up my post on the files so you all know what the files are. I didn't explain it too well the first time.

StraightSix Community Regular

StraightSix

Posted
Posted

Something I was wondering about . . . would a good approach be to tune with piggybacks and then transfer that tune to a chip? Or would the fact that the piggybacks can only give you values that are already in the factory chip be too limiting?

Oh and RD would you object if I reposted those files on GTRCanada?

Cheers

Jason

RedDrifter Experienced

RedDrifter

Posted
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Posted

Piggy back computers are really limited to what the ecu can do in the end, well from what I understand anyway. I would say it would be just as easy to start from the ecu chip rather than to transfere from a piggy back.

As for the files thats fine I don't mind at all.

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