Nissan ECU Tuning

midnight · Joined: 17 Feb 2005 Posts: 69 Location: Sydney, Australia

Hey guys, Ive noticed a few aussie on the board so Im asking where everyone gets their eproms from.

I cant seem to find anywhere with 29c256 eproms, and only a few places with 27c128s at 120ns and 27c256s at 100ns

cheers

darkhalf · Posted: Fri Feb 25, 2005 4:21 am Post subject:

try through Altronics distributor (Aztronics in Adelaide) they are about $9 or so for 27C256

i managed to get a whole lot of secondhand ones for about $2.50 but since getting the pocket romulator, i hardly use them

midnight · Joined: 17 Feb 2005 Posts: 69 Location: Sydney, Australia

how fast are they?

Im abit pissed off because I paid extra for a programmer that does 29series and atmel have stopped production and I cant find anywhere that stocks em

ah well...

darkhalf · Posted: Sat Feb 26, 2005 3:07 am Post subject:

about 100-120ns
there was a thread about those flash chips on here, try doing a search on that part #

could try RS or Farnell

Tektrader69 · Joined: 12 Feb 2005 Posts: 17

The ATMEL agents in Australia are MEMEC electronics.

They are in Melb Adelaide and Sydney. If you wanted to buy a tube or two they could help you.

Finding any Eproms faster than 100ns is quite hard.

I have found 100ns actually work quite OK

ST micro 27c's from Arrow electronics are findable but only in 100 ns

midnight · Joined: 17 Feb 2005 Posts: 69 Location: Sydney, Australia

ok thanks, I'll check it out. I also found that Futurlec have 100ns 27c256s for $3.86 Cool

now all Ive got to find is a cheap uv eraser..

sikman69 · Joined: 01 Sep 2004 Posts: 2

I bought my 29c256(90ns) from Futurelec, arrived in a few days. I use a Willem Programmer to right to the chips many times for my nissan Gti-R...DOnt waste money and buy 27c256. item code on the website is at29c256

Hope this helps,
Arthur

midnight · Joined: 17 Feb 2005 Posts: 69 Location: Sydney, Australia

futurelec dont list a speed on their australian site, and the american site says they are 120ns... so I assumed they were 120...
guess not

ill get some from them then... thanks

mattybaby · Joined: 14 Feb 2006 Posts: 3

so whats the deal with the speed of the chip? is 100ns too slow for car ecu's? I heard somewhere that 55ns is best. What is the standard speed?

LMQT · Joined: 06 Aug 2005 Posts: 144 Location: France

Don't take care about speed : access time of up to 200ns is working well, at least in CA18DET's ECU.
I'm using this kind of EPROM every day for my own tests and never had a problem with them Wink

I play with 27128, 27c128, 27256, 27c256 and 27c512 alternatively, regardless of brand and model Wink

Mr Fast · Joined: 16 Nov 2003 Posts: 98

all z32 ecu's i have seen has an 120 ns chip

there is no benefit at all in using a faster eprom, but it need to deliver the data it holds in time, if not the ecu will crach.

everything from 45 to 120 ns is safe, all within this do the job in time.
some clame to have used 200ns eproms without any problems,
im not sure about this but maby a 200ns works ok

Otto

LMQT · Joined: 06 Aug 2005 Posts: 144 Location: France

Mr Fast · Joined: 16 Nov 2003 Posts: 98

LMQT · Joined: 06 Aug 2005 Posts: 144 Location: France

No problem Wink

I believe that the limit is 230ns with our microcontroler no ?
I can't remember where I have read that Confused

darkhalf · Posted: Fri Feb 17, 2006 9:14 am Post subject:

for 4MHz computer ... about 500ns is the cycle i think so <250ns for half cycle

check the crystal / datasheet for cpu/mcu specific to ecu types