Ra12r
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posted January 17, 2005 09:12 AM
ECU revlimit mod
There are several sources that is able to "edit" the rev limit and raise it. This is done by sending in your ECU for the mod. Could someone please explain how this is accomplished?
  
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MadMike
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posted January 17, 2005 10:55 AM
they probably change a resistor, or something like that, but I doubt anyone would tell us exactly or we could do it ourselves.
does anyone know?
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Ra12r
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posted January 17, 2005 07:43 PM
Well, I really don't care about doing it myself. I would like to understand the technical side of how can we make changes to the ECU. Reason being is that if you can change the Revlimit, then you can also change other things........ Plus my understanding of ROM vs RAM is providing some foggyness.
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entropy
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posted January 18, 2005 12:21 AM
go onto suzukihayabusa.org do a search on "ecu mod". They explain generally what is done.
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TurboBlew
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posted January 18, 2005 04:43 AM
Ra.. Ill have some data for you on a bone stock bike in about 10 days..... if my bike dont blow up on the dyno..lol 
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MadMike
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posted January 18, 2005 10:20 PM
good info! thanks.
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Ra12r
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posted January 22, 2005 06:14 AM
Would any of our local "techies" care to chime in........
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canadamaxxer
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posted January 22, 2005 07:45 AM
 Edited By: canadamaxxer on 22 Jan 2005 07:45
check it out: http://www.bikeland.org/board/viewthread.php?FID=13&TID=16055&set_time=
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Ra12r
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posted January 22, 2005 12:51 PM
Canada, it was that thread that caused me to start this thread........smile I have read the stuff on SH, and looked in some other places. Trying to get a better understanding of what is going on with the mod. Just learning,,,,, any teachers?
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canadamaxxer
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posted January 22, 2005 04:40 PM
I suspect that the info might be proprietary. You could ask DaveO, but I wouldn't be surprised to find that he was not willing to devulge the exact method involved. I keep hearing the term "5%" used over and over.....5% rpm increase, fuel is leaned out 5%, etc....there might be a common connection.
Here is the skinny on ROM vs RAM:
RAM is Random Access Memory: data can be stored and removed repeatedly from this storage system.
ROM is read only Memory: Information is burned onto the chip and cannot be rewritten.
EPROM: Electronically Programmable Read Only Memory. A prime example is your odometer chip in your speedo on your 12R. The data can be overwritten, but never erased.
EEPROM: Electronically Erasable Programmable Read Only Memory: This is used by all modern automotive ECU's. It allows a set of values (your callibration data) to be used and slightly modified by the self learning nature of the ECU...while still being safe from being wiped by electromagnetism....and being completely replacable by a fresh set of data using a reprogramming system.
I had originally thought they would reprogram or replace the EEPROM, but I now suspect that these ECU's are too archaic for that method. To me it sounds like a hardware change (like changing a calibrated resistor as an example).
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johnnycheese
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posted January 22, 2005 05:44 PM
it works just tested it on the dyno but we only got 3 pulls because my dyno ate Karl's motor
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canadamaxxer
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posted January 22, 2005 07:10 PM
You're kidding, right???
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entropy
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posted January 24, 2005 12:55 AM
we did a bunch of testing (35 pulls or so) on Sat including adding DaveO's modded ECU. As advertised it extended the rpm from 11.6 to about 12.1 -12.2k rpm :thumbsup: to DaveO!!!
DaveO does his magic by cutting into the ECU and doing something secret. 
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canadamaxxer
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posted January 24, 2005 07:02 AM
Whew!! That Johnnycheese......pulling our legs like that !!!
Entropy: did you notice any gains in HP or torque with the Modded ECU?
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entropy
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posted January 25, 2005 12:24 AM
nope no gains except rpm, but my map has been customized many times and i didn't expect any changes in hp/tq.
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zx23rr
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posted January 25, 2005 02:53 PM
Well that's special. If he does not wish to spread his info, what is the use of this thread. :-(
So if the bike runs to 12.1-12.2 now, it that indicated on the tach? Or on the dyno. If on the dyno, by my calculations, the needle should be approching 12.8-13.0k. If this is the case, share the wealth. :-)
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zx23rr
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posted January 25, 2005 03:04 PM
So 200 clams, hmmm.................................................
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johnnycheese
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posted January 25, 2005 03:32 PM
yep 13 on the tach 12.2 on the dyno it was really hard to not shut the runs down early
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entropy
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posted January 26, 2005 01:58 AM
quote:
Well that's special. If he does not wish to spread his info, what is the use of this thread. :-(
uhhhhh....
"limit up to 12.1-12.2"
what additional info do you want???
step-by-step instructions on how to do the mod yourself??? (with color pix?)
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rac4it
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posted January 26, 2005 07:25 AM
what is the cost and turn around on this? I might send mine out.
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johnnycheese
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posted January 26, 2005 11:58 AM
quote:
what is the cost and turn around on this? I might send mine out.
200.00 about a week but you would have to check with DaveO.
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zx23rr
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posted January 26, 2005 02:16 PM
step-by-step instructions on how to do the mod yourself??? (with color pix?)
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t-rex12r
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posted January 27, 2005 05:45 AM
My ECU should be back at the begining of next week. My bike likes to be shifted real close to the rev limiter, so I figure if I can shift there without worrying about bumping the limiter it is worth it to me, and a few more RPMs is just an added bonus.
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ridgeracer
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posted January 29, 2005 06:40 AM
There are some important differances between RAM and ROM that canada left out. Besides the fact that you can read and write to RAM but only read the ROM (Read Only Memory) the other major difference is that the RAM is 'volatile'. That is it will lose all its information when power is removed. ROMs on the other hand never forget.
The original ROMs, Mask ROMs were physically built at the factory with your data in it. You sent them your data file and them built a chip. Minimum order 10,000 pieces. Of course that was a pain in the ass. If there was a bug in your code you had to toss 10,000 parts.
So they came up with PROM, Programmable Read Only Memory. These were one time programmable parts. You bought them from the factory with the data all set to 1's. Then you put them in a 'burner' and by overvoltaging select parts of the chip you would burn out microscopic fuse links to put data 0's where you wanted them. You could burn these chips as you needed them, but only once.
Of course software developers might end up testing the code a dozen times and have to chuck a $10 chip each time. To solve this they came out with EPROM which is Erasable Programmable Read Only Memory. (Not Electrically Programmable as canada called it. all PROMs are electrically programmable.)
These proms have little windows in them and can be erased by exposing the window to UV light for about 10 minutes. Then you can reburn them. A great improvement, but you still had to remove the chip from the board to 'burn' or erase it.
Then came EEPROM, Electrically Eraseable PROM. These devices can be erased and written to while in circuit (installed ) These are also called FLASH memory. This is really a misnomer as they are really slow compared to RAM. But , like all PROMs, they never forget.
This brings us back to the ECU. They will have an EEPROM which means the boards were built and then programmed. Let me say that again. The ECUs are fully constructed and then programmed. It is very likely there is a programming port somewhere on the ECU. This would give them the ability to reprogram the ECU if they found any errors in the code or map or if they had to change the engine after production without having to scrap the ECU.
I would bet money you can program it through the diagnostic plug. Pins 15 and 16 of the ECU are connected to the diagnostic plug and are labled in the manual as Input Signal to Memory. Many of the other diagnostic plug wires are labled 'Unused' yet they bothered to run the wires from the ECU to the plug. You should be able to plug the ECU into a PC and remapit just like a power commander.
Here is all you have to do.......
Take apart your ECU.
Identify the mfg and part number of the CPU and Memory chips
Go to the the mfg site and pull the Technical Data Sheet for the chips.
Use this information to read the entire code out of the memory.
Use the data sheet to reverse engineer the code to figure out where the map is and the specifics of the programming port.
Build PC interface hardware
Write PC programming software.
BTW. The hot shit ZX10r of non-volatile memorys these days is FRAM or oil filter memory (just kidding)
Actually FRAM is Ferroelectric Random Access Memory. This has the speed of RAM but the non-volatility of ROM. Look for at a store near you soon.
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canadamaxxer
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posted January 29, 2005 07:37 AM
Thanks for the corrections....I guess my info is a little fuzzier than I thought 
Great infor BTW!! I had never even heard of FRAM.
If all of the modified ECU's are the same (and could therefore be programmed through software changes), why do it appear that every ECU has to be split open for the modification? Also why is it that they can only get 5% increase? If you change the calibration of an ECU, you can modify literally every parameter.
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