Reprogramming Ecu

[benl1981]

No - when I spoke to Mark at Hills motorsport I definately said R33 quite a few times and he seemed convinced he has chipped quite a few..

Maybe they have found a way to chip it.. I guess its only a matter of time before everyone else finds out...

Edited September 5, 2005 by benl1981

[Links]

I don't think it's impossible to re-chip an R33 - there is no reason why it wouldn't work..

Thing is - you need the appropriate software + hardware.. you don't want to screw something and lean your car out while on a dyno.

i've looked into it a bit more - if you want to pull out your ecu - desolder it and put a zif slot in it'd help with the ease.

It isn't neccessarily hard.. i think it's more that you need to know what you are doing..

as long as you know what all the high and low throttle maps.. k value and about 20 other things mean.. than go for it..

i'd be interested to see how well you can tune back the A/F ratio.. one main advantage is that it's legal.. there is no way for you to get defected.. vs a power fc unfortunately isn't..

http://ashspecz.com/ashspec/zem/zem.htm is a commercial chioce..

tuning with a cable in your rom chip clot would be the best way - especially on a dyno.. you could run trace maps and work out what's doing what.. and easily adjust..

anyways.. that's my thoughts..

[Links]

also - check out http://www.sr20forum.com

Edited September 5, 2005 by Links

[Oosh]

R33 maps are in the ecu itself, not on a seperate EEPROM, so you need to install a daughter-board. It's a fair bit of f**king about and no where near as flexible as a PowerFC which arent THAT expensive and nearly everyone knows how to use.

[MarkE]

From memory Oosh, you were trying to get EEPROM writers and such to mod your own some while ago. Guessing you gave up?

Once you have a daughter board in there, and you goto a tuner, or DIY, you could then either do swap & test, like Toshi/Yoshi(?), or if you have an emulator like Dr Drift and such, dyno it, tune it, then burn.

If you can mod it yourself if you have some basic electronical experience or already have a modded R33 ECU seems cost effective.

I've got a modded R33 and loom, but an R32 head UGH!

[Oosh]

Yeah, well my car hasn't been modified much further so there hasn't been the impetus, and when i looked at it properly you really need an emulator to do the job right.

IMHO it's just not a feasible process to:

Dyno -> Change Tune -> Erase Chip* -> Burn Chip --\
^                                                 |
|                                                 |
\------------ Repeat til done <-------------------/

*You really need a special eraser for this, you can leave em in the sun but it's unreliable, or you can keep using freshies at ~$10 a pop.

Which is why, from what i can gather, Sam originally had a generic tune and made the odd tweak here and there.

Once you factor in the equipment costs for an individual it's more economical to go the PowerFC route.

Edit: And you'll STILL need Dyno time, and someone to tune it (unless you're confident with it yourself) who will be unfamiliar with the process, which despite it's benefits is why it'll always be a bit of specialty to certain tuners.

Edited September 6, 2005 by Oosh

[MarkE]

I think you'll find thats incorrect ...

Sure you can do the "burn & test" method, like Toshi.

That "special eraser" stuff is BS. An EEPROM writer costs about $35 to make from a Jaycar kit. EEPROM's are about $5, and are electronically eraseable, unlike EPROM's which need exposure to UV. You would only use EPROM's over EEPROM's if you were suffering some form of mental illness. Apparently it is also possible to use flash based media, however I am unsure how exactly. Possibly some interface between the EEPROM connectors.

When it comes to why the R33 E(E)PROM(?) can only be written once, I have no idea.

Best way is to use an emulator, which allows on-the-fly tuning, which for all intents and purposes is not going to be really any different to the PowerFC tuning. DrDrift and various others are using these emulators AFAIK.

[Duncan]

Mark at Hills uses an emulator to tune it on the Dyno for you, then once it is OK he will burn it down to a chip. In the case of a 33 or 34 that requires a daughterboard on the ECU but he can sort that out for you.

Give him a call for prices, tell him Duncan for Raceworx sent you and he will look after you.

The standard ECU has some advantages over aftermarket ones, like keeping full knock sensor and consult port functionality. We use a retuned standard computer in the race car and it works well. And of course you get to keep factory tuning for cold start, air con, closed loop etc etc etc

[benl1981]

Cool. I have been warned against hills though...>>>???

What happens if you change turbos then are you up for anouther $600??

I guess I'll go and ask him.

[Duncan]

Hey Ben re-retuning the standard computer is no different to retuning any other ECU. If you change something (eg turbos) you might or might not need to retune depending how different the new setup is.

Generally tuners charge for the time they spend on the dyno with your car, although some shops are arrogant enough to charge big flat fees for their alleged magical knowledge even if all they do is start with a old tune that a previous customer paid for

[MarkE]

Nice to know Duncan. haha.

[Links]

Hmmm.. $1015 for a power fc is still looking like a good option.. best choice would be to get the software.. from "somwhere.."..

[MarkE]

Other than paying ~$500 for Datalogit cable and software, is there a means by which you can hook it up to your laptop? Herm.

[lwells]

Hey Ben re-retuning the standard computer is no different to retuning any other ECU. If you change something (eg turbos) you might or might not need to retune depending how different the new setup is. 

Generally tuners charge for the time they spend on the dyno with your car, although some shops are arrogant enough to charge big flat fees for their alleged magical knowledge even if all they do is start with a old tune that a previous customer paid for

<{POST_SNAPBACK}>

Yes, this is a less than wonderful trend in tuning. Witness the accounts of people getting $500 tunes which involve half an hour of tuning. Sure there should be some compensation for the fact the tuner/workshop is responsible for not killing your car... but even still.

[Toshi]

hi i am toshi.

i have made a site about ECU map.

please have a look;

http://users.tpg.com.au/yuna/Skylines.html

[Links]

Toshi - have you been able to reprogram the R33 ecu?

I've been told:

R33 uses a plcc style processor, and not an eprom. And there are also no header pins to install an aftermarket rom board

How are you able to change what is stored on the chip?

[Toshi]

in order to tune R33 on dyno, board is needed, which approximately costs $350-$400 only board.

Tuner makes ECU map on dyno themselves and this data is transfered onto PLCC chip then fitted onto the customers ECU

Other wise use R32 ECU ( need change all map.not only fuel and ignition).

R33 chip is selling at http://www.grid.co.jp/en/prod/prod93.htm.

This is a one time chip.

when remapping ignition timing DIY, make E F colum same as D colum ignition timing. ( also remove speed and boost limitter)

This means about same AFC.

And adjust base ignition timing by crank angle sensor about 2-3 degrees.

There is no need for a fuel map change.

Because when fitting dump pipe and hi flow cat , cat back, air pod , boost 0.8-0.9 bar A/F changes to about 11. (depends on parts performance)

A/F 11 is not rich. HKS kansai drag racer GTR A/F11 for safe and power.

I think rechip is cheaper way ecu tune for std turbo R33 GTS-T.(my map is totally different std map).

If change turbo in the future I recomend power fc for R33.

I think R32 do not need power fc.

If some one having pomping or fuel rich problem please send me PM or yuna@tpg.com.au.

I be able to chack problem by softwear then I will fix it. ( NSW only)

[Links]

How much is it for a rechip..

What software do you use to do the modifications?

i'll probably shoot you an email at some stage for some further details. My car currently has A/F of about 10.5 when under full throttle.. I was under the impression that this was a bit rich.

[Toshi]

Rechipping is R32 $250 R33 $350

Im using rom editor and grid data scan.(with map trace)

A/F meter is INNOVATR widband.

A/F 10.5 is only a bit rich. therefore is not a problem.

http://www.skylinesaustralia.com/forums/in...topic=81438&hl=

His car was fixed by my rechipped ecu.

Edited September 12, 2005 by Toshi

[Links]

Cheers toshi for the info..