Not all stock ECR33 ECUs are the same

[TomR33]

There is the comparison between 2 stock R33 GTST fuel maps. One is my 95 model and the other is unknown but stock (probably 94 model). Ignition maps are the same.

Tom

[TomR33]

low octane fuel map comparison

[meggala]

what soft ware are you using to view the maps ?

[TomR33]

Once downloaded i used Rom Editor 1.98.45 to view the maps.

[Grim]

interesting....

[meggala]

morning grim

[Guest INASNT]

The 95 ecu seem to be the best one around, doesent run so rich once on boost!

[Jay95R33]

Thanks Tom,

I knew that they were different cause I felt a change when I went from my 95 ECU (now blown up ) to a 93 ECU.

BUT NO ONE BELIEVED ME !!!

Thanks for posting up some hard evidence

BTW: Do you have the factory maps for the R33 GTS-t in BIN form, or what ever form they need to be to load them up in a Eprom?

I'll see if I can load the stock R33 maps into a Eprom and socket that R32 ECU I have.....

I should've asked you when I saw you last weekend.

Good work.

Jayson

[TomR33]

Jay,

I have tried loading the stock R33 ROM data onto an EPROM and use it on R32 ECU. It doesn't work. The K constant is much larger and TP scale is different. R33 ECU must have a different algorithm to calculate the injector pulse time.

Tom

[whatsisname]

J,

I thought it, you posted it Oh yeah, I was with you on this from the start mate!

More evidence to add to the, '95's are better' line of thinking..... Bugalugs ran his stock ECU'd 95 GTS25t to a 13.4 @ near on 107mph at a private drag day last month. His car has a 3" exhaust off the turbo, pod filter, upped boost (12-13 or so psi) & FMIC. Nothing else! It also made 204rwkw at a dyno day last yr. 2 other GTS25t's on the same drag day (not 95's) had more mod's, including a Power FC & Microtech LT12. Bugalugs' car was equal to the LT12 car & faster then the PFC car! Both in ET & TS, & regardless of 60' times.

[predator]

Makes sense, and in line with what a lot of people have suspected for a while. For it to be empiracally proven, you probably need to get multiple 94/93 ECU's and 95+ ECU's and load them in and see whether it holds the same.

Here in melb a lot of R33's on dyno days and the like can produce some quite high figures (around 170rwkw) and still are running the stock cooler and stock computer... and some of the 93/94 guys (mine is a 94), even with a fair few more mods, only get 180-190rwkw. The ECU difference can account for some 10-20rwkw it seems.

[Jay95R33]

OMG - I bet he was happy !!!

Now the next step is to identify the 'good' ECU's by their firmware version (the MEC no.). Then instead of buying a PFC, it'll be heaps cheaper to buy a 95 model ECU.

Tom - damn shame about that. Hmmmm, I wonder what we can do about it, is it a case of try changing the values and see how it goes?

It's a shame.....

J

[B-Man]

Sweet - now I'm selling my '95 ECU when I get my Autronic or Microtech !!

Cheers for that !!

[Guest RedLineGTR]

think the price for 95 ecus just rose..

[benm]

Originally posted by whatsisname

His car has a 3" exhaust off the turbo, pod filter, upped boost (12-13 or so psi) & FMIC. Nothing else! It also made 204rwkw at a dyno day last yr.  

I have a '95 GTS-T ('95 ECU) with the same mods making 203rwkw whilst leaning out at the top.

/me gold coats his ECU.

[whatsisname]

I think the '95 model GTS25t's just became the prefered choice when buying on a very limited performance budget.

I could've saved heaps if I'd have started with a '95! With the usual FMIC, exhaust, pod & extra boost the good ol' 94 ECU went filthy rich giving me a grand total of 126rwkw. The car felt like it too It took a Unichip & retune ($1200 later) to give me ~185rwkw. Bugalugs goes out & does the same basic mod's (without touching the ECU) kills my car on the dyno &, more importantly, on the drag strip!

Originally posted by RedLineGTR

think the price for 95 ecus just rose..

[Ash]

what about 97 ecu's?

Different again?

[Ronin 09]

For sale soon... '95 ECU to be replaced by PFC

[Duncan]

Yeah, I'm wish ash's question.

my 97 ecu runs quite lean, possibly different to the earlier maps as well. Would be interesting to see some later model cars if you hve one handy in canberra.

Thanks for doing those comparos tomr33.

[TomR33]

Yeah, I would be interested to see series II maps too but don't have them.

I should be able to download maps from any Nissan ECU (except R34 GTR) and do the comparison, just need access to the car or ECU for about half an hour.