RB25 ECU options

[Krazykouki]

My car has run on it before but it did not run right. My car did not have the air temp sensor and would throw the code for it as well. I also had the Z32 MAF and tuned it with an SAFC 2.

Now, I have a S1 RB25 with the stock ecu. I keep hitting the annoying boost cut at around 10psi. What ECU can I run that I can convert to a MAP sensor setup instead of a MAP setup?

Z32? RB26? RB20?..etc..etc..

[rb25det250sx]

your not hitting boost cut at 10 psi. something else is wrong... i;ve taken my car to 14psi, and one time all the way to 16psi on stock turbo. If your car is stock then the safc is the best bet. but it you want to make large adjustments, i would suggest the haltech. I love mine, but many people like the aem ems too.

[StricNyne]

haltech pro for r33/r32 skyline

[Krazykouki]

Right now I have an SAFC2, Z32 MAF and it is most definitely hitting boost cut.

I do not want to go with a standalone. I want to stick with a Nissan OEM ecu. I have an RB26 ECU laying around and have read up on the Z32 and RB20 ecu conversion, I'm just unsure which will be better. I read that the Z32 ecu can support a MAP setup instead of a MAF setup but I do not know the validity of that.

[StricNyne]

just curious why not standalone ? it was probally best thing i did to car, haltech is little pricey (cheaper than most standalones though) but literally my best investment, and it will work on any motor, you can sell maf, sacf, stock ecu and make some of that money back, map sensor kicks a**!! plus u wont need turbo timer, rev limiter (like a bee-r), 2 step, closed loop boost control, closed loop 02 i sold avcr and all my xtra crap to finance it

[StricNyne]

also to my knowledge NO nissan ecu used a map sensor, maybe for coldstart or something but not for long time usage, and if z32 ecu used a map sensor you wouldnt be running a z32 maf, cheapest solution to go to a map sensor i know of is the piggyback with emanage ultimate

here is a guide

http://www.skyline-owners-club.com/foru ... faq-2.html

[Krazykouki]

just curious why not standalone ? it was probally best thing i did to car, haltech is little pricey (cheaper than most standalones though) but literally my best investment, and it will work on any motor, you can sell maf, sacf, stock ecu and make some of that money back, map sensor kicks a**!! plus u wont need turbo timer, rev limiter (like a bee-r), 2 step, closed loop boost control, closed loop 02 i sold avcr and all my xtra crap to finance it

I have done a little bit of research on it. Seems that If you decide to use a rom type tuning program NISTUNE then you can use the Z32 ecu b/c it has VVT capabilities.

Here is what I found:

One of the workshops we support has his R33 running using Z32 ECU

I'm using Z32 ECU's for R33's for some time now and I can highly recommend it.

Got fed up trying to get 33's running properly using HNR32/HCR32 ECU's. Even after modifying parts of the code to software simulate the throttle switch and a few other things, I still wasn't satisfied ....these things are just too limited. (imo)

advantage of the Z32 ECU is it will retain VTC on the R33 and the Z32 ECU has in/outputs left when used on the R33, which can be used for other purposes (only possible after extensive code modification though) For one customer I reprogrammed a "Z32 ECU converted R33" to have the ECU switch water injection, have a map sensor instead of a MAF sensor and have the "check engine" light come on when detonation was detected.

When using a Z32 ECU you can basically use a stock Z32 binary and copy over the most important constants, maps and tables from the R33. To get it perfect some parts of the code need to be modified, but with stock code it will already run 10 times better then when using a R32 ECU

>> Still to grab the exact wiring modifications required from him

for the RB25DE(T) based R33's these are the wiring modifications:

R33 pin 19 to Z32 pin 34 R33 pin 105 to Z32 pin 110 R33 pin 110 to Z32 pin 105 R33 pin 112 to Z32 pin 114 R33 pin 114 to Z32 pin 112

R33 pin 57: cut Z32 pins 29+52 : join

Best is to use a FIELD harness extender, so you don't have to chop up the original wiring harness.

Because an unmodified Z32 ECU only has 1 detonation sensor input, you will have to choose which sensor you want to use. if you leave pin 23 (r33) connected to pin 23 (Z32), it will monitor the sensor for cyl. 1-3 if you rather have it monitor the rear cylinders 4-6, you will have to cut pin 23 (r33) and connect pin 24 (R33) to pin 23 (Z32)

Only thing I haven't been able to figure out, is how the auxilary fan on the R33 is switched....can't find it on any of the wiring schematics I have.

Jollwah had a typo correction:pin 52 is the pos sig for the crank angle sensor.

the correct pin is 55 (LH exhaust gas sensor).

Info gathered from here: http://ecu2.forumwise.com/ecu2-thread1825.html

And you can get nistune from here: http://www.nistune.com/

Im going this route when tax return comes around.
Modified by meet07 at 6:42 PM 8/13/2008

[Krazykouki]

I do not want a full stand alone. I want something that uses a Nissan ECU, basically, I want to use Nistune but I am trying to figure out what other options I have as far as ECU's are concerned. Which ECU's work the best..etc..etc..

I HAVE an R32 GTR ecu laying around but I do not have an RB20 / VG30 ecu, from everything I've read up on them, supposedly the VG30 ecu can be changed using Nistune to use a MAP instead of a MAF.

[StricNyne]

ok so you answered your own question, if meet said he did it than you need to ask him, it seems like info u want is right there in what you posted

[Krazykouki]

I read that the Z32 ecu can support a MAP setup instead of a MAF setup but I do not know the validity of that.