RB25 ECU tuning thru PC

[zerodameaon]

I Just got my car last night. shes had the engine put in her by another guy( shes still a project car so i can make her mine) but he had the engine running rich, and boost turned down. he said he had that adjusted thru an eprom he had installed and i know there is a cable you can get to hook it up to your computer. i was wondering if any one knew what i was talkin about and what software you would use. or if there was a non computerized way to adjust the boost and lean the engine out.

[S12_hybrid]

The options are:

A) He's got an aftermarket ecu (ie: linkefi, haltech, etc)B) It's a chipped rb20 ecuC) He's lying and the car is just running very ****ty

Open the case to the ecu and see if the chip is soldered in or if it's a hotswap eeprom.

-Dan

[zerodameaon]

thanks for that bit of info. ill look into what kind of ecu or eeprom it has if it has one.

[l0nestar]

You can also just look at the SN on the ECU to see if it is a 20 or 25. I can take a pic of mine (25DET-S1) or write the info back here if you want.

That is, before you go and pull / open up your ECU

[craz4240]

Also could be tuned Z32 ECU,but tuned rb25 is unlikley

[mello88]

I Just got my car last night. shes had the engine put in her by another guy( shes still a project car so i can make her mine) but he had the engine running rich, and boost turned down. he said he had that adjusted thru an eprom he had installed and i know there is a cable you can get to hook it up to your computer. i was wondering if any one knew what i was talkin about and what software you would use. or if there was a non computerized way to adjust the boost and lean the engine out.

The cable to the ecu is usually for diagnostics thru the Consult port. Just reading data off the ECU. Usually on a eeprom tune you need to remove the chip, use a reader/writer box attached to your PC to read/burn the chip.. Then reinstall it back into the ECU. But go research romulator if you're interested in a live tuning option.

Now regarding your boost question, using a manual boost controller or a electronic boost controller you'll be able to adjust the boost without touching the ECU. However without a SAFC at least or a wideband you'll probably want to leave it alone for now. To lean it out, you should reburn your chip OR look into getting a SAFC or a true standalone (PowerFC, etc).

What turbo is on the motor? If it's the stock ceramic one you won't want to run more than 12-14 psi.

GL

[zerodameaon]

mainly all im looking to do is to lean the car back out. im not sure of how to pull that one off. ill have to search the site more.

[bmadd2402]

RB25deT ECU sucks really bad. Try searching for "rich and retard" on here or SAU. Its like if you do anything to increase the amount of air to the motor, it dumps fuel and pulls timing. PITA.

[zerodameaon]

thanks for the info.