The ‘uncrackable’ GT-R (R35) ECU


Some claims had been made to suggest the new Nissan GT-R ECU was encrypted and ‘uncrackable’. Well folks, we’ve ‘cracked’ it. Our own GT-R is a JDM version with the fun-sapping 180 kph (112mph) speed limiter. Thankfully, it can now be removed. We’ll continue to do more in-house testing and hopefully get some beta AccessPORTs out to the other two JDM GT-Rs in the US inflicted with the same speed limiter woes. By the time North American spec cars arrive, we should be well prepared and practiced in the art of tuning the GT-R’s ECU.

Stay tuned for more tuning updates as we begin to see what can be extracted from the new GT-R with some ECU tuning!

P.S. For the 2007+ 350Z and newer G35/G37 owners reading this, don’t worry…we’re already testing the AccessPORT for your vehicles as well. We have both a 2007 350Z and a 2008 G37 both undergoing ECU development as we speak. :)

Pre-ordered the Accessport - Mazda Speed Forums: Mazdaspeed High Performance Forum with Gallery, Specs, discussion & more on April 2, 2008 says:

[…] Originally Posted by BlackMS3 Now it’s LATE April?? I suspect this is the time hog COBB Tuning Blog » The ‘uncrackable’ GT-R (R35) ECU […]

mindlessoath on April 2, 2008 says:

cant wait to see more development, really interested on the tuning capabilities. check out more R35 stuff at !

Phil on April 6, 2008 says:

I feel super priveleged to be a part of this development!

STI Forum on April 8, 2008 says:

Its nice to see cobb pushing the limits on the new GTR stuff and debunking the myths and speculation that surrounded this car prerelease.

Jalopnik on April 8, 2008 says:

Unmoddable GT-R ECU Cracked, Bye-Bye Speed Limiter [Industry News] …

Remember the ECU in the Godzilla-like 2009 Nissan GT-R ? Yeah, it was supposedly uncrackable and unmoddable…

The ‘uncrackable’ GT-R (R35) ECU: cracked at Top Dead Center on April 8, 2008 says:

[…] Full article: The ‘uncrackable’ GT-R (R35) ECU [cobbtuning] […]

Nissan GT-R: violata l’inviolabile centralina! « marko’s weblog on April 9, 2008 says:

[…] sembra che qualcuno alla Cobb Tuning sia riuscito nell’intento, crackando l’unità di controllo motore (ECU) di una GT-R per il […]

Motor Authority » Nissan GT-R ECU cracked and delimited on April 9, 2008 says:

[…] customers the encryption on the ECU was very sophisticated and difficult to crack, U.S.-based COBB tuning has indeed cracked the speed limiter and is now working on sorts of other modifications including […]

Japanese Spec Nissan GT-R ECU Cracked - GT-R Register - Official Nissan Skyline and GTR Owners Club forum on April 9, 2008 says:

[…] not been picked up by the radar but here it is: Luxvelocity : Japanese Spec Nissan GT-R ECU Cracked COBB Tuning Blog » The ‘uncrackable’ GT-R (R35) ECU A fully cracked ECU could mean that we can see 736kW+ GT-R’s again, to Nissan’s big […]

Nissan GT-R ECU cracked - HondaSwap Forums on April 11, 2008 says:

[…] GT-R ECU cracked COBB Tuning Blog » The ‘uncrackable’ GT-R (R35) ECU I guess there’s hope for everyone. Including g35/7 and 350z owners. Now only if I could get my […]

Rick on April 11, 2008 says:

Power House Amuse did the ROM tune in February. Cobb needs to stop bragging and do some research.

Trey on April 11, 2008 says:

Rick, if you read my post there was no bragging involved. I simply stated the fact that we were in. If some other blogs/forums are posting comments that come across as bragging, I suggest you bring it up with them. Again, read MY post…not the post written on the blog that linked you into here.

Second, if you want to be really technical Power House Amuse wasn’t the first either, or was Mine’s. They both bought their equipment from Techtom who gets their info direct from ‘friends at the factory’. On the other hand our research is all performed in-house.

Regardless, the ECU is tunable and that’s all we were trying to say. I wasn’t trying to imply anything else. :)

LIC Motorsports on April 22, 2008 says:

Great work guys…glade to see you all pushing the envelope of what can/can’t been done…or so some say.

Keep it up.


GT-R Forum on June 30, 2008 says:

Trey – how easy will it be to take what you learned on the JDM ECU and use it on the USDM ECU? Will there be anything holding you back when the USDM cars are here? Will you have maps ready for release with the US car?

Scott on July 11, 2008 says:

2007+ G35 sedans need some love. We’re all here and ready for some tuning. More than happy to beta one for you. Experienced in beta testing turbo diesel tuning.

C-raz on July 27, 2008 says:

Hey Guys,
Great job. However, the youtube video on cobb Was rather unclear as I saw the meter just moved up a bit. It would be great if you can show it from the front instead of the side. Anyway, what are the further developments that you have got? And does the ECU tune do anything to the car’s computerized information system. Are there any upgrades etc that you can purchase. This guys ( claim that they cracked it too but its all talk at the moment at least your efforts were shown. By the way any information on your full product line for the GTR that is purchaseable? Obviously all of us are interested in performance. Great work guys!

HR 350Z on August 5, 2008 says:

Any updates related to the HR engine’s ECU?

Daniel r on July 5, 2009 says:

if i buy a gtr i could unlock it.
and can some one please tell me were i can unlock the limiter

Dan@Cobb on July 7, 2009 says:

Daniel R – We’ve released our tuning device called the AccessPort about a year ago which would solve your problem. By reflashing the GTR’s factory ECU with any of our premade stage flashes it will remove the factory speed limiter and increase lots of hidden power within your vehicle.

More information can be found here:


arhodas on January 9, 2010 says:

is the gtr cobb tune traceable by nissan when uninstalled through the accessport? will the transmission and engine be able to deal with the extra power and torque?

Gary on January 20, 2010 says:

Even when completely uninstalled, the “black box” records the number of times that the ECU has been flashed. While the dealer most likely won’t know WHAT was flashed to the ECU, they will know that something was flashed to it, even if it is no longer there.

The transmissions and engines have been holding up very well with the additional power of the AccessPORT.

vidas911 on October 13, 2010 says:

Any idea where the GT-R (R35) ECU is located?
Thanks, Vidas