Nissan GT-R Forum banner
1 - 20 of 71 Posts

·
Registered
Joined
·
5,224 Posts
If you didn't already know, EcuTek now fully supports both the Engine and Transmission tuning for the EURO and US Spec 2015 Nismo!

For those of you who have a NON-Nismo 2015 GTR this means you can upgrade your TCM software to Nismo Spec using EcuTek - Contact your tuner!

Early on there was a lot of speculation about what the Nismo was going to have, larger turbos and injectors etc.

Now that there's full support I thought I share some of the larger ECM tuning differences between the Nismo and non-Nismo.

The screenshots are showing 3 things

1. Stock Nismo Maps
2. Stock Non-Nismo Maps
3. Difference between maps are highlighted in red

Primary Fuel Map -

X-Axis scale it slightly changed under high engine load
Air Fuel Ratio is richer after 2800RPMs mostly in the higher engine load area



Primary Ignition Map -

Ignition Timing has mostly been reduced during higher engine load (when on boost). You can also see that ignition timing was added in a few places.



Primary VVT Map -

During low load high RPM a few degrees was removed but the biggest changed is medium to high engine load where more VVT has been added.



Boost Control -

Desired Boost in 3-6 gear has been slightly increased, especially in the upper RPMS.
Desired Boost when Launching has also been increased (Not Shown in screenshots)





This is what NISMO Chief Product Specialist Mr. Hiroshi Tamura has to say about the Nismo - This was taken at SEMA 2014.

I find it especially interesting that gives the owner permission to Tune the car - just not on Nissan dime!


John
 

·
Founder/Admin
Joined
·
26,441 Posts
#1 how does ecutek intend to offer the same ECU tune to a GTR that doesnt have the same turbos or fuel delivery as the adjustments to the tune work with those components. the reason the power was moved up higher in the RPM range was to coincide with the characteristics of the larger GT3/SpecV Turbo and the timing is different due to the fuel feed from the larger pump

#2 what was max boost pressure vs standard GTR?

#3 what were the changes to the TCM logic. The launch feels different than previous DBA GTRs (especially LC4(

#4 more detail about increased boost at launch?

#5 technically Tamura was talking about his philosophy in general ( in comparison to Mizuno) and wasnt talking about or suggesting tuning the NISMO specifically
 

·
Registered
Joined
·
5,224 Posts
#1 how does ecutek intend to offer the same ECU tune to a GTR that doesnt have the same turbos or fuel delivery as the adjustments to the tune work with those components. the reason the power was moved up higher in the RPM range was to coincide with the characteristics of the larger GT3/SpecV Turbo.
#2 what was max boost pressure
#3 what were the changes to the TCM logic. The launch feels different than previous DBA GTRs especially LC4
#4 more detail about increased boost at launch?
#5 technically Tamura was talking about his philosophy in general ( in comparison to Mizuno) and wasnt talking about or suggesting tuning the NISMO specifically
1. EcuTek has only provided tuning support for both the ECM and TCM. I think your confusing my comments - any 2015 GTR can now run the Nismo Tuned TCM.. what turbos, fuel pumps etc wont have any effect on what we flash into the TCM.. It's similar to flashing LC5 in a car that had LC4 or Flashing Super R Mode in a car that had LC1-6.
2. MAX Boost was 1.02bar @6400RPM before any compensations - see the screenshots above
3. Pretty much every year there's small code changes, sometimes its trq reduction related, throttle body related, min/max or timers thresholds. There's code changes in the Nismo TCM Rom, nothing I can discuss at this time.
4. DBA GTRs have different boost control settings for after launching. 1st and 2nd Gear Desired Boost is normally different and the car also uses a different wastegate look up map. Similar to the Per Gear Boost Control changes I posted above the desired boost settings in launch control is slightly more aggressive.
5. I dont agree. My take from the video is he wants you to make the car yours, he explains you can tune the car, just dont come back looking for us to fix it after you break it.

John
 

·
Registered
Joined
·
5,224 Posts
Discussion Starter · #11 ·
anything in there that would make this this car more affected or say crippled by say 91 octane than the standard GTR
Hard to comment on that.

The tune defiantly doesn't look overly aggressive, you can see Nissan reduced ignition timing and add more fuel, something tuners normally do when larger turbos are installed.

I believe SP Engineering bought a Nismo, I would ask him how the car is running on 91oct

John
 

·
Founder/Admin
Joined
·
26,441 Posts
the TCM logic on launch feels more tame than LC4 or maybe even LC5 as it almost pauses for a just millisecond then goes to avoid wheel spin. to me it almost feels like its using its power once its in motion rather than the power to put it into motion if that makes sense as the initial thrust forward seems more conservative. its already been proven this doesnt slow it down any but I would be interested to see if this method has an adverse affect on a otherwise stock GTR

It could be very similar to how the 15 launches in general for all I know as ive had loads of experience with stock LC4..some with LC5 but not much on the 14/15 iterations of the logic. but there is definitely a more reserved feeling off the line.. im wondering if its slipping the clutch even more so than how LC5 did vs LC4 which was a more abrupt launch
 

·
Registered
Joined
·
5,224 Posts
Discussion Starter · #14 ·
the TCM logic on launch feels more tame than LC4 or maybe even LC5 as it almost pauses for a just millisecond then goes to avoid wheel spin. to me it almost feels like its using the power once its in motion rather than the power to put it into motion if that makes sense.
I appreciate that feedback, I'll be sure to pass that on to the dev guys at EcuTek

To give you a idea - since LC1 Nissan has added over 30 settings / timers / thresholds in the TCM that are all directly related to how Launch Control works and that's just the ones EcuTek can kinda understand. TCM is very complicated !

John
 

·
Founder/Admin
Joined
·
26,441 Posts
another thing maybe not totally related is the NISMO or maybe the 15 in general doesnt creep at all hardly and the shifts feel a little extra lazy with the default 0 0 0 0 transmission settings where at least the 12 and 13 did. I talked to NIssan and im doing 2 2 1 1 at my 1k check up tomorrow
 

·
Registered
Joined
·
2,248 Posts
This is what NISMO Chief Product Specialist Mr. Hiroshi Tamura has to say about the Nismo - This was taken at SEMA 2014.

I find it especially interesting that gives the owner permission to Tune the car - just not on Nissan dime!
Tamura is a cool guy. I have known him about 14 years, since back in the MotoRex days. He has a 600 hp R32 GT-R. http://blog.caranddriver.com/takes-one-to-know-one-nissans-gt-r-product-specialist-shows-off-his-600-hp-skyline-r32/

He is one of the good ones. He has been around the GT-R since the R32, was involved with the R33, and planner on the R34. He knows that people are going to tune the cars. He knows that 545 hp, or 600 hp is just a starting point for many. He also knows where there will be problems once you push that power up higher.

As you see in the video, he says if you tune it, then its on you. It is a realistic statement, that I know a lot of people don't get.
 

·
Registered
Joined
·
5,224 Posts
Discussion Starter · #19 ·
Tamura is a cool guy. I have known him about 14 years, since back in the MotoRex days. He has a 600 hp R32 GT-R. http://blog.caranddr...hp-skyline-r32/

He is one of the good ones. He has been around the GT-R since the R32, was involved with the R33, and planner on the R34. He knows that people are going to tune the cars. He knows that 545 hp, or 600 hp is just a starting point for many. He also knows where there will be problems once you push that power up higher.

As you see in the video, he says if you tune it, then its on you. It is a realistic statement, that I know a lot of people don't get.
I had to rewind the video , at first I a little shocked.

Wish I had met him!

John
 

·
Registered
Joined
·
2,248 Posts
1 - 20 of 71 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top