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R36 Member
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Discussion Starter · #1 ·
Hey Guys, thought I would give a short review of how the alpha maps are handling.

Initial setup: Stage 2, 100 Octane - Publically available map. LC2.

First off, I typically use only 100 octane for my car -- so, I had to essentially 'downgrade' my gas to 91 or 93 octane to use these maps. However, after loading it into my car, wow, what a difference! I felt a lot of power midrange as well as a great standard pickup. Overall, the car felt wonderful. There is a big difference with the alpha maps as well, you get (4) boost maps to play with:

Stage 1: MAP 0 = 13.0 PSI, MAP 1 = 15.5 psi, MAP 2 = 16 psi peak, MAP 3 = 17 psi peak.
Stage 2: MAP 0 = 13 psi, MAP 1 = 15 psi, MAP 2 = 16 psi peak i, MAP 3 = 17.5 psi peak

Do you see the problem here? Look at Boost Map 1: 15.5 PSI for Stage 1, and 15.0 for Stage 2. What is up with that? Anyhow, it seems the only real difference between the maps is the .5 psi boost for MAP 3. Let me tell you though, with this map, you will fly! It's quite amazing what the engineers were able to do with 91 octane!

Let's talk about LC4. What a huge difference! Smooth as butter! I can't believe I'm in the same car! It handles daily driving quite nicely, you will not notice the inevitable 'slow-go' anymore. It will pickup when you hit the gas.

There is a minor difference that I was not use to. I have a hill that I need to climb to get into my place, and - we have a key to get into the complex. I would typically 'badge-in' and roll back with the GTR (not hit the brakes) and roll on in, I had to, there is a gate that lifts up to let me through. With LC4, I can't roll back, it kept me exactly where I'm at. Now, I'm not saying that's a bad thing - it's just different.

Overall...

These maps, loaded with LC4 are PHENOMENAL! They make me feel like I'm driving another car, it's so great! Great work to Cobb and all who helped participate to make this possible!
 

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Greyzilla activist
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How does one obtain the v3.6 stage 2 map?
 

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Good to hear that it is working good for you! I am a bit confused by the boost maps vs. "live map switching" as Tim Bailey was reviewing on the Cobb website. Now I know you can have up to 9 maps to switch from on the fly using the cruise control function. Maybe Joe can clear this one up for us - When using the cruise control function, does it just change boost maps? Or fuel maps? That part is unclear to me as I don't want to be using 91 octane on a 100 fuel map if that is what is changed during the new "live map switching" function.
 

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Boost, fuel, ignition, valve timing, injector data, throttle mapping, MAF tables or equivalent for speed density (and more) are all switchable/live mappable with the pro tuner software. For the staged maps I think Tim will mainly be adjusting boost, fuel, ignition.

You could go from less than stock to three or more times stock power using the map switching/live mapping features if you planned ahead your adjustment ranges, all without a flash. Different engine sizes, different fuels, different turbos/injectors etc.
 

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Premium Member
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Boost, fuel, ignition, valve timing, injector data, throttle mapping, MAF tables or equivalent for speed density (and more) are all switchable/live mappable with the pro tuner software. For the staged maps I think Tim will mainly be adjusting boost, fuel, ignition.

You could go from less than stock to three or more times stock power using the map switching/live mapping features if you planned ahead your adjustment ranges, all without a flash. Different engine sizes, different fuels, different turbos/injectors etc.
Well put. To the OP, as Thistle mentioned there are many variables that are altered aside from peak boost levels. And LC4 is shifting is smooth as butter. Thanks for sharing.

There is usually no need, in the real world, to actually reflash the ECU under normal conditions. Live map switches changes all the key parameters that a tuner would want. Some things, like speed limits, rev limits, and sensor calibrators require a reflash, but those things don't usually need to be changed by the end user.
 

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Thanks for the email, Joe-cleared it up for me!
 

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Not sure what you mean. I'm using LC4 on my 2010...
 

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Gotcha!
 

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R36 Member
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Discussion Starter · #13 ·

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COBB Tuning Firmware Engineer (Hacker)
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Eric, and I have to modify the LC4 and other TCMs so they can be applied to the older cars. I'm sure Nissan "could" do it for you if they really wanted, but they want you to buy a 2012. We just want you to enjoy your GT-R!

Joe
 

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Sophisticated
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LC4 on a 2010 USDM GT-R only launch at 3300 RPMs. That is what he is talking about.

Joe
Joe,

Cobb will sell SO many new 006's / upgrades if you can get the LC4 working. It's money in Cobb's pocket. Do you have an ET yet? Is the development on the back burner to another project currently?
 

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COBB Tuning Firmware Engineer (Hacker)
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We've got most of the LC4 functionality working on the older GT-Rs. Were working on the LC4 MY09 launching at 3300 RPM, LC4 Touch points and Clutch learning. Most people that have used it love it, even with the missing functionality. we are working on the last few things and hope to have an official release soon!

Joe
 

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we are working on the last few things and hope to have an official release soon!
I think most people are looking to obtain the LC4 and the smoother shifting is just gravy. I know I won't buy an 006 until you have the LC4 and all the features fully functional.

Thanks for your continued work on these cars Joe.
 

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Wow, biznaka, you weren't kidding. I loaded map 3 last night but wasn't able to test it fully until this afternoon (raining all night last night). All I can say is, wow. I am impressed at how much power you can squeeze out of 91 octane. I can't even imagine what it would be like with 100 octane!
 
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