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  #121  
Old 06-28-2015, 07:44 PM
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Re: green diesel engineering tune

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Originally Posted by JGCDieselPowered View Post
Chad - I'm excited for you and can't wait to hear how you like it. I plan to do this in a couple weeks. Just don't have downtime available right now with work travel. Looking forward to real world feedback.

I'll let you all know. Like a kid waiting for X-Mas......in July.

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  #122  
Old 06-28-2015, 11:22 PM
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Re: green diesel engineering tune

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Originally Posted by chadg2 View Post
anyone else with the Hot Tune have anything to add? Anyone hear a turbo in there whistle? Anyone else experience a change in engine and or exhaust sound? Got mine on order. Sad Jeep in my garage without an ECU.

The engine noise at idle is slightly louder. I installed my GDE, took it for a quick test drive, then installed a CAI. Stock was ok, but GDE puts a grin on my face with little romps of the go pedal going up short hills. The motor just pulls! Come to a stop, rev to 2k, then drop the brake and smash the gas and you'll be surprised how hard you get stuck in your seats. My first 2 tanks were 29.1 and 28.5, going between 55 and 80 with some extended idling and messing around with the power. I'm happy, it still drives very smooth.
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  #123  
Old 06-29-2015, 09:45 AM
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2nd tank update:

The mileage is up slightly to 28.22mpg city. I snuck in 626 miles on the tank. That was normal driving with some two lane road passes and a few full throttle blasts to 60. Overall I'm thrilled with the tune. The mileage speaks for itself. The only downside remains the lack of the flash tool.
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  #124  
Old 06-29-2015, 08:05 PM
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Re: green diesel engineering tune

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Originally Posted by farfromovin View Post
The engine noise at idle is slightly louder. I installed my GDE, took it for a quick test drive, then installed a CAI. Stock was ok, but GDE puts a grin on my face with little romps of the go pedal going up short hills. The motor just pulls! Come to a stop, rev to 2k, then drop the brake and smash the gas and you'll be surprised how hard you get stuck in your seats. My first 2 tanks were 29.1 and 28.5, going between 55 and 80 with some extended idling and messing around with the power. I'm happy, it still drives very smooth.
Are you doing hand calculations for MPG, or is this the reading off the dash computer? If it is hand what does your computer read compared to actual MPG?
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  #125  
Old 06-29-2015, 09:14 PM
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Re: green diesel engineering tune

any check engine light with the added CAI? I wonder if any parameters were changed from stock with the cold air intake flow on the Hot Tune? I'm using K&N without any check engine on stock tune. I know some people have had check engine lights on other vehicles with better flowing filters.
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  #126  
Old 06-29-2015, 11:16 PM
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Re: green diesel engineering tune

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Originally Posted by chadg2 View Post
Are you doing hand calculations for MPG, or is this the reading off the dash computer? If it is hand what does your computer read compared to actual MPG?

My EVIC reading is 4 mpg optimistic.


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  #127  
Old 06-30-2015, 12:15 AM
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Re: green diesel engineering tune

No CEL for me with a CAI and a CCV catch can! First tank evic was optimistic by 4 mpg second tank it was optimistic 1 mpg.
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  #128  
Old 06-30-2015, 07:07 PM
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Re: green diesel engineering tune

just got shipping confirmation. hopefully the ECU will arrive on Thurs in time for holiday weekend fun. looking forward to improved power, better throttle tip-in and engine braking
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  #129  
Old 06-30-2015, 09:29 PM
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Re: green diesel engineering tune

Could anyone provide the cliff notes as to how you simultaneously get better MPG and more power? Is the boost pressure from the turbo increased? Is the fuel rail pressure increased at all? Is some factory safety overhead removed and the engine brought closer to knock/detonation but still safe?
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  #130  
Old 07-01-2015, 01:35 AM
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Re: green diesel engineering tune

Well, they've removed pilot injections in certain conditions. Those are for sound seasoning and emissions reasons iirc. The pilot injections rob power. They also nearly eliminate the egr which saves all kind of crap clogging the dpf, reducing regen intervals. That is economy. They talk a lot about optimized combustion which back in my tdi tuning days meant advancing the injection timing. You can play with the VNT duty cycle to raise boost slightly without injecting more fuel and possibly getting more power as the VM is a smokey motor compared to other CR's.
I'm not sure if they did raise boost, I'd be surprised to get 50ft/lbs without it though. I haven't read anything about them increasing rail pressure either.
With the injection system on our engines, there is something cool with injection pulse shaping that I've read which correlates to the amount and timing of up to 8 injection events per stroke. They might have a hand in that too.
It's not uncommon for tuned turbo diesels to get more economy AND power. Well, you only get the economy if you don't use that extra power all the time. Hard thing for me to do lol. I've averaged a hair over 28mpg for the first 1900 miles on my 4x4 ecodiesel doing mostly 70-75mph hwy cruising. I wouldn't say I'm getting great mpg, but it's not bad considering how much I use the power and how many sea level to 7500' mtn passes I've gone through at 100deg with the AC on lol.
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  #131  
Old 07-01-2015, 08:56 AM
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Re: green diesel engineering tune

Quote:
Originally Posted by farfromovin View Post
Well, they've removed pilot injections in certain conditions. Those are for sound seasoning and emissions reasons iirc. The pilot injections rob power. They also nearly eliminate the egr which saves all kind of crap clogging the dpf, reducing regen intervals. That is economy. They talk a lot about optimized combustion which back in my tdi tuning days meant advancing the injection timing. You can play with the VNT duty cycle to raise boost slightly without injecting more fuel and possibly getting more power as the VM is a smokey motor compared to other CR's.
I'm not sure if they did raise boost, I'd be surprised to get 50ft/lbs without it though. I haven't read anything about them increasing rail pressure either.
With the injection system on our engines, there is something cool with injection pulse shaping that I've read which correlates to the amount and timing of up to 8 injection events per stroke. They might have a hand in that too.
It's not uncommon for tuned turbo diesels to get more economy AND power. Well, you only get the economy if you don't use that extra power all the time. Hard thing for me to do lol. I've averaged a hair over 28mpg for the first 1900 miles on my 4x4 ecodiesel doing mostly 70-75mph hwy cruising. I wouldn't say I'm getting great mpg, but it's not bad considering how much I use the power and how many sea level to 7500' mtn passes I've gone through at 100deg with the AC on lol.
Pilot injections are also used to aid in Cold weather starting. I wonder if any testing has been done with this tune in cold weather climates?
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  #132  
Old 07-01-2015, 10:03 AM
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Re: green diesel engineering tune

GDE is based just outside of Detroit. So, I suspect so.


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