2009 Supernova 6372 build thread

[pwerwagn]

Hi all! Been a lurker for YEARS, as I have a 2005 Gulfstream 6316 Conquest Super C with the 8.1 with a whole bunch of mods/upgrades (fixing to be for sale). I learned a ton reading on here about the issues with the Kodiak Chassis Super C, and I have read a bunch about the shortcomings of the 4200 chassis as well, and I am comfortable taking on the challenge!

My Parents bought this 2009 6372 Supernova a few years back when my Dad retired. It was his dream to own a Supernova for many reasons. He recently passed away unexpectedly so I purchased it from my Mom to keep it in the family and keep my Dad's dream alive. We use our current Super C to tow our boat, our truck that we desert race, etc. We spend a lot of time in the dirt and absolutely love our current Super C, and we are looking forward to many good times with the new one.

I was a diesel mechanic for a few years, so I am very aware of the 6.0/VT365 short comings. I have already done studs and new HG's, new oil/egr cooler, TS MP8 pressure box, etc. I have checked the FICM, and voltage is good. I am currently talking to a few FICM tuners about a FICM tune, because mine is grossly underpowered. I was hoping the FICM was weak, but unfortunately its in good shape. My 8.1 in the 6316 loaded to the same weight will run circles around this VT365 on hills and in town. I also have an issue with the fan clutch as many others have. Mine is purely mechanical unlike the truck 6.0, and even after replacement it will never shut off. I recently readjusted the engagement temp on the clutch, and it still runs 100% of the time. I will adjust it a few more times, and then might bite the bullet and throw in a Horton EC450 clutch instead of elec fans.

My Dad and the previous owner also addressed some of the other shortcomings. My Dad replaced the main slide controller with one that can control the motors independently in case they get out of synch. The rear suspension was replaced with a rubber shackle mount setup (I'm drawing a blank on the name). It has Road King shocks all around. The RV drives like a dream, other than the noise from the fan and the lack of power.

Anyhow, just wanted to say hi. I know a few of you have done cool things like exh brakes, egr delete, water/meth injection, etc. that I will probably inquire more about!

--Jeff

[RayChez1]

It seems like you have lots of mechanical knowledge about these coaches. You are a lucky man because they can get complicated at times. Best of luck and enjoy.

[pwerwagn]

Here is a picture of the RV, towing a 29' Yiro deck over Trophy Truck trailer:

Originally Posted by RayChez1

It seems like you have lots of mechanical knowledge about these coaches. You are a lucky man because they can get complicated at times. Best of luck and enjoy.

Thanks Ray! They certainly can get complicated. But a challenge is always fun!

--Jeff

[pwerwagn]

Here's another pic of it parked with my 2005 Conquest in Bloomfield, NM:

[pwerwagn]

Little update to this thread.

In my quest for more power, I removed the muffler/cat and it’s now 4” from the downpipe back with a straight thru diamond eye muffler. Noise is no different, spool seems a little better. I’m taking it on another trip this weekend to compare to last weekend. I also added a scan gauge so I can monitor EOT mainly. I already have analog boost/egt gauges.

I also am in contact with a shop working on tuning for the VT365. He already has a FICM tune that will work (I suspect the hyper max was only modifying ficm values). He has an econo tune and 40hp and sone bigger but will likely have egt issues with over 40.

Also figured out my ICP sensor wasn’t functioning correctly so I replaced that. I will see if the MP8 works any better with a good sensor, or perhaps the mp8 killed the sensor.

Other than the major lack of power compared to my old 8.1 super C, were loving the supernova. Drives way better, and much nicer once parked.

I’ll update as I get more tuner info if anyone’s interested.

Jeff

[Joshdmoore]

Originally Posted by pwerwagn

Little update to this thread.

In my quest for more power, I removed the muffler/cat and it’s now 4” from the downpipe back with a straight thru diamond eye muffler. Noise is no different, spool seems a little better. I’m taking it on another trip this weekend to compare to last weekend. I also added a scan gauge so I can monitor EOT mainly. I already have analog boost/egt gauges.

I also am in contact with a shop working on tuning for the VT365. He already has a FICM tune that will work (I suspect the hyper max was only modifying ficm values). He has an econo tune and 40hp and sone bigger but will likely have egt issues with over 40.

Also figured out my ICP sensor wasn’t functioning correctly so I replaced that. I will see if the MP8 works any better with a good sensor, or perhaps the mp8 killed the sensor.

Other than the major lack of power compared to my old 8.1 super C, were loving the supernova. Drives way better, and much nicer once parked.

I’ll update as I get more tuner info if anyone’s interested.

Jeff

Thanks for the update. I am very interested, I love my gulfstream just wish she had more power.

What scan gauge did you add?

Josh

[pwerwagn]

Hi Josh,

I put in a scan gauge D. It was ~150$ and gives you some extra gauges like oil temp, egr position, exhaust back pressure, etc. Unfortunately it does not have IPR, ICP, VGT or FICM voltage values.

I have the list of added PID’s to program in if anyone needs them.

Jeff

[pwerwagn]

Here are all the “x gauges” that can be programmed into the scan gauge for the VT365. It looks like a lot of work but it’s not bad once you have these codes. The owners manual will tell you how to program, takes about 2 minutes per added gauge and you can add 25. There are already ~20 or so before you add these. I watch oil temp and coolant temp next to each other. It also has all sorts of fuel mileage stuff, cost per mile, 0-60/ 1/4 mile timers, etc.

The PIDS below will save you a lot of time. I had to do a scan and manually input about 65 16 digit codes to scan gauge and about a week later one of their reps sent me back which ones were gauges with the inputs below. You can skip the whole section about retrieving codes.

Driver's Demand Engine - PercentTorque(%)
TXD: 00
RXF: 11F002040000
RXD: 2008
MTH: 00010001FF83
NAM: User Defined

Actual Engine - Percent Torque(%)
TXD: 00
RXF: 11F002040000
RXD: 2808
MTH: 00010001FF83
NAM: User Defined

Engine Speed(rpm)
TXD: 00
RXF: 11F002040000
RXD: 3010
MTH: 000100080000
NAM: User Defined

Transmission Output Shaft Speed(rpm)
TXD: 00
RXF: 11F002020000
RXD: 2010
MTH: 000100080000
NAM: User Defined

Percent Clutch Slip(%)
TXD: 00
RXF: 11F002020000
RXD: 3008
MTH: 000200050000
NAM: User Defined

Transmission Input Shaft Speed(rpm)
TXD: 00
RXF: 11F002020000
RXD: 4010
MTH: 000100080000
NAM: User Defined

Transmission Torque Converter Ratio(Ratio)
TXD: 00
RXF: 11F0020C0000
RXD: 1810
MTH: 000103E80000
NAM: User Defined

Accelerator Pedal Position 1(%)
TXD: 00
RXF: 11F002030000
RXD: 2008
MTH: 000200050000
NAM: User Defined

Engine Percent Load At Current Speed(%)
TXD: 00
RXF: 11F002030000
RXD: 2808
MTH: 000100010000
NAM: User Defined

Front Axle Speed(MPH)
TXD: 00
RXF: 11FE02BF0000
RXD: 1810
MTH: 001F32000000
NAM: User Defined

Relative Speed; Front Axle, Left Wheel(MPH)
TXD: 00
RXF: 11FE02BF0000
RXD: 2808
MTH: 001F0320FFFB
NAM: User Defined

Relative Speed; Front Axle, Right Wheel(MPH)
TXD: 00
RXF: 11FE02BF0000
RXD: 3008
MTH: 001F0320FFFB
NAM: User Defined

Relative Speed; Rear Axle #1, Left Wheel(MPH)
TXD: 00
RXF: 11FE02BF0000
RXD: 3808
MTH: 001F0320FFFB
NAM: User Defined

Relative Speed; Rear Axle #1, Right Wheel(MPH)
TXD: 00
RXF: 11FE02BF0000
RXD: 4008
MTH: 001F0320FFFB
NAM: User Defined

Hydraulic Brake Pressure Circuit 1(PSI)
TXD: 00
RXF: 11FD02E60000
RXD: 1808
MTH: 001D00020000
NAM: User Defined

Hydraulic Brake Pressure Circuit 2(PSI)
TXD: 00
RXF: 11FD02E60000
RXD: 2008
MTH: 001D00020000
NAM: User Defined

Transmission Selected Gear(gear value)
TXD: 00
RXF: 11F002050000
RXD: 1808
MTH: 00010001FF83
NAM: User Defined

Transmission Actual Gear Ratio(Ratio)
TXD: 00
RXF: 11F002050000
RXD: 2010
MTH: 000103E80000
NAM: User Defined

Transmission Current Gear(gear value)
TXD: 00
RXF: 11F002050000
RXD: 3008
MTH: 00010001FF83
NAM: User Defined

Nominal Friction - Percent Torque(%)
TXD: 00
RXF: 11FE02DF0000
RXD: 1808
MTH: 00010001FF83
NAM: User Defined

Engine's Desired Operating Speed(rpm)
TXD: 00
RXF: 11FE02DF0000
RXD: 2010
MTH: 000100080000
NAM: User Defined

Engine Oil Pressure(PSI)
TXD: 00
RXF: 11FE02EF0000
RXD: 3008
MTH: 001D00320000
NAM: User Defined

Engine Coolant Level 1(%)
TXD: 00
RXF: 11FE02EF0000
RXD: 5008
MTH: 000200050000
NAM: User Defined

Engine Intake Manifold #1 Pressure(PSI)
TXD: 00
RXF: 11FE02F60000
RXD: 2008
MTH: 001D00640000
NAM: User Defined

Barometric Pressure(PSI)
TXD: 00
RXF: 11FE02F50000
RXD: 1808
MTH: 001D01900000
NAM: User Defined

Engine Intake Air Temperature(F)
TXD: 00
RXF: 11FE02F50000
RXD: 4008
MTH: 00090005FFD8
NAM: User Defined

Engine Oil Temperature 1(F)
TXD: 00
RXF: 11FE02EE0000
RXD: 2810
MTH: 000900A0FE35
NAM: User Defined

Transmission Oil Temperature 1(F)
TXD: 00
RXF: 11FE02F80000
RXD: 3810
MTH: 000900A0FE35
NAM: User Defined

Fuel Level 1(%)
TXD: 00
RXF: 11FE02FC0000
RXD: 2008
MTH: 000200050000
NAM: User Defined

Percent Exhaust Gas Recirculation Valve #1 Position (%)
TXD: 00
RXF: 011B00000000
RXD: 0808
MTH: 000200050000
NAM: EGR

Barometric Pressure (PSI)
TXD: 00
RXF: 016C80000000
RXD: 0808
MTH: 000A00100000
NAM: PSI

Injector Metering Rail #2 Pressure (PSI)
TXD: 00
RXF: 018180000000
RXD: 0810
MTH: 000100010000
NAM: IRP

Exhaust Back Pressure (PSI)
TXD: 00
RXF: 018300000000
RXD: 0810
MTH: 000104000000
NAM: EBP

Mass Air Flow (lb/min)
TXD: 00
RXF: 018400000000
RXD: 0810
MTH: 000700190000
NAM: MAF

Extended Range Fuel Delivery Pressure (Absolute) (PSI)
TXD: 00
RXF: 018780000000
RXD: 0810
MTH: 000100010000
NAM: XFP

Auxiliary Vacuum Pressure Reading (PSI)
TXD: 00
RXF: 018880000000
RXD: 0810
MTH: 000100010000
NAM: AVP

Auxiliary Gage Pressure Reading #1 (PSI)
TXD: 00
RXF: 018980000000
RXD: 0810
MTH: 000100010000
NAM: AGP

Engine Oil Temperature (Degrees Fahrenheit)
TXD: 00
RXF: 01AF00000000
RXD: 0810
MTH: 000100040000
NAM: EOT

Transmission Output Shaft Speed (RPM)
TXD: 00
RXF: 01BF00000000
RXD: 0810
MTH: 000100040000
NAM: TOS

Jeff

[Joshdmoore]

Jeff,

Hey thanks for all the great info. I have been looking at the scangauge D just had not ordered one yet. I will be ordering one soon.


Josh

[pwerwagn]

The muffler seemed to drop EGT about 50* or so. The max I can get it to with the TS turned all the way up is ~1175*. I didn’t notice much for power. Maybe a touch quicker spool.

Gonna try out some FICM tuning next and see what we can make happen there.

Jeff

[SlimTim]

Jeff (or anyone else) I pulled the water/methanol injection off of my 6400 SN if you are interested in it. I always used cold wether blue washer fluid in it as it would not freeze and cold weather washer fluid is mostly water and methanol and a very small amount of soap. When running the system the EGT temps were reduced by 50 to 100 deg. I took the system off my SN because I am doing some other mods to the engine and I no longer need the injection system.