Uprev Q&A

  #76  
Old 03-15-2019, 06:45 PM
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Hello Seymore4,

I have a 2008 G35S 6MT Sedan with 52,000 miles on it. I have had car since new. Last summer I installed 2.25" Fast Intentions cat back exhaust with 18" resonators. Ever since I have wondered if tuning would help optimize engine performance to better match new exhaust. Or should I just leave it alone? Car is otherwise stock and well maintained.

Reason I installed exhaust was I wanted a bit more engine noise so I could tell when to shift MT better, and hear what is going on with engine rpm when I let clutch out from a stop. With windows closed G35 sedan is so quiet, unless i am on the gas, I can't really hear the engine and know how to modulate clutch and when to shift. It definitely got louder. Probably because every component of exhaust I can see straight through! It does sound terrific though. Not sure what the neighbors think. Honestly, everyone that hears it (and that is in to cars) says it sounds fantastic. I agree, especially if I hold gears a bit longer and shift at higher rpm's. Not great for fuel economy but man, it puts a grin on my face . It is a bit too loud for my tastes though but it's installed and I'm not taking it off.

Let me know if tune would make noticeable improvement. Right now it sort of feels flat at low rpms and then runs good at higher revs. With such an open exhaust and reduced back pressure, I probably traded off some low end torque. Exhaust Pipe diameter is 2.25", not optional 2.5" diameter. I went smaller to try to keep low end and mid-range performance. This is my daily driver.

The other, probably largest contributing factor to making smooth shifting difficult, is super bad clutch pedal feel. For that I have RJM Performance adjustable fulcrum point clutch pedal I need to install this spring. This should make it a lot easier to shift and more relaxing to drive. I have tried all the other clutch pedal mods on this and other forums, with some improvement but none really address the root of the problem which is disengage to engage points in clutch pedal travel, are too close together, making it hard to modulate. I have been driving manuals my whole life and not until this car have I ever stalled so much. Over the years, I have learned to manage it but it is annoying.

Thanks.
 

Last edited by Roadtrip; 03-15-2019 at 07:04 PM.
  #77  
Old 03-15-2019, 08:32 PM
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A tune makes a difference on every G35, even stock ones.
 
  #78  
Old 03-17-2019, 11:32 PM
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OK. What equipment do I need? From reading, I believe I need an UprRev or Osiris(?) license, Install software on laptop. and a cable to connect laptop to car's OBD2 port. Once this is set up, record ECM data while driving. Then send data to tuner for analysis and adjustment?

Roughly how much am I looking at for equipment, software license and tune?
When recording ECM files, what should ambient conditions be ideally?
How does tune impact daily driving fuel economy?

I also see that one can switch maps using cruise control buttons. So one can switch from performance tune to stock tune to fuel economy tune to rev limiting launch mode. That's pretty slick.

Thanks
 
  #79  
Old 03-18-2019, 10:44 AM
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Originally Posted by Roadtrip View Post
OK. What equipment do I need? From reading, I believe I need an UprRev or Osiris(?) license, Install software on laptop. and a cable to connect laptop to car's OBD2 port. Once this is set up, record ECM data while driving. Then send data to tuner for analysis and adjustment?

Roughly how much am I looking at for equipment, software license and tune?
When recording ECM files, what should ambient conditions be ideally?
How does tune impact daily driving fuel economy?

I also see that one can switch maps using cruise control buttons. So one can switch from performance tune to stock tune to fuel economy tune to rev limiting launch mode. That's pretty slick.

Thanks
All you need is a windows laptop, the kit comes with a OBD2-USB cable you use to flash the ECU and datalog. In a nutshell the process is: Flash the base tune, record datalogs, flash updated tune, repeat until you're done. Cost is $550 for the basic kit, add $100 if you want the ARC upgrade (launch control, rolling anti lag, burnout mod). You should see a slight increase in fuel economy with a tune. Feel free to PM me if you have any other questions,
 
  #80  
Old 03-18-2019, 03:19 PM
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Seymore4,
OK. I'll follow up with you on PM. Thank you.
 
  #81  
Old 03-24-2019, 07:19 PM
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Coupe, Premium package, sport suspension
Question: 5AT with plenum spacer, Z-tube, grounding kit and tune. If a Transgo kit is installed, is a retune warranted?
 
  #82  
Old 03-24-2019, 07:44 PM
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Nope
 
  #83  
Old 03-24-2019, 10:24 PM
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Coupe, Premium package, sport suspension
Thanks!
 
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