Community Member Credit: Josh Go Hard Neal
my4dsc.com is officially 5yrs old today. In a new age of Facebook groups and dying forums, my4dsc.com is the # Nissan Maxima source in existence growing by the day. Thanks for all the love and support. Stay tuned for official decals and merch coming soon on the website.
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F) sensor 1. This feedback signal is then sent to the Engine Control Module (ECM). The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is then computed in terms of “injection pulse duration” to automatically compensate for the difference between the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical value. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences, wear over time and changes in the usage environment.
Instructions
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF.
- Disconnect mass air flow sensor harness connector, and restart and run engine for at least 3 seconds at idle speed.
- Stop engine and reconnect mass air flow sensor harness connector.
- Make sure Detected Trouble Code (DTC) P0102 is displayed.
- Erase the DTC memory. (This could be done by disconnecting the car battery for 30-45 min or with a scanner)
- Make sure no codes are stored in the ECM.
- Run engine for at least 10 minutes at idle speed.
This is the OEM Exhaust Manifold Stud and nut found in the cylinder head of all VQ35DE engines.
Exhaust Stud
- Part Number: 14064-31U0C
- Price: $1.61
- Order Link: https://www.quirkparts.com/oem-parts/nissan-exhaust-manifold-stud-1406431u0c
Exhaust Nut
- Part Number: 14094-9BA0A
- Price: $1.15
- Order Link: https://www.quirkparts.com/oem-parts/nissan-mnfd-w-converter-nut-140949ba0a
Community Member Credit: Rico Rodriguez
Big shout to Rico for spending countless hours in finding a cost-effective solution to coilpacks for the VQ35DE engine. This also works on other models and years.
For those that don’t know, Audi coilpacks are stronger and better than Nissan coilpacks. They add better mpg and more HP/TQ. It works on bone stock vehicles or highly modified vehicles. Just rewire the OEM pigtails to Audi pigtails, plug it in and play!
Nissan Coilpack only has 1 coil. Audi has 2 coils as you can see in the picture below. By having 2 coils it doubles the spark output and can easily handle spark blow out that turbocharged vehicles suffer from. Because it’s outer exterior has a metal body it can dissipate heat ALOT quicker than Nissan rubber which helps with heat cycling. It’s also cheaper than OEM Nissan Coilpacks.
Audi R8 Coil Pack Advantages:
- 50,000 volts compared to Nissans/Infiniti 30,000 volts.
- Some measure it with Kv so Nissans coils put out 21Kv while VW coils put out 30Kv
- Quicker Heat dissipation. (Because of its metal body construction it can quickly dissipate heat. Nissan OEM body is made out of rubber that isolates heat instead of disperses it.)
- More complete burn of the fuel mixture compared to OEM Nissan which equals to better MPG.
- Idle Stability Improved
- NO CEL (Check Engine Lights)
- BEST PART ABOUT THEM IS THEY ARE CHEAPER $$$ than Nissan OEM yet they are much better.
- Looks 10000% Cooler than OEM Coilpacks
Now the coil packs price varies due to different name brands. They range from $132-$216 for a V6 engine. Below is the link of the coil packs below so you can see the prices and brands. Doesn’t matter which brand you use, I’ve tested them all and they all make the same exact power.
Order Link: https://www.nedautoparts.com/search?q=Audi+coilpack
Reference Photos
Installed a 2003 Nissan Maxima (Credit: Altaf Rahaman)
Important Note: The 02-08 DE Manifold requires NWP spacers.
Important Note: The 2nd Gen Engine does not require spacers. Straight plug-n-play.
Adaptor Options:
You can also purchase the adapters directly from Rico. Below are the prices.
Create Connectors using O2 Plugs (Credit: Rob Tilley)
Finally got my R8 coils installed today and I must say it was definitely worth the time and money I spent. I installed them on my turbo 350z running 15psi with #7 plugs. Car runs so much smoother, especially under boost. It’s a totally different car. I used o2 plugs from a 02/03 Maxima to make the adapters for the plug. Just have to file down the alignment guide on the outside of the blue connector.
Make your Own Clean Connectors using new Plugs: https://www.my4dsc.com/audi-r8-coilpacks-installed-on-nissan-maxima-vq35de-make-your-own-plug-n-play-connectors/
If you’re splicing directly (Courtesy of Jerome Fenwick)
Nissan OEM Coilpack vs Audi R8 Price Difference (Courtesy of EddyMaxx)
Community Member Credit: Eddy
If you are looking to upgrade your Maxima with Akebono’s then check out the deal below at Autozone. You can get both calipers for $200.00 bucks. You can exchange your previous calipers to save the core charge. These calipers work great and are just like the original OEM ones.
Front Driver Side Part Number: 97S00635A
Front Passenger Side Part Number: 97S00635AB
Depending on the Maxima year, you will also need the following:
- Caliper Brackets (5thgen/6thgen – 7thgen Plug-n-Play)
- Front Left/Right 13.9 Rotors ($115.00) | Order Link
- Stainless Steel Brake Lines (Recommended)
- 2x Banjo Bolts ($6.00) | Order Link
- Akebono Decals
Vehicle Fitment:
- FX50 2009-2013
- G37 2008-2013
- M35 2012-2013
- M37 2011-2013
- M56 2011-2013
- Q50 2014-2019
- Q60 2014-2015, 2017-2021
- Q70 2014-2019
- QX70 2014
- 350Z 2009
- 370Z 2009-2019
Owner: Cee Jay Pirrotta
Year: 1996
Model: Maxima
Current Color: Black
Engine: VQ35DE 3.0 Timing
Transmission: 5-Speed Manual
Trim: GXE
Highlights
- 492 WHP / 464 TQ at 13psi on Haltech (Tuned by Moncef @ AdminTuning) 10/9/2021
Video
This is just a quick guide for those upgrading to R35 GTR injectors. They are many fakes out there in the market. While some have had success with the fakes, the majority have experienced issues. These injectors are most commonly used for running E85 on Nissan Maxima builds.
Your best chance is to buy them used from someone who can verify they are genuine. However, if you ever plan to boost the car, it doesn’t make sense to buy the GTR injectors new because for about the same price you can get a set of new Injector Dynamics injectors that are good for more fuel delivery.
The real/authentic injector is on the left. The fake/knock-off injector is on the right.
Additional Video Reference