Project G37S Transmission Upgrade Part 1 – Cooling Upgrades

CSF Radiator for Infiniti G37 Sedan Automatic

It is a little weird leading a transmission upgrade article for our Infiniti G37  with a CSF radiator picture, but stick with us for a couple minutes while we explain. When we first bought our automatic G37 it was a big change from driving manual transmission cars. The 7-speed slushbox designed to handle the daily grind of traffic was great at making gridlock bearable, but that’s all it excelled at. At about 65k miles we did a full transmission flush as part of the Infiniti premium service tier and had high hopes we would feel some improvement in the vagueness of our G37’s shifting. Unfortunately that was not the case. The one good thing that came out of getting the car serviced was that Infiniti provided us a new EX37 as a loaner. It would have been forgettable in every way except that it has the same engine and transmission combination as our project, but yet it shifted so much better! Shifts were quicker, downshifting was immediate and there wasn’t any noticeable lag when applying mid throttle accelerator input. It was clear the only way to remedy our problem was going to be by replacing the transmission.

Today we will be addressing a few additions to our G37 as we prepare for some transmission upgrades. Specifically, cooling and monitoring of our transmission’s temperature. Certainly, these items weren’t on our list when we started our hunt for crisper shifts, but we all know the rabbit holes our projects always tend to lead us through. Fortunately, the network of experts we’ve worked with on this project are sharing their knowledge and expertise to help us avoid calamity ahead of time.

We will be using this Autometer transmission temperature manifold (Part# 2286) to connect an Autometer transmission temperature gauge (Part#5658) so we can keep a close eye on our transmission’s fluid temps and compare the changes after some of our planned upgrades.

The biggest concern for our car was at times RPM’s would jump up between 2nd and 3rd gear shifts, indicating slipping. The team at UpRev that has been in charge of our G37’s tuning had reached out to inform us that they had made some improvements to their tune since the last time they had worked on our car. So with more horsepower and torque on the shelf we were going to have to address our car’s weak foundation for transmitting that power to the wheels ASAP. Increasing power without addressing our transmission slipping was only going to make things worse.

After talking to Omar at UpRev we decided to go with Level 10’s bulletproof 500hp transmission. It includes new clutches for the transmission, a improved valve body and an upgraded torque converter. UpRev will also be providing a custom transmission tune for it.

Which brings us back to the CSF radiator. Omar at UpRev also recommended changing the radiator to avoid any problems with the new transmission in case the transmission cooler in the radiator was corroding and potentially cross contaminating radiator fluid with transmission fluid.  The FSM (Factory Service Manual) procedure for cleaning the trans cooler looked like a real pain and with unknown maintenance prior to ownership, complete replacement was the best option. The Infiniti A/C condenser and radiator are a one-piece unit, so you can imagine what an extreme PITA that makes it to simply upgrade your radiator and not lose your A/C. Thankfully CSF makes an all aluminum performance radiator for our application which comes with a new A/C condenser.

The all aluminum  CSF radiator, part number CSF7011, is specifically for the automatic transmission G37 and 370Z. It has an integrated automatic transmission cooler and also comes with a removable A/C condenser. All the automatic transmission and A/C provisions for a plug and play installation are provided. The two-piece layout is a really useful feature as it will allow those of you that want to ditch your A/C condenser to increase air flow through the radiator core to do so.
Infinity Radiator upgrade with CSF
The  CSF all aluminum radiator is a beautiful piece of work.  Their 1 hour Show-Stopper mirror polishing process . It’s a shame all the welding beauty and polishing will be hidden behind the OE fans.  Take a minute to appreciate the craftsmanship with all those welds.

 

7 comments

  1. As somebody who used to be a Nissan tech that had to diagnose a G37X with the sport package added, leading an article with a radiator pic doesn’t confuse me in the slightest 😛

    1. That being said, my Snap-On Modis Ultra can read the factory trans temp datastream faster than it takes for the OEM Nissan CONSULT3+ scantool to even manage to connect to the the ECU and allow you to choose which PID data to display on it, but I daresay that sending unit is a damned sight cheaper than a Modis Ultra. Kind of surprised UpRev doesn’t have any means of reading PID data via a connected PC?

      1. When I asked Up-Rev about it they said the data for the transmission temps was encrypted but I assume all the data is encrypted but then you have to find what’s what and map the values. UpRev does have the oil temp because in part 2 when we had the car on the dyno it was going up pretty high 😀 before we had to stop tuning to let the temps drop. It seems the car needs all sorts of help in the cooling department if your doing anything beyond a normal commute and occasional stoplight or freeway onramp blast.

    1. Can only speak from our experiences, but our 370Z Project had the CSF radiator/condenser combo for a year and a half without a single issue. It was then outfitted with the CSF triple-pass radiator and that has been on the car since 2014 – also with zero issues. Here are the links to those articles:

      https://motoiq.com/project-nissan-370z-keeping-it-cool-with-a-csf-radiator-hps-hoses-and-a-nissan-motorsports-oil-cooler/

      https://motoiq.com/project-370z-heated-battle-testing-the-csf-triple-pass-radiator/

  2. To measure the volume difference between the radiators, you could have plugged one end of each radiator, filled it up with water(measured) and compared.

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