Here is a scenario every tuner has watched play out.
A customer makes a big number on the dyno. Everyone is thrilled. Then he takes the car to a roll race or a track day, makes one good pull, and every pull after that is slower. He blames the tune. He blames the fuel. He blames the tuner.
It is almost always the intercooler.
What heat soak actually does
When a turbo compresses air, it heats it. That is not a flaw, it is physics. The intercooler's entire job is to take that hot compressed air and cool it back down before it goes into the engine.
Cooler air is denser air. Denser air means more oxygen per cubic inch, which means more fuel can be burned, which means more power. Cooler air also resists detonation, which is the thing that actually destroys engines.
An undersized intercooler works fine for one pull. The core absorbs the heat, the charge air comes out cool, the car makes its number. But the core is now hot, and it has nowhere to put that heat. On the next pull, it cannot absorb any more, so hot air goes straight into the engine. The tune pulls timing to protect itself. You lose power.
That is heat soak. Your car did not get slower. Your intercooler gave up.
The stock intercooler is not the problem you think it is
The factory R35 intercooler is actually a decent piece for a factory car. It is just not built for what people do to these cars. Once you are running an upgraded turbo kit and chasing four figures, it is comprehensively out of its depth.
Which Boost Logic core do you need?
Street Intercooler: up to 1000HP
The Street Intercooler is 1000HP-ready and uses a factory-style vertical flow design for low pressure drop. It packs the largest core that still fits within stock ducting, which means it goes in cleanly without cutting up the front of your car.
Available with a black heat dissipation coating. If your GT-R is a street car living at or below 1000HP, this is the correct answer and you can stop reading this section.
Race Intercooler: high boost, high power
The Race Intercooler steps up to a 14 x 22.5 x 4.5-inch custom tight-fin core with lightweight aluminum end tanks. Available in 2.75-inch (stock piping size) or 3-inch inlets, with or without the heat dissipation coating.
The 3-inch option matters: if you are running larger charge piping, matching the intercooler inlets to it removes a restriction you would otherwise be building in on purpose.
Ultimate Race Intercooler: 2000whp+
The Ultimate Race Intercooler is Boost Logic's largest GT-R cooler. Garrett core, 3-inch Vanjen inlets and outlets, rated to handle over 2000whp.
Note the Vanjen clamp ends. At the boost levels this core is designed for, a conventional coupler and T-bolt clamp will eventually blow off. Vanjen connections will not. This is not a luxury at 2000whp, it is the difference between finishing a pass and coasting back to the pits.
HYPERCORE 4000: the extreme build answer
The HYPERCORE 4000 is an intercooler system engineered for front-mount turbo setups running a rear-mounted radiator, and it can also be integrated into stock-location turbo setups. If you are building the kind of car where the radiator has moved, you already know who you are.
The intercooler is only half the job
People spend serious money on a core and then feed it through tired stock piping with rubber couplers. That is a mistake in two ways.
Flow. A restriction anywhere in the charge path is a restriction. Full titanium intercooler piping fits the Street, Race and Ultimate cores, in raw or burnt blue.
Connections. This is the one that ends runs. Under real boost, couplers blow off. Boost Logic titanium S pipes and U pipes use an extra-thick beadroll specifically to keep couplers in place under high boost. And Vanjen clamp kits in 2.5, 3 and 3.5-inch give you connections that simply do not come apart.
Blowing a boost pipe at 30 psi is not just an annoyance. It is a lean condition on a very expensive engine.
How to tell if you are already heat soaking
You do not need a lab. Look for these:
- The first pull of the day is always the best pull of the day.
- Back-to-back pulls get progressively slower.
- Your intake air temps climb and stay climbed.
- The car feels great on a cold night and mediocre in traffic on a hot afternoon.
If any of that sounds like your car, the tune is probably fine. The core is not.
The short answer
Up to 1000HP, street car: Street Intercooler. Fits stock ducting, done.
Above 1000HP or serious track use: Race Intercooler, matched to your piping size.
1500whp and up: Ultimate Race, and run Vanjen connections everywhere.
Browse all R35 GT-R intercoolers → or see the full induction range →