If you've spent any time looking at dyno sheets lately, you've probably seen the 6266 gen 2 popping up everywhere as the go-to choice for mid-sized builds. It's one of those parts that actually lives up to the hype, which is pretty rare in the car world where everyone claims their product is a "game changer." When Precision Turbo released the second generation of this 62mm beast, they weren't just slapping a new sticker on an old housing; they actually reworked the internals to solve that age-old struggle of wanting massive power without waiting forever for the boost to kick in.
Why Everyone is Talking About the Gen 2
The magic of the 6266 gen 2 really comes down to the aerodynamics. Precision uses what they call CEA (Competition Engineered Aerodynamics), and while that sounds like a fancy marketing buzzword, it translates to a compressor wheel machined from a solid 2618-aluminum forging. Because it's machined rather than cast, the blades can be thinner and more aggressive.
The result? You get a wheel that's lighter and flows more air than the Gen 1 version. If you're trying to push an engine to that 800-horsepower mark, the Gen 2 is much more comfortable doing it. It doesn't feel like it's gasping for air at the top of the rev range. Instead, it just keeps pulling. It's honestly impressive how much air this relatively small frame turbo can move.
Comparing the Gen 1 vs the Gen 2
I get asked a lot if it's actually worth the extra cash to go for the Gen 2 over a used Gen 1 or a cheaper alternative. Here's the deal: the Gen 1 was a legend in its own right, but it had its limits. The 6266 gen 2 features an updated turbine wheel design too, not just the compressor side. This helps with backpressure, which is the silent killer of high-horsepower small engines.
When you reduce backpressure, the engine breathes better, runs cooler, and—most importantly—is less likely to knock. So, you aren't just getting more power; you're getting a wider "efficiency window." You can run more boost more safely. If you're building something like a 2JZ or an RB26, that extra breathing room is the difference between a reliable street car and a paperweight with a hole in the block.
The Spool Factor
We have to talk about lag, because that's the first thing people worry about with a turbo rated for 800hp. Nobody wants a car that feels like a naturally aspirated 1.8L until 5,500 RPM and then suddenly tries to kill you. The 6266 gen 2 is surprisingly snappy. Because it's almost exclusively sold as a ball-bearing unit (though journal bearing versions exist for some older models), the transient response is crisp.
If you're cruising in third gear and you roll onto the throttle, the boost builds linearly. It's not an "on-off" switch. It feels more like a very large, very angry engine is living under your hood. For a street car, that's exactly what you want. You want to be able to pass someone on the highway without having to drop three gears just to get the turbo spinning.
Real World Power Expectations
Let's talk numbers for a second, because that's why we're all here. Precision rates the 6266 gen 2 at around 800 horsepower. Now, keep in mind that's "crank" horsepower in a perfect world on a high-reading dyno. In the real world, on a solid 4-cylinder or 6-cylinder setup with E85, you're looking at somewhere between 650 to 750 wheel horsepower.
That is a lot of power for a street car. In a car like an Evo or an STI, 700whp is enough to make you reconsider your life choices. In a Supra or an R34, it's the perfect "fast street" setup that can still hold its own at the drag strip or a half-mile event.
Housing Options Matter
One thing people often overlook when buying a 6266 gen 2 is the exhaust housing. You've got options like T3, T4, and V-band, with different A/R ratios. If you go with a tiny .82 A/R T3 housing, you'll get instant spool, but you'll choke the top end. If you go with a massive T4 1.12 A/R, you'll make huge peak numbers, but the car might feel lazy on the street.
Most people find the "sweet spot" with a .82 or .96 A/R V-band or T4 housing. It balances the flow and the response perfectly. Honestly, unless you're building a dedicated drag car, don't over-size your housing. It ruins the fun of the Gen 2's responsiveness.
What You Need to Support This Turbo
You can't just bolt a 6266 gen 2 onto a stock motor and hope for the best. Well, you can, but it'll be a short-lived experiment. To really let this turbo shine, you need the supporting cast to be on point.
- Fueling: You're going to need massive injectors. We're talking 1300cc at the bare minimum, but 1700cc or 2000cc is better if you're running E85. You'll also need at least two high-flow fuel pumps (like Walbro 450s or 525s).
- Wastegates: Don't cheap out here. A 44mm or 46mm gate is usually enough, but make sure your manifold design allows for good priority so you don't deal with boost creep.
- Engine Internals: Most stock bottom ends are going to complain (loudly) at 700hp. Forged pistons and rods are basically mandatory if you want to sleep at night.
- Oil Management: Precision turbos are sensitive to oil pressure. You'll want to make sure you're using the right restrictor (if required) and that your drain line is downhill and kink-free. Nothing ruins a 6266 gen 2 faster than oil backing up into the seals.
The Driving Experience
Driving a car equipped with a 6266 gen 2 is a bit of an addictive experience. There's a specific sound it makes—a high-pitched whistle that starts early and turns into a full-on jet engine roar as you climb past 20psi.
What's really cool is how it handles gear shifts. In a manual car, if you're quick on the shifts, the turbo stays in the power band effortlessly. You don't get that "falling off a cliff" feeling where you have to wait for the boost to recover. It's just relentless forward momentum. It's the kind of setup that makes you want to take the long way home just so you can find a clear on-ramp.
Is It the Right Choice for You?
Now, I'll be the first to admit that the 6266 gen 2 isn't for everyone. If your goal is only 400 horsepower, this turbo is way too big. You'll just be dealing with unnecessary lag. On the flip side, if you're trying to build a 1,200hp track monster, you'll want to look at its bigger brother, the 6870 or the 7675.
But for that "Goldilocks" zone—the 600 to 800hp range—it's hard to find anything better. It's small enough to fit in tight engine bays where a large-frame turbo wouldn't stand a chance, yet it packs enough of a punch to embarrass supercars at the local roll-race event.
Final Thoughts
At the end of the day, the 6266 gen 2 remains a staple in the tuning community for a reason. It's reliable, it's proven, and the power-to-size ratio is just ridiculous. Precision really nailed the balance with this one. Whether you're building a rowdy street car, a drift missile, or a weekend drag racer, it's a solid investment that won't leave you wishing you'd gone bigger.
Just make sure you've got the tires to handle it, because once that boost hits in second gear, things happen very quickly. It's a wild ride, and honestly, that's exactly what a modified car should be. If you're on the fence, just do it. You won't regret the first time you feel that Gen 2 technology doing its thing at full tilt.