One scientist remembered a strange titanium alloy Titleist used in a limited-run series of drivers years earlier that held up remarkably well under duress. The scientist suspected the alloy, called ATI 425, could be strong enough to solve the engineering issue.
“ATI 425 is a tougher material. It wants to come back to form and it does that in concert with higher strength,” Luttrell says. “It allowed us to leverage these really aggressive face insert designs that increased ball speed potential.”
A series of tests confirmed what the R&D team suspected: ATI 425 was a perfect fit. Titleist had created its fastest driver ever just by changing its components.
“Overall, this is the best line of metalwoods we’ve ever made,” Luttrell says. “The tagline we use with TSi is ‘faster, longer, straighter,’ and it absolutely lives up to that.”
Today, Titleist sells four TSi drivers and fairway woods and three TSi hybrids. There’s an offering for Tour-speed players (the TSi4), slower-swinging players (TSi1), distance junkies (TSi2), control freaks (TSi3)—and just about every type of golfer in between.
“We’ve been living under kind of this cloud of ‘serious clubs for serious golfers’ for many,many years,” Luttrell says. “I hope we can get that monkey off our back because we have an incredible line of metalwoods, and there’s something in it for everyone.”
It’s true, Titleist admits, you won’t find anything in golf quite like the TSi. But don’t take NASA’s word for it.
“I would say to anyone, ‘Hey, go get fit,’” Talge suggests. “Don’t believe the two people who work for Titleist. Go play this driver, go do a fitting and let the numbers speak for themselves. I think both Steph and I are pretty confident you’re gonna walk out with a TSi.” — James Colgan
Titleist TSi1/2/3/4 Review
We tested: TSi1: 9˚,10˚, 12˚; TSi2: 8˚, 9˚, 10˚, 11˚; TSi3: 8˚, 9˚, 10˚, 11˚; TSi4: 8˚, 9˚, 10˚
Our take: Hiding under the bed at this year’s ClubTest was one of the scariest offerings in golf: Titleist’s high-flying TSi family of drivers. It’d be easy to overlook the TSi — which found its way into the top performers of last year’s ClubTest — among the shinier options available in 2022. Not to our Testers, though. “It’s the hottest driver I’ve tested,” one raved of the TSi2. “The ball moves downrange with gusto. I could tell after a few swings it was an absolute monster.” Spine-chilling speed gains have helped to make the TSi one of the most popular drivers in golf. And with four distinct options, there’s a choice for everybody — the TSi1, for mid-speed players; TSi2, for max distance; TSi3, for added ball control; and TSi4, for high-speed, low-spin aficionados. (Night lights sold separately.)
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Robot’s take: TSi1: The lightweight TSi1 had the highest launch in the TSi family of drivers, making it the ideal choice for golfers with moderate swing speeds who need a boost in trajectory and overall distance; TSi2: TSi2 had medium/high draw launch with low-spin ballflight, making it best suited for players wanting maximum distance and forgiveness across the clubface; TSi3: TSi3 had exceptional ¾-inch toe and heel distance dropoff. It’s a solid choice for players who want distance and consistency on both pure and off-center hits; TSi4: TSi4 had a medium/high launch with the lowest spin rates in the TSi family, cementing its status as the player’s option for more distance and shotmaking versatility.
The details: Titleist soared onto the scene (quite literally) with the introduction of the TSi2 and TSi3 drivers in early 2021, scoring out as two of the highest-performing models in the class. Then came the TSi1 and TSi4, which were quickly adopted by the likes of World No. 1 Nelly Korda and major champ Adam Scott, respectively. The star of the TSi line is the scorching-hot ATI 425 face, which is made from a type of aerospace-grade titanium originally developed for military use. Not only does ATI 425 help to produce faster ballspeeds and longer drives, it also helps to tighten dispersions on off-center hits. And, if that won’t do it for you, the TSi’s unique head design helps to reduce drag and improve launch conditions.
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