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SpaceX CEO Elon Musk teases nine-engine Starship, Raptor upgrades

CEO Elon Musk has some thoughts about the future of Starship, Super Heavy, and their shared Raptor engines. (SpaceX)

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In his latest round of SpaceX-related tweets, CEO Elon Musk says that the company has plans to boost Raptor’s performance by at least 15% and the number of those engines installed on Starship by 50%.

Those updated goals came hand in hand with significant changes to the design and operation of both Starship and its Super Heavy booster, which at one point was expected to utilize a “Boost” variant of Raptor that would trade thrust vector control (TVC; i.e. gimballing) and a wide throttle range for far greater thrust. At least according to Musk’s latest account, that substantially different “Raptor Boost” variant is now no more.

On July 3rd, NASASpaceflight forum member and photographer BocaChicaGal captured photos of SpaceX delivering three new Raptor engines to its Boca Chica Starship factory. Two of those engines (RB3 and RB4) featured Raptor Boost labels and were likely the first engines of their kind to complete qualification testing in McGregor, Texas. As of their arrival in South Texas, it was assumed that Raptor Boost still represented a variant of the engine with almost 50% more thrust at the cost of gimbal and throttle authority.

However, Musk himself replied to some of the resulting tweets later that evening, revealing that Super Heavy’s outer ring of up to 20 “Raptor Boost” engines would indeed have no ability to gimbal but would still be able to throttle.

Later the same day, the SpaceX CEO clarified further, stating that the company now plans to upgrade Raptor’s existing design to boost engine thrust to ~230 tons (~510,000 lbf) while still maintaining a wide throttle range and optional thrust vector control. With such an engine, “all Raptors on [a Super Heavy] booster, whether fixed or gimbaling, would be the same.” The only unique aspect of “Raptor Boost,” then, would be their installation around the inner ‘ring’ of Super Heavy’s skirt and their resulting lack of gimbal authority.

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It’s somewhat unclear, then, why two of the engines SpaceX delivered on July 3rd were labeled “RB#” and one explicitly outfitted with a name tag reading “Hello, my name is Boost.” Notably, a quick side-by-side comparison enabled by those photos strongly implies that Raptor Booster engine 3 (RB3) and Raptor 79 (R79) are virtually identical aside from RB3’s rerouted plumbing and unique mounting hardpoints. In other words, barring surprises, the “boost” nomenclature appears to be more vestigial than anything.

Ultimately, as Musk notes, if SpaceX manages to boost “Raptor 2” to 230 tons of thrust, a Super Heavy booster with 33 mostly identical engines would have a peak liftoff thrust around 7600 tons (~16.8 million lbf), translating to a thrust to weight ratio of more than 1.5. For a large rocket with liquid propulsion only, a TWR greater than 1.5 is very respectable and improves acceleration off the launch pad, reduces gravity losses in the first few minutes of ascent, and thus boosts overall efficiency.

Already, Musk’s implication that 33 engines could ultimately be installed on Super Heavy is a departure from comments the CEO made barely a month ago when he revealed a base increase from 28 to 29 engines with the possibility of expanding to 32 down the road. Also new is the implication that SpaceX is considering adding three more vacuum-optimized engines to Starship’s six planned Raptors, leaving ships with six Raptor Vacuum (RVac) engines and three sea level-optimized engines (the same variant on Super Heavy).

Musk says that SpaceX has yet to decide if Raptor Vacuum will be commonized with Raptor 2, boosting its thrust, or if greater efficiency will be pursued instead. Regardless, even with six 200-ton-thrust RVacs and three Raptor 2s, Starship would produce upwards of 2000 tons of thrust in vacuum, creating an upper stage with almost as much thrust as Falcon Heavy and a fully-fueled thrust to weight ratio of ~1.7 – even better than Super Heavy.

Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Why Tesla’s Q4 performance could shock many after incredible Q3

There is still some residual impact to be felt as we enter Q4, and there is a potential shock coming to many investors as it could be stronger than what many think:

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Credit: Tesla

Tesla reported vehicle deliveries and energy deployments for the third quarter of 2025 today, blowing analyst estimations from Wall Street firms completely out of the water with its strongest three-month performance in company history.

The strong performance, which resulted in nearly half a million vehicle deliveries in the quarter, was largely driven by the momentum of the EV tax credit, which expired at the end of September, marking the end of the $7,500 discount that was previously available.

Tesla hits record vehicle deliveries and energy deployments in Q3 2025

This was a massive contributor to Tesla’s record-high in vehicle deliveries, as consumers rushed to take advantage of the credit.

There is still some residual impact to be felt as we enter Q4, and there is a potential shock coming to many investors as it could be stronger than what many think:

EV Tax Credit Deliveries Will Continue Through Q4

Despite the credit’s expiration, people will still be able to take advantage of it because the IRS changed the rules mid-quarter.

Prospective buyers can utilize the credit after September 30 if they place an order for an EV and make a marginal payment on the car.

Tesla’s $250 order deposit qualified as the marginal payment, so as long as the order was submitted before the end of the day on September 30, they could still take delivery in Q4 or even Q1 and still take advantage of the credit.

Tesla set to win big after IRS adjusts EV tax credit rules

With the Model Y Performance launching in the U.S. on September 30, that undoubtedly contributed to some orders. However, there are likely many people who ordered in the latter portion of Q3 and have not yet taken delivery. These will all contribute to Q4 delivery figures.

Seasonal Holiday Boost

Tesla traditionally has its strongest quarters in Q4, as the company typically introduces initiatives such as price cuts, incentives, and other offers to close out the year strong.

Car buyers are more likely to jump at these offers as well, as gifts for either themselves or others. What Tesla does in the final quarter of the year is usually boosted by whatever types of offers it can make.

Affordable Model Production Ramp

Tesla is likely preparing for the launch of its affordable model, which is essentially a stripped-down Model Y.

Some rumors have been circulating within the community, indicating that the company is nearing the sale of this vehicle, which is coded within Tesla’s website as the “Model Y Standard.”

If Tesla is able to lock in some good pricing on its affordable model, Tesla could see its quarterly figures return to QoQ growth, something that the company has not had in a few years.

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Tesla hits record vehicle deliveries and energy deployments in Q3 2025

As per Tesla’s Q3 2025 vehicle delivery and production report, the bulk of the company’s numbers came from its mass-market lineup.

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Tesla (NASDAQ:TSLA) reported record-breaking results for the third quarter of 2025, producing 447,450 vehicles and delivering 497,099 units worldwide. 

The company also deployed 12.5 GWh of energy storage products, setting a new record in its fast-growing energy business.

Model 3/Y domination

As per Tesla’s Q3 2025 vehicle delivery and production report, the bulk of the company’s numbers came from its mass-market lineup. The Model 3 sedan and Model Y crossover accounted for 435,826 units produced and 481,166 delivered in the quarter. This is quite impressive considering that both the Model 3 and Model Y are still premium-priced vehicles with numerous competitors that are significantly more affordable.

Other models, including the Model S, Model X, and Cybertruck, contributed 11,624 vehicles produced and 15,933 delivered. Beyond vehicles, Tesla’s energy business posted its best quarter to date, deploying 12.5 GWh of storage systems.

Credit: Tesla

Q3 2025 earnings call date

Tesla’s third-quarter results are extremely impressive, and they exceed Wall Street’s estimates by a significant margin. As per Benchmark analyst Mickey Legg, who had a delivery estimate of 442,000 vehicles in Q3, Wall Street consensus was at 448,000 units. Even more optimistic analysts estimated that Tesla would only post deliveries in the mid-460,000s.

Investors will gain further insight later this month when Tesla reports full financials for the quarter. The company will release Q3 2025 earnings after market close on October 22, followed by a Q&A webcast at 4:30 p.m. Central Time.

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Elon Musk

Elon Musk is halfway towards becoming the world’s first trillionaire

Musk’s fortune remains heavily tied to Tesla, which has rallied nearly 100% since April.

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Credit: Tesla Manufacturing/X

Elon Musk has reached a new milestone by becoming the first individual in history to achieve a net worth of $500 billion. ForbesReal-Time Billionaires tracker confirmed the record Wednesday afternoon after Tesla stock gained nearly 4%, adding an estimated $9.3 billion to Musk’s net worth in a single day. 

He now sits more than $150 billion ahead of Oracle co-founder Larry Ellison, whose net worth also stands at a very impressive $350 billion.

Tesla stock leads wealth surge

Musk’s fortune remains heavily tied to Tesla, which has rallied nearly 100% since April, when the CEO announced he would step back from outside roles to focus more on the EV maker. The company’s market capitalization is back within 10% of its all-time peak, lifting the value of Musk’s 12% stake to about $191 billion. 

Beyond this, his 2018 compensation package, which was rescinded by a Delaware judge last year but is still under appeal, could unlock additional stock worth more than $130 billion if reinstated, Forbes noted. Investors see Musk’s refocused leadership as a stabilizing force for Tesla as it pursues ambitious global growth. Tesla has also proposed a new compensation plan for Musk that could bring the company’s market cap to $8.5 trillion and add an additional $900 billion to the CEO’s net worth. 

SpaceX and xAI boost portfolio value

While Tesla drives much of his wealth, Musk’s stakes in SpaceX and xAI have added significant upside to his net worth. SpaceX, his private rocket company, recently hit a $400 billion valuation in a private tender offer, valuing Musk’s 42% stake at $168 billion. Meanwhile, xAI Holdings, which merged with social platform X earlier this year, is worth an estimated $113 billion, giving Musk another $60 billion on paper. 

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These ventures, combined with Tesla’s resurgence, have pushed Musk’s net worth past the half-trillion-dollar mark and highlighted his reach across multiple industries, from clean energy to space, artificial intelligence, brain implants, and tunneling.

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