Skip to main content

Hennessey Is Building an 800 hp McLaren 600LT

The McLaren Senna is not just about horsepower, of course. There's a lot more that goes into it and you can read all about it here where I compare it to a Dodge Viper ACR (they're MUCH closer than you think). But if you've got your heart set on an 800 hp McLaren and you missed out on the Senna, Hennessey is happy to oblige.

If you aren't familiar with Hennessey, it is an aftermarket tuning company based in Texas that is no stranger to American cars like Corvettes, Camaros, Mustangs, and Challengers, and even tunes some trucks and SUVs. Hennessey also is a bit of a "boutique manufacturer". Its last car - the Venom GT - set multiple world speed records (some unofficial) and it was based on a Lotus Elise chassis with a modified twin-turbocharged version of the LS7 7.0 litre V8 in the C6 Chevrolet Corvette Z06.

In Hennessey speak, HPE800 typically means it will make at least 800 hp. Their HPE800 Camaro SS makes 804 hp. Their HPE800 Cadillac CTS-V makes 830 hp. Their HPE800 Mustang GT makes 808 hp. You get the picture. Now, they've announced that they will be building a modified version of the McLaren 600LT to be called the HPE800 which means that, in all likelihood, it will have more than 800 hp. That would put it above McLaren's own Super Series 720S with 710 hp and even the Ultimate Series Senna with 789 hp.

No details have been announced but this isn't the first time Hennessey has modified a McLaren. They previously took a McLaren's MP4-12C and offered an HPE800 version which had "over 800 hp." To reach that figure, Hennessey upgraded the intercooler, intake, and fueling system (likely injectors and pumps) and it added in their own titanium exhaust, engine computer, and new ball-bearing turbos. Other upgrades included external wastegates and blow-off valves, upgraded transmission cooler and clutches, and custom wheels and functional exterior aerodynamic bits.

Chances are, most of the engine modifications will carry over. The 600LT makes 592 hp (600 PS) and the MP4-12C made the exact same 592 hp out of the same McLaren twin-turbo 3.8 litre V8. Judging by the photos released, though, it doesn't look like Hennessey changed much (or anything) of the exterior, including even the wheels, but maybe Hennessey is keeping all changes under wraps and just hinting at the potential with the HPE800 moniker. Only time will tell.

Performance should at least match, if not exceed, the 720S. When tested by Car and Driver, the 720S did 0-60 mph in 2.7 seconds and 1/4 mile in 10.2 seconds at 145 mph. Pricing and release date haven't been announced yet so we'll have to wait and see. Keep in mind, though, that an HPE800 package for a relatively humble Corvette costs $55,000 USD, so this won't be cheap, but it will most certainly be a fraction of the price of the Senna, which was £750,000/$837,000 USD. But, as with every large aftermarket tuner, Hennessey offers their own warranty on their packages so there should at least be some peace of mind that comes with that.

Follow Ram's Eye The Track Guy on Facebook and Instagram!


Does An Aftermarket Grille Really Increase Airflow?
I put a Saleen S281 grille to the test to answer that question.

Stock Suspension S197 Mustang With Square 305/30/19's
What you need to fit a proper size square tire setup.

How Limited Slip Diffs Make You Faster on Track
What you need to know about how they put power down and pros and cons.

Can Telemetry Explain Schumacher's Talent?
A comparison between Schumacher's and then team mate Herbert's data.

Cayman GT4 Track Review
The first Cayman with proper (911-challenging) power.

Is an EcoBoost Mustang any good on Track?
Two days at the track in a Mustang short 4 cylinders.

2016 BMW M4 DCT Track Review
It's quick (properly quick). But is it fun?

Can a stock Golf Diesel handle a Track Day?
Not your every day track beater.

🔥 Most Visited This Week

Michelin Pilot Super Sports vs Firestone Firehawk Indy 500 - Street Review

I've been a huge fan of Michelin PSS tires and exclusively bought them for the Mustang over the last four years. So how did I end up here? This year, I was hugely interested in trying an "R-comp" tire. I had my eyes set on Bridgestone Potenza RE-71R's for two simple reasons: price and reputation. Although not a true "R-comp" tire on paper, it performs like one by the account of every single test and review I've read (down to wear rates...). They seem like they're easily the most affordable (from a big brand) R-comp tire and combine that with a reputation for having tons of grip, it was an easy top contender. I had my concerns, though. For one, I'm told and have read that they are an autox tire, not really designed for high speed, pressure, and temps associated with open track. For another, the Mustang is a heavy car (as far as track cars are concerned) being roughly 3,800 lb. (including driver), which will amplify the unwanted open track load

Michelin PSS vs Firestone Indy 500 - Track Review

A couple of weeks ago, I posted my first impressions of Michelin's PSS vs Firestone Firehawk Indy 500 tires. I've run PSS's for several years on the Boss, but I'm trying the Indy 500's for the first time. In short, I was worried about the narrower tires (I was running 285/35/18 PSS but could only find the Indy 500 in 275/35/18) and tread squirm, but I was happy with them up to that point just driving on the street. I had the chance to drive on them for three track days now. So what were they like? After my first session, they made an impression that basically persisted for the rest of track sessions on them. Phenomenal, unmatched value. Now, if value is something that stands out above all else, it typically means the compromise between qualities you want and those you don't is less than ideal, but the value is attractive. This is no different. I'll start with the bad, which really boil down to two: ultimate grip and grip longevity. Grip is noticeably l

GTR vs Evo X vs STI: which has the best AWD system?

A few weeks ago, I made a post explaining  mainstream AWD system types and how they compare , pros and cons, etc. including some simple diagrams to show where the power goes and how much. As promised, this post will focus on specific cars and what AWD systems they use, especially ones that that have more or less been defined by their AWD systems, and the best place to start may be with a bombshell; the Nissan GT-R. Nissan GT-R (R35) The GT-R has built a reputation around having monster traction and very approachable performance, thanks to its AWD system - Advanced Total Traction Engineering System for All-Terrain (ATTESA) - and what it can do for you. But the GT-R doesn't actually use the most mechanically sophisticated type of AWD systems discussed in the previous article, namely a "true" AWD with a centre differential. Instead, it uses a clutch pack to transfer power. RWD-based clutch-type AWD schematic - Rams Eye The Track Guy © The R32, R33, and R34 Sky

Falken Azenis RT615k+ Street and Track Review

Last year, I picked up a 2009 Lancer Ralliart to do a long term test with it as a dual duty track/daily. One of the first things I knew I was going to do was put a decent set of tires on it. The car came without OEM wheels which was actually good because I didn't have to hesitate about getting a good set of aftermarket wheels to support going wider. Thankfully, my friends at YST Auto Halifax  set me up with a great set of Superspeed RF03RR wheels. The Wheels I had never even heard of Superspeed but I trusted the good folk at YST Auto who mentioned some customer cars running on track with them. These wheels are rotary forged which is basically a prerequisite to be taken seriously in this market populated by companies like TSW and Fast Wheels. The wheels looked like a high quality, well finished wheel and each had a "QC" check sticker on. Just for appearances? Maybe, but I found no defects. The wheels seemed easy to balance (didn't need many weights) and at 18.1 lb. f