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 Sport Cup 2's vs Bridgestone Potenza RE-71R's

I never thought I'd ever run Michelin Pilot Sport Cup 2's on my 2012 Boss 302. The cost is astronomical and they are supposed to last the least of anything comparable. So how did I end up with (nearly) fresh Sport Cup 2's? A complete fluke. I came across a lightly used set with only a few hundred miles and no track time; 305/30/19 takeoffs from a GT Performance Pack Level 2 (GT PPL2). I knew my 71R's were getting very worn before the season started and likely wouldn't last the whole season, even this short one. The price was far better than a new set of RE-71R's, a little more than half, and local Time Attack rules (Canadian Automobile Sport Clubs) recently made 180 and 200 TW tires equivalent, meaning no PAX or PIP point penalty for going with 180 TW tire like the Pilot Sport Cup 2's. I have been very curious about how PSC2's compare to RE 71R's but I stayed away due to their being painfully expensive and, up to last year, their 180 TW rating would

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

How would a Mustang 3.5L EcoBoost compare to the 5.0L V8?

Ever wonder how a 3.5 litre EcoBoost might fair against the 5.0 litre V8 in the Mustang? Of course you have. Ever since Ford dropped it in the F150 (and perhaps well before), everyone has been wondering how it would perform. There are basically two camps; those who think it would be awesome because of tuneability and power potential and those who think it means the death of the V8 in the Mustang. If you are in the latter group, we seem to be good so far with continuous upgrades to the 5.0 litre Coyote and the brand new Shelby GT500 which still uses a supercharged V8 as it has been for over a decade and multiple iterations. But what if... Well, it seems we are closer than ever to finding out the answer to that question. American Trucks recently got together two crew cab, short box, 4x4 F150's but one has the 5.0 litre V8 and the other has the 3.5 litre EcoBoost V6. There has been a few comparisons between 5.0 litre and 3.5 litre EB F150's, but this seems to be the most di

Bridgestone Potenza RE-71R Track Review

2012 Boss 302 on square 305/30/19 RE-71R's at AMP - Graham MacNeil © For better or for worse, I have heard and read so much about RE-71R's. Everyone swears by the grip but complains about the wear. Generally speaking, the pros are: 1. They grip as well or better than most R comps. 2. They don't wear as quickly as R comps if driven occasionally on the street. 3. They work better in the rain than R comps. The cons were limited to overheating quickly when used on track (being an autocross tire) and wearing too fast on heavy cars like mine. In the popular 200 TW category, they are faster than the popular Hankook RS-4's and BFGoodrich Rival S's according to published Tire Rack Tests. According to plenty of reviews, they are also faster than well established R comps like R888R's (which don't seem to work too well on heavy cars anyway) and the venerable NT01's. But I was still hesitant for a while until I talked to a tire tech support gentleman