February 28, 2013 4:59 PM  |  Posted By: David_Yu
Rated 3.5 out of 5.0 by 6 members  |  7 Comments  |  13324 Views
Related Categories: Fast Fleet blog

Stealthzilla recording 717hp at Surrey Rolling Road

Following on from the big reveal in evo issue 180 that Stealthzilla is now running 717hp, courtesy of a brace of Litchfield “Stage 4.5” turbos and matching Milltek downpipes, the question arises: How usable is that level of power and is it too much?

Of course the weather has been generally pretty atrocious since the conversion to LM700 spec was done (Litchfield reserve LMxxx nomenclature for cars that have the appropriate brake and suspension mods to match the level of power), but I have taken the GT-R out for the occasional run when the roads haven’t been overly coated in salt.

Iain has been cautious in tuning his Stage 4.5 cars to keep torque and boost lower in the lower reaches of the rev range in order to preserve the standard con rods. My car is running about the same torque as it was before, 620lb.ft, but it is produced further up the rev range and sustained higher too.

Now I’ve had a chance to get acclimatised to it, there is less of an instant kick in the back, but there is a wonderfully linear increase as the tacho winds round to the redline. On the standard turbos, the engine has done its best work by 6500rpm, now there is more to come right up to 7200.

Despite the more linear power delivery, traction is –rather predictably- a bit more of an issue than before, particularly on cold, damp tarmac. When the current set of Michelin Pilot Super Sports wear out, I am going to investigate slightly wider options for the rear pair.

However, “traction issues” is a relative term in a GT-R. Even flashing TC lights (in Race mode) do not mean the car is not accelerating, and accelerating hard. Accompanied by the slightly deranged howl from the Milltek downpipes feeding the Akrapovic titanium system, Stealthzilla simply catapults itself down any given straight piece of road. The linear torque delivery means it is easier to mete out that acceleration on corners too.

So the answer is, 700+ hp is eminently usable and is in no way too much. In fact, it would be nice to have more low down grunt, which means changing the rods. Which means I might as well change the pistons… uh oh.

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Alligns at 6:42 PM July 9, 2013

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David_Yu at 2:07 PM April 16, 2013

Hi Kingsuna, thanks for the comments. However, we in the UK still generally quote estimated flywheel/crank horsepower. And in this case, as in all my previous rolling road numbers, it is the flywheel hp that is quoted. A stock bottom end would not survive 717hp at the wheels!

Kingsuna at 1:40 PM April 16, 2013

Guys, I hope you remember that he is running 717 HP at the Wheels! Take into account the 18-20% loss through the drivetrain on an AWD dyno, and he running 860-900 HP at the crank. Nice car, and there is a lot more reliable power that could come (once he changes the stock bottom end). This car is running a lot more power than any SLS Black Edition, Lamborghini Aventardor (stock), etc... Also any HP specifications or HP/Ton ratio in magazines is based on crank HP not dyno-mometer HP at the wheels. Manufacturers never use actual dyno power (when on car, drivetrain, etc...) because power numbers inevitably come down. Real tuning and modifications outfits like Litchfield/AMS/Switzer/etc... therefore always quote dyno numbers at the wheel, not crank numbers. For proper comparison, a stock GT-R 2013 runs around 545 HP at the crank, 435 HP at the wheels. Nice job David!

LAX at 5:58 PM April 9, 2013

As lovely as the Nissan GTR is, one wonder how lovely wouldn't a vehicle from the same brand be if it weighed in at 3000 lbs!? NBR 30/s faster? /Lukie

Bunta at 9:02 AM March 8, 2013

I need to have a p-ride in this David, it sounds utterly amazing!

Rotrexman at 11:52 PM March 2, 2013

It would be fantastic to see a video of this car - either a soundbite or track action perhaps ?

Samoht at 7:42 PM March 2, 2013

Well, I generally think power/weight ratio is what counts. 200hp/tonne is a generally accepted threshold to be 'fast'. Assuming 1750kgs, Gozilla III is now sporting double that, 400hp/tonne. Wow. Still, that's the same as a brand new SLS Black Edition, and 'zilla has the substantial advantage of 4wd. Sounds awesome, hope you keep having lots of fun!

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