1987, non turbo, 5 speed
what would i need to do to go faster than 300km an hour?
O_O You’d probably wanna make sure the car won’t shake itself apart for one. And assloads of engine work I’ll wager. Z rated tires that can handle the speed as well.
B-Wurm 
Oddly enough the Z speed rating isn’t the highest tire rating. I dont remember which ones are higher, something like W and another one or something I belive. I think Z is only like 250Km/H.
Better tires, more power, better aerodynamics.
I have done 270 or so in my Z (although the speedo is probably off by a bit) and I will never do it again. It was just stupid.
last person i knew that said they wanted to go 300KMH died, so just a word of warning to ya dont attepmt it unless you have some serious safty shit in your car.
Andrew
I’d say you’d need the right gearing and at the very least 400hp. 450+ would be better though.
For example a 2000 Dodge Viper GTS (rated at 450hp) tops out at 186mph, which is exactly 300km/h. I’m going to guess that your 300 is a little more slipery and has less frontal area which would make it possible to do that speed with a little less power. Not much though.
Ya, Z rated tires are not the highest. I beleive W is. It isn’t in the order many people think it is. Z is good for like 250kph
Taken from Tirerack.com
Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:
225/50SR16 225/50SR16 89S or 225/50R16 89S
Each of these was an acceptable method of identifying speed ratings.
Early tires had their speed rating symbol shown “within” the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.
225/50SR16 112 mph, 180 km/h
225/50HR16 130, 210 km/h
225/50VR16 in excess of 130 mph, 210 km/h
Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire’s service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:
M 81 mph 130 km/h
N 87 mph 140km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars
While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire’s 168 mph, 270 km/h maximum speed.
225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h
Most recently, when the Y-speed rating indicated in a service description is enclosed in parentheses, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:
285/35ZR19 99Y 186 mph, 300 km/h
285/35ZR19 (99Y) in excess of 186 mph, 300 km/h
As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.
Realistically there is no reason you would ever have to go that fast, so why even ask? non-turbo you will be lucky to break 220kms. I hit 210kms with some minor mods on my 85 nonturbo, but you will have to go turbo if you want to go much faster than that. There isn’t much you can do aerodynamically to a z31, so you need better gearing, at least 400hp and good tires.
i wanna be like a skyline, going 320kms/h
ive hit 280 in a 50th, in stock form
it was floating a bit!
i jsut want to know the top speed of that car!
im well aware about safety shit and so forth!
Stock skylines aren’t any faster than your car. Meaning non turbo R32s.
How old are you?
You are dumb for thinking that doing 300km/h in your 87 na 300zx is feasible without dying.
you guys dont get me
i dont plan on attempting this in a stock NA Zed!
lots of carefull planing and safety shit will happen before any of that!
just simply wan to know the top speed!
im 22 BTW, and no im not crazy, just got a need for speed!
my goal is to have that car travel at that speeds once the whole car has been taken care off!, not anytime soon!
show me some love guys!
nothing but people dissin on here!
A GTR will go to 260 with the speed cut wire disabled but it will stop dead at 260 with more grunt to go. A guy in Ontario tested it out.
lets say you wanted to go 370km/h. What tires do you use then?
When my 300zx is complete I am sure it will go 300 but I am not dumb enough to go that fast, even with a full cage I could easily die. Not worth it in my opinion.
not even 1 time?
u have to redline any car u drive! its like a rule or somthing!
im confident u can build a car to drive that fast, but only under perfect conditions is it to be tried!
I heard Nis_mo is a homo.
I heard Nis_mo is a homo.
Maybe you mean confident in your abilities to go that fast. You could die at any speed.