Top Speed

Anyone know the top speed of an auto stock 2000 G20?

haven't punched mine that far, but probably 130mph at most if that. why? did you want to get a ticket for attempted manslaughter? dohhhhhh!!!;)

The G20 when it gets up there its kinda strange. I let my friend which is a cops son (hence we didn't get a ticket) drive it to well the speedometer registered 130 but the rpm meter kept goin so i guess the speedpmeter stops at 130 but the car goes faster. I hit about 7300 rpm before the engine dropped the rev

I've had my 2001 G up to 125 mph, and it felt like there was plenty left. Then my buddy yells, "slow down!, what are your tires rated for?" I thought oh crap, what are they rated? i wussed out and slowed down....man stuff comes up quick at the speed.

Yea, ive gone about 125.....there definitly feels like there is more there

i have had my g up to 140 got clocked by a radar gun still had a little more left it felt like

Howd you get to 140?? Did you get the governer taken off??

no theres not any mods on my car other then just a video and a sub system:devil:

Oh.........does anyone know what the governer is set at??:licker: :licker: :licker: :licker:

Probaly Pretty close to 140 it was pretty close to topped out

Originally posted by Sleepy
Probaly Pretty close to 140 it was pretty close to topped out

Whats a governer?????

If I am not mistaken, there is no top speed limiter (governor) on the G20's. Atleast the P10's do not from what I hear. I do not know anything about the P11's. I had an NX2000 (recently sold) and about 2 years ago I ran it out on a desolate hwy. The speedo read an estimated 143 MPH and still wanted to go more.

I believe the top speed is inhibited by the aoredynamics of the car and just how much oomph the car has in stock form.

The '96 Infiniti G20 brochure states top speed is 130MPH.

The only 'governor' I am aware of is the RPM limiter (Redline).

Originally posted by Koojo


Whats a governer?????

A governer is usually a little bit of info built into the ecu.....you can get it taken off, for example, when you get your ecu reworked by , say, JWT, they remove both governer and rev limters......most cars have some sort of a governer, (M's, by BMW, all have their gov set at 155mph).....hope that helps! :licker: :licker: :licker: :licker:

Anyone know what rpm the rev limiter is set at?
I've hit it a couple times, but didn't see where it was at. oops...my excuse is I was trying to watch the road.

Originally posted by dre
Anyone know what rpm the rev limiter is set at?
I've hit it a couple times, but didn't see where it was at. oops...my excuse is I was trying to watch the road.

lol........good excuse...........anyways, i think its about 7200 rpms.......about there.......

IN THE WINTER I HIT 135 RELATIVELY EASY ON THE PULASKY SKYWAY HERE IN JERSEY. 4TH GEAR PULLED STRONG TILL ABOUT 123 OR SO . I THEN PULLED 5TH TO ABOUT 135 I THINK IT IS CAPABLE OF 140 WITH A LITTLE MORE STRETCH OF ROAD AFTER 130 THE PACE SLOWED CONSIDERABLY I GUESS DRAG MUST BE PLAYING A ROLE...HOWEVER THE OTHER DAY ONMY WAY BACK FROM SCHOOL I TRIED DOING THE SAME THING AND IT SEEMED TO TAKE FOREVER TO DO 135. I NOTICE A HUGE DIFFRENCE IN PERFORMANCE ON MY P11 IN THE SUMMER. THE CAR FEELS SLUGGISH WHILE IN THE WINTER IT'S VERY LIVELY.

what are the tires rated for? ive got the t with the Potenza 195/60 15s.

oh, and the top speed of the car is a direct function of the diameter of the tires, multiplied by the final gear ratio and current gear ratio, times engine rpm... and like you said, engine rpm can and often is governed, either by a chip in the ecu, or by your willingness to go over redline.


Formulas:

TireSidewallHeight = 2*(TireWidth/25.4)*AspectRatio/100
TireDiameter = TireSidewallHeight+WheelDiameter
MilesPerHour = RPM*TireDiameter*PI*60/(GearRatio*63360)

195/60 15
195 = tire width, 60 = aspect ratio, 15 = wheel diameter.

a java calculator that uses the above is found here: http://www.geocities.com/z_design_studio/

about aerodynamics... the G has a pretty good coefficient of drag going for it... .30 if i'm not mistaken, that is on par with a corvette. since the top speed of the tires is a function of the engine and transmission, aerodynmics doesnt have much to do with it. i think at like 100 mph, an average car would need to produce 70hp just to maintain speed, as opposed to traveling at 35mph, when it would only need to produce 7hp (thus the reason behind slowing down for better gas milage). so i guess in a way aerodynamics COULD limit the top speed... when the amount of hp needed to maintain speed equals the max hp the engine is producing... yeah i guess you could get your speed limited. but even with 140hp, i bet the G could overcome air resistance due to its steamlined design and a transmission that puts a good % of the engine power to the wheels.

The Potenza RE 92 came with the stock G20t is H rated, that means you can run 129 mph safely for 30 mins....( I think it is 30 mins.....or 1 hour..I don't remember, that is how they rate it tough ). I got Potenza RE 730 and it is Z rated, so I can go faster I want with my G not to worry about my tires overheated.

Ok, so using Brian P's method (thanks).........here are the speeds
At about 7k rpms, the top speed with factory tires is about 160 (??- you might want to check yourself).........

I dunno about all G20s.

But my older brother used to own my G20, he drove from Minneapolis MN all the way to Ithaca NY with a friend to stay for a week.

On the way back (while going through canada) a canadian patrolman pulled my brother over clocked at 145mph. I'll talk to my bro, hes got pics of the spedometer hitting 130 and the revs kept going up.

Fastest ive taken mine is 115. I dont wanna get pulled over goin real fast. =]

well according to my calculations, my auto '99 with the low profile tires will max out at 7000 rpm (redline) at 177.66 mph. and if i'm feeling REALLY stupid, i could (theoretically) rev it up to 8000 rpm (well, the ecu probably wouldnt let me) and top out at 203 mph.

whats funny is that the speedo tops out at 125 mph, but according to my calcs, 3rd gear goes all the way up to 124 mph. then youve got your overdrive.

I verified my numbers by using that Z car applet thingie. according to those formulas, I am correct. i know it seems very strange... and for an underpowered car like the G, it would probably take 20 minutes to reach those speeds since the gearing becomes so low. if you were driving around on a high speed oval, there is a good chance that you might never see 178 mph because when you hit the turns, the added friction would likely tax the engine enough so that it could not accelerate further during turns.

so basically, assuming those formulas are correct, and that the ECU governor wont screw with ya too much... yeah, this car really goes that fast... but then again, i'm sure most cars could.

it might work with those calculations, but if you look in the back of the new SCC, it shows how much of a difference the cd (coefficient of drag) makes........i really doubt we could get anywhere near 177

i own a 94 g20t automatic
one day i waz coming home from work and i pushed my car all the way and it clocked 120mph.
is that good or bad?
all i got is an intake and advanced timing!

dude thats not bad ran my to 140 stock other then some timing advancement my a 2001 g20

My mother 1999 auto primeragxe with 17 timing :D did 200kmh no more in a very strait road (the same that I test my car)we test with a gun machine laser (police friend) and the car did not pas the 200kmh (199,450) the tachometer were at 204kmh.

Well, I entered in the info from the FSM to the calculator and got some very interesting results.

Info from FSM:
1st gear : 3.063
2nd Gear: 1.826
3rd Gear : 1.207
4th Gear : 0.926
5th Gear : 0.733

Final Drive: 4.176

Here are the speeds at which the car would be travelling at 7500rpms (stock redline in the P10) with 205/45/16 tires and stock 195/65/14 tires

205/45/16 (195/65/14) *in miles per hour
1st : 41 (42)
2nd: 68 (70)
3rd: 103 (106)
4th: 134 (138)
5th: 170 (175)

That to me seems very high. I don't remember second topping out at 70mph, i thought it was more in the 60-65mph range? and I thought 3rd tops at right at or slightly under 100mph? Or could it just be that my tires have worn down enough for me to notice that big of a difference? Either way, 170 seems REALLY REALLY REALLY high for our cars.

Either way, 170 seems REALLY REALLY REALLY high for our cars. Of course they won't do 170mph - the calculator does not take horsepower, drag co-efficient or rolling resistance into consideration. It's just a straight gearing calculator ;)

Originally posted by T4 Primera
Of course they won't do 170mph - the calculator does not take horsepower, drag co-efficient or rolling resistance into consideration. It's just a straight gearing calculator ;)

I don't think it would take that much hp to top our cars out in 5th gear. A couple list members ran their NX2000 in the Silverstate race and they managed to race their NX to the top of 5th gear, and I am pretty sure they are N/A powered and they were even running slightly larger tires IIRC, so it is definitly possible. Their gearing runs out right around 150mph so it's not too much different from the G20's, just slightly smaller. I think a small turbo would easily power a G20 to the top of fifth gear, probalby with the just the majority of the bolt ons it would be possible too. I just thought that our gears ran out before 170mph. I didn't realize there was that big of a difference between the SE-R tranny and the G20's.

I don't think it would take that much hp to top our cars out in 5th gear. Did some rough calculations on this 170mph (5th gear @7500rpm on 205/45/16s) in a G20 thing and you would need 208 wheel horsepower just to overcome wind resistance. Add more at flywheel for drivetrain/rolling resistance losses
Formula: Power to overcome aero drag = 1/2*air density*cd*cross sectional area*velocity CUBED.
air density = 1.177kg per cubic metre
cd = 0.30
cross sectional area roughly = 2 square metres
velocity = 76 metres per second = 170mph

man, summer break is not over yet...dammit, can't we talk about something other than math!!! :( hehehe j/k yall:D

Any of you guys know what wreckless driving is....you normally get thrown in jail for that....I think the CHP or any other highway patrol cop will consider anything over a 100 to be a little wreckless....be safe dont fuck around like that....I know a little math too and as the speed doubles your momentum quadruples.....its the same for the driver too...now take into account reaction time at such a speed.....better hope you have some 15in rotors with some 6 piston caliper and 20in wheels.....you'll need all the friction possible,......

I agree, public roads are not the place to !@#$ around!

In NZ you can lose your license for doing 45km/h over the speed limit, so on the open road - thats 90mph = no license. Still better than killing/maiming yourself or someone else though.

Originally posted by T4 Primera
I agree, public roads are not the place to !@#$ around!

In NZ you can lose your license for doing 45km/h over the speed limit, so on the open road - thats 90mph = no license. Still better than killing/maiming yourself or someone else though.
In the U.S., the rule is supposed to be 30mph over the posted limit = "reckless driving," which means an automatic license suspension. That's what it's supposed to be, but I don't think they enforce it enough. :mad: :(

Originally posted by Silver S2000

In the U.S., the rule is supposed to be 30mph over the posted limit = "reckless driving," which means an automatic license suspension. That's what it's supposed to be, but I don't think they enforce it enough. :mad: :(

You sure that is in the U.S.? I dont see how they could enforce a Country wide traffic law. :) Anyways, Utah it is double the speed limit is wreckless driving. According to my friends dad, who is a cop.

Originally posted by kbslacker
You sure that is in the U.S.? I dont see how they could enforce a Country wide traffic law. :) Anyways, Utah it is double the speed limit is wreckless driving. According to my friends dad, who is a cop. Good point. Allow me to amend it to say "California." :)

Speed doesn't kill.....

It's the sudden deceleration. :jump:

As for math, get used to it. Life is full of math and the more you understand it the more you will understand many things in life. And, if you are really interested in cars, math is used to model/explain just about everything. Trust me, learn as much math as you can.

As for reckless driving.....

it varies from state to state. If you are going to do top speed runs, try to find someplace where there is nobody else on the road. Try to find a nice straight piece of road.

In the ends, who really cares? It's trivia. It's BS to argue about over too many beers and that just isn't worth risking your life over is it?

OK, I'm an old fart and I'll just go back into my corner. :jump:

I've done 215km/h when alone in the car (a 125hp 2.0SE primera of '96).

done 205km/h with passenger(s) on straight freeway at midnights.

It's the sudden deceleration

And all this time I thought it was the speed that killed you:huh:.....maybe I should take Physics again...hehehehe...go over the section on energy impulses....

hey S2000, you screwed up ralph's quote. its "My kitty's breath smells like cat food."

Originally posted by P10DET
Speed doesn't kill.....

It's the sudden deceleration. :jump:



In a way yes, In another way no. The impact of the sudden deceleration is in ratio with the speed. The Higher the Speed, The Higher the Impact of the Deceleration. The Higher the Impact of the Deceleration, The greater chance you have of dying. So you can basically conclude from that ratio that the Higher the Speed the Greater Chance you have of dying. So speed can kill ya. damn im good :D

My dad got 145 mph, and there was still more he claimed. This was his old 98 Primera GT. On the paper claimed to do about 138 mph.
That`s a hell of lot more than mine! My car is claimed to do about 100mph, I got 110 mph. (with my new airfilter that is, but with 215-40-17", wich decreases perfomerance a tad)

Originally posted by wickedG20
In a way yes, In another way no. The impact of the sudden deceleration is in ratio with the speed.

Duh.

It's a joke.

Originally posted by Primera-TDLX
My dad got 145 mph, and there was still more he claimed.

I'm not saying he did or didn't, but our cars have notoriously inaccurate speedometers at very high speeds.

Originally posted by Brian P
hey S2000, you screwed up ralph's quote. its "My kitty's breath smells like cat food." I have it on tape, in print and on a page-a-day calendar. ;)

Originally posted by P10DET


I'm not saying he did or didn't, but our cars have notoriously inaccurate speedometers at very high speeds.


Yes I know, and I belive the "real" speed was maybe 135 mph or something. What car manfucturer will say their car runs slower than it does? It makes no sence, so I belive that the real top speed is 138 mph, but maybe the speedo say 150 mph or something.
I agree to you P10DET!:frog:

I had mine up to 230 Km/H

With very small modifications.

Originally posted by TeamNissan
I had mine up to 230 Km/H

With very small modifications. What modifications??? I think your car is the best looking P11 I've seen!:)

Thanx a LOT....... :o) NICE car you got to! My father also got a P10 :o)


I just rebuild it into a GT:

GT downpipe
GT manifold
GT ECU
K&N

But my new project consist of

EFI EURO-1
285 degrees cams
Racing Manifold
2,5" exhaust
injection houses (don't know the english word)

It's going to be VERY interessting.......... :frog:

I did 230 Km/T with 2 people and 80kg of wheigts 15 liters of Soda 12 bottles of wine and camping/lugage equipment for two weeks of camping.........

I'll post a picture tomorrow! :)

Hmmmmmm dead post, but OK still going to post the picture tomorrow! :frog:

Maybe we should make a thread with pictures of Max Speed....... :frog:

Ever done this? I was racing a Mazda 323 in my old Skyline along the motorway and I
was ahead doing about 170-180 km when the car next to slowed down really really fast
so i looked back in my mirror then looked ahead and there was 2 cops doing a guy
across the road I almost had a heart attack but I kept going, just as well it was dark.
I hate having a cut out in my G20 because I know I could possibly get at least 230 km
as I get 160 out of 3rd gear alone and hit speed limiter just in 4th gear.
What is the conversion for 177 mph? it sounds optimistic. is 200mph=320kph??
TEAMNISSAN, where do you do those speeds? Are the motorways limited or are they like
the Autobahn?
My mechanic has told me stories about the Autobahn, hes originally from Denmark, hes
the only mechanic I know with an automotive degree!

Haha dude...my mate got handcrafted by the cops for doing 180hm on the motoroway man....
don't risk it....get a radar..they work fine with cops..just not speed camera

hey what's the top speed you guys have done with an AT?
i have never reached 200km/hr as it acceleration is sooo slow after 180k...
the 4th gear is horrible...
feels like the gear is not fully in....
god damn torque converter! :(

Damn that would've been an impressive fine, I've been done twice for 50 km over the limit and it left me poor for ages.. I have been pretty good recently only 2 speed camera fines I think one recent and one I have had for like 8-10 months! I might have to pay it at some stage.
I raced a VN 3.8 V6 a few weeks ago and lost I was sooo gutted, on the motorway at 100 we both nailed it and I shot past him now worries but at 160-170 he took me and kept on goin over 200 I think. In my old skyline I would have left him for dead top end! I can't believe I got beaten by a Holden...with 2 westies in it...:mad:

I used to have a T4 P10 primera and I never got more than 160-170 I believe (automatic) you really notice the difference with engine capacity, my Primera would leave my old skyline for dead off the mark but top end in the Primeras is lacking however I have noticed Primeras are quite competitive on the motorway against turbo GSR's and GTX's as they run out of puff top end.

I think you need a turbo! That should help the top end a little bit :D

One day maybe the next 4-6 months I will *sigh*
Being a student sucks, always poor, in debt, drink too much....

Originally posted by G20-KIWI
One day maybe the next 4-6 months I will *sigh*
Being a student sucks, always poor, in debt, drink too much....
I hear that... UofA likes taking my money too. Never really drink, so my money pretty much just goes to my schooling, car, insurance, apt, food, etc... DOH! What it was like living at home, with hardly any expenses :D

What are you guys whining about school for? You both have great cars.

Why, when I went to college (university), I had to walk 10 miles, uphill both ways, often through chest high snow, fighting off the occassional Sabre Tooth Tiger. :right:

LOL!!!:hehe: :hehehe: :hehe: :hehehe: :hehe: :hehehe:
I nearly fell out of my chair because of the sabre tooth tiger! :D

Well, here's a fitting picture for this thread... Don't worry, this was the safest possible top speed run ever! :D NO seriously... There was NO chance of me even getting caught :D If you've ever gone this fast you'll know why.
http://groups.yahoo.com/group/Team-NISMO-AZ/files/Justin/top%20speed.jpg