maxgsxr1

what is the topspeed of a 2k2 auto with 16 and with 17 inch wheels?reason being my 01 auto with 16inch wheels has a 131mph limiter......

Sprint

iTrader: (10)

deja vu?

http://forums.maxima.org/showthread.php?threadid=86466

maxgsxr1

no.......what i want to find out is the 2k2 auto topspeed? and if they have built in limiters for h rated tires on 2k2's??

Sprint

iTrader: (10)

rent one and beat the **** out of it

Stereodude

Try actually reading the thread. Someone got their 2002 Auto SE up to 147.7MPH.

Stereodude

Bryan H

they are computer limited in theory to 142 mph

Stereodude

Which version? If they were limited to the tire ratings they would go 149, not 142. Considering someone had a 2002 Auto SE to 147.7 (indicated on a GPS unit and 153 on the speedo) I'd tend to say you're theory about 142 is wrong.

Stereodude

dmbmaxima2k2

iTrader: (1)

i want 155 in my 6-spd.

Sprint

iTrader: (10)

did you ask Santa? have you been naughty? or nice

Bryan H

only if you play with rudolph in his reindeer games

dmbmaxima2k2

iTrader: (1)

i wanna be like you so i've been naughty.

Sprint

iTrader: (10)

i dunno what you are talking about...

dmbmaxima2k2

iTrader: (1)

every little thing that we do is just between me and you baby.

Sprint

iTrader: (10)

i don't think so you freak

2001SE

ha ha, he is playin you....lol

dmbmaxima2k2

iTrader: (1)

shhhhhh don't let him know that. every little thing that we do, is just between between me and..................

BottleFedMax

Did you stop because of traffic or that was the top speed the car can achieve?

Stereodude

Re-read what he saids. He wants to go 155MPH.

Stereodude

dmbmaxima2k2

iTrader: (1)

ya that's what i want to achieve.

2001SE

hehe....so what are you guys doing togather anyway...lol?

BottleFedMax

My fault I figured he mispelled 'went' with want.

Dave B

Dude, don't you know that the extra power boosted topend dramatically? The auto 02 Max is good for a 320hp Mustang Cobra stomping 160mph (electronically limited). The 6 speed 02 Max is good for a C5 slapping 175mph. Atleast that's what my calculations say.

Dave (*sarcastic*)

dmbmaxima2k2

iTrader: (1)

smart ***.

Stereodude

Awww poor Dave... Just cause someone ran their 2k2 auto at real 147.7 and the formulas say it should go 147.6 doesn't mean you need to have hurt feelings Dave.

Stereodude

KERR

Ill let you all know when my car gets here.

so far this is what all my cars have done.

98 Integra type R, have no clue, ran out of numbers on the spedo. probably 150-155 ish, Not stock
98 supra 183mph, ran out of road, Not stock
00 Ford superduity diesel 93mph speed limited
97 Jeep grand cherokee 100mph, shaking like crazy with 33's ran out of *****!
97 Ram air 156mph, stock 6 speed ran out of rpms.
01 S600 benz (not mine) 155 speed limited.

Yoritomo

My doubts come more in the way of the torque characteristics of the 2k2. 155 in a 2k2 6sp means redlining 5th (right around 6500-6600 RPM). Based on some of the dynos we've seen, that's not where the peak horsepower is being made. Even Nissan states peak 255 Horsepower at 5800 RPM. I'm just waiting for the mag times on this one. They'll have the most accurate test of top speed.

Don't be a dink. We'll give you a pat on the back when a mag posts a speed at or above your precious 153-5, till then, relax.

Taking the 6 speed dyno numbers and assuming that the PM's were 400 off (which would put the output right inline with nissan specs and actually show that he was putting about 210 to the ground and also explain the rev limiter being low.) then you're getting about 25 less horsepower to the ground than the peak. You know that power isn't a static force. Peak power won't matter if the gearing isn't set up. I will admit one thing though. In a perfect world with perfect gears and the ability to play with gear ratios until you die you could probably get a 2k2 to hit 153 on a two way run on a completely flat surface with skinny *** tires.

About the 2k2 auto.... I'm not even gonna get into since I have no idea the effect a torque converter would have on gear ratios and the engine RPM relation to the wheel RPMs. I'm assuming 3rd and fourth lock.

You already have the spreadsheet. (which is really nice by the way). Care to plug in the gear ratios for a 2k2 4 speed auto? We'll see where it's hitting when you hit speeds like that.

Mag times baby. There may be better quarter miles but it doesn't take much to floor a car in two directions and get the average speed.

Being a jerk started the rather heated argument last time. Doubting doesn't mean we're calling you stupid (although I've mentioned it before, but that was more of a pedantic reaction to your overbloated ego.) Doubting just means we have doubts. I continue to have doubts, at least until I see mag times.

Sometimes you have to allow someone to not agree with you..... Well do I have your permission? Obviously Dave needs it, we wouldn't want to offend you or anything.

irvine78

iTrader: (2)

maxed

I've been trying to avoid this one, BUT - according to my math, in 5th at 5800 RPM the speed should be 150mph and 154mph at 6000RPM which is 3-4hp off the peak BHP.

p.s. 6kW for rolling resistance is a bit conservative, I'd bet it would be between 4-5kW with properly inflated RE92's.

Stereodude

I'm not sure how you're computing that. Supposedly the tires have 780revs/mi. However there is no data that supports this (from people reported max speeds in each gear of the 01). The deflection of the tires seem to change this to about 820 rev/mi. Even if it really were 780 revs/mi 150 would be 6015 RPM in 5th and 154 would be 6175. I believe that the tires deflect enough to equal revs of 820mi which means 150 occurs at 6325 and 154 at 6490.

Either way you guys aren't keeping me accountable. I found a math error in my solving of the equation that skewed the numbers. I'll post several revelations later.

Stereodude

Yoritomo

I honestly never looked over em. Whoops.

Stereodude

Here's the updated spreadsheet. I think the frontal area is slightly off. I've included some #'s for what I think it should look like after adjusting the frontal area (based on the fact that the 01 had a topspeed at 5900 RPM where it only made 212HP, not 222HP). From the dyno #'s, gearing and aerodynamics 147.7 seems right for a 2k2 auto. The 6 speed is a tad messier. It looks like top speed may actually occur in 6th and not in 5th. There is more power at 5200RPM in 6th than at 6700RPM in 5th. The HP, gearing, and aerodynamics in 6th at about ~5200RPM seem to line up to about 155MPH. Once we get some better dyno numbers this may clear up a little since the dynos we have so far are goofy at best.



Stereodude

maxed

Hi Sterodude,

Here are the numbers that I used:

Diameter of 225/50VR17 RE92 = 26" (as measured on the new mounted tires in my basement at 32 psi & 0 mph)

I assumed that the diameter would increase by 3-4% if the tires were inflated to 44psi (to reduce rolling losses) and spinning at close to 1900 rpm (I know they are not drag slicks but there should be some increase). This gives a final circumference of around 84" or 754 rev/mile.

5800 rpm/3.81/0.809 = 1881.7 rpm @ wheels
Divide by 754 and multiply by 60 to get miles per hour. I get 149.9 mph and 154.9 at 6000 rpm.

Stereodude

I used real world data to back out the number of revs per mile. It should be 780 like my #'s show, but I used user reported numbers to try to correct for the deflection in the tires. Supposedly the Car and Driver 00 SE Maxima went 140 at 5900 RPM so that suggests 800 revs per mile. The 00 SE has 16" tires, so that's a little different from the 01 and 02. Another user reported that on a Dyno the 95-01 could only hit 157 in 5th. This suggests 820 revs per mile. However the tire size was not constant all these years so I'm doubting that. I'm settling for a guess of 812.2961 revs/mi for the 02's 225/50/17's. I've updated the above spreadsheet to reflect the new numbers.

Stereodude

maxed

I can't see the revs/miles increasing (unless the tires are slipping), and I wouldn't trust the rpm's from the stock tach either (mine seems to be 3-400 high). I hope the car mags hookup a digital tach for these runs. Anyways, it's time to let this thread die.....

irvine78

iTrader: (2)

are you saying you 'want' to hit 155 or you did?
i hit 153 with my 5 speed...so you should be able to go little bit higher..

Stereodude

We went over this already in this thread. He wants to go 155. He has not gone 155.

Stereodude

2001SE

did you use a GPS, or the spedo meter?

Stereodude

He used a RSM which can be more accurate than the speedo. It computes your speed based on the gear the car is in and the RPM of the engine. I'm not certain how/if tiresize and pressure are taken into account. GPS is going to be the most accurate way to measure the speed since you can't exactly radar yourself from in the car (and I contend that GPS is more accurate than radar anyhow...)

Stereodude