Quick question about speed

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Feb 12, 2007 | 05:14 PM

#26

Asterisk

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From: midwest IL, USA

Quote:

Originally Posted by TehMonkay

If you have a base model with the H rated tires you cant go past 130 anyway. Thats about what my na maxed out at.

Lol, probably the best thing anyone has said in this thread so far... Get some proper speed-rating tires first, or they might jsut blow on ya.

Last edited by Asterisk; Feb 12, 2007 at 05:20 PM.

Feb 12, 2007 | 11:07 PM

#27

NZConvertible

I'm a boost creep...

Joined: Jan 2002

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From: Auckland, New Zealand

Quote:

Originally Posted by gxlbiscuit

oh i love whoring top speed threads 167mph 6500rpm or so 5th gear with 225/45/17 4.10 t2

6500rpm would only give you 146mph. 167mph would require 7400rpm...

Feb 12, 2007 | 11:20 PM

#28

blmcquig

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From: Cedar Rapids, IA

Quote:

Originally Posted by NZConvertible

6500rpm would only give you 146mph. 167mph would require 7400rpm...

did you consider the tire size?

Feb 12, 2007 | 11:33 PM

#29

Spannersrx7

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From: New Zealand

I havent maxed mine out but 6500 rpm in 5th easily attainable

Feb 13, 2007 | 12:06 AM

#30

NCross

I have a rotary addiction

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From: Columbia, Tennessee

Quote:

Originally Posted by My5ABaby

The numbers don't vary depending on weight, wind, incline, etc... They're set via gearing. At a certain RPM in a certain gear you will be going a certain speed. However, the extra weight, wind, etc. will help determine how fast (or slow) you get to that rpm/speed.

Anyways, here's my numbers on a 86 Sport with stock rims/wheels.

At redline:
1- 30
2- 60
3- 90
4- ??
5- ??

im pretty sure wind and weight can affect your engines load. if someone has scientific proof that says otherwise please enlighten me.

if there is 30 more mph of wind coming at you and you have 100 more pounds than another car then your engine will naturally work harder to attain or hold the highest speed that a gear can offer. therefore reducing the highest possible speed.

Feb 13, 2007 | 04:27 AM

#31

NZConvertible

I'm a boost creep...

Joined: Jan 2002

Posts: 15,608

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From: Auckland, New Zealand

Quote:

Originally Posted by blmcquig

did you consider the tire size?

Those numbers are for stock diameter tires. His tires are only ~1% bigger overall, so maybe add 2mph. Still well off the claim.

Quote:

Originally Posted by NCross

im pretty sure wind and weight can affect your engines load. if someone has scientific proof that says otherwise please enlighten me.

What he meant was wind and weight have nothing to do with the max speed in the lower gears, only top speed overall.

Weight actually has hardly any effect on top speed. The only effect weight has is on the rolliing resistance of the tires and maybe the wheels bearings, but at top speed this load is only a tiny fraction of the load required to overcome aerodynamic resistance. Wind will obviously affect top speed.

Feb 13, 2007 | 07:38 AM

#32

My5ABaby

Rotaries confuse me

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From: Murfreesboro, TN

Quote:

Originally Posted by tomoaac

At 4 in the morning, on a road i know well 95 mph is a safe crusing speed. At that time UK cops wouldn't even pull you over!

If there's no cars on the road, go for it. What a lot of people don't take into consideration (not you necessarily) is other drivers on the road. I know a lot of roads well enough to go 120mph on them but that doesn't mean I trust other drivers not to do things like pull into my lane. Also, other drivers aren't used to checking for and judging the speed of cars going that fast. It's very easy to misjudge the speed of a car coming behind you at 120mph when you're used to cars coming up on you at 60mph.

Just a thought...

Quote:

Originally Posted by NCross

Resistances (rolling, wind, fat people, etc.) do affect overall top speed and acceleration. However, they don't affect the speed at a set rpm in a certain gear.

Ex. My 7 (~2700lbs) redlines 3rd at 90mph. If it weighed 5000lbs it would still redline 3rd at 90mph. Granted it would take a hell of a long time to get there... but it would still be the same.

I think we're saying the same thing. However, your first post made it kind of unclear.