by Bugatti you must have meant to say Cobalt SS or RSX because we all know those are the fastest land vehicles in existence.

 

Whats an RSX? LOL, you must have meant RX-8?

 

someone needs to expose you to the almighty greatness of the Acura RSX. it's so fast that its 0-60 is measured in negative time frames.

 

I have, just not many times. i hit 125 in fourth and i definatley wasnt close to redline... heres the scene

http://youtube.com/watch?v=4ZfuBlUFgz0&feature=related

As soon as my car was visible, i was on the breaks... i was at 130 before visibility but let off the throttle and was light on the breaks because the car in front was coming up fast..


and this is just of me recording the exhaust notes

http://youtube.com/watch?v=H402MCquhnE


This is really the first time i've pushed it to redline..wow

 

At the track, I have routinely done 103 in third and 131 and 132 in fourth. There is a little more in fourth, but I always shift at about that point. I will have another track event the first week fo Feb and I will make a note to try and see what the 4th gear max is.

 

Whats the point of a flyby if your going 60mph on the brakes when you flyby the camera?

BTW-you speeled TANABE wrong in your sig, spell it right and pick up some ponies...

 

Firebase99,

No this is not a joke. Why wouldn't it work? A single gear is linear, so if you are at 2000 rpm in that gear doing 30 mph at 6000 you would be doing 90. That is the only way it could work. If for some reason you are going slower than the formula predicts your clutch is slipping.

As to the higher gears, if the car is not electronically limited it will be aerodynamically (unless you have 1000+ hp)

 

Not all gears are 1:1, Id imagine that makes a diff if the formula works

 

no, not all gears are. But if you select a gear, it does not matter which one, the speed through the rev range will be a linear progression. That is if at 1000 rpm the speed is X mph, at 2000 it has to be 2X. It can't be anything else as the gear ratio does not change with engine speed.

This does not take into account shifting gears at all. This is for one gear at a time.

 

Your theory is bogus as has already been pointed out, why do you disagree?

 

Well, since it is not a theory but a fact I don't see where it is bogus...get in your car take some digital pictures and prove that your mechanical gearbox is non linear for any single gear and at the same time prove me wrong.

 

Firebase proved how off you were, its bogus

Gears and acceleration are not linear. You cant take any gear and do the "magic" you claim, diff ratios for each. 1/2 of 5th is not 1/2 of 1st gear.

The benefit of the doubt is on you, so YOU go get some pics of 148mph in 3rd gear LMFAO-I'll pay you money for a dyno to prove it wrong, so long you fall on a knife (prefferably on video) after you realize your wrong.

 

I'm turning more than 2000 RPM's in 3rd gear, you should be too.


Alberto, this method is right, the debunking is just someone getting confused and then telling him hes wrong.

 

If its so right, simonfencer needs to provide us examples of how this method works in his Z. No ifs and o rbuts, if it works it works if it doesnt likewise. I dont drive my Z daily anymore, so I cant offer any gear/mph/rpm examples atm....can somebody chime in?

 

I'm actually surprised you are falling for the falacy.

He isn't saying that acceleration is linear, but the multiplication of revs is linear within the same gear. At 50 in 2nd gear, you are turning twice the number of revs as 25 in 2nd gear. Its the same idea.

 

Copied from Aceman's 4.083 gears thread:


STOCK 3.538 Gear-- ECU REFLASH 3.538 ---HR Engine
6600 Rpm Redline -------7200 Rpm Redline-----------7500 Rpm Redline

First -----38mph ------First-----42mph-----------First-----43mph
Second ----62mph-------Second----68mph-----------Second----71mph
Third -----89mph-------Third ----97mph-----------Third----101mph
Forth ----114mph-------Forth----124mph-----------Forth----129mph
Fith -----144mph-------Fith-----158mph-----------Fith-----164mph
Sixth ----182mph-------Sixth----199mph-----------Sixth----207mph


The gears are linear, this also gives shift points for those who were asking.

I turn 3330-3350 ballpark in 3rd gear at 45. I turn over 2000 in 4th gear at 45, so its wrong to divide the redline by 2000, you need to divide by 3340 (calculated).

6,600/3,340 = 1.98

45*1.98 = 88.9 (which is what the chart shows).

Method works.

Edit to show thread, its got some good info: https://my350z.com/forum/newreply.ph...eply&p=4390297

 

Thank you Peak350...I thought I had made that clear part clear, oh well, no harm, no foul. And for the record, when people started shooting my "theory" down, I checked it all again to make sure I hadn't missed a step.

In my early 20's I drove a '76 Celica GT with a broken speedo using this method (I looked up the gear ratios in a repair manual and then used a formula Road & Track published for determining speed based on gear ratios and tire sizes) and didn't get stopped for speeding once in that car...I knew exactly how fast I was driving the entire time just using the Tach.

And seeing as Peak350 made the post just above this one while I was typing, he is spot on correct, the calculations are independant for each gear too.

 

simon-my apologies, the rpm/mph given initially was off I did not catch that in the "Example"

As you guys can see I suck at any type of math, pretty neat trick. I guess the mph used as the base accounts for any changes in tire diameter?

 

Here's the post from VitViper...

Sure can:

Stock 3.538, 7500 rpm shifts:
1st............... 44mph
2nd.............. 72mph
3rd............... 103mph
4th............... 132mph
5th............... 168mph
6th............... 211mph

4.083 gears, 7500 rpm shifts:
1st............... 38mph
2nd.............. 62mph
3rd............... 89mph
4th............... 114mph
5th............... 145mph
6th............... 183mph


I was the first 07 with 4.083 gears and recommended them to aceman when he asked me about them. As far as the 07 perspective... if you are n/a it really LOVES this gearing, especially with the new redline. 1st through 4th pull so much friggin' harder.

Instead of shifting to 4th almost the instant I cross the finish line in the 1/4, I'm shifting into 4th right at or instantly after the 1/8th now (I only made one pass, it wasn't an impressive time since I left the line from almost idle due to clutch issues).

 

Alberto,

Like I said, no harm, no foul. Tire diameter and gear ratios really don't matter in what I outlined as all you are really doing is comparing engine speed to road speed.

Here is a link to a site that has the formula I mentioned in my post above. It only looks complicated, honest.

http://www.type2.com/library/misc/calcspd.htm