Miss Shift
Former Moderator
Joined: Mar 2004
Posts: 4,686
Likes: 0
From: Yorba Linda, CA
Originally Posted by mikegarrison,Jul 16 2008, 05:08 PM
Did I say that? No. I said that if you shift *at redline* then it drops about 3000 rpms. Is redline 5000 rpm on your car? Because it's not on mine.
However, checking the easily available "gearing calculator" at Turnzero does show ideal redline shifts getting smaller at every gear. Which isn't what it seems like, but I guess must be true.
I tend to doubt it is the reason for this being the issue, however, but I'll now grant it wasn't as unreasonable a claim as I first thought.
Here's a video with RPM shown. And yes, even though it's my own video on my own car, I'm offering it as evidence that I was wrong about the shifts dropping the speed 3000 RPM.
http://www.eskimo.com/~mikeg/videos/...fa_evospin.wmv
However, checking the easily available "gearing calculator" at Turnzero does show ideal redline shifts getting smaller at every gear. Which isn't what it seems like, but I guess must be true.
I tend to doubt it is the reason for this being the issue, however, but I'll now grant it wasn't as unreasonable a claim as I first thought.
Here's a video with RPM shown. And yes, even though it's my own video on my own car, I'm offering it as evidence that I was wrong about the shifts dropping the speed 3000 RPM.
http://www.eskimo.com/~mikeg/videos/...fa_evospin.wmv
Most of those shift were around 8400-8600 rpms or less. Probably because you cant take your eyes of the line. Even so you were dropping to around 7k each shift.
Registered User
Joined: Oct 2005
Posts: 3,375
Likes: 0
From: Houston
Originally Posted by chino101,Jul 15 2008, 08:08 PM
It just popped out of gear. Happened to me once.
Joined: Jan 2006
Posts: 4,953
Likes: 25
From: 17 ft below sea level.
9kFever Posted on Jul 17 2008, 02:18 AM
I made that same mistake too, one time.
But it isn't so.
Your total ratio per gear has changed, the total ratio being from crankshaft to wheel.
But the difference between the gears has not changed.
The rev drop is the same, just at a different road speed.
A 1-2 shift will have a rev drop of 3125 rpm.
In real life it will be more because the moment you disconnect the engine from the gearbox your car will slow down, pure physics.
There is no mysterious inertia or hidden force to keep accelerating your car when the engine is not doing it.
Unless you're driving downhill, it has to be pretty steep though to accelerate the car at the end of 1st
The syngro had to deal with the 3125 rpm. if you shift very fast.
Why don't you notice it being 3125 rpm or so?
Because when letting the clutch out after the 1-2 shift one's also "giving gas" to match engine revs to gearbox so the clutch disk (gearbox) is connected to an engine (the flywheel and PP) that's spinning a bit faster than the disk, the FW & PP grab it and accelerate it, as if your revdrop is only 2800 rpm.
I could show you my video to but realize I have 4.57s but even so the rpms drop less and less with each shift.
But it isn't so.
Your total ratio per gear has changed, the total ratio being from crankshaft to wheel.
But the difference between the gears has not changed.
The rev drop is the same, just at a different road speed.
A 1-2 shift will have a rev drop of 3125 rpm.
In real life it will be more because the moment you disconnect the engine from the gearbox your car will slow down, pure physics.
There is no mysterious inertia or hidden force to keep accelerating your car when the engine is not doing it.
Unless you're driving downhill, it has to be pretty steep though to accelerate the car at the end of 1st
The syngro had to deal with the 3125 rpm. if you shift very fast.
Why don't you notice it being 3125 rpm or so?
Because when letting the clutch out after the 1-2 shift one's also "giving gas" to match engine revs to gearbox so the clutch disk (gearbox) is connected to an engine (the flywheel and PP) that's spinning a bit faster than the disk, the FW & PP grab it and accelerate it, as if your revdrop is only 2800 rpm.
Registered User
Joined: Oct 2002
Posts: 2,057
Likes: 0
From: Hacienda Heights, CA
Originally Posted by SkyRollin,Jul 16 2008, 08:54 PM
Mine pops out of 2nd and 3rd sometimes when RPMs drop.. strange
There is a technical service bulletin for the 2nd gear popout (TSB-05-009).
I had mine fixed under warranty.
Registered User
Joined: Oct 2005
Posts: 4,057
Likes: 0
From: nc
Originally Posted by 9kFever,Jul 16 2008, 04:18 PM
Just watch this vid and you will see that with every shift the rpms drop less and less.
http://videos.streetfire.net/video/S...eedo_89953.htm
http://videos.streetfire.net/video/S...eedo_89953.htm
Thread
Thread Starter
Forum
Replies
Last Post