Bullet Proof Transmission
Originally Posted by RUEHL925,Jun 6 2007, 10:30 PM
Sounds like 1, CDV is slowing things down too much, and/or 2. the clutch isn't dis-engaging far enough when you depress it. My stock tranny has been bullet proof and I routinely run 9600 RPM full power shifts with a cold transmission (okay 30 seconds of warm up). The data logs say the 1-2, 3-4, and 5-6 shifts are 3/10ths to 4/10ths of a second with the 2-3 and 4-5 shifts at about 5/10ths to 6/10ths.
And this is with the engine and tranny behind me and working things through five feet of shift linkage. BTW, Amsoil synthetic manual tranny oil, although it worked just as well with Mobil 1 75w.
From what I know about it (not much, BTW) I'd say find some way to dis-connect the CDV.
All the best,
Jim
And this is with the engine and tranny behind me and working things through five feet of shift linkage. BTW, Amsoil synthetic manual tranny oil, although it worked just as well with Mobil 1 75w.
From what I know about it (not much, BTW) I'd say find some way to dis-connect the CDV.
All the best,
Jim
2. the clutch isn't dis-engaging far enough when you depress it.
I have heard many "experienced" drivers with many years of manual transmission driving say that you only need to disengage the clutch as far as is needed to complete a shift. This is complete
and will cause you do destroy your syncros. When you shift the pedal must go all the way down until it hits and stops, then shift, then let it out. For some the shorter throw of the stock shifter will cause them to grind the 1-2 shift simply because they're left foot isn't keeping up with their right hand.And for those of you have suggest dog gears, have any of you actually driven them? When I had inquired about them at my old Porsche race shop, the consensus was that they would not work for the street because you would either need to bang-shift every single shift and/or you need to double clutch every shift.
Originally Posted by AssassinJN,Nov 15 2007, 09:03 AM
This is a huge point that I am surprised no one brought up in here until now. I have had my '01 for about a year and a half now and have only miss shifted a handful of times. All were driver errors, and all were caused by my foot moving at a different time then my hand.
I have heard many "experienced" drivers with many years of manual transmission driving say that you only need to disengage the clutch as far as is needed to complete a shift. This is complete
and will cause you do destroy your syncros. When you shift the pedal must go all the way down until it hits and stops, then shift, then let it out. For some the shorter throw of the stock shifter will cause them to grind the 1-2 shift simply because they're left foot isn't keeping up with their right hand.
And for those of you have suggest dog gears, have any of you actually driven them? When I had inquired about them at my old Porsche race shop, the consensus was that they would not work for the street because you would either need to bang-shift every single shift and/or you need to double clutch every shift.
I have heard many "experienced" drivers with many years of manual transmission driving say that you only need to disengage the clutch as far as is needed to complete a shift. This is complete
and will cause you do destroy your syncros. When you shift the pedal must go all the way down until it hits and stops, then shift, then let it out. For some the shorter throw of the stock shifter will cause them to grind the 1-2 shift simply because they're left foot isn't keeping up with their right hand.And for those of you have suggest dog gears, have any of you actually driven them? When I had inquired about them at my old Porsche race shop, the consensus was that they would not work for the street because you would either need to bang-shift every single shift and/or you need to double clutch every shift.
This may be a noob question but when you say "grind" is it audible?
I feel the synchros engaging but just describe it as notchy. Im taking it grinding 1-2 shifts stands out at you. Perhaps ive never experienced it.
I feel the synchros engaging but just describe it as notchy. Im taking it grinding 1-2 shifts stands out at you. Perhaps ive never experienced it.
This is my first manual transmission. I'll admit that I've missed shifts and ground gears. Every single time, and I mean EVERY single time, I was able to point to mis-timing between my release of the clutch and throw of the shifter (what Assassin was pointing out).
Of course, I've worked hard to make sure that I depress the clutch pedal all the way, every time. Makes it that much harder to screw up the timing.
As for a lightened flywheel, I recently had the OEM clutch replaced with the ACT HD street clutch and PP and had an AP1 flywheel put in (what the shop already had resurfaced and in stock). It does change the way I shift, I had to really concentrate the day I drove it home from the shop to make sure I didn't miss a shift. However, I did notice the car seems to be more eager to accelerate than it did before (the purpose of putting in the lighter flywheel).
Do I still hear grinding when I shift? Every now and again, I get in a hurry and miss a shift. Cheesy as this is, a quote from a movie: "Slow is smooth, smooth is fast" (or something like that).
Of course, I've worked hard to make sure that I depress the clutch pedal all the way, every time. Makes it that much harder to screw up the timing.
As for a lightened flywheel, I recently had the OEM clutch replaced with the ACT HD street clutch and PP and had an AP1 flywheel put in (what the shop already had resurfaced and in stock). It does change the way I shift, I had to really concentrate the day I drove it home from the shop to make sure I didn't miss a shift. However, I did notice the car seems to be more eager to accelerate than it did before (the purpose of putting in the lighter flywheel).
Do I still hear grinding when I shift? Every now and again, I get in a hurry and miss a shift. Cheesy as this is, a quote from a movie: "Slow is smooth, smooth is fast" (or something like that).
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