5 speed problems

Conn SVX · #1 10-17-2011, 08:34 AM

Well looks like we have a large # of 5/6 speed MT on here . So how many have had problems with the 5 /6speed conversion . What problems ( blown rears , blown clutches , blown tranny ,etc. ) Any comments about if they had to do it again would you, etc. what , if anything , would you do differently ? Add what conversion you have Tranny and ratio if you know !!!

Alex-svx · #2 10-17-2011, 10:48 AM

My only problem so far is that i not have my speed gauges work.
Other then that my tranny is still working. Just need a clutch that will handle the H6 power.

I have use a 1900 Legacy 2.2L tranny (3.900)

Conn SVX · #3 10-17-2011, 10:49 AM

How long have you had it as a 5 speed ?

huck369 · #4 10-17-2011, 11:11 AM

I've been running 5 speeds since I did the write up in 2001 (I think) and really haven't had any trouble from them other than cheap clutches WILL slip under a hard launch, I run the "Weaker" basic early Impreza 5-speeds, and have not destroyed one yet.
It's all in how you drive, if you plan to drag race it, clutch dumps WILL trash a tranny in short order (ANY tranny) but driven as a daily driver, even with some spirited driving thrown in the mix, the 5 speeds hold up fine

1986nate · #5 10-17-2011, 01:49 PM

Quote:

Originally Posted by huck369

I've been running 5 speeds since I did the write up in 2001 (I think) and really haven't had any trouble from them other than cheap clutches WILL slip under a hard launch, I run the "Weaker" basic early Impreza 5-speeds, and have not destroyed one yet.
It's all in how you drive, if you plan to drag race it, clutch dumps WILL trash a tranny in short order (ANY tranny) but driven as a daily driver, even with some spirited driving thrown in the mix, the 5 speeds hold up fine

This sounds mightily familiar to what I've been saying.

Green1995SVX · #6 10-17-2011, 03:01 PM

I had my original SVX swapped to an Impreza Brighton wagon 5 speed with the cable clutch. It had a 3.90 final drive. I never had any problems with it, and i REALLY beat the crap out of that car.

Hocrest · #7 10-17-2011, 03:05 PM

Quote:

Originally Posted by 1986nate

This sounds mightily familiar to what I've been saying.

You did your first first 5 spd write up in 2001???

Huskymaniac · #8 10-17-2011, 03:07 PM

Quote:

Originally Posted by huck369

I've been running 5 speeds since I did the write up in 2001 (I think) and really haven't had any trouble from them other than cheap clutches WILL slip under a hard launch, I run the "Weaker" basic early Impreza 5-speeds, and have not destroyed one yet.
It's all in how you drive, if you plan to drag race it, clutch dumps WILL trash a tranny in short order (ANY tranny) but driven as a daily driver, even with some spirited driving thrown in the mix, the 5 speeds hold up fine

Forget dumping the clutch for the moment. What if you were in fifth gear (5MT) and you floored the car until you either hit redline or your speed peaked? Would they withstand that and, if so, up to what HP engine could they withstand? What would be the limiting factor in this scenario? The clutch? The gears? Something else?

1986nate · #9 10-17-2011, 03:09 PM

Quote:

Originally Posted by Huskymaniac

Forget dumping the clutch for the moment. What if you were in fifth gear (5MT) and you floored the car until you either hit redline or your speed peaked? Would they withstand that and, if so, up to what HP engine could they withstand? What would be the limiting factor in this scenario? The clutch? The gears? Something else?

Why wouldn't they? There isn't much stress on the gears at that point. The thing there would be if the clutch would hold which with a proper clutch/pressure plate would be fine.

1986nate · #10 10-17-2011, 03:09 PM

Quote:

Originally Posted by Hocrest

You did your first first 5 spd write up in 2001???

Not that part ya smart a$$

Huskymaniac · #11 10-17-2011, 03:14 PM

Quote:

Originally Posted by 1986nate

Why wouldn't they? There isn't much stress on the gears at that point. The thing there would be if the clutch would hold which with a proper clutch/pressure plate would be fine.

At some RPM point (depending on the engine mod) one would be delivering max torque through the tranny. I guess it all comes down to how much torque the gears can handle. Do these supercharged monsters have special gears in them or just special clutches?

1986nate · #12 10-17-2011, 03:17 PM

Quote:

Originally Posted by Huskymaniac

At some RPM point (depending on the engine mod) one would be delivering max torque through the tranny. I guess it all comes down to how much torque the gears can handle. Do these supercharged monsters have special gears in them or just special clutches?

Kinda both, well nothing special. Just STI 6 spds, with I believe YT's former silver using a Stage 3 6 puck clutch I believe? Not sure what the others are running.

And it's the instant shock load on the gears that cause them to fail under abuse, aka clutch dumps or shifting like an idiot.

icingdeath88 · #13 10-17-2011, 04:44 PM

Quote:

Originally Posted by 1986nate

Kinda both, well nothing special. Just STI 6 spds, with I believe YT's former silver using a Stage 3 6 puck clutch I believe? Not sure what the others are running.

And it's the instant shock load on the gears that cause them to fail under abuse, aka clutch dumps or shifting like an idiot.

You are correct, shock loads will do far more damage than the sheer torque alone. So clutch dumping with a weak engine is harder on the trans than a much bigger engine at the peak of its torque curve. The clutch will have issues with both situations, but the gears will be fine under the second.

The difference with the 6-speeds is that all of the hardware inside is bigger and stronger, (and better lubricated, up to 06, so even heat is less of an issue). The the gears are really wide, with bigger teeth for more contact, the shafts that the gears ride on are bigger and stronger and flex less, the differentials are very big and beefy. Even the trans case has more meat and ribbing to it, so it's stronger and flexes less.