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View Full Version : Tranny life and death thread



fre$h si
07-19-2011, 12:57 PM
For a lot of us it has happened and also a good amout it hasnt...but we gotta face the facts...our trannys arent anything special.

so what was the story with your tranny?

please list:
* hp & tq numbers
* miles boosted
* 5sp or 6sp tranny
* clutch
* driving style
* what went wrong with it if it took a dump

boosted_teg
07-19-2011, 09:57 PM
* hp & tq numbers
350 and 272

* miles boosted
35000km

* 5sp or 6sp tranny
5 speed base , 6speed 1-2

* clutch
act heavy duty pressure plate, 6 puck sprung

* driving style
always in boost lol i like to drive it

* what went wrong with it if it took a dump
so far, i have a 3rd gear synchro thats on the way out. high rpm it will grind going in.


I dont expect it to last past summer once i get it to the 500whp mark. Only thing saving me so far, is its a 2.0 motor, not 2.4

vdubkilla
07-19-2011, 11:49 PM
well so far so good but its a ticking time bomb I know its gonna happen .I was putting down 463 / 304 for about 1000 miles then was putting down 501/314 pump 576/376 Q16 for about 600-700 miles and now putting down 522/338pump and 585/414 Q16 .Trans seems good so far one thing I will not do is launch it hard on the street and dont do burn outs either .I do run the shit out of it once rolling though . I have had it down the track a few times launching at 4600 , 5600 and now 6500 .I did buy two spare transmissions as back up but havent needed them yet .The car is gonna hit the track this week , and again on aug 6,7 at MIR for import revolution as long as all goes well .It will be my first big event with the car :pray:

fre$h si
07-20-2011, 07:42 AM
teg, do u launch ur car hard ever?
Vdub, Dam now I have hope that it'll last a while since ur able to put down 500+ lol

I'm wondering what's the golden number for when it'll break. Don't really feel like having my car on jack stands again :(

Thanks for the replys keep em comming!! Btw what stage Cluthes r u guys on?

boosted_teg
07-20-2011, 10:01 AM
k24s love to break trannys with over 500whp, just because of the torque they make compared to the 2.0. I dont launch my car on the street. At the track last year i was launch at 7000 rpm with 4psi on 23" slicks.

Si Speed 317
07-28-2011, 02:01 PM
I'm afraid to post because I'm superstitious :nervous:

06_typeS
07-28-2011, 10:47 PM
^ I agree

PetefromtheStreets
07-29-2011, 08:21 AM
So far so good for me.

I have a 6speed

Boosted for ~10k miles

I drive it pretty hard. Wot shifts and all.

Track launch at 7500 on 24.5" slicks makin about 14 psi on the line.

I have a comp clutch stage 4 with a factory flywheel.

We'll see how it goes once tuned again.

Si Speed 317
07-29-2011, 10:28 AM
Well, I seem to have shitty luck. My first gear is whining - why is it doing this? Here's a video:

JvB4nADSa0k

PetefromtheStreets
07-29-2011, 03:51 PM
Well, I seem to have shitty luck. My first gear is whining - why is it doing this? Here's a video:

JvB4nADSa0k

Change your tranny fluid. That should help some. But mine whines and has had no issue.

Si Speed 317
07-30-2011, 07:16 PM
I'll be doing that this week for sure

Spaz
08-03-2011, 06:01 PM
I made a thread about all of my tranny parts... I'm on my 5th transmission..

319whp 243lb torque. K24 supercharged DC5. I have shattered 2nd gear every single time.

fre$h si
08-04-2011, 03:04 AM
omfg 5th?!?!?!?! im surprised u still have the car lol. everyone quits after the 2nd one goes out lol

Spaz
08-04-2011, 01:15 PM
omfg 5th?!?!?!?! im surprised u still have the car lol. everyone quits after the 2nd one goes out lol

I'm also on my 4th engine hahahaha

PetefromtheStreets
08-04-2011, 10:32 PM
I'm also on my 4th engine hahahaha

Daaamn! (jaw drops to floor)

Spaz
08-05-2011, 02:02 PM
Daaamn! (jaw drops to floor)

First engine (k20z1) I did the ol' Money Shift... 3rd to 2nd and blew it up.

Second engine (2005 k24a2) was good until I went to a new tuner for my aftercooler setup and he blew up my engine....

Third engine, (2007 k24a2) I bought after tuner blew last one up and drove for a month and noticed smoke.. compression tested it, it turned out to be bad from the place I bought it. Luckily it came with warranty so they gave me another one.

Now my forth engine is aother 2007 K24A2 replacement for a low compression engine from the salvage yard I bought.

Spoolin_VTEC
08-09-2011, 10:42 AM
Spaz, that's insane! I'm on my first tranny and first motor :rotfl:

vdubkilla
11-28-2011, 11:22 PM
Dam this thread makes me feel lucky stock ep3 trans with a quaife diff first turbo 30r in april 463 hp 314 trq , may went to a 35r 522 / 322 on pump gas and 585 / 414 on q 16 race fuel .I feel really lucky the trans held up all summer w/o issue I will say forth gears been noisy for a while but the trans is gonna come apart this winter to have a look .Best advice I can give you is dont launch it on the street and run slicks at the track mines held up to multiple passes at the track this year at least 20 -30 passes and many many many pulls to top end :turbohug:

06_typeS
11-29-2011, 09:36 PM
Quick question for the Si guys. Are you running your stock LSDs? How have they held up from the abuse you put them through? I found a K20a2 with an Si LSD in it. Buddy is asking $750 though. Is that steep?

Spaz
11-29-2011, 10:29 PM
Here is some of my collection...

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5687-1.jpg

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5688.jpg

from best to worse... all the same gear...... :face:
http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5695.jpg

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5693.jpg

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5692.jpg

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5691-1.jpg

and some other misc broken pieces from my adventures
http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5698-1.jpg

http://i133.photobucket.com/albums/q71/zzfunk13/k20%20trans%20teeth/100_5699.jpg

[IMG]http:/

vdubkilla
11-29-2011, 10:59 PM
Holy Christ ! Spaz that shit is wacked how much power were you making ?

Spaz
11-29-2011, 11:22 PM
Holy Christ ! Spaz that shit is wacked how much power were you making ?


My torque is instantaneous and intense. I make 247lbs of torque by only 2700rpms :) It's an instant kick in the dick for my poor transmission...

vdubkilla
11-29-2011, 11:36 PM
yeah my last car was a supercharger gsr and the instant shock is tough on things especially on radials and w/o pre loading things break .I broke three axles in the old hatch and one final drive in it .So far the k series trans has handled everything I have thrown at it and that is even hard for me to believe as I know what its been thru :nervous:

VTECFRED
07-30-2012, 08:06 PM
Stage 4 competition clutch and fly wheel

I have been slowly working my way up in power. I started out with a small boost setup at 278HP drove and tracked that for 10k miles.

Upgraded my fuel system and made 384HP. Drove and tracked that for another 9k miles.

I built the motor in Jan 2012 and finished April 2012

Made 421HP on 13psi

Did more tuning hit the dyno again and made 443HP

Ran this power level for 2 weeks about 1200 miles (Drove to tracks on the weekends)

Did more tuning and made 455HP/389ftlbs drove at this power level for 100 miles and broke 4th gear. Sounds like aluminum cans and rocks when I put it in 4th gear lol

Si Speed 317
07-30-2012, 10:41 PM
I'm afraid to post because I'm still superstitious :nervous:

This.

VTECFRED
07-31-2012, 11:46 AM
I think my transmission problem was exacerbated by the fact my clutch was slipping. You would think the clutch slipping would help protect the transmission but I am thinking because it only slipped a little then it would catch instantly that put a shock load on the transmission. Like a 6krpm launch



Sent from my Galaxy Nexus

Spaz
08-01-2012, 11:35 AM
I think my transmission problem was exacerbated by the fact my clutch was slipping. You would think the clutch slipping would help protect the transmission but I am thinking because it only slipped a little then it would catch instantly that put a shock load on the transmission. Like a 6krpm launch



Sent from my Galaxy Nexus

never thought of that...

vdubkilla
08-01-2012, 10:18 PM
these transmissions take a beating last year stock trans w/ quaife 585 / 414 it did great til December with multiple x mutiple x a shit ton of pulls :lildevil:

fre$h si
08-02-2012, 12:21 PM
yeah my last car was a supercharger gsr and the instant shock is tough on things especially on radials and w/o pre loading things break .I broke three axles in the old hatch and one final drive in it .So far the k series trans has handled everything I have thrown at it and that is even hard for me to believe as I know what its been thru :nervous:

Sorry for the noob question but what Is preloading?

VTECFRED
08-02-2012, 12:29 PM
these transmissions take a beating last year stock trans w/ quaife 585 / 414 it did great til December with multiple x mutiple x a shit ton of pulls :lildevil:

What clutch?

Sent from my Galaxy Nexus

VTECFRED
08-02-2012, 12:30 PM
these transmissions take a beating last year stock trans w/ quaife 585 / 414 it did great til December with multiple x mutiple x a shit ton of pulls :lildevil:

So I should just buy a quaife?

Sent from my Galaxy Nexus

Spaz
08-03-2012, 08:57 AM
My quaife is the only thing that hasn't busted... and it has a guarantee which is nice !

Si Speed 317
08-04-2012, 08:53 PM
Quaife is the shit. Just saying.

fre$h si
08-06-2012, 01:14 PM
How does it compare to oem LSD? There's a guy 07blksi and he now has a quaif and omg he tracks his car harder than any Si I've seen vids of on a stock tranny and he probably had 2 yrs on it before it broke again. I wonder if a legit LSD could help tranny wreckage?

VTECFRED
08-06-2012, 01:47 PM
How does it compare to oem LSD? There's a guy 07blksi and he now has a quaif and omg he tracks his car harder than any Si I've seen vids of on a stock tranny and he probably had 2 yrs on it before it broke again. I wonder if a legit LSD could help tranny wreckage?

In for the answer. Does adding an aftermarket LSD help save the tranny?

Sent from my Galaxy Nexus

Si Speed 317
08-08-2012, 04:58 PM
In for the answer. Does adding an aftermarket LSD help save the tranny?

Sent from my Galaxy Nexus

+1, in for answers as well.

PetefromtheStreets
08-09-2012, 12:10 PM
Adding an aftermarket LSD won't help save the tranny. You figure all the LSD is doing is transferring power to the wheels through the gears. The gears will get abuse with any differential in there.

Also it depends on how the cars driven. Ex. Does he take his time when shifting,does he feather the clutch out after a shift to minimize shock to the gears, also drag radials put more abuse on a transmission then slicks do. The slicks give you some cushion while radials have a street tire like sidewall

VTECFRED
08-09-2012, 12:52 PM
Awesome, good to know.

Sent from my Galaxy Nexus

aLmk
08-09-2012, 05:11 PM
Sorry for the noob question but what Is preloading?
Preloading is a method of launching where you rev to your desired rpm with the emergency brake pulled with finger on the lock. Then you start to raise the clutch to the point where it is pretty much catching and the car wants to move forward, but you are preventing that by holding the emergency break. Then when its time to go you drop the e-brake and go. Someone on here made the analogy that launching without preloading is like hitting a brick wall with a hammer as hard as you can, and launching with preloading is like placing the hammer on the wall with little force, then applying as much pressure as you can.

Si Speed 317
08-10-2012, 10:30 AM
^ Great analogy. I like that

fre$h si
08-12-2012, 04:17 AM
Preloading is a method of launching where you rev to your desired rpm with the emergency brake pulled with finger on the lock. Then you start to raise the clutch to the point where it is pretty much catching and the car wants to move forward, but you are preventing that by holding the emergency break. Then when its time to go you drop the e-brake and go. Someone on here made the analogy that launching without preloading is like hitting a brick wall with a hammer as hard as you can, and launching with preloading is like placing the hammer on the wall with little force, then applying as much pressure as you can.

ya i found out the other day from a friend. he let me launch his stock 4door, launces so much better with preloading!!

aLmk
08-12-2012, 04:05 PM
Yeah I plan to try it at the track next time I go. I think what I'll do is start out doing it from a low RPM like 3k and slowly work my way up to like 6500 or so to get the hang of it and see what rpm works best. Hopefully I'll eventually dip into the 12's!

Si Speed 317
08-16-2012, 11:41 AM
I like the hammer/wall analogy. Definitely going to keep that in mind for the future :thumb: Do you need to preload the clutch with the e-brake though?

aLmk
08-16-2012, 08:53 PM
Yea you need to use the e brake to keep yourself from moving.

Si Speed 317
08-19-2012, 01:29 PM
Makes sense, must take a nice layer of material off your clutch though..

aLmk
08-19-2012, 10:08 PM
Yea definitely wears the clutch.

vdubkilla
10-01-2012, 09:16 AM
Dam I hadn't read this this thread in a while and but I'd rather take a little off the clutch than break an axle or transmission.I can't wait to get my car back together and hit the track again its been apart a while and I have a fresh minty trans all ready to go gonna try to make some more power on it and hope it holds up again like the last one did .I am gonna have to build a trans this I know but $$$ . I am not going to be able to compete consistently til I do and I love the race track to much to break mid season

snizzletoff
10-01-2012, 12:46 PM
^that! a clutch is a a cheap replacement, especially since its a wear item. Transmissions are a very expensive fix.