bigsnorlax

Although not specifically forced induction related i know, but running a large turbo throwing out big numbers seems the only way to break these trannys. My goal is nothing too crazy, but im wondering when people say "shooting for 700whp" can their trannys handle it? I assume someone capable (and with enough money) to build an engine that powerful knows how to handle tranny issues.

These trannys seem perfectly capable of handling twice and even triple the stock HP rating. but generally what is the breaking point of these transmissions? Are some stronger than others (B, D, F, H, etc.)?

blackeg

im likely wrong, but from what i see/hear, an oem trans with some decent aftermarket lsd hold up well into the 600hp range

siblues

iTrader: (1)

I was looking into getting my trans worked on and what I came up with is a oem trans can hold 600hp but the question is for how long and it all depends on how you use it.I spoke to Syncrotech and Mfactory and they both said that they need to be rebuilt for anything in that range.I know that they will push getting it built because thats good for business but if you plan on daily driving the car and making lots of power then you better plan on replacing parts in the trans.I say for 400 range you should be ok for a while.

Garage 808 Hatch

The power capabilities of the stock trans, is 100% dependent on the style of driving.

Blown90hatcH

And setup (Clutch, how it's assembled, etc.)

People break trans parts on stock cars and some people run stock trans and axles well into the 800whp range. This topic has been beaten to death. Do some searches and you will see many different options, topics, etc. Pre-load, non-harsh clutch, proper clearances and assembled, etc.....

92redhatch

I made 522whp with no tranny issues. I was told that after 650whp if you beat the car on the dyno 4th gear will strip. I also heard that at the track on slicks is when the trans gets messed up (650+whp). I plan on making 650+ And i plan on running a stock trans so ill See how it works out. But I have seen over 30+ track passes with 400whp with 24.5x9 mt slicks without an issue.

DelSolMarine

fluid and heat treatments can be beneficial as well for an oem transmission

bigsnorlax

I completely agree its based on clutch and driving habits. But for a commonly driven car i now see it holding 350 or so easily, Thanks guys. I always see that people strip or destroy 4th gear. Any reason to that mechanically? I dont know much about trannys

Desir Performance

I believe the same. On our cars we've found the stock diff is usually the first to go on a hard launch with slicks, then goes the gears. There many different things you can do to the stock trans before going dog box IE... Tilton valve, Heat treat gears, carbon twin disk, Quaif lsd, trans cuff, upgrade gear selector, aftermarket F/D, synchromesh oil, carbon synchros. etc... while these don't make the trans bullet proof it does help extend the life of the trans.

delslow45

dependent on clutch, lsd, and driving styles, but it tends to be a roll of dice once you get past 400 hp or so in my experience. some hold up past 600-700, some don't wanna go past 300. seen dozens of s20's break/bend those aluminum shift rods on lower numbers, never seen it on any obd2 trannies tho...

CDecker0218

normally pending how how your driving is they can handle around 650-700whp.

AutoSensei

I always thought it was actually torque and poor driving habits that destroyed transmissions.

coupe__88

Horsepower comes from torque (check out the equation for hp) One reason I am not a fan of super grippy clutches is because it allows you a weak point in the drivetrain. As much of a PITA that it is to replace a clutch, they are much cheaper than transmissions.

96 GSR-T

You are more likely to destroy a tranny with a stiff sidewall tire (street tire/drag radial) than running slicks.

Tranny's are hit or miss, usually 600whp is where things start breaking. I was making 585/385 on my tranny, drove it for 3k miles on the street without an issue, same tranny went into my friends car last year making the same power, so far 60 hits on the dyno and probably 30 passes and its still together and we recently retuned it for another 150whp so we will see how long it lasts.

B20luda

i mde 520 on a stock H tranny for 2 years with an LSD dragger clutch no issues, later on made 600whp with a twin disk clutch and broke 3 within a year

extralargenog

iTrader: (1)

As a general rule... Above 380 TQ, **** breaks. HP doesnt have anything to do with it.


I broke 12-14 in a year at 520/380 on pump and 650/460 on RG.

I got a straightcut set and im making 750/575 now... Well see how it works out. The straightcuts saved me at the lower power level....

96 GSR-T

The weight of your car makes a big difference as well, werent you breaking tranny's in a heavy car?

extralargenog

iTrader: (1)

Yes. To be fair it hooks well too. CD5 Accord

bigsnorlax

Wow that **** is impressive haha.
Im just hoping i get around 350whp whenever i can afford the last few things and get it running. The plan was to go as big as i could without worrying about tranny issues so looks like ill be well in the clear especially with the turbo im using 400+ whp or probably wont happen not too mention even making that kind of torque wow.

I think i saw your CD5 on you tube... you have some dyno videos dont you extralarge? Looked like you were riding on OEM 7 spoke alloys with street tires, i can only imagine what that would be like on the street

extralargenog

iTrader: (1)

OEM steel wheels, M&H 235/60-15 Racemasrters and OEM hubcaps. The ricer wheels havent been on it for 3 years :O)

Car hooks very well up to 600-650 WHP or so. At 520 on pump it dead hooks with BBG


Also to be fairt, both B20LUda and I run a Tilton valve too, but its not the shift thats breaking the gears... Its always under power they break.

blackeg

i have well over 100 passes on my trans with bfg radials and 400whp. before me the trans was going 10's in a friends car, before that it was in a car that i believe made a 9 second pass. the causualty was the obd lsd. whatever thats to be expected id say. i recently installed an mfactory unit and things are good to go. the gears and syncros themselves are in excellent condition, no grinding or popouts with shifts at 9000 and somewhere around 8000 miles per year. (had it for i think 3 years now). im also using an act xtr6 6 puck setup. i do go through at least 1 clutch disk per year however...

BoostR41

I've been making 550 to 583whp and between 399wtq and 379wtq with comp stage 5 unsprung with upgraded pressure plate for 6 years on a stock, never opened ITR tranny. probably 75 pulls on the dyno and who know how many trips to the track on radials and slicks. Last event it was tough to shift so I will probably open it soon and check stuff but still shifts at lower RPMs like butter.

extralargenog

iTrader: (1)

What motor/Bore Turbo trans?

boca

i heard b-series tranny are better than k-series tranny

turboda4dr

this thread is great.