adam_ferguson

hey does anyone know what the 3650 is rated for ft/lbs wise max?

2000GT4.6

You can probably find a rating somewhere, but its not going to really tell you when it is going to break. 99.99 percent of troubles in our transmissions arnt from the hp/tq, but from agressive shifting and hard launches.

I went thru 2 t-45 in short order because I shifted the car hard and damaged syncronisers. Usually thats what happens, you damange a sync and it starts to grind, and before long you damage a gear.

Regardless, power wise your ok well over 400 WHP with teh 3650 if you arn't launching hard and powershifting. If you are, its a crapshoot, you might get away with it and you might not.

adam_ferguson

ya i was thinkin about cappin about 450 rwhp on a blower and was concerned.

2000GT4.6

There are a couple guys making that and more with the 3650, but if you drive it hard/often its only going to be a matter of time before something goes.

450 WHP is right on the limit of the stock motor, your much safer in the 420-430 range.

cliffyk

The T-3650 is rated for 360 ft.lbs, here's a link to their website. That is of course 360 HP @ 5252 rpm, which means that by the time you get to 300 HP peak you could easily break it by banging on it hard...

contentsunderpressur

Don't listen to the ratings. I've run 400 hp through mine for two years with no problems. You just have to treat it right, no speed shifting. I always let off the gas and push the clutch all the way down when I shift. You might not run quite as fast but it'll save your tranny. I've seen a ton of cars break the 3650s with no engine mods at all. It's all about how you shift it.

cliffyk

360 ft.lbs. is the manufacturer's rating, I.e it's as much as they feel comfortable stating on the spec sheet and being held liable for. [/align][/align]If you assume a 25% design service factor (pure speculation, but a reasonable number) then thepotential point offailure load calcs out to 480 ft.lbs (360 * 0.75^-1) , or 480 HP at 5252 rpm...[/align]

2000GT4.6

There just isn't any certian point you can say "it will break here". Driving/shifting habits, how hard you launch, etc etc will all play a factor.

nanaki

i don't powershift or launch the hell out of my car (mainly because i don't want to kill my axles) and my 3650 has held up just fine. i've got 547RWHP 490RWTQ running through it and never had a problem.