JacktheRiffer Posted February 5, 2016 Share Posted February 5, 2016 What is everybody running? My goal is 400whp and Ive been looking into the ka swap but Im not sure it will last long at that power. TL:DR - will a ka24 tramnsmission hold 400whp for a decent amount of time? Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted February 6, 2016 Share Posted February 6, 2016 Have you considered the trusty T5? You won't be at 400hp on a 100% duty cycle. I bet it would hold up fine. And the car may have come with one. Quote Link to comment Share on other sites More sharing options...
Tony D Posted February 6, 2016 Share Posted February 6, 2016 There's this nice sequential box out of Australia that's good to 1000 ft-lbs... Quote Link to comment Share on other sites More sharing options...
Xnke Posted February 6, 2016 Share Posted February 6, 2016 The T5 won't live. At 300ft-lbs of input torque they start breaking quickly, and be honest-you aren't going to baby it around. Not all the time, anyway. The FS5W71C transmission will live at 300ft-lbs input torque for a while, but it will wear out quickly. The FS5W71E transmission has some upgrades and can be strengthened further from stock, but again, limited life at the power you're talking about. When upgraded internally with stronger, bigger bearings (a lot of complicated machining required and I'll never do it again) I hope to get decent life out of mine. The FS5R30A is the go-to here for strong transmissions. It's a lot of work and they're a bitch to rebuild, but once assembled properly and fitted to the car, it will last a long time under severe service. Quote Link to comment Share on other sites More sharing options...
weedburner Posted February 7, 2016 Share Posted February 7, 2016 The T5 won't live. At 300ft-lbs of input torque they start breaking quickly, and be honest-you aren't going to baby it around. Not all the time, anyway. It's not the 300ft/lbs that kills the transmission, it's the intense inertia energy release that happens when engine rpm is pulled down quickly. Even a 250hp engine can easily generate a 700+ft/lb torque spike at the input shaft, all it takes is an aggressive clutch coupled with sufficient traction. A T5 can easily live at 400whp, you just need to pay attention to what clutch is in front of it. If clutch capacity is < 500ft/lbs or so, you will probably be fine. The T5 input shaft i have here on my desk has a minor dia of around .760" in the spline area. I'm not sure what alloy it is, but a treated 8620 shaft of that size would have a yield strength of about 1000ft/lbs. Mustang Cobra clutches are a pretty good match for a T5, lots of Mustangs running low 11's to high 10's 1/4's with a T5 using that clutch...they have a 10.5" organic disc and a PP load of around 2124lbs, shouldn't be too hard to come up with something close that will fit. Bottom line is you don't have to be afraid to run slicks if you choose the right clutch. Quote Link to comment Share on other sites More sharing options...
seattlejester Posted February 7, 2016 Share Posted February 7, 2016 If hoke is still making the adapter 350z transmission should be able to hold that much power. Quote Link to comment Share on other sites More sharing options...
JacktheRiffer Posted February 8, 2016 Author Share Posted February 8, 2016 I have the t5 that came with the motor. And there is no way this car will be babied ever. The FS5R30A is the z32 transmission? Or is it something else? Quote Link to comment Share on other sites More sharing options...
jmhtx Posted February 10, 2016 Share Posted February 10, 2016 What are the differences between the FS5W71C transmission and the FS5W71E? My goggle fu is weak on this one. What makes is stronger? Can the FS5W71E can bolt up to the L28 in the same way the FS5W71C can wiht a modified A or B bellhousing. Quote Link to comment Share on other sites More sharing options...
Xnke Posted February 15, 2016 Share Posted February 15, 2016 The E is the 5 speed that was fitted behind the VG30E and VG33ER in (some) Nissan Frontier pickup trucks, the only changes are internal. All of the gear teeth are wider and the midplate is thicker, which allowed me to fit almost double the bearings into mine. Yes, the E will bolt up in the same method. You can not modify an "A" bellhousing to fit, you must use a "B" or "C" bellhousing (both exist for the L6) I would definitely be on the lookout for a diesel transmission, as they had cast steel front bearing plates instead of the alloy ones that the rest of the transmissions got. They are not spectacularly easy to find these days. If you ask me, I'd not run anything less than a Z32 transmission if I was going to upgrade. It's not that much extra work and it's pretty much on par with all the other transmissions as far as "work needed to make it fit" so best to do it once and call it a day. Quote Link to comment Share on other sites More sharing options...
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