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| higher/lower stall torque convertors http://auszookers.com/forum/viewtopic.php?f=5&t=52772 |
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| Author: | tanshi [ Thu Jul 07, 2016 11:05 am ] |
| Post subject: | higher/lower stall torque convertors |
So I know the basics of how these things work, the higher rated stall rpm a TC has the higher up the revs are when it reaches the point where it "locks".. correct? I also know that the way they work the more torque the motor puts out effects how and when the tc "locks" I was reading a guys post the other day and he was talking about his offroad buggy and the fact that he ran a 3000rpm TC in his ls powered buggy but it was too high for crawling. he has now moved down to a 1800 TC and it should be much better crawling but "he will miss the 3000 in and out of corners when racing" this is the part I don't understand. if the 1800 locks up earlier making crawling better how would the 3000 be better in and out of corners at speed? the reason I ask is im building a racing buggy with a h27a v6 and vitara auto. looking at converters will the stock one be ok for its stall rating or do I need to look at different convertors.? |
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| Author: | Gwagensteve [ Thu Jul 07, 2016 11:15 am ] |
| Post subject: | Re: higher/lower stall torque convertors |
I'm on my phone at work but basically, the higher stall means the motor is making more torque when the converter locks so when old mate punches it out of a corner, revs flash to 3k and the car pulls hard. If the converter locks at 1800 the motor isn't making much torque down there so acceleration will be slow. Think of it like dropping the clutch on a manual- compare acceleration between dropping the clutch at 1800 vs 3000rpm. |
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| Author: | tanshi [ Thu Jul 07, 2016 11:18 am ] |
| Post subject: | Re: higher/lower stall torque convertors |
ahh right, that makes perfect sense. thanks steve. the higher stall would cause heating issues in a crawling car whouldnt it, due to the tc slipping all the time until it locks? |
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| Author: | Gwagensteve [ Thu Jul 07, 2016 12:00 pm ] |
| Post subject: | Re: higher/lower stall torque convertors |
Correct. However, how much your converter slips when crawling is a function of how much gearing you have. Lower gears mean less slip. My converter barely slips at all in low range. |
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| Author: | tanshi [ Thu Jul 07, 2016 12:33 pm ] |
| Post subject: | Re: higher/lower stall torque convertors |
ill have heaps of gearing in low 3.32 transfer and 5.29 diffs ill be running a 1.6 vitara 4 speed auto behind the h27a so ill have the 250mm TC on it rather than the 260mm v6 one so that's gonna raise the stall from the standard 1800 I believe they are built too. not to mention that it will be running 250NM at 3000rpm vs the 132 at 4000 so this will push the stall up higher aswell. might have to hunt around and see if I can find some sort of calculation for it |
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| Author: | Gwagensteve [ Thu Jul 07, 2016 1:16 pm ] |
| Post subject: | Re: higher/lower stall torque convertors |
It's pretty much impossible to predict/calculate for combinations that aren't well proven. Vehicle weight also has a large bearing. Bear in mind that stall speed also applies under engine braking too- high stall= no useful engine braking until the converter is spinning that fast. |
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| Author: | MrRocky [ Thu Jul 07, 2016 1:35 pm ] |
| Post subject: | Re: higher/lower stall torque convertors |
Not all aftermarket/custom converters are equal quality it all comes down to the builder/design well at least it is in drag racing circles, id say it would be even more important for regular offroad use and longevity |
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| Author: | Bulldog 61 [ Thu Jul 07, 2016 6:59 pm ] |
| Post subject: | Re: higher/lower stall torque convertors |
Highway Automatics, talk to Neil the owner |
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