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| LS4 / F40 swap - fieroguru (Page 134/216) |
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wftb
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MAR 09, 10:42 PM
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Mount a generator there and put an electric motor in the front. Drive by wire.
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fieroguru
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MAR 11, 10:29 AM
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| quote | Originally posted by wftb:
Mount a generator there and put an electric motor in the front. Drive by wire. |
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That has already been done, so what's the fun/challenge in that?
For me it is more about the journey than just getting to the destination.
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wftb
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MAR 11, 02:27 PM
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I have thought about 4wd but it always boils down to is it worth all the work? I don't really know. There is the problem of where to put the driveshaft. Moving the fiero tank will hurt the balance of the car, it is in the perfect spot now. A custom gas tank with a tube in the middle to route the drive shaft through?
As far as it being done before yes there are a lot of hybrid drive trains out there but no one has done one without a battery pack.
There is an exoskeleton rear mid engine/all wheel drive car on the locost forums using I believe Mitsu Evo drive train. I will see if I can find a link, the info is kind of skimpy but maybe you might see something that will give you some more ideas.
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wftb
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MAR 11, 02:32 PM
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Will
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MAR 12, 08:20 PM
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| quote | Originally posted by Rickady88GT:
You will also need to flip the front differential. |
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| quote | Originally posted by fieroguru:
Correct. |
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Depending on the shaft rotation direction, you may just run the front diff from an AWD Porsche 996. That has the viscous coupling built into the front axle unit.
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Will
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MAR 12, 08:24 PM
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| quote | Originally posted by fieroguru:
I "think" the cases are very similar if not the same, but the passenger side jackshaft that passes through the AWD unit has 2 different part numbers between the Auto and Manual and I suspect the difference is in how far it protrudes past the mounting flange for the AWD unit to the transaxle. |
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Spur gear to offset downward, then spiral bevel to transfer to rear driveshaft?
Sounds like a DSM...
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Will
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APR 07, 10:02 PM
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Soooo.... Is the bevel set a spiral bevel or hypoid bevel?
If hypoid and you turn it around, the shaft will end up higher, which may interfere with your crankshaft...
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fieroguru
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APR 08, 07:07 PM
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| quote | Originally posted by Will:
Soooo.... Is the bevel set a spiral bevel or hypoid bevel?
If hypoid and you turn it around, the shaft will end up higher, which may interfere with your crankshaft... |
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I haven't had any free time to mess with it, but I assume it is a hypoid with a small offset from the the ring gear center line. So when I flip it 180, its vertical placement won't change much.
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ericjon262
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APR 08, 11:48 PM
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just a thought that might help with packaging, how about a drive cable instead of a shaft, probably not super efficient, but I would imagine it's possible.
https://www.elliottmfg.com/...ucts/flexible-shaft/------------------
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
"The day I tried to live, I stole a thousand beggars' change and gave it to the rich."
http://www.fiero.nl/forum/Forum2/HTML/119122.html
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fieroguru
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APR 10, 07:59 PM
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Finally took one of these Saab AWD units apart...
The center-line of the pinion gear is about 7/16" lower than the center-line of the ring gear, so flipping it 180 will raise the output shaft about 7/8". That will place it about 3 5/16" below the F40 axle center-line. The F40 axle center-line is about 2 13/16" below the crankshaft center-line, so centerline to centerline between the AWD output shaft and the engine crankshaft should be close to 6 1/8"... which means the output shaft should have room to clear the crankshaft.
Some other important info:
Splines on passenger side intermediate shaft: 27
Splines on AWD power takeoff from differential: 38
Gear teeth on hollow drive tube: 35
Gear teeth on ring gear shaft: 26
Gear teeth on actual ring gear: 31
Gear teeth on pinion gear: 15
Overall ratio has the pinion output shaft spinning 2.781 times faster than the F40 differential RPM.
I still need to collect a F40 AWD differential with the female spline shaft to drive the AWD unit as well as the front differential.
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