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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-07-2006, 06:04 PM   #11
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Quote:
Originally Posted by pontiacjeff
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Originally Posted by 95naSTA
Holy crap.
Is that d/* cover even going to fit in the engine bay? Or are you going to have to shift the engine over to the p/* side?
The rear of the side cover is the exact distance that the W-body trans mount is from the bellhousing face. I might make a frame stand off and use a side mount like the w-body or just keep the front/rear mounting config like the H-body uses. I'd almost rather use the W- with it'* upper dogbone config.

One other thing... the -80 centerline is ~.375" wider than the -60/-65 (9.500" vs. 9.125") so the axles will have a slight rearward slant... not nearly enough to even give a second thought about.
So if you decide to keep the bonneville torque-axis mount on the p/*.. Will the tranny clear the other side of the engine bay?
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Old 02-07-2006, 06:04 PM   #12
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Quote:
Originally Posted by Hans
Quote:
Originally Posted by 95naSTA
Holy crap.
Is that d/* cover even going to fit in the engine bay? Or are you going to have to shift the engine over to the p/* side?
jeeeze that makes the l67 look so small...


curious to know how much better the 4t80'* hold up vs a modded 4t65e w/LSD
Ya, it does. I'll take some pics tomorrow comparing the -65 and the -80. I know it weighs about 100# more! And gobbles up more power, too. However, the "new" 3.71 FDR will more than make up for any additional power absorbtion the -80 incurs.

I might actually have to do the install b4 the twin-charging (wating on the turbo to be built), so I'll know the additional power loss incurred (if any). I'm really thinking it'* a good idea to work out all the trans swap bugs, with the necessary pcm swap and all, before the turbo kit gets installed. I'll dyno it after the trans swap if I do. (it made 206whp at 5400 with no less than 200whp form 5200-6000 bone-stock with 148K miles!)
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Old 02-07-2006, 06:16 PM   #13
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Quote:
Originally Posted by 1993 SLE
Jeff....consider that the H body core support WILL NOT handle a dogbone mount or mounts....
Nor will the 92-98 GA, but that didn't stop me either... (my first L67 swap back in 2002-2003)

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I spread the load across the width of the core support to the vertical header uprights with a 1/8" steel plate. These pictures were of the first design... I went back and revised it a little (not that the first wasn't strong enough, just looked a little rogue-ish)
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Old 02-07-2006, 06:20 PM   #14
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Quote:
Originally Posted by 95naSTA
Quote:
Originally Posted by pontiacjeff
Quote:
Originally Posted by 95naSTA
Holy crap.
Is that d/* cover even going to fit in the engine bay? Or are you going to have to shift the engine over to the p/* side?
The rear of the side cover is the exact distance that the W-body trans mount is from the bellhousing face. I might make a frame stand off and use a side mount like the w-body or just keep the front/rear mounting config like the H-body uses. I'd almost rather use the W- with it'* upper dogbone config.

One other thing... the -80 centerline is ~.375" wider than the -60/-65 (9.500" vs. 9.125") so the axles will have a slight rearward slant... not nearly enough to even give a second thought about.
So if you decide to keep the bonneville torque-axis mount on the p/*.. Will the tranny clear the other side of the engine bay?
I'm going to buy a spare k-member later this week for fitment. I will know more about the mounts then.
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Old 02-07-2006, 06:37 PM   #15
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Quote:
Originally Posted by Hans


curious to know how much better the 4t80'* hold up vs a modded 4t65e w/LSD
Alot! Evrything inside is MUCH bigger and stronger than the -65. Take a look at the differentials!

The -80 diff is on the right (-65 non-HD shown, -HD only slightly larger):



Look at the difference b/t the -80 planetary gears and the -65 planetary gears!!!!



Ya, it'* MUCH stronger! The -80 planet PIN is almost as big as the -65 planet GEAR!! LOL!!!!!!!!!!!!!!!!!!
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Old 02-07-2006, 06:40 PM   #16
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Going home now... more info later tonight.
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Old 02-07-2006, 06:44 PM   #17
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Interesting project although I think a well built hardened 4t65E-HD transaxle would be smaller, lighter, and do the job just as well (if not better).

Good luck with this though, I look forward to seeing your progress
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Old 02-07-2006, 07:04 PM   #18
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cool.

what other mods are in store for the motor? It seems you have the PCM taken care of...doing pulley/rockers/cam?
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Old 02-07-2006, 11:16 PM   #19
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Quote:
Originally Posted by Hans
cool.

what other mods are in store for the motor? It seems you have the PCM taken care of...doing pulley/rockers/cam?
I will pulley the */c for 10psi, ported outlet, ported LIM, 2" custom I/C (more on that in another topic), T4/62-1 custom turbo kit, 50# injectors, stock cam, rockers, Cometic head gaskets, ARP rod bolts and main studs. I'll start another topic when I start the engine build later this month.
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Old 02-07-2006, 11:22 PM   #20
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Quote:
Originally Posted by pontiacjeff
Quote:
Originally Posted by Hans
cool.

what other mods are in store for the motor? It seems you have the PCM taken care of...doing pulley/rockers/cam?
I will pulley the */c for 10psi, ported outlet, ported LIM, 2" custom I/C (more on that in another topic), T4/62-1 custom turbo kit, 50# injectors, stock cam, rockers, Cometic head gaskets, ARP rod bolts and main studs. I'll start another topic when I start the engine build later this month.
IMHO 60lb injectors would be better. The 50'* are notorious for not flowing what they are rated or flowing way differently then each other. At the very least get them flowmatched. The Siemens 60s are way better and we have even pushed them to about 80-90 on our Turbo Car.
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