LS1 Guys: Best, Recent Transaxle Options? |
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LS1 Guys: Best, Recent Transaxle Options? |
The Double S |
Sep 13 2020, 09:09 AM
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#1
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Member Group: Members Posts: 93 Joined: 8-October 19 From: Upland, CA Member No.: 23,545 Region Association: Southern California |
A lot of older threads on the topic of marrying transaxles to V8s. I just finished rebuilding an LS1 and am looking to weigh current and cost effective options on the trans. G50s are out of my league but Boxter and Subaru variants sound efficient and reliable. Currently running a SBC 350 and 901 side shift.
For those of you who have had the experience of building them, or are building them now, what are your opinions, preferences, or realizations? Planning for a street/track set up. Thank you for the help in advance. |
tygaboy |
Sep 13 2020, 02:55 PM
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#2
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914 Guru Group: Members Posts: 5,269 Joined: 6-October 15 From: Petaluma, CA Member No.: 19,241 Region Association: Northern California |
To your point, it's about budget. I have an LS3 and I didn't want to worry about things breaking so I went with a Boxster S 6-speed (G86-20) as they've been proven to about 500 hp.
They can be found on ebay in the $2k range. You can get a stock shifter and cables for a couple hundred, last I looked. Kennedy Engineering makes the adapter plate, flywheel and clutch. Or you can get the whole kit, including trans mounts from Renegade, but it's not cheap. Best of luck with your decision. |
horizontally-opposed |
Sep 13 2020, 03:19 PM
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#3
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Advanced Member Group: Members Posts: 3,430 Joined: 12-May 04 From: San Francisco Member No.: 2,058 Region Association: None |
To your point, it's about budget. I have an LS3 and I didn't want to worry about things breaking so I went with a Boxster S 6-speed (G86-20) as they've been proven to about 500 hp. They can be found on ebay in the $2k range. You can get a stock shifter and cables for a couple hundred, last I looked. Kennedy Engineering makes the adapter plate, flywheel and clutch. Or you can get the whole kit, including trans mounts from Renegade, but it's not cheap. Best of luck with your decision. Chris, is the proven to about 500 hp with V8s or flat sixes or? Curious as the later 981 GT4 6MT signed off on by Motorsport was limited to 310 lb-ft, which arrives at 4700+ rpm in that car. The gearing is pretty bad in a 981, too, with 2nd stretching to 84 mph and 3rd to 112 mph—so not too fun on a back road. I've started to wonder about taking a 7MT from a 991 and flipping the ring gear as people do with 915 gearboxes, as the torque limit is higher. Next question is whether there's a way to delete 7th gear or lock it out like Porsche does on the GT4 Clubsport PDK, or just enjoy 9,000,000 miles per gallon. |
tygaboy |
Sep 13 2020, 05:01 PM
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#4
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914 Guru Group: Members Posts: 5,269 Joined: 6-October 15 From: Petaluma, CA Member No.: 19,241 Region Association: Northern California |
To your point, it's about budget. I have an LS3 and I didn't want to worry about things breaking so I went with a Boxster S 6-speed (G86-20) as they've been proven to about 500 hp. They can be found on ebay in the $2k range. You can get a stock shifter and cables for a couple hundred, last I looked. Kennedy Engineering makes the adapter plate, flywheel and clutch. Or you can get the whole kit, including trans mounts from Renegade, but it's not cheap. Best of luck with your decision. Chris, is the proven to about 500 hp with V8s or flat sixes or? Curious as the later 981 GT4 6MT signed off on by Motorsport was limited to 310 lb-ft, which arrives at 4700+ rpm in that car. The gearing is pretty bad in a 981, too, with 2nd stretching to 84 mph and 3rd to 112 mph—so not too fun on a back road. I've started to wonder about taking a 7MT from a 991 and flipping the ring gear as people do with 915 gearboxes, as the torque limit is higher. Next question is whether there's a way to delete 7th gear or lock it out like Porsche does on the GT4 Clubsport PDK, or just enjoy 9,000,000 miles per gallon. Pete - I was only concerned about what to use with my V8. The LS3 in my car came out of Tony's (Cracker) 914 (also running a G86-20, though he does have an LSD) and was replaced with an LS7 that dyno'd at something like 530hp at the wheels. He tracks his car so regularly sees WOT and his trans is taking virtually all that power. To date, he hasn't had any gearbox issues. I think if you don't abuse it, it'll last, especially on the street. For fun, here's Tony on track with the LS3 before I got it. http://www.914world.com/bbs2/index.php?showtopic=271085 |
horizontally-opposed |
Sep 13 2020, 06:47 PM
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#5
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Advanced Member Group: Members Posts: 3,430 Joined: 12-May 04 From: San Francisco Member No.: 2,058 Region Association: None |
Pete - I was only concerned about what to use with my V8. The LS3 in my car came out of Tony's (Cracker) 914 (also running a G86-20, though he does have an LSD) and was replaced with an LS7 that dyno'd at something like 530hp at the wheels. He tracks his car so regularly sees WOT and his trans is taking virtually all that power. To date, he hasn't had any gearbox issues. I think if you don't abuse it, it'll last, especially on the street. For fun, here's Tony on track with the LS3 before I got it. http://www.914world.com/bbs2/index.php?showtopic=271085 Tony's car is incredible, and I remember watching one of his Road Atlanta videos in a kind of awe. Looks like he's clean and smooth, FAST with mechanical symphathy. Perhaps Porsche's point about the GT4 6MT being at its torque limit already with the 2016 model has to do with their torture tests—which may be their way of anticipating certain…customers. Down that road, I was in a Porsche shop years ago and a guy came walking in saying I owed him a transmission for his 993. Why, I asked? Because, apparently, I had said that his 993 had a strong transmission. He went on to say he had killed his transmission after some hard starts (5000 rpm and dumping the clutch). "Ah," I said. "I meant that transmission can probably withstand 24 hours of racing at a place like Daytona..." as I scratched my head and considered the fact that he had just gotten out of a Ford Lightning pickup. "Strength," and "limit," can mean different things...and sounds like you'll be just fine. |
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