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Re: ZF 8-speed swaps. Next big thing?
[Re: Uberpube]
#3139947
04/22/23 11:40 AM
04/22/23 11:40 AM
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Joined: Jan 2003
Posts: 8,171 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,171
Plymouth, MI
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The strategy on the newer transmissions is to dump timing for fraction of second between shifts to help the transmission live at high power levels That's done primarily for shift feel. The newer transmissions have so much rotational inertia in them, if you don't manage torque during shifts it feels very odd- you get pushes through the driveline that are unnerving, it feels like extra acceleration through the gear, which also can upset the car. Pulling timing settles it out.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: ZF 8-speed swaps. Next big thing?
[Re: moparx]
#3140106
04/23/23 07:53 AM
04/23/23 07:53 AM
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Joined: Jan 2021
Posts: 999 rust belt
Moparite
super stock
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super stock
Joined: Jan 2021
Posts: 999
rust belt
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Your answer is in this thread, "It was close to the tunnel"
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Re: ZF 8-speed swaps. Next big thing?
[Re: Blusmbl]
#3140262
04/23/23 11:11 PM
04/23/23 11:11 PM
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Joined: Nov 2013
Posts: 712 Southern Alberta
Uberpube
super stock
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super stock
Joined: Nov 2013
Posts: 712
Southern Alberta
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The strategy on the newer transmissions is to dump timing for fraction of second between shifts to help the transmission live at high power levels That's done primarily for shift feel. The newer transmissions have so much rotational inertia in them, if you don't manage torque during shifts it feels very odd- you get pushes through the driveline that are unnerving, it feels like extra acceleration through the gear, which also can upset the car. Pulling timing settles it out. In the tuning discussions on the Euro pages, I was reading the opposite, they are lightweight internally which adds to their efficiency. They use torque management on the upshift to manage slip in between shifts, and they need throttle blip on the downshifts to save the clutches. Apparently the HTG GPU can do just about all that's needed to run that transmission.
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Re: ZF 8-speed swaps. Next big thing?
[Re: Uberpube]
#3140294
04/24/23 07:49 AM
04/24/23 07:49 AM
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Joined: Jan 2003
Posts: 8,171 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,171
Plymouth, MI
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It's a tradeoff of how quickly you can apply the clutches vs. shift feel. You can get it to live without the torque management but it won't feel good at all.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: ZF 8-speed swaps. Next big thing?
[Re: HDNMOPERS]
#3217420
03/02/24 11:42 AM
03/02/24 11:42 AM
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Joined: Feb 2021
Posts: 157 PINE VALLEY
Ray S
member
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member
Joined: Feb 2021
Posts: 157
PINE VALLEY
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JVX adapter and 2015 RAM 8HP70 behind a 1971 413-1 "industrial"/RV engine. Trans re-flash still needed to match the EcoDeisel power curve, which is almost identical. Challenger shifter with fabbed adapter plate for the RV dash.
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Re: ZF 8-speed swaps. Next big thing?
[Re: Ray S]
#3217453
03/02/24 01:36 PM
03/02/24 01:36 PM
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Joined: Feb 2007
Posts: 5,470 Michigan
oldjonny
Don't argue with me.
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Don't argue with me.
Joined: Feb 2007
Posts: 5,470
Michigan
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Is that spray foam everywhere underneath?
Never, ever argue with an IDIOT. They will drag you to their level and then beat you with their years of experience
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Re: ZF 8-speed swaps. Next big thing?
[Re: oldjonny]
#3217469
03/02/24 01:52 PM
03/02/24 01:52 PM
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Joined: Feb 2021
Posts: 157 PINE VALLEY
Ray S
member
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member
Joined: Feb 2021
Posts: 157
PINE VALLEY
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Is that spray foam everywhere underneath? Ya, 4" or so. I added foil over the trans in case of high heat. First owners bought it in CO and lived in MT
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