Diff jump. Hard take off?

NFB091 · 03-20-2016, 08:10 AM

Hey everyone. I've noticed every time I take off hard in 1st gear the rear end will start shattering/ jumping under wheel spin, guess if call it axle tramp.
Has anyone got this issue and resolved it with upgraded parts to help keep it steady I guess I'd call it axle tramp.! Thanks in advance

Jet Mech · 03-20-2016, 11:38 AM

Quote:

Originally Posted by NFB091

Hey everyone. I've noticed every time I take off hard in 1st gear the rear end will start shattering/ jumping under wheel spin, guess if call it axle tramp.
Has anyone got this issue and resolved it with upgraded parts to help keep it steady I guess I'd call it axle tramp.! Thanks in advance

Never had that happen. Maybe check your suspension bits and mounts.

nachob · 03-20-2016, 12:10 PM

Nope I have had two 1Ms now and that didn't happen to either. Just wheel spin, butt puckering and possible a little involuntary leakage from fear that something bad is going to happen. I also try to prevent wheel spin because it scares me in this car so I don't do it often but if you do, there might be something amiss. I do remember my first car with LSD was a front wheel drive Nissan Sentra SE-R. It was fine dry but in wet weather during wheel spin the diff would hunt for traction and it would feel like the font hopping but it was power bias shifting. This car has an independent rear suspension from the M3 and I have never heard them reporting that issue either. Have you checked your rear shocks? If they are soft you could have wheel hop.

E30 Racer · 03-20-2016, 12:41 PM

May also depend on the surface and tires.

Jet Mech · 03-20-2016, 03:48 PM

Quote:

Originally Posted by nachob

Just wheel spin, butt puckering and possible a little involuntary leakage from fear that something bad is going to happen.

I try not to spin in first or second...tires and cops are to expensive. But while accelerating up freeway ramps I like to hit third gear and nail the gas so I can see the blinky light.

NFB091 · 03-20-2016, 04:00 PM

Not sure why but my e46 M3 did same. But the 1m has about 300kw at wheels so it spins pretty easy might be issue, it's not bad feeling just feels like dash shaking .

bdaddylo · 03-21-2016, 03:18 PM

Quote:

Originally Posted by NFB091

Not sure why but my e46 M3 did same. But the 1m has about 300kw at wheels so it spins pretty easy might be issue, it's not bad feeling just feels like dash shaking .

The rear hop is due to the OEM rubber rear sub-frame bushings. You can replace them with stiffer or solid bushings, but it will created NVH issues.

NFB091 · 03-21-2016, 03:30 PM

NVH issues being? From what I see there's not really a way around it unless I get cup tyres or what not

craina · 03-21-2016, 04:00 PM

Quote:

Originally Posted by NFB091

NVH issues being? From what I see there's not really a way around it unless I get cup tyres or what not

Noise, vibration, harshness due to the stiffer compound (aftermarket poly/solid vs stock rubber).

GimmeanM · 03-21-2016, 04:00 PM

noise/vibration/harshness

bodega_bladerunner · 03-21-2016, 11:16 PM

Nvh aka feels/sounds more race car-ish

03-20-2016, 08:10 AM	#1
NFB091 Private First Class 5 Rep 128 Posts Drives: Bmw 1M VO Join Date: Jul 2014 Location: Sydney iTrader: (0)	Hey everyone. I've noticed every time I take off hard in 1st gear the rear end will start shattering/ jumping under wheel spin, guess if call it axle tramp. Has anyone got this issue and resolved it with upgraded parts to help keep it steady I guess I'd call it axle tramp.! Thanks in advance
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03-20-2016, 12:10 PM	#3
nachob Brigadier General 2314 Rep 4,341 Posts Drives: 2004 330i ZHP, 2022 Cayman T Join Date: Apr 2008 Location: California iTrader: (5)	Nope I have had two 1Ms now and that didn't happen to either. Just wheel spin, butt puckering and possible a little involuntary leakage from fear that something bad is going to happen. I also try to prevent wheel spin because it scares me in this car so I don't do it often but if you do, there might be something amiss. I do remember my first car with LSD was a front wheel drive Nissan Sentra SE-R. It was fine dry but in wet weather during wheel spin the diff would hunt for traction and it would feel like the font hopping but it was power bias shifting. This car has an independent rear suspension from the M3 and I have never heard them reporting that issue either. Have you checked your rear shocks? If they are soft you could have wheel hop.
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03-20-2016, 12:41 PM	#4
E30 Racer Captain 220 Rep 695 Posts Drives: '11 1M, '09 335i M Sport Join Date: Aug 2011 Location: Ohio iTrader: (2)	May also depend on the surface and tires.
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03-20-2016, 04:00 PM	#6
NFB091 Private First Class 5 Rep 128 Posts Drives: Bmw 1M VO Join Date: Jul 2014 Location: Sydney iTrader: (0)	Not sure why but my e46 M3 did same. But the 1m has about 300kw at wheels so it spins pretty easy might be issue, it's not bad feeling just feels like dash shaking .
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03-21-2016, 03:30 PM	#8
NFB091 Private First Class 5 Rep 128 Posts Drives: Bmw 1M VO Join Date: Jul 2014 Location: Sydney iTrader: (0)	NVH issues being? From what I see there's not really a way around it unless I get cup tyres or what not
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03-21-2016, 04:00 PM	#10
GimmeanM We've landed on the moon! 1449 Rep 906 Posts Drives: 2011 1M (AW) Join Date: Sep 2014 Location: Denver, CO iTrader: (0) Garage List 2020 BMW M2 CS [0.00] 2018 Toyota Tacoma [0.00] 2011 BMW 1M [10.00]	noise/vibration/harshness __________________
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03-21-2016, 11:16 PM	#11
bodega_bladerunner Lieutenant 156 Rep 434 Posts Drives: 2015 M4 Join Date: Dec 2015 Location: In the moutains iTrader: (1)	Nvh aka feels/sounds more race car-ish
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