Wheels bouncing/skipping on take-off?

EazyD · 01-22-2012, 12:10 PM

Why do my wheels skip when I take off? I have the sport package with the VLSD. Stock suspension. 19" potenzas.

If it's any of those things, can you explain why? (Explain like I'm 5 years old)

Evidence @ the 2-minute mark here:

Thanks!

m4a1mustang · 01-22-2012, 12:23 PM

That's wheel hop, which is due largely to flex in the rear suspension. To quell NVH soft bushings are used which are great for keeping noises and vibrations out of the cabin, however they are pliable and cause some flex. This will cause components to load and unload quickly which leads to the tire gripping then losing traction and then gripping again.

Tire compound and temperature can also play a role.

Sent via Tapatalk

EazyD · 01-22-2012, 12:48 PM

Quote:

Originally Posted by m4a1mustang

That's wheel hop, which is due largely to flex in the rear suspension. To quell NVH soft bushings are used which are great for keeping noises and vibrations out of the cabin, however they are pliable and cause some flex. This will cause components to load and unload quickly which leads to the tire gripping then losing traction and then gripping again.

Tire compound and temperature can also play a role.

Sent via Tapatalk

Thanks. Is there anything I can do to prevent this without changing suspension? (different clutch technique, etc.)

m4a1mustang · 01-22-2012, 12:53 PM

Quote:

Originally Posted by EazyD

Thanks. Is there anything I can do to prevent this without changing suspension? (different clutch technique, etc.)

A softer launch can help. If you are dumping the clutch that can induce wheel hop. Try to slip it and minimize wheel spin.

Warmer temps and/or stickier tires can also help.

wdkwang · 05-22-2012, 08:32 PM

eazyd, how'd you make that nice intro screen and sound

2004YZFR1 · 05-22-2012, 09:18 PM

That looks like a fun day of auto X.

nick3237 · 05-22-2012, 10:37 PM

where is this in mass?

new370 · 05-22-2012, 10:42 PM

I changed my trans mount and a world of difference, probably one of the best mods I did (I did motor mounts too but I doubt that's helping wheel hop)

Sh0velMan · 05-23-2012, 08:17 AM

Quote:

Originally Posted by new370

I changed my trans mount and a world of difference, probably one of the best mods I did (I did motor mounts too but I doubt that's helping wheel hop)

What did you change them to?

wdkwang · 05-28-2012, 02:24 PM

The only time I was able to dump the clutch on a 4-5k launch and just peel out was while it was a hot summer day after a high speed run. I was so surprised it just peeled out instead of just hopping all over the place

new370 · 05-28-2012, 02:42 PM

I went with drop engineering solid mount it's polymer urethane mixture but they are solid mounts it definitely made it a noisyer ride especially at idle but my take off is incredible there is no lag and no hop

01-22-2012, 12:10 PM	#1 (permalink)
EazyD A True Z Fanatic Join Date: Nov 2009 Location: Massachusetts, USA Posts: 1,211 Drives: 2010 6MT Sport pkg. Rep Power: 26	Wheels bouncing/skipping on take-off? Why do my wheels skip when I take off? I have the sport package with the VLSD. Stock suspension. 19" potenzas. If it's any of those things, can you explain why? (Explain like I'm 5 years old) Evidence @ the 2-minute mark here: Thanks! __________________ Pearl White 2010 370Z Sport, Stillen CBE, tint, K&N drop-in filters, GT-R start button, Kenwood DNX-6980 with backup cam, LED bulbs, Raceseng shift knob.

01-22-2012, 12:23 PM	#2 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	That's wheel hop, which is due largely to flex in the rear suspension. To quell NVH soft bushings are used which are great for keeping noises and vibrations out of the cabin, however they are pliable and cause some flex. This will cause components to load and unload quickly which leads to the tire gripping then losing traction and then gripping again. Tire compound and temperature can also play a role. Sent via Tapatalk __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

05-22-2012, 08:32 PM	#5 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 21	eazyd, how'd you make that nice intro screen and sound __________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

05-22-2012, 09:18 PM	#6 (permalink)
2004YZFR1 Enthusiast Member Join Date: Apr 2010 Location: Las Vegas Nevada Posts: 308 Drives: 09 370Z yellow,auto Rep Power: 15	That looks like a fun day of auto X. __________________ K & N Filters \| HPS silicone air intakes\| Fast Intentions CBE with 18" resonators \|

05-22-2012, 10:42 PM	#8 (permalink)
new370 Base Member Join Date: Jul 2010 Location: phila pa Posts: 109 Drives: 09 370z Rep Power: 15	I changed my trans mount and a world of difference, probably one of the best mods I did (I did motor mounts too but I doubt that's helping wheel hop) __________________ 2009 370z - custom two-tone paint - 20 x 8.5, 20 x 10" Rennen wheels - FI CBE - HKS RS intake

05-22-2012, 10:37 PM	#7 (permalink)
nick3237 Base Member Join Date: Apr 2012 Location: Boston, MA Posts: 59 Drives: 09 370Z Rep Power: 13	where is this in mass?

05-28-2012, 02:24 PM	#10 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 21	The only time I was able to dump the clutch on a 4-5k launch and just peel out was while it was a hot summer day after a high speed run. I was so surprised it just peeled out instead of just hopping all over the place __________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

05-28-2012, 02:42 PM	#11 (permalink)
new370 Base Member Join Date: Jul 2010 Location: phila pa Posts: 109 Drives: 09 370z Rep Power: 15	I went with drop engineering solid mount it's polymer urethane mixture but they are solid mounts it definitely made it a noisyer ride especially at idle but my take off is incredible there is no lag and no hop __________________ 2009 370z - custom two-tone paint - 20 x 8.5, 20 x 10" Rennen wheels - FI CBE - HKS RS intake

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