wheel hop

[400ex]

takeing off i get alot of wheel hop. what can i do to stop it, besides letting off. 2003 G35 coupe

[C-Kwik]

I assume you are spinning the tires at this point? Generally wheel hop is caused by flexing in the suspension. In most RWD imports, it's the subframe and suspension bushings that flex and cause the wheelhop as you try to burn rubber. Typically, this is not the fastest way to get off the line anyways, so I tend not to do it, but if you must, you can swap out the bushings for stiffer ones. Though, this will increase NVH, it may solve your problem and give you a bit more responsiveness.

[Q45tech]

How many miles, people don't realize shocks progressively age [nitrogen leaks out---seals wear] to near worthless by 60,000 miles.

[maxnix]

Q45tech is correct in that the problem is an interaction with suspension geometry and various harmoic resonances in the suspension including (but not limited to) spring rate, suspension component flex including deformation of parts and bearing mounts, spring rates, tire inflation pressures, coeffcicient of friction between tires and road surface, torque loading, shock dampening rates, etc.

[400ex]

i just hit 13,000 on it.

[Q45tech]

I should have added a time frame to the shock wear out mileage, once the shock gets cycled on the suspension, it takes about 4 years for the nitrogen pressure to leak out...........regardless of mileage.

Really the only simple way to tell is to demount the shocks, compress them and stopwatch the self expansion rate in seconds compared to a new one.

Takes about 5 seconds at room temperature............9-11 seconds at 32F.

There is a method to the 12,000 mile replacement parts warranty.In the beginning Infiniti included shock testing specs on 90-93 Q models.That went away when people like me presented results from lab shock testing machines and got 2 sets replaced free underwarranty.

Historically the rear shocks wear out at almost double the front rate.

Rear hopping is almost always from poor rebound control with mulilink rear suspension. Solid rear suspensions are a different problem.

The multilink types always do worse in a starting drag race.

[400ex]

thanx.. i'll pull them out and try them in room temp. and see what i get

[Jamaica2G]

It has

How many miles, people don't realize shocks progressively age [nitrogen leaks out---seals wear] to near worthless by 60,000 miles.

I've had that problem since... lol whenever I started driving it hard at 3000 miles! 3 months after I got it.

It has been a bit better lately though because I have learned to adjust my launch RPM just under the point of "hoppage". hehehe is that a word?

I just changed the sways on the car for stillens. I dont know if that will make a difference. I'll try it out when I get home.

Adrian

[Q45tech]

People don't realize that sway bars act as stiff springs [to reduce body roll] and stiffer sway bars just require MORE shock control.

Designers skip this because the sway bars only work when the side to side weight is assymetrical or in turning.

Remember to adjust the sway bar preload to match how you drive the car not just sitting empty............same with alignments driver weight must be sitting in driver seat or things will be off rolling down the road.

Drag racing launch requires much different configuration from road course handing thus wheel hop.

Adjustable rear shocks so you can double rebound control!