Wheel hop

[iamspartacas]

I have an 06 G35 sedan 6MT w/stillen exhaust, nismo cold air intake, and stillen supercharger. I have not put it on a dyno but I think I'm pushing over 400hp. I have a problem with a little bit of wheel hop on the hole shot so I was wondering what would be the best thing for the rear end because I don't want to brake anything. Any advice would be appreciated. I will post pics and dyno results soon. Also I'm in Chalotte, NC if your from around there give me a holler.

Mark

[joe603]

Welcome to NICO!

If you have a roots type blower, then your adding 50-60% more torque and that puts a strain on the rear end. Wheel hop is usually caused by motor mounts. Get a set of solid mounts and you will reduce it. Also sticky tires will help.

What stage kit are you running? The stage 4 kit is the only one capable of making over 400RWHP.

[rn79870]

Welcome to the forum. I'm going to go out on a limb here and guess it might be related to axel windup. I'm not sure if the Infiniti suffer from that but I've experienced it with other cars. The cure is usually another pair shock mounted almost parallel to the ground to control the wind up. (or ladder bars) Maybe C_Kwik will stop by and offer some insight on the cause and your solution. Yo C_Kwik...

[gwoods]

Stickier tires would actually make the wheel hop worse.

The G35 has an independant rear suspension so the easier tricks like traction/ladder bars don't wore cause there is nothing for them to bolt too and prevent from wrapping. Those 2 fixes only worn on leaf spring solid axle cars/trucks.

The best bet for controlling wheel hop is something called a pan-hard rod. It connects the center of the axle (the differential) to the body of the car with a shock absorber. It still allows the axle to warp up and move up toward the bottom of the car but it slows the up motion and the down motion so instead of repeated hopping you will get one jump and be moving.

Once you install a pan hard rod you WILL break at least one of your half shafts in the first months worth of racing.

Start looking for a company that will either A) make you custom half shafts or B) Strengthen the current half shafts. Cryo treating is one method.

The modified SRT-8 LX body hemi cars have the same problem. This is my buddies half shaft that broke at the track with street tires. He now has 1000 hp half shafts that were custom made. I'll email him and find out the name of the company that made his maybe they want to branch out to the G?

Sidebar I would love to see video's and pictures of you car! What is your fastest ET? This is the reason I don't modify my G it would be so easy for me to be in your position

Good luck!

Jeff

[gwoods]

http://mustangdepot.com/OnLine...r.htmh ... su....aspx

Sorry for the Mustang p0rn. But this might work on the G. I would find a suspension shop that is recommended by someone you trust to install this. Its a weld on and if its done wrong your car will handle unpredictably in corners.

[joe603]

Really...??I've read that sticky tires with low air pressure would help with hop.

[C-Kwik]

Wheel hop can occur in any number of places that allow deflection of suspension components. I am not sure about the G's and Z's, but earlier Nissan cars had penty of hop that was attributed to the subframe bushings flexing under load. I wouldn't be surprised if this was an issue with the newer Nissan RWD platforms, but I wouldn't limit it to that. The suspension itself can contribute to it. Also consider that a heavy wheel/tire combo may also contribute. Here's a great video that shows some serious subframe movement during a launch. Fast forward to about the 1:30 mark to see just the wheelhop.

http://www.pickuptruck.com/htm....html

The motor mounts are not likely a cause of any wheelhop in a FR drivetrain configuration. FWD cars exhibit this problem as the output of torque fronm the engine is parallel and in direct connection with the rotation of the wheels. In a FR configuration, the torque output from the motor is perpendicular to the wheel rotation so it is well isolated from being much of a source of wheelhop.Sure, the engine can rock in the mounts, but it's unlikely the front to back rocking of the rear suspension will cause a side to side rocking of the engine and transmission.

[goneracin]

The part you are describing is a torque arm from the mustang world. A panhard bar attaches to your frame behind the rear axle and attaches on the passenger side of the axle as well. Most IRS mustang people upgrade their bushings and springs in their rear to stiffen it up and cut down on wheel hop.

[joe603]

Yup, you're right! I was thinking FWD for the mounts...

Gotta be suspension then.

[iamspartacas]

Thanks for the info. I just got back from Iraq so I'm just starting out with the mods and stuff but will post pics and results soon.

[gwoods]

Really...??I've read that sticky tires with low air pressure would help with hop.

That would give you more traction and more hop at least it did on my Ram. I eventually did home made traction bars (leaf spring rear end) and clamped the front leafs together to limit their flex. I went through bearing kits before I got it fixed. As a result I can rebuild a 9.25 Chrysler rear end in about 2 hours

[oldandslow]

Stiffer springs and adjustable shocks should fix Your wheelhop.It sounds too simple, but it works.Back when I had my 03 mustang cobra,which had an independant rearsuspension and 407 rear wheel horses,I was fighting horrible wheelhop.The big mustang suspension guys tried stiffer rear bushings,and braces.That didnt work well, and made the car ride terrible.Defeated the whole purpose of having indepentant rear.Somebody came up with the idea to try adjustable shocks ,which allow You to tune Your suspension.The idea here is to allow weight transfer to the rear wheels.In My case,I would set the rear shocks to a very soft setting,allowing them to compress easilly,which caused the rear end to squat down.It would grab traction and I would control it and wheelspin with throttle.The adjustable shocks let You have the best of both worlds.You can stiffen them up when You want good handling.Since Im new here, and dont even have a G yet, Im not sure what adjustable shocks are out there for these cars,but if somebody like Koni makes a shock with ajustment for both compression and rebound,that would be the best.You could adjust the front to come up easy,and the rear to come down.

Back when I was a kid in the 60's, they made 90/10 shocks for drag racing.They would take only 10% effort up, and 90% effort down.They would let the front end come up easy to get the weight transfer going.If You couldntafford them, You would drill holes in old shocks,and drain the oil out.That made for a fun drive to the dragstripJeff F

[rn79870]

oldandslow, if it wasn't for us Mustang guys, (and C-Kwik), what would all these guys/gals do?

[rn79870]

Thanks for the info. I just got back from Iraq so I'm just starting out with the mods and stuff but will post pics and results soon.

Be careful with your car. I just saw a thread here where the cops in NC confiscated a few performance cars that were street racing, and they are now using them as bait for enforcement purposes. (I know you wouldn't do that anyway.)

[oldandslow]

I hate to admit it rn79870,but arizonaG35 may be right about trying to make up for my shortcomings.Back in 03,when I bought that cobra,I was the king of the road around here.I instantly was 20 years younger,had more hair,and turned air into viagraJeff F

[rn79870]

I hate to admit it rn79870,but arizonaG35 may be right ...

AXG35 Right? You know what they say about a blind squirrel finding a nut every so often, right?

...Back in 03,when I bought that cobra,I was the king of the road around here.I instantly was 20 years younger,had more hair,and turned air into viagraJeff F

That's not necessarily a bad thing. The G is a great car, but it can't compare to the sound of a Ford V8 with dual chamber flo-masters. Not even close. That sound would give the Pope a .....

[Rivalry]

Thanks for the info. I just got back from Iraq so I'm just starting out with the mods and stuff but will post pics and results soon.

Welcome back, sir. Always support my fellow members overseas.