Rear Suspensions

[juan ruiz]

I'd like to get some opinions on how completely eliminate the rear wheel hop that we are suffering whether it's on the race track or the street. On second gear and up the wheel hop is real bad. I have adjustable coil overs but none of the settings seems to really provide an effective solution.

Now the trick will be to address this department without breaking the bank , I have a few ideas but some of you have extensive suspension knowledge so I'm all ears

[Turboo934]

What size rear tires are you running and how much HPs are you putting to the ground?

[Les Paul]

Do you have rear adjustable spring plates?

[juan ruiz]

Tires are

Wheels/Tires: 17" Speed lines
7 ½ Front 205-50-17
9 ½ Back 255-40-17
Michelin Pilots
Racing BF. D.O.T. Drag Radials 275-40-17

675 RWHP

No adjustable spring plates

[Turboo934]

With that much HP, short of building up a 935 type rear suspension , wider wheels & tires.

[Black_Hat]

I have had a few drag bugs
Type 1 VW some turbo 10 second cars
there is nothing more fun than spanking a mustang in a Bug

wheel hop is an issue 2 - 300 more hp than stock in a bug
Some things i did to cure my hop issue
1 rear shocks and 60/40 front shocks
2 tie the frame horns into the roll cage
3 suspension limiting straps on rear
4 solid trans/ engine mounts
5 right tires

You could try shoptalkforums dot com
lots of guys with a lot of experience

[juan ruiz]

Originally Posted by Black_Hat

I have had a few drag bugs
Type 1 VW some turbo 10 second cars
there is nothing more fun than spanking a mustang in a Bug

wheel hop is an issue 2 - 300 more hp than stock in a bug
Some things i did to cure my hop issue
1 rear shocks and 60/40 front shocks
2 tie the frame horns into the roll cage
3 suspension limiting straps on rear
4 solid trans/ engine mounts
5 right tires

You could try shoptalkforums dot com
lots of guys with a lot of experience

Thank you, NOW we are talking, we need people like you in our camp to make this happen, so anything you like to share please go for!! the VW is very close to what we all have

[911st]

What are your bushings, springs, shocks, and sways?

What is the orientation of the rear spring plates to the ground (downward, flat, up sloping to the hub)?

What tires are your running?

[911st]

Sorry, you state the tires.

[juan ruiz]

Originally Posted by 911st

What are your bushings, springs, shocks, and sways?

What is the orientation of the rear spring plates to the ground (downward, flat, up sloping to the hub)?

What tires are your running?

I will gather that Info and will report back

[Black_Hat]

The 60-40 shocks in front allow weight transfer, as the front comes up weight is shifted to the rear… the shocks are stiffer on the return stroke (slow return)

The limiting straps help on the return after the car has launched the rear wants to come back up the straps stop this .

Stiffer I mean stiff shocks and springs in rear stops squat

Rear end flex is (at least in VW’s) the primary cause of wheel hop, solid motor/trans mounts . tie everything into the roll cage to make one unit .

If you watch a car launch while the rear wheels are hopping you can see the engine hopping up and down ….You need to tie the motor down .

Again I have Zero experience with drag racing 911 turbo’s . I have a 965 turbo and I don’t do hard street launches .




here is a web page with some tech info on limiting straps

http://mufflermike.com/motortech.html scroll down for pics

more here http://mufflermike.com/

lots of other good info. Now this is a swing axle I dont know how much applies

this guy helped me out with some set up :

http://www.m-specmotorsports.com/

http://www.staggsracing.com/

and

Ron lummis racing

also try http://www.thesamba.com/vw/forum/

wheel hop will break things

[juan ruiz]

Thanks !! Interesting about the straps!