Gen 4 ACR Stock Street alignment

[Norwegian]

When I got my 2009 ACR it was pretty much slammed, and since the roads here in Norway are anything but smooth, I adjusted the ride hight back to stock (according to the book), and did an alignment,
but I think my shop might have gotten it wrong.

What is the stock alignment figures for the car? Or what would you recommend for street use?

Thanks

John Thomas

[Aevus]

Hi John,


that topic might help:

https://driveviper.com/forums/threads/28891-Keeping-the-Snake-STRAIGHT


If I remember correctly that was gen 5 ACR's alignement specs:

Camber F -2.6 :: R -1.7 :: Caster F 6.6 :: Toe Total :: F -0,20deg :: R -0,34deg

But it's very track-oriented, I personnaly prefer something like that for the street:

Camber F -1.4 :: R -0.9 :: Caster F 8.8 :: Toe total :: F +0,05deg :: R -0,50deg

But I would highly recommend to use the TKO bump-steer correction kit before anything else, especially if Norway roads are rough.

[Aevus]

Long story short: reduce the camber a little to get as much caster as you can, put some negative toe (toe-in) on the rear wheels to keep the car straight and planted under acceleration and use minimal toe for the front wheels, along with bump-steer correction kit to keep the car aligned in all situations/road surfaces

[Aevus]

double post

[GTS Dean]

I know Aevus is a VERY strong proponent of large amounts of caster and pretty strong camber. If your car is mostly road driven, I would recommend a bit more moderate settings.

I don't know for certain what the OE recommendations are for settings, but I would suggest camber of -1.1 Front and -0.7 rear. Caster of +6.0 to +6.5 Front. If you push harder on twisty backroads, then add another -0.2 degrees camber and see how it feels.

Rear caster on a Viper cannot be measured on commercial alignment racks. Have the tech center both sets of rear cams in their ears at each corner with the reference holes straight up and measure camber. This should put caster reasonably close to OE. Then at each corner, roll both cam pairs in time with each other to set camber while maintaining caster unchanged. I strongly recommend that your tech does NOT adjust the cams with any weight on the tires. Have them lifted clear of the rack, and don't loosen the lock nuts any more than necessary to make the adjustments before re-tightening and measuring.

Set toe to OE and drive a bit. (I like more rear toe-in on my car.) It is always a good practice to cultivate excellent relationships with your alignment shop for fine-tuning your setup. Small camber and toe adjustments may be required to nail your optimal setup.

[Steve-Indy]

Norwegian, you have email.

[IndyRon]

I went with -1.0 deg camber front, -0.5deg camber rear, don't remember the toe in numbers but I think it was minimal on the rear. It's a good balance without too much tracking on uneven roads.

[GTS Dean]

You'll be fine with that. You should have minimal tire wear, unless you track it.

[SRT_BluByU]

Rear caster on a Viper cannot be measured on commercial alignment racks..

I believe it can if you have the correct bracket tools and inclinometer if its the same as a Gen V.

[GTS Dean]

Viper Service Tools are not available at "commercial" alignment shops.

[Aevus]

I know Aevus is a VERY strong proponent of large amounts of caster and pretty strong camber.

Strong camber, not at all. Lots of caster, yes.

Anyway, if you want a lot of caster you have to reduce the camber.

[SRT_BluByU]

Viper Service Tools are not available at "commercial" alignment shops.

yea.. you have to buy your own set. :)