Looking for some recommendations on alignment for my rally car... 96 GSR shell with 98 ITR stock suspension/drivetrain, except for DMS 50mm rally struts/springs.

Car turns in great, rotates well, and is very stable/predictable in the corners. I want to keep these characteristics as much as possible- however, at speeds over about 75mph, it's very scary. It railroad tracks wherever it feels like, randomly decides to pull you off the road, and is super unstable under braking. I'm debating whether this is due to toe or caster. I attached below my current alignment settings, and I'm looking for ideas of where to go next. I have a set of Skunk2 (camber) adjustable front UCA's that I'm considering flipping right to left in order to get some caster up front. Also thinking about more toe-in for the rears. Any thoughts/ideas/experience on dirt appreciated. This is a dedicated rally car, so it rarely sees tarmac (except on the transits).

 

Try toeing in the rears. All that toe out is definitely gonna make it unstable with rally tires.

 

Very cool car.

I don't have any experience rallying, but I do on road courses. What you're describing is transferable and is why we use an aftermarket wing. Also, with as much travel as you have, I would say what you're also experiencing is heeps of dynamic toe in front. I would look into spherical compliance bushings if not already and if the rules allow for it.

 

Saw this on a trailer coming back from Grand Junction to Denver. Very cool car!

 

I dont understand how you'd get your caster that low... I guarantee that's the biggest problem. The car is going to be darting all over the road like that. Swap the fronts like you said, that should put you closer to 1* positive. Loosen all the subframe bolts that mount it to the body (I think there are only 4?) and try and shift it as far forward as you can. I can usually get ~.5* from that on a Honda

Definitely zero the rear toe, but I don't think I'd go so far as to toe it in.

 

Thanks guys, I certainly appreciate all the feedback. I have about 3 weeks before the next race, so I'm going to try out these suggestions one at a time and log the results at the test track.

Land's End in Grand Junction was awesome, and there were several cool Integras I saw around there. The event will air on MAV TV in early November and we're sure to be on it (I stuffed it in a big ditch right infront of the camera crew). No damage other than weeds stuck in the roof vent, wipers and grille. Missed a shift/braking point on a 200 R6 ^cr -> L2 !!. Still won the Rally 2WD class.