Reduce nose dive under heavy braking

redline10000 · 06-29-2015, 03:40 PM

Quote:

Originally Posted by POS VETT

You will need double-adjustable dampers with individual adjustment. Increasing compression damping reduces brake dive to a point. While brake dive is one thing, there is a possibility that the rear brake pads are a bit too aggressive initial bite creating a slight instability during heavy braking.

Also, some suspension designs incorporate an anti-dive geometry. Has the car been lowered by a substantial amount?

The car is 27 inches from the ground in the front and 27 and 3/16th in the rear. I don't think its the brake pads since its was squirrely when I had stock pads. The car is much more improved this year with SA colivers and the drop vs stock but I still feel like there's more stability to be had under hard braking.

Could some of the instability under braking be caused by toe loss when the rear end is unloaded?

POS VETT · 06-29-2015, 04:09 PM

Quote:

Originally Posted by redline10000

The car is 27 inches from the ground in the front and 27 and 3/16th in the rear. I don't think its the brake pads since its was squirrely when I had stock pads. The car is much more improved this year with SA colivers and the drop vs stock but I still feel like there's more stability to be had under hard braking.

Could some of the instability under braking be caused by toe loss when the rear end is unloaded?

I'm unsure about those ride height numbers since I don't have a point of reference.

Rear toe out gain is also a possibility. If there is a considerable amount of rear-steering is built into the suspension design, rear would toe out during a hard braking. However, this is only at an autox; can you adjust your driving style to take advantage of it? I don't race my 370Z, but many years ago when I autoxed my '95 Eagle Talon TSi AWD, I gained a habit of trail braking because the car would rotate under hard-braking.

One other thing, if the instability was indeed due to the rear wheel steering, see if more toe in in the rear could be dialed in.

redline10000 · 06-29-2015, 04:25 PM

Quote:

Originally Posted by POS VETT

I'm unsure about those ride height numbers since I don't have a point of reference.

Rear toe out gain is also a possibility. If there is a considerable amount of rear-steering is built into the suspension design, rear would toe out during a hard braking. However, this is only at an autox; can you adjust your driving style to take advantage of it? I don't race my 370Z, but many years ago when I autoxed my '95 Eagle Talon TSi AWD, I gained a habit of trail braking because the car would rotate under hard-braking.

One other thing, if the instability was indeed due to the rear wheel steering, see if more toe in in the rear could be dialed in.

stock height is 27.89 and 27.99 so my drop is very mild. If toe is my problem I can definitely go and get some more dialed in. At the moment I only have about 1/8th toe in with me in the car. I can try trail braking if that is what it will take to keep the rear end from wagging around.

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