Frame Stiffing to reduce Porpoising?
Got a question for you seasoned drivers with older rigs. I have a 1999 F350 Dually Quad Cab Long Bed. I've been driving it for thousands of miles and for the most part, it's been fine. However, while ...
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A crew cab truck has a long frame, and it is going to be more flexible. I've had a 1999 Supercab, followed by the current 2015 Supercab which is identical in almost all respects except the powertrain. One thing I found on both of them was the porpoising was greatly reduced by increasing the shock resistance on the front. Even though the front carries very little of the weight of the camper. With the camper onboard, when cyclical pitching starts it contains a lot more energy, not so much from the longitudinal position of the CG, but the vertical position.
I had (have) Rancho 9000 shocks, when I loaded the camper I'd leave the front ones on 4 or 5 and dial the back ones up to 9. I found that putting the front ones up to 8 significantly helped the porpoising. If it is caused (or aggravated) by suspension movement, then the shocks are the only way that movement is dampened.
I had (have) Rancho 9000 shocks, when I loaded the camper I'd leave the front ones on 4 or 5 and dial the back ones up to 9. I found that putting the front ones up to 8 significantly helped the porpoising. If it is caused (or aggravated) by suspension movement, then the shocks are the only way that movement is dampened.
