Nose up...Nose Down...What???
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philsey
New member
Suggest you (use the Google option) Search "nose dive" - you should find enough posts to keep you busy for hours.
Front 5100's @ .85 will level the truck. And 4 of them will firm up the overall ride nicely. They will not "get rid" of the nose dive - they will reduce the nose dive, for many to an acceptable level, for me I still find it annoying. I am personally convinced that stiffer springs are the only true solution for an SR5.
A damned hunky, manly truck should not bob up and down like a Chevy Caprice with blown shocks.
philsey
New member
I didn't find this to be so on new P-rated tires, unless one must drive on 42 psi truck-rated tires to alleviate the nose bobbing.
Marlin 444
New member
I noticed if I don't try to drive my SR5 like a sportscar, then I rarely get the nose dive. Not saying everyone drives aggressively, but it is a SUV and not a corvette. I saw a H3 slow down for a red light the other day and you should have seen the front end dive on that thing.
I might eventually put on 5100's, but I really enjoy the stock ride.
I might eventually put on 5100's, but I really enjoy the stock ride.
Boaz
New member
Suggest you (use the Google option) Search "nose dive" - you should find enough posts to keep you busy for hours.
Front 5100's @ .85 will level the truck. And 4 of them will firm up the overall ride nicely. They will not "get rid" of the nose dive - they will reduce the nose dive, for many to an acceptable level, for me I still find it annoying. I am personally convinced that stiffer springs are the only true solution for an SR5.
A damned hunky, manly truck should not bob up and down like a Chevy Caprice with blown shocks.
I had 5100's on my tacoma and I really liked em. That might be a nice and somewhat economical solution...
I would hate to give up some smoothness on the highway ride though... so much nicer ride than my tundra.
Hunky.. yeah. I keep getting grocery getter comments from coworkers... probably because I went from a Tundra to a 4 Runner..I dunno. They can go buy a Tundra and put $80 a week in fuel in it. I don't miss that guzzler at all!
Boaz
New member
I have brand new stock sized P rated Revo 2's on all 4 corners. I might tweak the air pressure a bit...
1engineer
Moderator
Yes. I am running my Cooper Discoverer AT3's at 37 psi. They are "P" rated.
As 1engineer states, tires do help, a lot. But what do they help with? Well, as Philsey indicates, new tires in his case did not do much for nose dive. But I do not think the OP was referring just to nose dive. He stated "bobbing around", to me, that means "bouncy". (Notwithstanding the nose dive). I too felt that bobbing or floating type feeling with the OEM P rated tires. Every time I made a sharp turn, I really felt as though the tires were going to pop off the rim! They didn't, and I did try various PSI's, but after 1800 miles, just had to drop those OEM tires.
My concerns were completely eliminated when I got the tires listed in my sig block. It also reduced nose dive considerably. Not completely gone, I agree with Philsey, new springs and shocks or at least springs and tires, might make it totally go away, but frankly, just with the tires I got it is now very manageable so no need to spend the big bucks.
IMHO, "P" rated sidewalls from some manufacturers are so soft, that unless you really up the PSI, they will not perform (to the extent of my liking) and it is a personal opinion, compared to a stiffer side wall of an LT tire, be it C,D, or even E load.
My concerns were completely eliminated when I got the tires listed in my sig block. It also reduced nose dive considerably. Not completely gone, I agree with Philsey, new springs and shocks or at least springs and tires, might make it totally go away, but frankly, just with the tires I got it is now very manageable so no need to spend the big bucks.
IMHO, "P" rated sidewalls from some manufacturers are so soft, that unless you really up the PSI, they will not perform (to the extent of my liking) and it is a personal opinion, compared to a stiffer side wall of an LT tire, be it C,D, or even E load.
what? How does a tire prevent the suspension from "diving" ?
philsey
New member
OK. Well then, I'm gonna pump 'em up and see what happens. Thanks for your insight.
I should have ... lemmee look. Not much to see, really, the truck is level aka the stock rake is gone.
FYI, the 5100s are specific to the F & R and only the F are adjustable. As far as firming up the ride, they were perfect for me.
EDIT: Here ya go ...
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Antman
Elite Member
:redbrick: Here we go. You see, 1engineer always posts those purposefully short, concise replies for moments exactly like this...
limamike
New member
The nose of the truck dives as a result of the suspension and tires; the suspension doesn't dive. The suspension and tires simply compress as a result of the kinetic energy of the truck during braking. Stiffer tires and stiffer suspension = less nose dive. Physics, you know?
whodat
New member
Ditto. I took his advice (thanks again) and definately noticeable improvement on the things mentioned. Now, I haven't slammed on the brakes to test the nosedive, but I have braked hard and have noticed less of a dive.
1engineer
Moderator
Tires and suspension work together, especially if you have a tall sidewalled tire like a 265-285. The stiffer the sidewall and running a higher pressure (within reason) will change the dynamics of your suspension as a whole. Anyone who has aired down for the beach or trails and unwittingly drove on the road before airing up will know precisely what happens with suspension.
Pump them up within reason and limit of the tire. When I got my new tires I again went through testing what pressure would be best for my in my application. I went from 32 psi to 40 psi in this order: 32, 35, 37, 40. I feel safe running at 37 psi as it is well within limits of tire and even though we can have a large temperature delta from night to day (sometimes from the 50's at night to 90's during day) that temperature change will only increase or decrease tire pressures 3-4 psi accordingly. It helped a lot on handling and normal braking.
Just trying to help lol.
Very good explanation! Gotta respect those unbreakable laws. If some of you want to go a little deeper into gas compressibility look up the ideal gas laws or even deeper is Bernoulli's Hydrodynamica which is the basic theory behind kinematic behavior of gases.
Slamming on the brakes will still give you nosedive in just about any multi use vehicle. Hit the front brakes on a motorcycle sometime lol.
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JB.
New member
I'm having a hard time seeing how a noticeable change in straight on nose dive would occur with no other change except switching from a P type to an LT tire (same dimension, same psi). Stiffer sidewall is going to be offset to some degree by slightly smaller air chamber volume as well as the fact that air pressure utterly dominates sidewall construction as a stiffening agent, especially for straight compression. There should be very little difference in deflection per load/psi between the two tires.
On the other hand, I can imagine a difference being felt, at least under hard braking, where the mechanism is different. Namely, the LT tire takes longer to slow the truck due to both more weight and less traction, resulting in less nose dive.
On the other hand, I can imagine a difference being felt, at least under hard braking, where the mechanism is different. Namely, the LT tire takes longer to slow the truck due to both more weight and less traction, resulting in less nose dive.
OK so for S&Gs I went out and aired up from 32 to 40 psi and there is no difference at all except I feel the road more as I am driving... still nose dives as it did with 32... although this may have "some" play in to the nose dive it isnt enough to warrant the cost of new tires.... unless of course you want cooler tires lol I understand the rigidity of the sidewall and compression at stop but I think in the case of the 4R it is 98% suspension related. I would even go further to say shock wouldnt be enough to improve it much I higher spring rate in the coil is most likely the NEED
