What Do You Call It When...

[Tony de Wonderful]

When you go over a bump and the G's force your foot down further on the throttle, the car speeds up/lurches, foot comes up, then down in this horrible lurchy/jerky acceleration/deceleration of repeat, repeat, until to lift your foot off. Some sort of positive feedback or something going on?

I'm finding this happens more now I've stiffened up my suspension and put stiffer sway bars on.

It tends to happen at certain intersections in 1st or 2nd gear.

Kind of embarrassing.

Anything I can do?

[Hanaldo]

Lol how fast are you going over said bumps? Because if you are going fast enough for the G-forces to push your foot down, i really wouldn't be worried about the embarrassment of lurching lol...

[Tony de Wonderful]

Lol how fast are you going over said bumps? Because if you are going fast enough for the G-forces to push your foot down, i really wouldn't be worried about the embarrassment of lurching lol...

Hmm not that fast, but I've been driving a bit more 'uninhibited' now I've got some mild mods.

I've had my foot totally on the floor a few times lately just to test the car out. Within the speed limit of course and with no loss of traction.

[woggin]

hehe, i know wat you mean, my aristo has fairly stiff suspension and this happens to me wen i drive over bumps n stuff, i have found letting off the gas until the car settles is your best bet!!

[Nic_A31]

Just let it roll at idle rpms when you're going over speed bumps.

Reasons speed bumps are there - to make people drive slow.

[Benzino33]

its normal with harder suspension, mine does it all the time, unles i jus roll the car over the speed hump

[Hanaldo]

I don't think he means speed bump, just any bump... I can't say i have experienced this though lol. Maybe i have, but i wouldn't describe it the same way as you haha. Don't really understand

[Tony de Wonderful]

I don't think he means speed bump, just any bump... I can't say i have experienced this though lol. Maybe i have, but i wouldn't describe it the same way as you haha. Don't really understand

Yeah not speed bumps as such, I don't go over them fast. I mean just the bumpy/poor surfaces of intersections etc.

We've got some real cr@p roads here in Perth that is for sure.

Yeah taking your foot off the gas until the car settles seems to work, but this seems to mean that with some traffic lights/intersections you just can't do a 'hero' type launch....er hypothetically that is. I guess that is the prices of stiff suspension for good cornering?

[stormtrooper]

hehe, i know wat you mean, my aristo has fairly stiff suspension and this happens to me wen i drive over bumps n stuff, i have found letting off the gas until the car settles is your best bet!!

You just answered your own comment there, your aristo (read barge) is so bloody heavy it NEEDS stiff suspension to eliminate all the commodore like bodyroll.

As for the lurching, what sort of clutch do you have? How much play do you have with your release point etc? Might just want to give it a few move revs before you engage the clutch. Your suspension doesn't have anything to do with how you're using the clutch

[bubba]

More revs so it spins over the bumps or just take your heel off the floor, you'll probably find your foot is less inclined to bounce around with the bumps if it's not contacting the floor.

[SKYRYAN]

learn to clutch

[bubba]

Fair dinkum guys, he's not talking about jerky clutch take offs.

He's talking about going over a bump and that bump translates into his foot moving slightly on the throttle.

Rysies, why would you clutch in when rolling through an intersection? if anything you'd just lift off the gas or just raise your heel off the floor.. that's what I do, especially over railway tracks.

[gazza750]

learn to balance your foot properly on the accelerator and you wont have any probs

[Ten Four]

Pedal to the metal.

[Nic_A31]

Can't beleive how many replies there are to this with no flaming - he's asking for advice on driving over a speed bump...

[Hanaldo]

Hmmm i think i get it, seem to remember this happening when i was first on my L's... No offense intended with that lol. Just that in my first car i learned to do what these guys are saying, balance your foot on the accelerator and make sure your heel isn't on the floor.

In the Skyline it doesn't happen to me anymore because i make sure to not go over said bumps lol, ive replaced one rim already from Perth's sweet road surfaces, making sure it doesn't happen again

[Birds]

He's not talking about speed bumps, he's talking about shitty roads with holes and bumps. Don't worry mate, it is a normal by-product of stiff suspension. All your controls become extra sensitive as a result. Bumps make you lose traction very easily too. As for taking off from the lights, you can either:

A. Wedge your foot against the kick panel so that it is less likely to move when going over bumps

B. Lift off throttle and just coast in gear or use a bit of clutch over the shitty parts of the road to turn power on/off. Or if in a drag race...

C. Foot flat to the floor and let an LSD take the blame.

With my coilovers I don't bother with traffic light heroism on shitty roads, particularly uphill...you'll just get messed up in 1st gear.

[bubba]

Can't beleive how many replies there are to this with no flaming - he's asking for advice on driving over a speed bump...

No he isn't. Learn to read the thread properly before making stupid posts.

[Nic_A31]

I've read this thread a few times for shits and giggles - the guy can't drive his car.

I've got stiff suspension, a monster clutch and the roads around here are f**ked, maybe I'm just used to it but I have no drama's, my driveway is even worse and I can reverse up that without spitting gravel. I didnt get my license from the bottom of a Fruit Loops box..so I dunno.

[bubba]

I've read this thread a few times for shits and giggles - the guy can't drive his car.

I've got stiff suspension, a monster clutch and the roads around here are f**ked, maybe I'm just used to it but I have no drama's, my driveway is even worse and I can reverse up that without spitting gravel. I didnt get my license from the bottom of a Fruit Loops box..so I dunno.

You've read it a few times and still didn't know what he was talking about?

How about you shut up now.

Edited October 29, 2009 by bubba