Notices
Brakes & Suspension 350Z stoppers, coils, shocks/dampers

Weird Incident with Suspension Porpoising

Thread Tools
 
Search this Thread
 
Old Apr 22, 2003 | 01:11 PM
  #1  
jimster716's Avatar
jimster716
Thread Starter
Registered User
iTrader: (3)
 
Joined: Jan 2003
Posts: 1,426
Likes: 0
From: Irvine, CA
Default Weird Incident with Suspension Porpoising

Has this happened to anyone? I was going on my morning commute on a main road doing about 50-55mph. I had to get on the freeway which runs perpendicular over the road i was on. So i merged right to get on the onramp which is a fairly tight half-circle.

As i get on the onramp i have to slow down so I downshifted from 3rd to 2nd...at the same time the road surface changes right at the transition from main road to onramp. We all know the suspension is bouncy. As i apply power (not much, i wasn't racing..just going to work) on this not-that-bumpy road surface my rear tires actually chirped. I think the porpoising around a turn actually made my rear get slightly airborne and the chirping let me know my tires had caught on the way back down. It wasn't a squeal from a progressive loss of traction...it was launch chirp.

I was like WTF?!!! This is crap. It never happened to me in my jza80 supra nor any of my other cars. Dammit...my teins better get in soon...tired of getting motion sickness from trying to see through my rearview mirror.
Reply
Old Apr 22, 2003 | 02:11 PM
  #2  
2003z's Avatar
2003z
New Member
iTrader: (7)
 
Joined: May 2002
Posts: 4,959
Likes: 0
From: Atlanta
Default

happened to me on the track, I didn't blip the throttle first, and when I downshifted to 2nd, the wheels chirped. Its actually like a reverse chirp, not when you upshift. In this case your engine revs were at a lower speed than what it would have been had you accelerated to the same speed in 2nd gear, if you can picture what I am saying. It was more of a skid before the engine speedcaught up with the tire speed.
Reply
Old Apr 22, 2003 | 02:59 PM
  #3  
jimster716's Avatar
jimster716
Thread Starter
Registered User
iTrader: (3)
 
Joined: Jan 2003
Posts: 1,426
Likes: 0
From: Irvine, CA
Default

Originally posted by 2003z
happened to me on the track, I didn't blip the throttle first, and when I downshifted to 2nd, the wheels chirped. Its actually like a reverse chirp, not when you upshift. In this case your engine revs were at a lower speed than what it would have been had you accelerated to the same speed in 2nd gear, if you can picture what I am saying. It was more of a skid before the engine speedcaught up with the tire speed.
I understand what you're saying...almost what would appear to be something like an abrupt engine braking resulting in a chirp/skid. hmm could've been..i just have never experienced that before and the speeds and downshift weren't particularly a racing situation..more like normal driving. I don't know...i haven't been able to repeat this though i havent exactly been trying to. either way..thanks for the insight.
Reply
Old Apr 22, 2003 | 10:49 PM
  #4  
bobowah's Avatar
bobowah
Registered User
iTrader: (5)
 
Joined: Dec 2002
Posts: 1,218
Likes: 0
From: Palos Verdes, CA
Default

I've noticed that my slip light activates alot dues to the funky spring rates.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Uriyo_
Exterior & Interior
22
Sep 8, 2021 08:46 AM
Lt_Ballzacki
Brakes & Suspension
39
Aug 6, 2021 06:19 AM
350Z_Al
Exterior & Interior
133
Oct 29, 2020 07:44 PM
kyin
New Owners
12
Oct 15, 2015 05:54 AM
MicVelo
NorCal Marketplace
9
Oct 4, 2015 07:55 PM




All times are GMT -8. The time now is 03:27 AM.