| [ Total Views: 1293 | Total Replies: 19 | Thread Id: 53754 ] |
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 speedster356
A.k.a.: Peter Mcleod
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| posted on June 27th, 2006 at 09:09 PM |
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squatting under acceleration
I would like to decrease the squatting I see on acceleration. I'm pretty sure I nead to stiffen the rear up by either increasing the dampening rate
in the rear shocks or would it be better to increase the spring rate? Would stiffer front shocks have the same effect?
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Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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lohoon
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| posted on June 27th, 2006 at 09:26 PM |
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What if you try some type 3 torsion bars in the rear?
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speedster356
A.k.a.: Peter Mcleod
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| posted on June 27th, 2006 at 09:33 PM |
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Forgot to mention that it isn't a VW rear but it's still a trailing arm suspension without torsion bars (has coil overs) and a balljoint front end.
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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lohoon
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| posted on June 27th, 2006 at 09:47 PM |
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Can you adjust the spring rate on the coil overs?
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bajachris88
A.k.a.: Chris Leete
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| posted on June 27th, 2006 at 09:48 PM |
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Front spoiler! hehe. Push that nose down 
Doesn't the country buggy have something that puts the nose down under acceleration? A bloke called Michael when i was at MidlifeCrisis's house
(Marc) was educating me about it. was interesting actually.
(ô_!_/ô) (ô_!_/ô)
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speedster356
A.k.a.: Peter Mcleod
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| posted on June 27th, 2006 at 09:58 PM |
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I'll have to change the actual springs to change the rate, dampening and ride height are adjustable.
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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VWCOOL
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| posted on June 27th, 2006 at 10:01 PM |
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make the damper compression stiffer; it might help a bit without making the low-speed ride stiffer (if u care!)
I did that to mine (stiffer shocks) after I started lifting inside front wheel on corners
[ Edited on 27-6-2006 by VWCOOL ]
Pay your debts, CxxT
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BiX
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| posted on June 28th, 2006 at 07:59 AM |
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Also what about stiffer rebound on the front shocks to help stop the weight transfer? other than that, as above stiffer rear shocks or springs.
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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Craig Torrens
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| posted on June 28th, 2006 at 09:06 AM |
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drive slower:P
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BiX
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| posted on June 28th, 2006 at 09:50 AM |
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Is it the squating when launching or under acceleration down the straights etc? if its launch, shocks should be able to fix it, if its on the
straights its a spring thing......
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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71EJVan
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| posted on June 28th, 2006 at 03:24 PM |
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Stiffer rear springs will give you more steering at speed. You may need to look at both front and rear spring rates to keep balance and also play with
dampers at the rear.
Brendan
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koolkarmakombi
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| posted on June 28th, 2006 at 06:22 PM |
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Increase the compression damping and tighten the preload on the rear. A small increase in rear ride height may help too.
Stiffer front shocks will make it worse as it will keep the front up.
luck,
KKK
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bat69
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| posted on June 28th, 2006 at 07:02 PM |
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Is there any reason why you want to stop it squating in the rear the way it does? i.e. hits bump stops, $hit handling etc. At least you know the rear
suspension is working.
White Knuckle Racing Team
"Drive it like dirt"
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speedster356
A.k.a.: Peter Mcleod
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| posted on June 28th, 2006 at 08:42 PM |
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On hard acceleration in mid corner or later the rearward weight transfer unsettles the car and tends to understeer. Seems to me that a lot of energy
is wasted in pointing the front to the sky:P
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on June 29th, 2006 at 06:29 AM |
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Hi Pete,
I would agree with what has been said already by BiX and others.
Shock compression rates may do what you want,
but will just delay the inevitable squat that comes with light spring rates(rear).
Were talking 10 second power levels here!
Try stiffening the rear compression, and front extension, but you may develop traction issues.
Any photos of the trailing arms and shock mounts?
DB.
| Quote: | Originally
posted by westi
That's mad Alan.
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on June 29th, 2006 at 06:32 AM |
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It is probably a big job, but you may like to move the pivot point
of the trailing arm up on the chassis?
It depends on the COG height, but this mod can reduce weight transfer.
| Quote: | Originally
posted by westi
That's mad Alan.
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speedster356
A.k.a.: Peter Mcleod
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| posted on June 29th, 2006 at 07:23 AM |
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Moving the trailing arm pivot point is a mod that is quite common with the 914 racing guys (mine has 914 rear). My program will be in this order:
1: Stiffen compression rate in rear shocks. (no mod required)
2: Measure spring rate (I don't know what it is ATM ) and increase rate.
3: Fit 2 way adjustable shocks to the front so I can have some variobility in extension and compression rates.
4: Move rear pivot points up.
cheers:beer
Spyder-WISD 07-09-05 11.6s @ 125 MPH
Speedster-WISD Nats 05 14.4s @ 89 MPH
Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm
Weaseling out of things is what separates us from the animals....................Except the Weasel.
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BiX
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| posted on June 29th, 2006 at 09:45 AM |
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I would also include modify/change front springs rates to suit rears, if you want to keep the handling front to rear the same. You may also be able to
decrease sway bar dia with the stiffer springs, as this will keep roll the same, will making the car stiffier in pitch?
But then the car could get to stiff.......
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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amazeer
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| posted on July 3rd, 2006 at 08:03 PM |
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Increase rear spring a fair bit, rear shock a little bit, + probably remove rear sway bar completely to maintain drive on inside wheel, trim with
front sway bar.
Or, put a massive turbo on so you dont get any acceleration out of corners 
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fullnoise
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| posted on July 7th, 2006 at 09:43 PM |
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Tyres
Before you stiffen the rear springs:
The Yokohama A048s you now have on the rear have a stiffer construction which works like a heavier spring. Many of the competitors who have moved from
the A032 to the A048 have had to soften the rear spring rates.
That won't help the squatting issue but you may go the wrong way in your set-up unless you allow for the stiffer construction.
CYA CT
esratrams
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