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Post Info TOPIC: Suspension tuning


- Durand -

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Suspension tuning
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Found a track launch video.

Not the best but shows a couple of problems.

What do you all think?

I have a couple of possible remedies.

 

 



-- Edited by LaVelle on Tuesday 27th of February 2018 09:32:38 AM

Attachments
MVI_0018 (2).MP4 (9,516.6 kb)
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'65 Pontiac Lemans 468 t400 4.10 12 bolt

Best ET  11.43 @ 117.7




- wondah whooooaman-
Colorado Springs


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LaVelle wrote:

Found a track launch video.

Not the best but shows a couple of problems.

What do you all think?

I have a couple of possible remedies.

 

 



-- Edited by LaVelle on Tuesday 27th of February 2018 09:32:38 AM


Drop a couple of jet sizes or be sure the carb is unloaded before you stage.

The only thing I can see is the front end drops too quickly, when the front end goes down you can see the rear suspension unloads as the wrinkles stop.  At the hit, your tires spin but they wrinkle well which to me indicates the car is planting them at the hit and it leaves straight and level.  You could try softening the rear shocks a bit to get it to squat  but I think the car launched pretty damn well. 



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Mark
69 Chevelle SS
"Carpe Jugulum"
"Only those who have never learned self-restraint fear reasonable discipline" T.R. Fehrenbach

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- Durand -

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It got broke in on the way to the track, and being on the fat side is better than lean, for first outings in my book.

I've been playing the video over and over, forwards and back, etc.
Seems to me that the front is rising to quickly and unloads the rears when it hits the suspension stops.
I have Lakewood 90/10's on the front, and I am thinking of going back to stock front shocks for cheap testing.

Am I crazy and seeing things or headed the right direction?

The rear I/C seems close, no separation but no squat either.


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'65 Pontiac Lemans 468 t400 4.10 12 bolt

Best ET  11.43 @ 117.7




- wondah whooooaman-
Colorado Springs


Status: Offline
Posts: 3463
Date:
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LaVelle wrote:

It got broke in on the way to the track, and being on the fat side is better than lean, for first outings in my book.

I've been playing the video over and over, forwards and back, etc.
Seems to me that the front is rising to quickly and unloads the rears when it hits the suspension stops.
I have Lakewood 90/10's on the front, and I am thinking of going back to stock front shocks for cheap testing.

Am I crazy and seeing things or headed the right direction?

The rear I/C seems close, no separation but no squat either.


The car reacts like its supposed to, it moves forward first then rises.  If it would've hooked, no doubt it would have carried the front wheels a good distance.  I concur with the I/C.  Perhaps you could play with pinion angles to see if it will plant the tires harder.  As I said, the car launches very well. 



__________________
Mark
69 Chevelle SS
"Carpe Jugulum"
"Only those who have never learned self-restraint fear reasonable discipline" T.R. Fehrenbach

http://www.chevelles.com/showroom/data/500/showpic1.jpg
http://www.chevelles.com/showroom/da...ium/motor2.JPG
http://www.chevelles.com/showroom/data/500/breakout.JPG


- Durand -

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Thank you, I'm not unhappy with how it's performing now, but will possibly be shortly after the new engine.

Pinion angle was on the list.
I need to get adjustable upper control arms before I can play with that, and I'm penny pinching right now saving for the new engine.( Pat's motor is still in it.)
And if a stock set of shocks will work better than the 90/10's, I'll buck up the $50 for a set now.
If I could afford it I'd just order a crate full of stuff from UMI.

I need to figure out the small tire game, as I blatantly refuse to back half/big tire it for reasons other than just the cost.
I have 28/11.50-15 ( 275/60-15 ) M/T bias street slicks now, and will try the 295/65-15 M/T radial street slick next,( if they will fit) to get a little taller tire next go round.

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'65 Pontiac Lemans 468 t400 4.10 12 bolt

Best ET  11.43 @ 117.7




- Mike -
Puyallup, WA


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I can still see wrinkles in the rear tire pausing the video at different intervals and at the end of the view. It seems to slightly slip after the initial hit but the wrinkles never stop.

It seems to me your IC is pretty close and maybe your shocks could be working a little bit better but nothing is drastically wrong.

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'67 Chevelle -- 383ci, Jerico DR4 4 speed -- 3.19 1st gearset, Gear Vendors Overdrive/Underdrive, Strange S60 w/3.54 gears

'70 Camaro -- In the works TT 6.0L, 4L80E, ??? rear end 



- Durand -

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Got a pair of new Competition Engineering 3 way adjustable shocks for $50 bucks from a buddy yesterday.
I'm going to try them at 60/40 and see what happens -vs- the 90/10's.

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'65 Pontiac Lemans 468 t400 4.10 12 bolt

Best ET  11.43 @ 117.7

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