1/4 Mile Difference? - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 07-13-2004, 01:03 PM
torr69647
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Just curious...would stiffer shocks/springs in the rear effect the quarter mile times? I would think the time would improve, since there is less energy being exerted downward on the rear of the car....is that true?
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post #2 of 14 (permalink) Old 07-13-2004, 01:37 PM
AutocroSSer
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It's tough to tell, since going stiffer in back can often hurt launch and make the car slower in the 1/4 mile.

It's more of a "how is the car set up" kinda thing.....
post #3 of 14 (permalink) Old 07-13-2004, 04:50 PM
CMoney
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Get some HAL 12-way shocks and you should be alright.
 
post #4 of 14 (permalink) Old 07-13-2004, 05:59 PM
96capriceMGR
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I contacted HAL after hearing reports that they would puke after just one cold winter, while they did not come out and admit that is a problem they saud they did not recommend them for daily drivers in my climate. WI is colder in winter than PA(trust me I grew up in NW NJ) so judge for yourself and based on your usage of the car wether HALS are right for you. Having them in front can definetely help the launch.
post #5 of 14 (permalink) Old 07-13-2004, 06:14 PM
NeverFollow
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Stock SS springs, Bilstiens in all four corners, F body sway bar, HA rear bar with BMR adjustable rear control arms. This setup got me to the 4th fastest bolt on car on the ET page.

I don't believe a stiff setup isn't the worst thing at the strip.
post #6 of 14 (permalink) Old 07-13-2004, 08:29 PM
AutocroSSer
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Eric : stock springs isn't a very stiff setup

I can just tell you that changing spring rate much at all (even 10-20%) in back had negative effects on straight-line launching. Take that for what it's worth.....

And in front, lets just say my setup (which is, umm, "not soft" ) isn't conducive to weight transfer either....
post #7 of 14 (permalink) Old 07-13-2004, 08:37 PM
9C1LT195
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I got a 1.74 60' time on my only good run (with current mods) with GW front springs, rear Impala springs, Konis at their stiffest settings, HO bar and GW rear control arms. I agree that with a good track preparation and a naturally aspirated 350 there is no need for a lot of suspension work to hook on drag radials.
post #8 of 14 (permalink) Old 07-14-2004, 07:27 AM
Leadfoot
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I run a stock type setup, and I've had a best sixty of 1.69, so far, and it will go down even further. I've got plenty of motor, too! I run the firmer Bilsteins all around, stock springs, Hotchkis front and rear swaybars, and upper and lower trailing arms.

Good track prep, and Hoosier 15X11.5 QTP's give me consistent low 1.70's, every time out. Suspension work really isn't necessary, with good tires, and a good track, unless you have a monster motor, and a monster shot of juice! HTH
post #9 of 14 (permalink) Old 07-14-2004, 12:53 PM
FAMILY TRUCKSTER
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I think stiffer is better as long as you can maintain traction. (I'm sure the girls would agree [img]tongue.gif[/img] )

I had a real traction problem with my wagon with it's stock springs (this was during stage 1 on my sig) On the street or track it would wheel hop like crazy. Even with the airlift bags aired all the way down. The stock wagons are 225# springs.

This spring I installed stock Civi Caprice springs (140# springs (Impalas are 160#)) that I got free from the board. Put headers, Hot cam, and a 2500 converter in it and went from 15.1's and 90 MPH to 13.7's at 98 MPH and my 60' went from 2.1xx to 1.9xx (This is on the same 275-60 15 Kelly road huggers)

I picked up two tenths in the 60' and traction is still better than with the 225# springs. I now need slicks because I still get a little tire spin off the line and am breaking them loose again going into 2nd gear.
post #10 of 14 (permalink) Old 07-14-2004, 02:19 PM
NeverFollow
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Quote:
Originally posted by AutocroSSer:
Eric : stock springs isn't a very stiff setup

What do you mean? They also have 169k on it.
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