Lateral acceleration - Chevy Impala SS Forum
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post #1 of 25 (permalink) Old 04-10-2004, 06:32 PM
SS9C1Man
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Anyone know the lateral acceleration(g's) of the stock suspension on our cars? Also any specs for the skid pad of a modified suspension?
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post #2 of 25 (permalink) Old 04-10-2004, 07:33 PM
SS9C1Man
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Ok I found some tests that state the stock lateral acceleration at .83 g's(Motor Trend) and .85 g's (Car and Driver). These sound low to me. I was also wondering if one could make these cars pull .95 g's. Lingenfelter got a 5200 pound Tahoe to do it, so I dont see why it would be so hard in our cars.
post #3 of 25 (permalink) Old 04-11-2004, 01:15 AM
AutocroSSer
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Stock is around 0.82g.

If I had to make a well-educated guess, my SS now is a bit over 0.9g on the street tires, and around 1.0g on the autocross tires. Yes, the tires make a BIG difference [img]smile.gif[/img]
 
post #4 of 25 (permalink) Old 04-11-2004, 01:41 AM
96roadmaster
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.75g here on the RM [img]graemlins/.gif[/img]
post #5 of 25 (permalink) Old 04-11-2004, 02:10 AM
SS9C1Man
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Ed,

With Eibach springs, an f-body front bar, GW lowers in the rear, bilstein shocks, and 275/40/17 Victorracers or Goddyear F1's you think high .90's are possible. I know you said your car pulled 1.0 g, and Im sure you dont want to give up all your secrets to retain a competitive edge, but what all have you done you your car that is different.
post #6 of 25 (permalink) Old 04-11-2004, 06:44 AM
bengston
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LOL, yup Ed's setup is Top Secret, "Eyes Only."

Off the top of my head;
T56
F-Body front bar/slightly stiffer than stock rear bar(seriously)
GW front springs/stock rears
GW rear lower arms with DelAlums/aftermarket uppers(rubber bushings?)
GW DelAlum FCA bushings
HAL QA1 shocks
"Sport tuned" alignment
Torsen T2R

I need to get a GTech to see what I am pulling with the spindle spacers. I know it's noticeably better on the interchanges now...
post #7 of 25 (permalink) Old 04-11-2004, 11:19 AM
AutocroSSer
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With the Victoracers and that setup, yes I think high 0.9x gs are possible/probable. Probably not with the Goodyears.

That is not saying the Goodyears are bad tires......in fact, they are very good for STREET tires. Better than my Yokohama AVS Sport street tires, as a matter of fact (which are pretty good in the dry, mediocre in the wet). Just there is a big difference in grip between even the "Best of the Best" street tires and a dedicated autocross/road race tire like the VictoRacer V700 or Hoosier R3S04/A3S04.

Only thing that Wayne missed on my setup (and it DOES make a big difference) is that I am running 275/40R17s on 17x9.5" in front and 315/35R17 on 17x11" in back. Even just going to 17x9.5" all around with the same exact tire as on a 17x8.5" rim (i.e. same 275/40R17 on either rim) will help a good bit.
post #8 of 25 (permalink) Old 04-11-2004, 04:22 PM
SS9C1Man
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Does anyone know if Global West has ever considered making a full set of lowering springs? I know there front springs may lower .5", but have they ever mentioned a full set that would lower an SS 1-1.25". Also, if the front suspension camber gains were fixed to be optimal, could it be possible to see 1.xx g's on the skid pad?
post #9 of 25 (permalink) Old 04-11-2004, 09:06 PM
AutocroSSer
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No they haven't, for a good reason. And this gets into why my car isn't lowered much either.

Namely, the suspension has a "sweet spot" geometry-wise where it works best. And, not surprisingly, it is pretty close to stock SS height.

BTW, the GW front springs basically don't lower an SS at all.

I don't think you'd see much cornering gain (maybe a little, but not lots) with the modified control arms versus a stock parts alignment that is "handling oriented". The real gain (IMHO) of the modified parts is that you'd be able to get the better handling WITHOUT having to run an alignment that is detrimental to tire life to do so (i.e. case on my car right now : handles great, but I'm not setting any tire life records [img]smile.gif[/img] )
post #10 of 25 (permalink) Old 04-11-2004, 10:19 PM
bengston
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Quote:
Also, if the front suspension camber gains were fixed to be optimal, could it be possible to see 1.xx g's on the skid pad?
To put it in a different perspective, when Chevy High Performance did their article on the Pro-Motorsports Spindle spacers, they took an older Camaro(255f/275r/45-17s) from .87 to .90 and from 60.60 to 62.93 in the slalom. Not a huge difference, but pretty good for no other changes. They stayed with -3/4 static camber.

After installing them on my car and going from -1/4 to 0.0 static camber, the increase in responsiveness and precision were major, while giving MUCH better highway manners, and probably do much more to aid "real world" handling than a skidpad benchmark would indicate. I will try to get an Impala owner who is into AutoX to try my car out for his impressions, next time I make it to a meet.

Just ordered a G-tech, so I should be able to see how my car compares to the old magazine articles.
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