Autocross- SCCA EV-X Class vs. SS

[Lindenwood]

Okay, I have settled on around 35-36psi on the street for my all-seasons as the best compromise between precision and grip.

Still, the front end tactilely and audibly starts breaking loose by around 52mph, which is over 20% less lateral grip than the previous 58mph max on the same turn (given centripetal force goes up with the square of velocity).

I am still landing on the hypothesis that the tires don’t have enough initial grip to roll the chassis over to flatten the contact patch. Unfortunately, my wheels won’t fit at less camber than my current 3.2F / 2.3r camber.

Will all this go away on better tires (that have enough grip to roll the body to flatten the contact patches) or am I missing something else?

Help!!

@gearchruncher @MasterC17 et al.

 

[The Other Dan]

And Nats just capped out at 1300. In 4hrs

With 9 now entered in EVX. Should be a good event.

 

[gearchruncher]

9 cars in EVX! We will actually have some competition for the first time! Even the SCCA can't hold back the EV revolution.

Maybe this will finally get the PAX adjusted afterwards too. Or they will just claim we all are awful drivers and EVX is still quicker than SS, for reasons

 

[gearchruncher]

Someone needs to get the car in SS to move to EVX so we can have a full 10. Is there any point in being in SS even if you're completely stock? Does 10 get us an extra trophy slot?

 

[dsgerbc]

Someone needs to get the car in SS to move to EVX

Or the SSP car for that matter. Although I hope Cameron does it on his own, seeing that there's 9 people registered.

 

[gearchruncher]

Or the SSP car for that matter. Although I hope Cameron does it on his own, seeing that there's 9 people registered.

I assume the he's in SSP because he wants to run Hooisers though?

 

[M3Pdude]

Traded the tesla in on a C8 Vette (on the list for the ERAY). I need to sell 4 Konig Hypergram Matte Grey Wheels 18x9.5 5x114.3 35mm with Yokohama A052 275/40-18. I used these wheels for a couple years in EVX. The wheels have some cosmetic issues but are not damaged in any way. Tires probably have 25% life left.

$700

I'm willing to deliver around central Florida (within reason), otherwise, you pay shipping.

 

[gearchruncher]

As someone with a C8 on order as well... So which one is faster at AutoX?

 

[M3Pdude]

The tesla so far. I have had the vette at 2 events to far on PS4S's and on those tires it understeers hard. But, even with those tires it's mid pack in the local SS class filled with GT3s and 4s. Forged wheels, RE-71RS's and front sway bar are on the way. I have a feeling it will transform the car. Oh, and it sounds amazing!!

C8 autox run

 

[SK360]

The tesla so far. I have had the vette at 2 events to far on PS4S's and on those tires it understeers hard. But, even with those tires it's mid pack in the local SS class filled with GT3s and 4s. Forged wheels, RE-71RS's and front sway bar are on the way. I have a feeling it will transform the car. Oh, and it sounds amazing!!

C8 autox run

It's probably the factory alignment, I hear they're setup to understeer terribly from the factory to stop boomers from killing themselves with the weight in the rear. Get it switched over to the recommended track alignment

Planning on getting a C8 on order next year. I would trade the Tesla for one but I need to be able to transport the baby

 

[gearchruncher]

Planning on getting a C8 on order next year.

So you're buying one in 2025?
Had one "on order" since 2021 and nowhere near getting one. Thankfully the used prices are dropping below MSRP now.

 

[SK360]

So you're buying one in 2025?
Had one "on order" since 2021 and nowhere near getting one. Thankfully the used prices are dropping below MSRP now.

Wow.. with a local dealer? High volume dealers are saying 8-10mo

 

[The Other Dan]

One of the fast guys I autox with has a C6 z06, C7 z06, and a c8. He says the C6 is the only competitive car in their respective classes. He runs the C6 in AS. Gear- I'll introduce you to him next weekend so you can pick his brain.

 

[gearchruncher]

Wow.. with a local dealer? High volume dealers are saying 8-10mo

Ciocca- Deposit in Nov 2021, still nowhere near being able to order one at MSRP.

 

[gearchruncher]

He says the C6 is the only competitive car in their respective classes.

A C8 trophied at nationals in 2021 and 2022 (the only years it could), and it costs half what a GT4 or GT3 does. That's competitive enough for me, especially after driving a BS car in SS for years

Still would like to talk to him though!

 

[dsgerbc]

One of the fast guys I autox with has a C6 z06, C7 z06, and a c8. He says the C6 is the only competitive car in their respective classes.

Not for long, given the upcoming SS/AS/BS reshuffle.
Personally, I'd rather pick up a C7 GS.

 

[dsgerbc]

9 cars in EVX! We will actually have some competition for the first time! Even the SCCA can't hold back the EV revolution.

Maybe this will finally get the PAX adjusted afterwards too. Or they will just claim we all are awful drivers and EVX is still quicker than SS, for reasons

Down to 8
One Tesla went to XS.

Which reminds me: what's the consensus, rear camber+toe arms = potentially protestable in EVX? I'm thinking I could use more rear camber for higher-speed national courses, But I don't want to lower further to get that camber.

 

[Lindenwood]

Even with my race tires the front is breaking loose at about 58mph, compared to well above 62mph (the limit of my courage) on the Comfort coils. So, with 200tw tires I am basically hitting the same traction limit as before on all-seasons.

It certainly feels good the crisp way it handles, but honestly I might go back…

 

[M3Pdude]

It's probably the factory alignment, I hear they're setup to understeer terribly from the factory to stop boomers from killing themselves with the weight in the rear. Get it switched over to the recommended track alignment

Planning on getting a C8 on order next year. I would trade the Tesla for one but I need to be able to transport the baby

Done. I just had all the GM recommended track prep done, which includes the alignment with 3 deg front and 2 deg rear neg camber. Front sway bar is going on this week. Did I mention the sound?

 

[tm1v2]

Even with my race tires the front is breaking loose at about 58mph, compared to well above 62mph (the limit of my courage) on the Comfort coils. So, with 200tw tires I am basically hitting the same traction limit as before on all-seasons.

It certainly feels good the crisp way it handles, but honestly I might go back…

@Lindenwood Something doesn't add up to me. Can you set the Sports to your previous height and then get a full alignment? Maybe you just have too much static camber no matter the tires.

If that doesn't do it, ask MPP for advice...

Just how rough and bumpy is this particular ramp?