I think the test was for autocross, I will try and find it

LOL one search and found it, http://grassrootsmotorsports.com/articles/whats-diff/

 

clyde that has to be the funniest thing i have ever heard you say/post....

 

Well, I have only a couple auto-xes in my STR car (and memories of the AS wheel spin) but I haven't experienced any wheel spin at all. That doesn't mean it won't come but I have a hunch that the AS wheels spin is a combination of really sticky tires and soft springs. In STR both of those factors are eliminated.

For my money (which I don't mind dispensing if I think it's worth it), I'll wait until I get the car more dialed in before I go fixing problems that I haven't experienced.

 

I can vouch for Erik's car, it's well mannered on an auto-x course. Though the car has a few mods that would make it illegal for STR, Erik certainly knows how to drive it. Maybe it's just set up for his' preference??? This is why I asked for his input. I watched his car when running a technical course I built and was very impressed. It's ability to power out of turns stood out in my mind. Thanks for the advice Erik!

The ability to leave a turn faster is far more important to me than the entry. I certainly don't want a car that pushes or takes forever to get around a turn. According to last season's datalogs, I'm slower entering turns than most my competition. The time picked up on my exit more than made up for the loss on entry. There are many reasons, pros and cons for this, but for me to get around a turn fastest, I need to be on the gas in the turn asap. Whatever can help with this is worth looking at for drivers like me.

I know this is all a bunch of bench racing and I'm certainly no expert, but we all have our own preferences when it comes to a car's setup. With so many variables to consider, I'm with Matthew ... get everything else sorted out first.

To Matt, we got plenty wheelspin last year at a few concrete sites with the CR on 275s with many different setups/settings. I have found the bumpy/banked surfaces with a lot of grip bring it out and nearly impossible to dial out. I thinks it's something we have to expect for the stock class S2000, especially in an AP1.

-Marc

 

Has anybody experienced wheel spin with stiffer springs/lowered suspension and street tires yet? Nick?

Maybe I haven't because my first spring rate guess was so off. I mean, how can you have wheel spin with copious amounts of push?

 

I don't get your point -- it sounds like you're trying to prove me wrong on something, but I can't tell what it is. That test wasn't specifically "for autocross" -- autocross is only mentioned once in passing, when describing the S2000 in a general sense. The car they tested with was a T3 road race car. And they didn't add a slalom to the course like they often do when doing autocross-centric testing.

You also danced around the more important point, which was that expecting a diff to make a difference of several seconds is unrealistic.

 

Agree!
In another note…I am looking for brake pads should we stick to stock since we are using street tires or what are you guys using. What about seats, what are the ST.. guys running since they have to be 25bl with seat mounts/ brackets.

 

I have a Recaro SPG but I don't have any rails yet. I've ordered a Titec rail but I think I will have to ballast the seat some to get it to 25lbs. THAT RULE IS DUMB. I mean the rule is aimed at keeping seats safe but it doesn't address the safety of the seat at all and it doesn't take into account the weights of commonly available seats and their sliders...

Regarding brake pads, I think stock will work fine. I've had no problems engaging ABS.

 

That isn't my understanding of the purpose of the rule. My understanding is that the rule is designed to eliminate people playing games with the definition of "seat". I remember a local SP guy a while ago who had a go-kart seat as the passenger seat in his car, which was little more than plastic shell that reached halfway up your back. By mandating a minimum weight that many street seats reach easily, you don't tempt / force people to install borderline seats to shave weight.

 

You are absolutely correct but if you look at the rule outside of the context of the case where people were installing tiny plastic seats, it's easy to see that the rule was ill-formed.

To approach safety issues, you approach safety issues, not weight issues. Duh. If you are going to approach it from a weight vantage then you better do some homework and pick a weight that commonly available seats and brackets more realistically approach. Some might say that since it's so difficult to get a seat to weigh 25lbs that the seats are less safe since they will have ballast attached in some manner that the seat manufacturer nor the rail manufacturer intended.

For example, how about a rule like this:

Seats must extend to at least the middle of the driver's helmet, must be covered on all seating surfaces, must be bolted to the floor using the stock mounting holes and must use sufficient mounting hardware as to resist deflection of over 1.5" (measured at the top of the seat head rest) in any direction.