I'm running this year in a local street tire class that would allow me to use the lower perch on my shocks. On a car otherwise set up in AS trim (Comptech FSB, Revalved Konis), is there any advantage to doing so?

The only reason I ask is that it's time for an alignment, and If there is I'd rather do it now before I get it aligned if I'm going to make the change. I'm not really concerned with looks, etc ... or worried about the other problems of having a car that is lower than stock, since it's pretty much an autocross and weekend fun car. But I'll take any advantage that's legal (and free)!

If it makes any difference, I'm running 225 / 225 direzza star specs. Haven't run them on course yet, but I picked them up cause I got a good deal on them, and from the street driving I've done, I think they'll be worlds better than the Hankooks I was running before.

Thanks in advance for any information.

 

Has anyone done any analysis on the effects of ride height on suspension geometry (camber curves, steering, roll centers, etc.)?

In for links

 

You ever plan on doing events outside of your local region, the lower perch will not pass for stock class, so I would leave it.

 

Yeah traditionally for AS (even tire AS) you can't change the perch and be legal. Leave it alone, besides you can get plenty of camber as it is.

 

You would not be legal for A Stock anywhere outside your region. Do you ever plan to run any Divisional, National Tour, Pro SOLO, or Nationals?

 

I do not plan on running AS this year. I'll probably run one divisional, but since I'm on street tires, and won't be competitive anyway, I can run BSP if I lower the car.

I understand what modifications I can and can't perform for different classes, I'm trying to figure out if there is any performance benefit to lowering the car with my current setup.

I was planning to go back to race tires this year, but I've already missed half our season, half our divisionals, and nat tour, so I'm going to save some $$ and wait till next year.

 

So test it out and report back here with results. I would find that interesting reading.

 

Yeah looks like I might have to. Unfortunately, I don't have any data logging. Not sure if my butt dyno is good enough to provide accurate information.

Does anyone see any reason other than the classing issue that I shouldn't test it?

 

Generally speaking, lowering your car will allow you to get more camber, if you need/want more camber. Depending on how much you lower it, you run the risk of hitting the bumpstops in turns, which would have a material adverse effect on handling.

As Mike says, the only way to really tell with your car, your driving and your courses is to try it out.

 

I see. Well, if it came to that, I would invest my money in a datalogger before I invested in new springs. In fact, that's what I did -- I bought my datalogger before I installed my KWs.