"AntiSpeed" (AntiSpeed)
04/08/2019 at 00:34 • Filed to: None
7
6|
"AntiSpeed" (AntiSpeed)
04/08/2019 at 00:34 • Filed to: None | 7
| 6 |
!!! UNKNOWN CONTENT TYPE !!!
Using an SCCA Regional to test the car ahead of the F1600 Championship Series, we spent the weekend at Summit Point in the eastern panhandle of West Virginia.
We were supposed to get a lot of running in on Friday but it rained, then we missed Saturday qualifying due to leaving our SCCA Logbook at home. It was mailed to the track in time for Race 1 and the track was still very slippery on Saturday morning anyways. Race 1 on Saturday and Race 2 on Sunday went well, I was 2.5 seconds faster than our shakedown last year (when we didn’t know it but we had a dying engine) and set a lap record for the Mid-Atlantic Road Racing series. It’s still several seconds off the F1600 Pro series that I’m running this year, but it was on old tires, no draft, I wasn’t pushing through the dangerous Turn 4, and there’s still plenty of speed in the car’s setup.
I’m still struggling with too much rear brake bias. There’s an adjuster in the cockpit but it’s only good for a certain range, and right now we’re outside of it. If I can get more confidence in the straight-line braking stability I’ll be able to brake later, harder, and carry more brake past turn-in to better rotate the car. I have brake pressure sensors installed in the car but only one of them is working, and while it works, I can’t figure out how to zero it.
I also had a good bit of power-on, corner-exit understeer. Particularly in the high speed sections. The esses (7-9) and coming off Turn 10. I softened the front anti-roll bar (I have an adjuster in the cockpit) and it helped a bit, I think also increasing the rear tire pressure helped a tiny bit . My dad didn’t have a hot pit pass so he couldn’t take hot pressures. The understeer was manageable but something to keep in mind when we come back in August.
We’ll be at Road Atlanta in two weeks for the Pro Series season opener. There are currently 14 entries and expected to be a few more, so it should be a good field. Last year we had engine problems, this year I expect to be well into the top half of the field.
gettingoldercarguy
> AntiSpeed
04/08/2019 at 01:40 |
|
Love reading the updates and can't wait for the video.
NYankee1927
> AntiSpeed
04/08/2019 at 09:55 |
|
How does your static bias feel? Is that close and it is an on-track phenomenon only? Also is your bias bar actually moving back and forth in the pedal? I assume you have that setup. Sometimes those stick and it just moves other components around without actually affecting bias.
|
AntiSpeed
> NYankee1927
04/08/2019 at 21:03 |
|
What does static bias mean? We should have the car back in the garage tomorrow, and I’ll be able to take a look at it then.
|
NYankee1927
> AntiSpeed
04/08/2019 at 22:44 |
|
Static brake bias (it may be called something else for all I know) is the first step in setting a car’s brake balance to make sure it is safe on track. It involves putting the car up on stands with the driver in it with a helper that will be trying to rotate the wheels. The driver will apply the brakes just hard enough so they lock when the helper puts a set amount of torque on the wheel (by feel or torque wrench or whatever is available). Then, while applying the same brake force, the helper goes to the back to see if they can rotate the tire, if so, good, if not, then you probably have too much rear brake bias.
Do this to not only set a good baseline, but to see how much adjustment your brake bias knob is actually doing. Know what it means to be at the extremes, or if is even doing anything at all.
|
NYankee1927
> AntiSpeed
04/08/2019 at 22:47 |
|
Don’t just take my word for it. Below is a picture from Carroll Smith’s Drive to Win, page 2-28. If you haven’t read his series of books, they are a must read. Especially for racing Formula Ford. A lot of the advice is all still relavent.
|
AntiSpeed
> NYankee1927
04/08/2019 at 23:37 |
|
Oh yea, I’ve had some friends who are real professionals help with that. We may need to re-do it because it’s still off.