rain practice

[Grant]

For rain practice I go out to my local track and drive literally the worst thing possible in the rain: A C6Z with a hair throttle (102 mm Nick Williams which can't be re-mapped), ~136 mph trap speed, big tires that love heat, and cam that comes on pretty suddenly, front-biased downforce, and a super lightweight clutch that tachs to the moon as soon as you get wheelspin.

 

I didn't have my daq on me so these aren't serious laps. I just think it's funny how terrible this car is with a little water down. It goes from 1:12s to 1:32s
 

 

Edited August 19, 2021 by Grant

[Bandit]

Looked at some other vids and was kind of surprised to see the ZO6, in the dry, as having just a skosh more cornering speed in the hairpin versus your way lighter NC.

[mender]

12 hours ago, Grant said:

For rain practice I go out to my local track and drive literally the worst thing possible in the rain: A C6Z with a hair throttle (102 mm Nick Williams which can't be re-mapped), ~136 mph trap speed, big tires that love heat, and cam that comes on pretty suddenly, front-biased downforce, and a super lightweight clutch that tachs to the moon as soon as you get wheelspin.

 

I didn't have my daq on me so these aren't serious laps. I just think it's funny how terrible this car is with a little water down. It goes from 1:12s to 1:32s
 

 

Reminds me of running the Fiero in the rain... looks like fun!

 

We did an event at the Ridge that featured lots of rain, and that quickly pointed out the deficiency of the intake system. The air filter got soaked and caused the engine to buck hard, breaking an engine mount and the exhaust. Got things fixed, chained the engine down onto the broken mount and went out to test. It worked well, and I was running about two seconds a lap faster than the leaders. Our Conti Extreme Contact tires worked very well in the heavy rain.

[Grant]

5 hours ago, Bandit said:

Looked at some other vids and was kind of surprised to see the ZO6, in the dry, as having just a skosh more cornering speed in the hairpin versus your way lighter NC.

Good catch, yes and I haven't gotten a 100% C6Z dry lap yet (though I think the hairpin was). That surprised the hell out of me, as well as T1 speeds. The C6Z is on Supercar 3Rs, which I guess are a much better tire than Cooper RS3-Rs. Those are the tires GM put on the ZL1 1LE to get it such great lap times. On a C6Z I immediately smashed the ZL1 1LE record at that track (it's something like a 1:14.5), even in poor conditions with limited experience.

The tire / weigh ratio is much better on the NC: 255 / 2150# vs. 300 / 3200#. It also has more aggressive camber, though the C6Z has solid bushings so that may be a wash.

[Hurljohn]

That just looks like good fun!  

[Bandit]

5 hours ago, Grant said:

The C6Z is on Supercar 3Rs,

I've been trying to find some info on these concerning wear without much success. The vast majority talk about how many weekends they get which doesn't help much. Do you think they are a viable endurance tire? Meaning making a full 8 hour race at a minimum. Ideally a weekend.

 

They have some nice sizes for big car guys.

 

Ah, my bad. I missed the R. I doubt those will last. Was looking at the standard Supercar3, Any experience with those?

[turbogrill]

20 hours ago, Grant said:

Good catch, yes and I haven't gotten a 100% C6Z dry lap yet (though I think the hairpin was). That surprised the hell out of me, as well as T1 speeds. The C6Z is on Supercar 3Rs, which I guess are a much better tire than Cooper RS3-Rs. Those are the tires GM put on the ZL1 1LE to get it such great lap times. On a C6Z I immediately smashed the ZL1 1LE record at that track (it's something like a 1:14.5), even in poor conditions with limited experience.

The tire / weigh ratio is much better on the NC: 255 / 2150# vs. 300 / 3200#. It also has more aggressive camber, though the C6Z has solid bushings so that may be a wash.

 

1. Why not solid bushings on the NC and a little less camber? 

 

2. Is the 2150lbs with driver as raced?

[Grant]

On 8/19/2021 at 4:04 PM, Bandit said:

Ah, my bad. I missed the R. I doubt those will last. Was looking at the standard Supercar3, Any experience with those?

 

I have no direct experience but I know they are quick. If they came in a 255/40-17 they'd be on the top of my list to try. Unfortunately the only 17" size they're available in is 245/45-17. Based on what others tell me I think they'd last at least 8 hours, and I hear they are quicker than RS4s.

 

On 8/20/2021 at 6:57 AM, turbogrill said:

1. Why not solid bushings on the NC and a little less camber? 

 

2. Is the 2150lbs with driver as raced?

 

1. The NC would need spherical bearings in every control arm except the front upper, which could be Delrin. That's all extra points in ChampCar.

 

2. Yes

[Grant]

I actually ended up running 1:11.8 in the dry, so with a bit of water and overabundance of caution it slows down 21 seconds.

 

Only one other track day car has made it into the 1:11s, so I think I'll take the record if I can be bothered to put a wing on the car. The current lip spoiler is glued and bolted on, so it'd mean replacing the rear fascia. Or maybe all it would take is cooler weather and more practice; ABS failure meant I only got three hot laps in. The data suggests there's a half second in driving improvements and running over the esses.

The NASA TT1 guys I compete against here were running 1:13s with aero and Hoosiers. In cooler weather they do 12s. Maybe I should try some NASA events

 

Here's an absolutely awful video for anyone interested:

 

Edited September 13, 2021 by Grant