Black Jack: Working up to slicks

After skipping a year, I went to my first autocross, today. I placed 4th of 5 in CAM-T, just ahead of a Van, lol. It was my least competitive day, to date, but it really isn't about competition to me. I just enjoy driving the car.

This go-round, there were more cars than I'd ever seen, and we only got 4 runs in. So, I never got comfortable, and I never ran the course right. Due to that, I really never got a good feel for the car. So, really didn't make many adjustments. As down as that all reads, I'm sure, I really did enjoy putting ol' Jack through its paces, today.
 
After skipping a year, I went to my first autocross, today. I placed 4th of 5 in CAM-T, just ahead of a Van, lol. It was my least competitive day, to date, but it really isn't about competition to me. I just enjoy driving the car.

This go-round, there were more cars than I'd ever seen, and we only got 4 runs in. So, I never got comfortable, and I never ran the course right. Due to that, I really never got a good feel for the car. So, really didn't make many adjustments. As down as that all reads, I'm sure, I really did enjoy putting ol' Jack through its paces, today.
It was great seeing you and Black Jack back at an autocross event. You drove extremely well for your first event in a long time. It was a tricky course, and there wasn't much grip out there because of the weather. I'm sorry I didn't get a chance to jump into the car with you. We had a lot of novices the day after Novice School, and I couldn't get over to you during our run group. You held your own against some fast competition. Nice driving! Hopefully, you'll get to come to more events this season.
 
OCI:
94.8k: Oil change (Mobil 1 0W-40) in preparation for a 1.2k round trip to Fort Knox, this week, for work.

Corbeau fixt & reinstalled:
Also, I got the Corbeau GTS II back from the furniture shop with better padding in the knee bolster area, and Ahail also shaved 3/4 of an inch of material from the seat bottom. I installed and drove it around for 3-4 days, and it really made a big difference in seating position, and with the stiffler's low profile brack finally feels like I'm low enough for the first time since the stock seats. The knee bolster padding with these seats just pushes your legs too close together for clutch work during regular driving. Still want the Recaro LX style seats one day, but these will work until I get the house paid off.

Getting froggy on the dragstrip:
I'd like to find a rear 5-lug 15-16" wheel that will fit a slick in Black Jack's stock rear tubs. Thinking that since a 275 is already back there, a 26x10 slick might work. Sound right to you folks? If so, then I think a 9" or 10" wheel with the standard 6"-6.5" BS would work right. Need to reinforce the upper and lower torque boxes, install a D/S safety loop, and weld up the rear axle tubes while I'm at it.

Radiator repair needed:
The Ron Davis has developed a slow leak that I attribute to too rigidly bolting it in. I'm gonna take it to a guy in Charlotte who fixes 'em, but want to find a cheapo on bookface to carry me for a few weeks while the Ron Davis is repaired.
 
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I'm going to a 6-week school at Fort Lee and it's only about 3 hours away. I left last Sunday, stayed there for a week and returned today. 412 MI and 14.3 gallons used on this tank of gas. That works out to 28.8 miles per gallon, which is a new best. Now, I did deliberately took it easy, but I used plenty of air conditioning and even took an excursion into town one night for trivia at a bar with the other students. I will definitely hit my 30 mpg goal, one day. Just need a day where it's not over 85°, and I'm not in a hurry.
 
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Back from school:
I'm back from what  should be my last for-credit academic environment in the Army, and hopefully ever. If I never see the inside of a classroom again, it'll be too soon. Anyways, I traveled back & forth on the 400-mile round trip 4 times, and other than a minor coolant leak that forced me to top off the radiator once, Black Jack had no issues.

Wanna go fast, need stickier tires:
I've got a hankerin' to get Black Jack strip-ready, and so I've got some parts a welding fox-enthusiast near me will install, soon:
- Wild rides upper and lower "battle box" torque box reinforcements
- relocate my WBO2 sensors, which currently interfere with
- installing my stiffler's D/S safety loop

After that, I think Black Jack is ready to really take abuse. Subframe connectors, check. 31-Spline truetrac, check. Should I think about welding or reinforcing the 8.8 housing?

Picked these up today for $375. 15x10, 6.5" BS. Ain't pretty, but should fit after a little banjo bolt clearancing. I've heard stiff wall slicks are best for Manual Transmissions. True?

IMG-20260702-WA0003.webp
 
I'm back from what  should be my last for-credit academic environment in the Army, and hopefully ever.

I traveled back & forth on the 400-mile round trip 4 times, and other than a minor coolant leak that forced me to top off the radiator once, Black Jack had no issues.
Congrats to both you and Black Jack. Your academic accomplishment and Black Jacks performance! Good stuff all around!
 
15x10 weld, 6.5" bs, MT et drag 26x10x15. If you were closer, I have a set of the slicks sitting here I used on the Grench.
M/T recommends a stiff wall slick for stick cars, heavier cars, and high powered cars. That's what I got for Father Time, because it'll make 1100 rwhp. On Black Jack, I'm actually thinking soft sidewall is the way to go. Black Jack may eventually push 500 rwhp, but right now it's making well less than 400rwhp. And its starting line ratio is very tall; 2.66 * 3.73 = 9.92.

That tall, I think winding the RPM way up and very aggressively releasing or even dumping the clutch is preferred. Soft walls absorb shock, and recover better from hazing/spin. Plus, the softwall is a true 15x26, whereas the stiff wall is 15x26 but has a reported OD of 26.5". So, the shorter tire is slightly better gearing in my application.

Thoughts?

Softwall: