Thanks Lou!
Low 8's are no joke with a slant six.

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Hyper_pak

Is it possible there was something on the track that caused a lack of traction on the right? You don't have 32# of air on that side do you!

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I think it was prepped.
18 in the Left, 20 in the right slick.
If you look at the hook, it hooked.
Then it drove right, you can see the tire tracks.
I will take some of the blame, my head is a ways from the head rest.
I was not expecting the hook and it took me a bit to react.
But I was expecting it to go kinda straight.
But with no bog it just went.

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Hyper_pak

I will hit the 7s in a street-driven Slant car before I am done, with boost of course so you can call me a cheater...

Keep on it. I remember clearly watching Charles Myers car take a hard turn about 40 ft out. Scared everyone, especially him. Might be worth calling him to see if he remembers how/if they fixed it. Bet he would be excited about your car!

Lou

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Home of Slant6-powered fun machines since 1988

You guys are making me feel good, about getting some 7.9's wth my 66 Valiant (yeah N2O), but a totally low dollar build.
Back to our previously scheduled program.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

We are keeping the flame burning.

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Hyper_pak

Why the difference? Setting stagger for the turnoff?

You may want to watch it in slow motion, it never hooked. Both left side and the right front were off the ground at one time or another.

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Official Cookie and Mater Tormentor.

How could it lift the front tire if the tire didn't bite?
The stagger was from last year to get the right pull out.
I didn't expect all hell to brake loose.

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Hyper_pak

If the left rear was off the ground, then that would cause a hard veer. That could be leaving the ground because a shock/stop reached the end of its travel (on extension). IIRC, this was the issue with Seymour's racecar ("hoppy"), that the Covalts fixed, and I have seen several other cars with shock travel (hitting stop) issues that were severe and caused "ugly things." I think this is more prevalent than people realize, and should be checked carefully on any modified car.

Lou

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Home of Slant6-powered fun machines since 1988

Lou, regarding in Stan's situation, is your thought concerning bottoming on compression of the rear shock?

Or is it hitting the shock's stop on full extension?


I understand that generally limiting the suspension motion by hitting the stops too much can cause goofy things, I am just trying to visualize this.


Thanks,

Greg

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http://www.youtube.com/hyperpack

Extension is what I'm thinking, but it could be either. If the car hits the tires hard, it might bounce upward (off the air/rubber in the tires) and then hit the extension stop, and then lift the tire off the ground. I think this is what was happening with Seymour's racecar. I guess if it hit the compression stop hard then that might bounce the car upward more violently and then lift the tire? It would seem it would then have to (1) hit the extension stop too or (2) overcome the movement rate allowed by the shock in order to lift the tire off the ground.

Personally, I am going to get more serious and careful about measuring shock travel, stops/lengths on either end, and the "ride height" or the shock length where it typically rides. With a lowered car with stock shocks, or with any aftermarket shocks, these things could become important. I just did this on the rear of the 34 Coupe and it rides quite near to the middle of the travel (16.8") and the stops are 13.1" and 20.7".

Lou

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Home of Slant6-powered fun machines since 1988

That is quite a bit more than most people run in slicks isn't it? But if the left rear unloaded and lost traction, the right slick should have driven the car to the left, correct? His car went hard Right? Something seems funky here to me. Seymour's car was running slicks with less than 10 # pressure if I remember correctly. It would hit so hard off the transbrake (@ 4500rpm) that it would crush the tires down, then they would rebound and actually lift the rear tires completely off the ground. This is a leaf spring car also. The fix was another long leaf added to the spring pack, mounted upside down and I think he got a new set of adjustable shocks that he could slow down the rear ends motion when the car left. These items worked and the car went 11.00 in 1/4 & 6.91 in 1/8. He also switched to large radial tires because the car swayed so much at 117 mph.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Lots of good and not so good in the video.
I do see a bounce up on the left, off the ground?

I had made adjustments to the rear shock over the winter.
I changed both bound and rebound settings.
I also measured the compressed height and according to one chassis guy I am to far out from the center of the shock.
I can get it more centered by lowering my spring rate. (Which I do not currently know).
When I get the trans out I will measure the suspension drop before the shock bottoms.

I was playing with tire pressures earlier trying to get off the line.
That is how I got to the 20 lbs. number.
I have a 12 inch tire contact patch at lower pressures, around 15 lbs.

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Hyper_pak

Here is the last video from Xtreme.
This is when the trans broke.
Looking at it I do see the little/large left wheel hop.
Dennis might have seen something I didn't.
We had lowered the 2-step to 4500 here.
Not sure why it's rolling, clutch stop might be too high.
I don't have a lot of experience with a diaphragm clutch, do they lock as RPM comes up?
60 foot time on this run was 1.87 vs 1.76 on first pass.
1 somethings are better than 2 anythings.
I was much more ready this time for the launch, but still went a little right.

https://www.youtube.com/watch?v=jhfiuwXL8tk

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Hyper_pak

The left shock might have reached it's full extension limit.
I could see that.
I am going to remove the coil over and put it in a press with a valve spring checker I have.
Then I will know what spring rate I have.

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Hyper_pak