A few slow-motion launches

February 29, 2020, 10:50 AM

BP758

Yes , Turbo Pro Trans. It’s prob a dime quicker than the 400. 3620# I’m pretty happy. Stock is not for everyone. I love to tune and not just the motor. I’m a bracket racer but I’m also a performance guy. Cars eat up efficiency and it’s a challenge to find it.

This message has been edited. Last edited by: BP758,

March 01, 2020, 04:28 PM

Mike Rietow

quote:
Originally posted by AlkyIROC:
This was mine many, many years ago.

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

Look'n good.

March 02, 2020, 06:00 AM

<DOTracer>

I have a mount fabricated under my car for a GoPro. I will use it from time to time to aid chassis tuning.

8.50 (1/4) car, 60' usually 1.18 to 1.19.

https://youtu.be/Pl2QHPxsMog

Very simple and effective as you can really see alot of whats going on if you pay attention. Can even see the left front tire and what it's doing in relation to the back.

This season the car is getting shock sensors to correlate to the video, time slip, etc.

Outside view.

https://youtu.be/vojLYC1ak18

March 02, 2020, 05:10 PM

Bad Nusz

quote:
Originally posted by DOTracer:
I have a mount fabricated under my car for a GoPro. I will use it from time to time to aid chassis tuning.

8.50 (1/4) car, 60' usually 1.18 to 1.19.

https://youtu.be/Pl2QHPxsMog

Very cool. Man, that ride just leaves!

I'll try that with the camera underneath; my buddies are too busy with their own things to tape my launches. I may try to rig up some sort of scale with a pointer so I can better see how the suspension moves in relation to the frame.

Very simple and effective as you can really see alot of whats going on if you pay attention. Can even see the left front tire and what it's doing in relation to the back.

This season the car is getting shock sensors to correlate to the video, time slip, etc.

Outside view.

https://youtu.be/vojLYC1ak18

Very cool. Man, that ride just leaves!

I'll try that with the camera underneath; my buddies are too busy with their own things to tape my launches. I may try to rig up some sort of scale with a pointer so I can better see how the suspension moves in relation to the frame.

March 03, 2020, 12:57 PM

Bad Nusz

quote:
Originally posted by Mike Rietow:
Geesh, you're not exaggerating! Imagine that tire when you take it off the rim, it'll fold up like an accordion, the size of a wallet!

Guys,other than I reckon premature wear of the sidewalls, does 'crushing' the tire like that also cause the contact patch to distort some, keeping the the tire face from pressing down evenly?

March 03, 2020, 04:36 PM

Bad Nusz

quote:
Originally posted by CURTIS REED:
Looks like that Dart in the second video could use some more air. That thing was crushing the tire.

Also BN, bear in mind that those Mopars really separate on the launch.

Thanks, Curtis.
Can you or anyone explain to me why it is that those Mopars separate so much on the launch? Is it for the leaf spring being shorter and/or stiffer between the axle and front spring eye, than other springs?

March 04, 2020, 06:36 AM

CURTIS REED

quote:
Originally posted by Bad Nusz:
quote:
Originally posted by CURTIS REED:
Looks like that Dart in the second video could use some more air. That thing was crushing the tire.

Also BN, bear in mind that those Mopars really separate on the launch.

Thanks, Curtis.
Can you or anyone explain to me why it is that those Mopars separate so much on the launch? Is it for the leaf spring being shorter and/or stiffer between the axle and front spring eye, than other springs?

BN, I've never messed with a Mopar personally but if I were to hazard a guess it is because the mounting points of the suspension are set up in a way to have a lot of anti squat. I believe most of them us a pinion snubber that possibly contributes by pushing up on the chassis. Sorry I don't have a better or more specific answer.

Curtis

March 04, 2020, 11:23 AM

Bad Nusz

quote:
Originally posted by CURTIS REED:
quote:
Originally posted by Bad Nusz:

Thanks, Curtis.
Can you or anyone explain to me why it is that those Mopars separate so much on the launch? Is it for the leaf spring being shorter and/or stiffer between the axle and front spring eye, than other springs?

BN, I've never messed with a Mopar personally but if I were to hazard a guess it is because the mounting points of the suspension are set up in a way to have a lot of anti squat. I believe most of them us a pinion snubber that possibly contributes by pushing up on the chassis. Sorry I don't have a better or more specific answer.

Curtis

That's okay, Curtis; thank you anyway. If the pinion snubber works the way I envision, then I can see how it could give the differential housing something to pry against to push down from the chassis.