Radial Testing Tires Moving and - Chevelle Tech
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post #1 of 37 (permalink) Old Jun 28th, 20, 11:40 AM Thread Starter
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Jarad
 
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Radial Testing Tires Moving and

I made a few rear suspension changes over the winter. Also did some wiring clean up and a race column. Recording some data now as well. Hoosier DBR 28x10.5's at 16PSI. Recommended by the manufacturer to start with.


Some observations. The Chevelle will be quicker with the changes.The radials are moving. I believe the car is out of pump, at least I feel like it is laying over and breaking up at the top is a fueling issue? Did have a new best 60' and 330'.


The Fuel Pump is a Quick Fuel 230 GPH @ 7PSI. Probably need to go with race pump like the MagnaFuel 4601? Open to suggestions?


DA for the day 2,500 to 3,000". 85* and a little humid. Really nice day for some testing.


TNT night and busy with Street Cars and Some Fast Hotrods.


Spun on this pass. 3,800 on the 2 Step. I've watched it in slow motion a few times. From the audio, it seems to spin after the hit with the front tires up. Feel like this burnout was light. Might have been the reason combined with the higher RPM leave.

https://youtu.be/mcc3bx62x_E


Getting used to the new Tachometer. Shifted way late on this. 7,500. Car MPH's best at 6,800 low to high. This is the best 60' and 330' the car has ever been. It also ties the best ET. It was 5 MPH off from the previous best of 2019, late shift and breaking up also got out of throttle early. The car with slicks would pick up numbers in the 60' as the 2 step is increased. I feel it will go into the 1.2's with tuning.


1.31/3.75/5.87, 3,600 on the 2 Step.

https://youtu.be/aE8X5eZdg2c

First pass of 2020. 3,300 on the 2 Step. Shift was 7,300 I believe on this. Also breaking up a little.

https://youtu.be/8GA_WgqIADA


This is how much both tires move, 2 passes. Both sides about the same. I did Hi Tack the beads. Should I bite the bullet and go to beadlocks? Seems like excessive moving? I feel it's a safety issue.





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72 Slovelle
555 Pump Gas BBC
Best so far:
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post #2 of 37 (permalink) Old Jun 28th, 20, 12:10 PM
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jeff
 
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Re: Radial Testing Tires Moving and

Sometimes the rim is too slick, bead blast the rim if you have not done that and retry.
You may even find a place to Knurl the bead seat.


I think these guys do that. About 40 per wheel

https://finspeed.com/
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post #3 of 37 (permalink) Old Jun 28th, 20, 12:16 PM
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Bill
 
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Re: Radial Testing Tires Moving and

Why not just put screws in the existing holes?
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post #4 of 37 (permalink) Old Jun 28th, 20, 12:25 PM Thread Starter
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Jarad
 
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Quote:
Originally Posted by jeff swisher View Post
Sometimes the rim is too slick, bead blast the rim if you have not done that and retry.
You may even find a place to Knurl the bead seat.


I think these guys do that. About 40 per wheel

https://finspeed.com/
I've considered doing something like that. I'll probably try that before I move to beadlocks. Not really wanting to spend the money on them right now.
Quote:
Originally Posted by 69SS454 View Post
Why not just put screws in the existing holes?
Radials aren't supposed to be screwed. It could cause the tire to fail from what I've read. M/T and Hoosier both warn against.
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555 Pump Gas BBC
Best so far:
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post #5 of 37 (permalink) Old Jun 30th, 20, 8:24 AM
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Re: Radial Testing Tires Moving and

How far have the tires moved on the rim? I would give it a little longer and see if they take a set.

Ray

Best pass 8.87 at 150.98 1.212 60'. Sold 3/2018

1970 SS 396 project in progress. Bought 5/2018
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post #6 of 37 (permalink) Old Jun 30th, 20, 9:20 AM Thread Starter
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Quote:
Originally Posted by bracketchev1221 View Post
How far have the tires moved on the rim? I would give it a little longer and see if they take a set.
Drivers side about 2" a pass, passenger about 1.5". I let them seat for a couple months.

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Best so far:
5.87-118.52 MPH
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post #7 of 37 (permalink) Old Jun 30th, 20, 10:43 AM
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Greg.
 
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Re: Radial Testing Tires Moving and

If I am see right the White mark on the Wheel's Rim VS the White Mark on the Tire looks to be about 6"

Not good IMHO

I had M&H Bias Tires on Chrome Wheels NO Tubes/NO Screws and even when Launching at the Track
with only 13 lbs of Air in them they would Wrinkle real good and never moved on the Rim


67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #8 of 37 (permalink) Old Jun 30th, 20, 10:43 AM
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Kerry
 
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Re: Radial Testing Tires Moving and

I would say the front end came up a bit too fast.

Where is your regulator mounted? Post a pic of your fuel system under the hood. Also what size lines from tank to the carb?
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post #9 of 37 (permalink) Old Jun 30th, 20, 10:55 AM
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Greg.
 
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Re: Radial Testing Tires Moving and

On the First Video above I think the Frontend came down to quick/Soon

2nd and 3rd Video looked okay

You seem to get good Grip on Launch, however if those Tires are moving that much,
instead of Spinning, then you need to address it ASAP
could also be the Reason why the Loose end later down the Track in the 3rd video

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #10 of 37 (permalink) Old Jun 30th, 20, 11:19 AM
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Greg.
 
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Re: Radial Testing Tires Moving and

Previously ran a Mech Edelbrock # 1722 = Hi Vol 110gph - 3/8” NPT inlet/outlet - 6 psi - no regulator needed
and ran 60' = 1.664 et // 1/8 = 7.532 et / 91 mph // 1/4 = 11.814 et / 115 mph
that was with the Original Leaking Gas Tank and only a 2,500 Stall Converter

Carb = 950cfm Holley Pro Systems with a 1" Spacer under it
Intake = Weiand Stealth Hi Rise Dual Plane

Put a new Fuel Tank/Holley EFI Sniper Fuel Tank + Russell Braided -6 AN Hose Fuel Lines (Feed & Return) and a Regulator

Changed out the Fuel Pump that came with the Holley Tank for a Aeromotive 340 lph Fuel Pump

And ran these #s
60' = 1.547 // 1/8 = 7.311 et / 91.76 mph // 1/4 = 11.595 et / 114.28 mph
with a new 3,500+ Stall Converter

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #11 of 37 (permalink) Old Jun 30th, 20, 11:28 AM Thread Starter
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Jarad
 
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Re: Radial Testing Tires Moving and

Quote:
Originally Posted by Kirk's67SS View Post
If I am see right the White mark on the Wheel's Rim VS the White Mark on the Tire looks to be about 6"

Not good IMHO

I had M&H Bias Tires on Chrome Wheels NO Tubes/NO Screws and even when Launching at the Track
with only 13 lbs of Air in them they would Wrinkle real good and never moved on the Rim


That mark has a couple passes. 1.5"-2"'s a pass...


Quote:
Originally Posted by pockets View Post
I would say the front end came up a bit too fast.

Where is your regulator mounted? Post a pic of your fuel system under the hood. Also what size lines from tank to the carb?
-10 Feed and Return. Fuel Log to the -6 feeding the carbs.





Quote:
Originally Posted by Kirk's67SS View Post
On the First Video above I think the Frontend came down to quick/Soon

2nd and 3rd Video looked okay

You seem to get good Grip on Launch, however if those Tires are moving that much,
instead of Spinning, then you need to address it ASAP
could also be the Reason why the Loose end later down the Track in the 3rd video

From listening to the audio, I believe it spun with the front up, reason if fell so fast.

It does seem to grab well.

I'm not going back without at least messing with the bead again, it's a big safety concern of mine. I might do something like Jeff said earlier. I really do not want to go to bead-locks, I believe that will slow the car down. Screwing Radials also looks to be dangerous, so not going that option either

Also broke up every pass. My feeling is fuel, it only did it in high maybe 450'-500' out.
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72 Slovelle
555 Pump Gas BBC
Best so far:
5.87-118.52 MPH
JBoggs is online now  
post #12 of 37 (permalink) Old Jun 30th, 20, 11:52 AM
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Greg.
 
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Re: Radial Testing Tires Moving and

Yes with 2 Big Carbs you will need something that can Feed them for sure

And I also would worry about the Tires moving that much of 1.5" to 2" per Pass
as at some point they could just lose all their Air at the wrong Time and the end result would likely not be good

My car is a Street car that I drive up to the Track and back again on the same type of Street Tires I run at the Track
happy with the Results and do not plan on running Slicks as they tend to break things to much IMHO

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #13 of 37 (permalink) Old Jun 30th, 20, 2:25 PM
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Re: Radial Testing Tires Moving and

Quote:
Originally Posted by JBoggs View Post
Drivers side about 2" a pass, passenger about 1.5". I let them seat for a couple months.
No not like that. Let them work into the rim. Radials tend to spin and then bite into the bead and stay. Just sitting is not going to make them seat. I think I’d give it one more shot before breaking them down. As far as fuel I find it odd that yours is breaking up before half track. What is the fuel pressure gauge saying? What rpm do you cross the stripe in the 1/8?

Ray

Best pass 8.87 at 150.98 1.212 60'. Sold 3/2018

1970 SS 396 project in progress. Bought 5/2018
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post #14 of 37 (permalink) Old Jun 30th, 20, 2:40 PM
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Bill
 
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Re: Radial Testing Tires Moving and

What size tire and rim width? Hard to tell in the video but almost looks like the tread is wider than the rim. Is your fuel pressure consistent thru the run?

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post #15 of 37 (permalink) Old Jun 30th, 20, 3:39 PM
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Dale
 
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Re: Radial Testing Tires Moving and

This pic is how much my radials rotated last year. My mark is at 8:30 and was lined up with the valve stem. A little over 1/4 revolution and I also did the hi-tack thing. Haven't heard of anyone blowing one of these tires off the seat yet, so not going to worry about it.
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