DA shock adjustment

Ron Gusack · 06-17-2014, 12:18 PM

70 Nova, BBC, ladder bar, TH400, foot brake, Santhuff springs uncut, Strange DA's and Calvert 90/10's. Launch rpm is 2700 to 3000.

The tires spin about .3 into the run with an audible chirp. It doesn't do this every run. I've softened the extension to 0 on the left and 1 on the right. The compression is about in the middle on both shocks. My understanding is to stiffen the compression. Is the correct adjustment?

Thanks for any help.

MAURICE BLENDHEIM · 06-17-2014, 01:11 PM

Ron… Have you altered your ride height since the last time you posted with this problem? MB.

Ron Gusack · 06-17-2014, 01:44 PM

The back of the car is lower by about an inch, I think. I think the last time I asked for adjustment advice Jeff Lee helped but I wasn't clear about his thoughts on compression. I also may have been running a 9" tire then. This is with a 14" GY tire that is about 4 years old.

I might be able to post a video on youtube.

Mike Pearson · 06-17-2014, 04:50 PM

Cant expect much from 4 year old tires. There is more in front shocks than rear.

Ed Wright · 06-17-2014, 04:54 PM

Quote:

Originally Posted by Mike Pearson

Cant expect much from 4 year old tires. There is more in front shocks than rear.

^^^^^Just what i was thinking. Get some new Mickeys and work on the front.

Ron Gusack · 06-17-2014, 07:03 PM

The section width on these GY's just fit under the car. The local Hoosier guy will mount a tire just for measuring. I had to go to a 32x12" tire in Hoosier to get the same section width.

Eman · 06-20-2014, 04:33 PM

I always thought that a spin after launch was the etension being too loose

Ron Gusack · 06-20-2014, 11:01 PM

You might be right Eman and I'll probably try a little tighter on Sunday. I need tires and I can't decide on Hoosier 12" or MT 12W, which measures 13

MAURICE BLENDHEIM · 06-21-2014, 12:28 AM

Quote:

Originally Posted by Ron Gusack

70 Nova, BBC, ladder bar, TH400, foot brake, Santhuff springs uncut, Strange DA's and Calvert 90/10's. Launch rpm is 2700 to 3000.

The tires spin about .3 into the run with an audible chirp. It doesn't do this every run. I've softened the extension to 0 on the left and 1 on the right. The compression is about in the middle on both shocks. My understanding is to stiffen the compression. Is the correct adjustment?

Thanks for any help.

Ron...We tried to help you in your original post back in August 2012 with the same problem. Do you still have the same front springs (Santhruff uncut)? Like Ed said you need to make the front work and go with the new M/T's. Have you tried leaving at a higher RPM? MB.

Grant Eldridge · 06-21-2014, 03:41 AM

Ron, my 70 Nova BBC had Moroso front springs, 90/10 Lakewood front shocks, Koni dual adjustable rear shocks, 9" tire stocker. With mine, we set the extension very stiff at about 1-2 clicks from the stiffest setting and the compression at the mid point of adjustment. Car would launch at 3400 with 60' best of 1.41. My thought was to slow the extension of the shock as much as possible so the car could get out farther before the suspension reached full extension. We felt that if it reached full travel too quickly it could unhook the tires at that point, sounds like that could possibly be happening in your case,
just my 2 cents.....

Grant Eldridge
E/SA 6650

06-17-2014, 12:18 PM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	DA shock adjustment 70 Nova, BBC, ladder bar, TH400, foot brake, Santhuff springs uncut, Strange DA's and Calvert 90/10's. Launch rpm is 2700 to 3000. The tires spin about .3 into the run with an audible chirp. It doesn't do this every run. I've softened the extension to 0 on the left and 1 on the right. The compression is about in the middle on both shocks. My understanding is to stiffen the compression. Is the correct adjustment? Thanks for any help.

06-17-2014, 01:11 PM	#2
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 552 Likes: 271 Liked 228 Times in 78 Posts	Re: DA shock adjustment Ron… Have you altered your ride height since the last time you posted with this problem? MB.

06-17-2014, 01:44 PM	#3
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	Re: DA shock adjustment The back of the car is lower by about an inch, I think. I think the last time I asked for adjustment advice Jeff Lee helped but I wasn't clear about his thoughts on compression. I also may have been running a 9" tire then. This is with a 14" GY tire that is about 4 years old. I might be able to post a video on youtube.

06-17-2014, 04:50 PM	#4
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,325 Likes: 547 Liked 1,653 Times in 505 Posts	Re: DA shock adjustment Cant expect much from 4 year old tires. There is more in front shocks than rear. __________________ Mike Pearson 2485 SS

06-17-2014, 07:03 PM	#6
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	Re: DA shock adjustment The section width on these GY's just fit under the car. The local Hoosier guy will mount a tire just for measuring. I had to go to a 32x12" tire in Hoosier to get the same section width.

06-20-2014, 04:33 PM	#7
Eman Member Join Date: May 2014 Location: E TN Posts: 442 Likes: 14 Liked 106 Times in 61 Posts	Re: DA shock adjustment I always thought that a spin after launch was the etension being too loose

06-20-2014, 11:01 PM	#8
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	Re: DA shock adjustment You might be right Eman and I'll probably try a little tighter on Sunday. I need tires and I can't decide on Hoosier 12" or MT 12W, which measures 13

06-21-2014, 03:41 AM	#10
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: DA shock adjustment Ron, my 70 Nova BBC had Moroso front springs, 90/10 Lakewood front shocks, Koni dual adjustable rear shocks, 9" tire stocker. With mine, we set the extension very stiff at about 1-2 clicks from the stiffest setting and the compression at the mid point of adjustment. Car would launch at 3400 with 60' best of 1.41. My thought was to slow the extension of the shock as much as possible so the car could get out farther before the suspension reached full extension. We felt that if it reached full travel too quickly it could unhook the tires at that point, sounds like that could possibly be happening in your case, just my 2 cents..... Grant Eldridge E/SA 6650