HOME MAGAZINE FORUM RULES SPONSORS CONTACT
     
   
   
Go Back   CLASS RACER FORUM > Class Racer Forums > .90 Heads Up Class Racing Tech

Reply
 
Thread Tools Display Modes
Old 02-04-2020, 09:37 AM   #11
NHRA1926
Junior Member
 
Join Date: Dec 2015
Posts: 43
Likes: 0
Liked 2 Times in 2 Posts
Default Re: Stock and Super Street....

What are some ways to reduce reaction times with a "Stock" style suspension set up to hit a pro tree (.470) in Super Street. My set up is a lot like Marty's Camaro. 67 Camaro big block, 3600 lbs, 30x10.5 Pro Bracket Radials, caltracs bars and leaf springs, moroso trick springs up front, afco double adjustable shocks all around. I've set the front shocks to stiffest rebound setting, and installed travel limiters on the upper control arms, 26" tall front runners. Even when rolling WAY into the bottom stage bulb, I can only be .030-.050 on the .470 tree. Obviously, there is no consistency when staging like this. I do not use a delay box for obvious reasons, can't hit the tree without one, so why have it. It even has a 2.75 low gear set in the tranny, 4.30 gears and two step is set at 3,000 rpm. I've tried a higher rpm launch, but it spins the tires more often with higher rpm launch. Any ideas would be appreciated.
NHRA1926 is offline   Reply With Quote
Liked
Old 02-04-2020, 11:44 AM   #12
Lenny5160
Senior Member
 
Lenny5160's Avatar
 
Join Date: Nov 2015
Location: Inver Grove Heights, MN
Posts: 594
Likes: 171
Liked 143 Times in 83 Posts
Default Re: Stock and Super Street....

In theory your car should be able to react much quicker than mine, but you're nearly .100 behind what I'm getting staged dead shallow.

I wonder if it would be quicker if you reset the front shocks and travel to allow the car to work at a higher RPM.

A pro-tree transbrake? A quicker button?
__________________
Tony Leonard
S/ST 5160
S/C 5160
Lenny5160 is offline   Reply With Quote
Old 02-04-2020, 02:05 PM   #13
Hacksaw
Senior Member
 
Join Date: Sep 2016
Posts: 620
Likes: 40
Liked 86 Times in 53 Posts
Default Re: Stock and Super Street....

Converter change.
Hacksaw is offline   Reply With Quote
Old 02-04-2020, 06:20 PM   #14
NHRA1926
Junior Member
 
Join Date: Dec 2015
Posts: 43
Likes: 0
Liked 2 Times in 2 Posts
Default Re: Stock and Super Street....

When I remove the travel limiters and set the front shocks at full loose extension, it slows down my reaction time and wheel stands pretty high (2-3 feet). I have a lot of travel in the front, I believe that's why my reaction is slower when it's loosened up. I'm using 25" front tires also, thought they were 26". I have a converter built specifically for my set up by Lenny at Ultimate Converter Concepts,so I really don't believe the converter is the problem. I do not have a pro trans-brake, it is a TCI, but not the pro style. I might try a higher rpm on the two step, but again, it spins sometimes. Especially with the front end tied down and travel limiters installed.
NHRA1926 is offline   Reply With Quote
Old 02-05-2020, 07:13 AM   #15
SGSST109E
Member
 
Join Date: Jun 2007
Location: NJ
Posts: 187
Likes: 5
Liked 13 Times in 7 Posts
Default Re: Stock and Super Street....

Leave the front shocks loose and start to tighten down the travel.
SGSST109E is offline   Reply With Quote
Liked
Old 02-05-2020, 09:24 AM   #16
Tom Goldman
VIP Member
 
Tom Goldman's Avatar
 
Join Date: Jan 2003
Location: Allentown,PA
Posts: 2,206
Likes: 213
Liked 175 Times in 57 Posts
Default Re: Stock and Super Street....

Quote:
Originally Posted by NHRA1926 View Post
When I remove the travel limiters and set the front shocks at full loose extension, it slows down my reaction time and wheel stands pretty high (2-3 feet). I have a lot of travel in the front, I believe that's why my reaction is slower when it's loosened up. I'm using 25" front tires also, thought they were 26". I have a converter built specifically for my set up by Lenny at Ultimate Converter Concepts,so I really don't believe the converter is the problem. I do not have a pro trans-brake, it is a TCI, but not the pro style. I might try a higher rpm on the two step, but again, it spins sometimes. Especially with the front end tied down and travel limiters installed.
There is much to be gained in the trans brake area . the bracket style brakes are SLOW ,they can be as much as .030 slower than a pro tree brake .
Select Performance has one of the quickest Powerglide brakes for Pro Tree racing.

I would set the front shocks loose with about 2-3" travel as mentioned before , but I would switch to a stiff wall bias slick and raise the launch rpm substantially .
Radials are great for going fast ,but when you are chasing Pro Tree R.T. ,and you want to limit travel ,you are better off with the bias ply .
For the rear suspension ,I'd have the front of the Cal Trac in the upper hole .
Rear shock settings need to be tried at a test and tune for both RT and 60' consistency, but stiffer is usually better.
__________________
Tom Goldman 1500 SG , 1506 STK
Tom Goldman is offline   Reply With Quote
Liked
Old 02-07-2020, 05:55 PM   #17
Rich Biebel
VIP Member
 
Rich Biebel's Avatar
 
Join Date: Jun 2007
Location: Northern New Jersey suburbs
Posts: 2,097
Likes: 16
Liked 210 Times in 106 Posts
Default Re: Stock and Super Street....

Many years ago when I first tried using a trans brake I had a TCI brake and it was ridiculously slow. I could literally feel the amount of time from when I let the button go to when the car launched....

I had a trans done by someone and gave him all my parts. Told him specifically do not use that TCI valve body, he did anyway. After wasting time with that one, it was changed out and RT's were more in line with normal.....

A Pro Tree VB is usually quicker than a std brake but that's not written in stone......I had one std brake trans that was very fast.....I used to have a ton of delay using that trans....and more than one would expect.....but the Pro tree brakes are definitely usually quicker and by a decent amount as Tom said....
__________________
Rich Biebel
S/C 1479
Rich Biebel is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:36 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.Ad Management plugin by RedTyger