Want to slow car down - LS1TECH

Go Back   LS1TECH > RACING DEPARTMENT > Drag Racing Tech
Log In 
Search


Drag Racing Tech
Rules | Safety | Setups | Hardware | Methods
Sponsored by
Scoggin-Dickey Parts Center
Click Here


Want to slow car down

Reply
 
Thread Tools Search this Thread
Old 03-25-2012, 06:43 PM   #1
10 Second Club
 
Trader Rating: 11
Join Date: Oct 2010
Posts: 286
Default Want to slow car down

my car runs around 11.00's all day long but I dont have the money for a cage right now and I want to keep it around 11.50's. I shift the car @ 6800, im wondering if I short shift it if it would slow down to around 11.50's. Do you guys have any idea where I could shift it at to slow it down or do you guys know a differnt way to slow it down and still keep it consistant? There's a race this weekend that I want to run so any help would be appreciated.
__________________
1993 notch cam only 10.90@122, new setup 5.3 s480 turbo,
Rpayne41985 is offline   Reply With Quote
Old 03-25-2012, 07:59 PM   #2
9 Second Club
 
subhumanzz's Avatar
 
Trader Rating: 46
Join Date: May 2006
Location: Fredericksburg, VA
Posts: 1,029
Default

are you launching on a transbrake?
__________________
subhumanzz is offline   Reply With Quote
Old 03-25-2012, 09:39 PM   #3
TECH Fanatic
 
94Z28rag's Avatar
 
Trader Rating: 10
Join Date: Jun 2008
Location: West Chester, PA
Posts: 1,216
Default

You could add weight, but you'd need about 500 lbs to slow a half second, so that's not realistic.

Short shifting will help, but you'll just need to be consistent with the new shift points. You'll need a few runs to dial it in if you're making changes...but you could start but lowering your shifts to 6,000 and see how much it knocks off. If you need more, keep going lower.
__________________
'94 Z28 Convertible - 10.6 @ 127 MPH
DD: '14 Infiniti Q50S AWD
94Z28rag is offline   Reply With Quote
Old 03-25-2012, 10:02 PM   #4
On The Tree
 
Trader Rating: 0
Join Date: Feb 2006
Location: Oaktown, CA
Posts: 115
Default

Isn't this what bracket racers do? How do they do it? Throttle stop? Restrictor plate?
__________________
2002 M6 Z28 '02 Z06 Cam, Stock Exhaust, Spec 3, 4.11 Moser 12-Bolt, 12.44 @ 111.6, 1.727 60'
Hector is offline   Reply With Quote
Old 03-25-2012, 10:26 PM   #5
TECH Enthusiast
 
3DFORMULA's Avatar
 
Trader Rating: 4
Join Date: May 2007
Posts: 628
Default

Launch softer. Give up a couple tenths on the 60ft and shift lower like previously stated. More air in the tires will help you find a new softer launch. Get something consistent and you may get away with adding 100-150lbs only
__________________
94 Formula M6-AI 200cc, AI 228/234, Hurst, Spec 4, Moser 12bolt w/3.73, Midwest Chassis TA
3DFORMULA is offline   Reply With Quote
Old 03-26-2012, 09:37 AM   #6
Launching!
 
fatboyzcamaro's Avatar
 
Trader Rating: 7
Join Date: Sep 2008
Location: MARYLAND
Posts: 230
Default

Man u will b surprise how much u can slow down by short shifting. It works.
__________________
2000 Camaro-Nitous 408 iron block-Scorpion Tb-Super victor-T400 rmvb--3.70 MOSER 12 BOLT-8 POINT MILD STEEL CAGE-Hoosier 275 drag radial-Umi torque arm-Umi lca-3 way adjustable rear shocks-Qa1r 300 front shocks-
Induction Solution Fogger

Cam only 10.550-1.390-@125.38 SOLD
Best 1/8 6.56 103.00
Best 60 foot 1.383
fatboyzcamaro is offline   Reply With Quote
Old 03-26-2012, 10:30 AM   #7
9 Second Club
 
chasgiv3's Avatar
 
Trader Rating: 1
Join Date: Nov 2001
Location: Chicago
Posts: 783
Default

Install a 2 step on the car so you launch consistantly.
Is the TH350 a manual valve body? I assume it it. If so you need to experiment with a shift light at certain RPM's in order to get your number.
Then you can do 11.5's all day with consistancy. I can slow my car down via boost control if I'm in a situation that requires bracket racing and I launch off a very low RPM on the 2-step.
__________________
Street/Strip Car: Black 1999 WS6 Patriot Heads, Cam, LQ4 block with forged rotating assembly, Speed Inc. Custom Twin Turbo kit with Precision PT67 P-trim. Burkhart Chassis Chrome Moly Cage, Strange Engineering 12-bolt with 3.42 gears. 907RWHP, TH400 racing tranny with 4000 stall. Best 1/4 mile ET 9.19 @ 156.25 MPH on 15" Slicks ET 9.22 @144 MPH on 17" drag radials. New High Imp 160lb injectors 965RWHP getting ready for next season.
chasgiv3 is offline   Reply With Quote
Old 03-26-2012, 12:39 PM   #8
10 Second Club
 
TurboStangJON's Avatar
 
Trader Rating: 27
Join Date: Mar 2009
Location: Kissimmee, FL / Vienna, VA
Posts: 811
Send a message via Yahoo to TurboStangJON
Default

You can accomplish slowing the car down a variety of ways. I'd add some weight then lower the shift points.
__________________
FastForward Race Engines
TRZ Motorsports
Double AA Performance
VP Fuels
Neal Performance Innovations 1>2
TurboStangJON is offline   Reply With Quote
Old 03-26-2012, 01:06 PM   #9
10 Second Club
 
Trader Rating: 11
Join Date: Oct 2010
Posts: 286
Default

Im foot braking the car and it is a manual valve body
__________________
1993 notch cam only 10.90@122, new setup 5.3 s480 turbo,
Rpayne41985 is offline   Reply With Quote
Old 03-26-2012, 01:20 PM   #10
9 Second Club
 
chasgiv3's Avatar
 
Trader Rating: 1
Join Date: Nov 2001
Location: Chicago
Posts: 783
Default

Perfect. You should be able to foot brake it to say 2000RPM set your shift light to 5000RPM and make a test run. See where you're at and adjust the shift light RPM lower or higher by say 200RPM until you get the exact number that you wanted. The timing of your shifts need to be consistant with the light. This should get you there.
__________________
Street/Strip Car: Black 1999 WS6 Patriot Heads, Cam, LQ4 block with forged rotating assembly, Speed Inc. Custom Twin Turbo kit with Precision PT67 P-trim. Burkhart Chassis Chrome Moly Cage, Strange Engineering 12-bolt with 3.42 gears. 907RWHP, TH400 racing tranny with 4000 stall. Best 1/4 mile ET 9.19 @ 156.25 MPH on 15" Slicks ET 9.22 @144 MPH on 17" drag radials. New High Imp 160lb injectors 965RWHP getting ready for next season.
chasgiv3 is offline   Reply With Quote
Old 03-26-2012, 01:30 PM   #11
Internet Mechanic
 
BlackScreaminMachine's Avatar
 
Trader Rating: 17
Join Date: May 2005
Location: Wallingford CT
Posts: 9,841
Default

Like said many options, if iit has some timing in it, take it out. It would slow the car in all aspects so for those who street drive, add balast to where you want it. Just need to reference the car based on D/A and track condidtions if thats a concern.
__________________
2002 NBM Trans Am SOLD!

http://ls1tech.com/forums/vehicle-cl...l#post17273103
BlackScreaminMachine is offline   Reply With Quote
Old 04-02-2012, 11:29 PM   #12
TECH Resident
 
Big Al's Avatar
 
Trader Rating: 1
Join Date: May 2005
Posts: 973
Default

Put in a simple adjustable throttle stop. End of problem.

Al 95 Z28
Big Al is offline   Reply With Quote
Old 04-03-2012, 04:54 AM   #13
9 Second Club
 
subhumanzz's Avatar
 
Trader Rating: 46
Join Date: May 2006
Location: Fredericksburg, VA
Posts: 1,029
Default

I run in an index race once a month (6.50 index). My car runs high .20- low .30's and I pull about 6* of timing from 6-8k rpms pending on weather conditions and it will slow it down to a very low .50. This is the easiest thing to do if you have some tuning software. For me it was a plus because I didn't have to change my driving regimen at all.
subhumanzz is offline   Reply With Quote
Old 04-03-2012, 07:17 AM   #14
Internet Mechanic
 
BlackScreaminMachine's Avatar
 
Trader Rating: 17
Join Date: May 2005
Location: Wallingford CT
Posts: 9,841
Default

Quote:
Originally Posted by Big Al View Post
Put in a simple adjustable throttle stop. End of problem.

Al 95 Z28
Not all classes allow for that, or it puts them in "electronics" and you field with cars that are more apt to beat you. It all depends if your local track supports a "Foot-brake" class and a "Electronics" class
__________________
2002 NBM Trans Am SOLD!

http://ls1tech.com/forums/vehicle-cl...l#post17273103
BlackScreaminMachine is offline   Reply With Quote
Old 04-03-2012, 10:35 AM   #15
11 Second Club
 
TA1364's Avatar
 
Trader Rating: 11
Join Date: Aug 2007
Location: Dayton, OH
Posts: 1,780
Send a message via AIM to TA1364
Default

I'm in the same boat, need to slow down from 1150s to 1200s. Dont really want to pull a bunch of timming or add a bunch of weight then its a turd off the line. I was thinking of something to limit how far the the tb opens. Something like 80%-85%.
__________________
98 Formula-Sold
98 Trans Am-Sold
TA1364 is offline   Reply With Quote
Old 04-03-2012, 02:10 PM   #16
9 Second Club
 
subhumanzz's Avatar
 
Trader Rating: 46
Join Date: May 2006
Location: Fredericksburg, VA
Posts: 1,029
Default

Quote:
Originally Posted by TA1364 View Post
I'm in the same boat, need to slow down from 1150s to 1200s. Dont really want to pull a bunch of timming or add a bunch of weight then its a turd off the line. I was thinking of something to limit how far the the tb opens. Something like 80%-85%.
you dont pull the timing from the lower rpm range.
__________________
subhumanzz is offline   Reply With Quote
Old 04-03-2012, 05:34 PM   #17
12 Second Club
 
zracer323's Avatar
 
Trader Rating: 12
Join Date: Oct 2007
Location: Dayton, Ohio
Posts: 1,338
Default

I pulled 5 degrees of timing and added about 60 lbs of weight to slow mine down about .3 to run the 12.50 index at the Shootout last year.
zracer323 is offline   Reply With Quote
Old 04-05-2012, 07:02 PM   #18
TECH Resident
 
Big Al's Avatar
 
Trader Rating: 1
Join Date: May 2005
Posts: 973
Default

Quote:
Originally Posted by BlackScreaminMachine View Post
Not all classes allow for that, or it puts them in "electronics" and you field with cars that are more apt to beat you. It all depends if your local track supports a "Foot-brake" class and a "Electronics" class
What, they don't allow adjustable throttle linkage? Better show me that in a rule book. We use 1/4 28 rod and an adjustable coupling nut to make the linkage longer or shorter. We can slow down a full second and still stay consistent.

Al 95 Z28
Big Al is offline   Reply With Quote
Old 04-06-2012, 06:43 AM   #19
Internet Mechanic
 
BlackScreaminMachine's Avatar
 
Trader Rating: 17
Join Date: May 2005
Location: Wallingford CT
Posts: 9,841
Default

Quote:
Originally Posted by Big Al View Post
What, they don't allow adjustable throttle linkage? Better show me that in a rule book. We use 1/4 28 rod and an adjustable coupling nut to make the linkage longer or shorter. We can slow down a full second and still stay consistent.

Al 95 Z28
Like I said, may vary from track to track, and its class dependant. LVD used to post their rules and right now the site has not been updated for 2012.

http://www.yellowbullet.com/forum/sh...d.php?t=451426

Here is an example from MIR.

See post #12

Another one,

http://kansasdragway.com/racer-secti...racing-series/

I would think your fine as its not shutting the car down, more like restricting. I would think thats a good question for a track tech guy.
__________________
2002 NBM Trans Am SOLD!

http://ls1tech.com/forums/vehicle-cl...l#post17273103
BlackScreaminMachine is offline   Reply With Quote
Old 04-06-2012, 06:49 PM   #20
TECH Resident
 
Big Al's Avatar
 
Trader Rating: 1
Join Date: May 2005
Posts: 973
Default

Quote:
Originally Posted by BlackScreaminMachine View Post
Like I said, may vary from track to track, and its class dependant. LVD used to post their rules and right now the site has not been updated for 2012.

http://www.yellowbullet.com/forum/sh...d.php?t=451426

Here is an example from MIR.

See post #12

Another one,

http://kansasdragway.com/racer-secti...racing-series/

I would think your fine as its not shutting the car down, more like restricting. I would think thats a good question for a track tech guy.
Electronic limiters are a different story. You can weld a bolt under the gas pedal and use a coupling nut to adjust how far the pedal can go down. There are a lot of ways to do it.

Al 95 Z28 still trying to go faster
Big Al is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Auto tranny slowing car down xxx-zodiac Automatic Transmission 4 03-16-2015 05:08 PM
02 Z28 vs 13-14 5.bro unknown mods redbird555 Street Racing & Kill Stories 73 12-15-2014 08:02 PM
26x11.50x17 MT ET street on 17x11 anyone?? BAADGOAT Wheels & Tires 6 08-06-2013 02:41 PM
Downshifting with the Tap Shift gilroy222 LS4 Performance 10 06-12-2013 12:12 PM
Why is my car so SLOW?!! 468CH3V3LL3 Drag Racing Results 33 11-11-2010 02:13 PM


Tags
500, bracket, camaro, car, drag, lbs, low, ls1tech, motor, race, rpm, shift, slow, ss, tenths, weight


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 01:43 PM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details