Best way to launch with auto? - LS1TECH

Log In 


Best way to launch with auto?

Reply
 
Thread Tools Search this Thread
Old 05-11-2005, 10:40 PM   #1
10 Second Club
Thread Starter
iTrader: (9)
 
Join Date: Jun 2003
Location: Goshen, IN
Posts: 1,000
Question Best way to launch with auto?

I'm wondering what the state of the art is today. Back in the day, my B&M hydro with 3500 stall launched best nailing it from idle until I got it dyno tuned and lost it's throttle response. After that it launched best at 2800 or so, but not as good as before.

What is good today, say with a stock converter?
With a 3500 RPM stall converter?
With a 5500 RPM stall converter?
critter is offline   Reply With Quote
Old 05-12-2005, 07:24 AM   #2
DRAG RACING IS LIFE! Mod
iTrader: (5)
 
Villain281H's Avatar
 
Join Date: Nov 2001
Location: Gainesville, Florida # of drag strips runs: ?!?!?
Posts: 8,835
Default

I launch with my stock convertor between 900-1000. The Nova has a 3400 stall 10" convertor, and I launch between 1800-2000. You want to have some flash on the stall, but not have it so high it just pushes through the beams.

Derek
Villain281H is offline   Reply With Quote
Old 05-12-2005, 11:11 PM   #3
10 Second Club
Thread Starter
iTrader: (9)
 
Join Date: Jun 2003
Location: Goshen, IN
Posts: 1,000
Default

Quote:
Originally Posted by Villain281H
I launch with my stock convertor between 900-1000. The Nova has a 3400 stall 10" convertor, and I launch between 1800-2000. You want to have some flash on the stall, but not have it so high it just pushes through the beams.

Derek
Thanks for the reply. Sounds like you go a little more than half the stall speed with the loose converter?
critter is offline   Reply With Quote
Old 05-13-2005, 04:21 PM   #4
DRAG RACING IS LIFE! Mod
iTrader: (5)
 
Villain281H's Avatar
 
Join Date: Nov 2001
Location: Gainesville, Florida # of drag strips runs: ?!?!?
Posts: 8,835
Default

when footbraking it, that's about right. When/if transbraking it, go as close to the stall rpm if your suspension can handle it.

Derek
Villain281H is offline   Reply With Quote
Old 05-14-2005, 12:12 AM   #5
10 Second Club
Thread Starter
iTrader: (9)
 
Join Date: Jun 2003
Location: Goshen, IN
Posts: 1,000
Default

Quote:
Originally Posted by Villain281H
when footbraking it, that's about right. When/if transbraking it, go as close to the stall rpm if your suspension can handle it.

Derek
Thanks for the reply! This thread is getting looks, so somebody besides me must care

Any idea way you want to go higher with a trans brake? Is it because the locked transmission can hold it but the brakes won't? I guess that makes sense ... at some point sticky 10" slicks should be able to push skinny front tires right on through the lights.

Do you still get the flash effect running the engine that near stall? For that matter, is the flash effect useful for more than lifting the front wheels for a few feet?
critter is offline   Reply With Quote
Old 05-14-2005, 09:49 AM   #6
TWS
10 Second Club
iTrader: (63)
 
TWS's Avatar
 
Join Date: Mar 2003
Location: Austin, TX
Posts: 3,096
Default

Quote:
Originally Posted by critter
Thanks for the reply! This thread is getting looks, so somebody besides me must care

Any idea way you want to go higher with a trans brake? Is it because the locked transmission can hold it but the brakes won't? I guess that makes sense ... at some point sticky 10" slicks should be able to push skinny front tires right on through the lights.

Do you still get the flash effect running the engine that near stall? For that matter, is the flash effect useful for more than lifting the front wheels for a few feet?

Yes, the use of a transbrake allows you to bring the RPM up much higher than you would foot-braking it. You cannot bring a motor up to the converter's stall speed while holding it still at the tree just using the brakes. Well before the stall speed, the car will start to buck and then push your front tires through the beam and trip the lights.
TWS is offline   Reply With Quote
Old 05-14-2005, 10:58 AM   #7
TECH Fanatic
iTrader: (13)
 
NufNuffZ28's Avatar
 
Join Date: Mar 2004
Posts: 1,097
Default

I have best luck on 3200-3500 stalls launching from about 1100.

That lets teh converter do its job of flashing and getting you out of the hole!!


Best 60' is 1.50 in the Iroc with 3.73 gears and stock 10 bolt. Converter is a Coan 10'' 3200


Chris
NufNuffZ28 is offline   Reply With Quote
Old 05-15-2005, 03:56 PM   #8
10 Second Club
Thread Starter
iTrader: (9)
 
Join Date: Jun 2003
Location: Goshen, IN
Posts: 1,000
Default

Quote:
Originally Posted by NufNuffZ28
I have best luck on 3200-3500 stalls launching from about 1100.

That lets teh converter do its job of flashing and getting you out of the hole!!
That is pretty close to idle, just like I did with my B&M hydro back in the day
.
Quote:
Best 60' is 1.50 in the Iroc with 3.73 gears and stock 10 bolt. Converter is a Coan 10'' 3200

Chris
That is a good short time for 3.73 gears. I guess flashing must work.
critter is offline   Reply With Quote
Old 05-15-2005, 05:00 PM   #9
TECH Enthusiast
 
00Z28 Camaro's Avatar
 
Join Date: Dec 2004
Location: Palm Harbor,Tampa
Posts: 589
Default

Quote:
Originally Posted by NufNuffZ28
I have best luck on 3200-3500 stalls launching from about 1100.

That lets teh converter do its job of flashing and getting you out of the hole!!


Best 60' is 1.50 in the Iroc with 3.73 gears and stock 10 bolt. Converter is a Coan 10'' 3200


Chris

1.5 60' mother of god
00Z28 Camaro is offline   Reply With Quote
Old 05-15-2005, 10:30 PM   #10
DRAG RACING IS LIFE! Mod
iTrader: (5)
 
Villain281H's Avatar
 
Join Date: Nov 2001
Location: Gainesville, Florida # of drag strips runs: ?!?!?
Posts: 8,835
Default

I've tried mine between 1600 and 2000 rpm and the et's don't vary much, but the reaction time does, and since I bracket race the car, I'm concerned with that. the most I've ever gotten it to hold on the footbrake is 2500 rpm, but it was leaning HARD!

Derek
Villain281H is offline   Reply With Quote
Old 05-16-2005, 04:46 PM   #11
TECH Fanatic
iTrader: (13)
 
NufNuffZ28's Avatar
 
Join Date: Mar 2004
Posts: 1,097
Default

Not a great launch....I had some spin, but here is a video with a 1.59.


http://www.hpjvids.com/humor/nufnuff.wmv

Chris
NufNuffZ28 is offline   Reply With Quote
Old 05-18-2005, 01:06 PM   #12
Staging Lane
 
white_ta's Avatar
 
Join Date: May 2005
Posts: 68
Default

Quote:
Originally Posted by NufNuffZ28
Not a great launch....I had some spin, but here is a video with a 1.59.


http://www.hpjvids.com/humor/nufnuff.wmv

Chris
Nice.
white_ta is offline   Reply With Quote
Old 05-18-2005, 08:43 PM   #13
11 Second Club
 
rebersole2's Avatar
 
Join Date: Feb 2005
Location: Amite, La
Posts: 159
Default

I use a TCI Super Street Fighter (3500- 3800 stall) on my footbrake combo. I launch about 1800- 2000 rpm. Just enough to clear his throat and it helps avoid any bog situation. My older car was a quite bit quicker and had a 5500 stall, but it launched and responded much better when I nailed it off idle. I too, agree with Villian.
rebersole2 is offline   Reply With Quote
Old 05-19-2005, 03:01 PM   #14
TECH Enthusiast
 
Kirby's Avatar
 
Join Date: Sep 2004
Location: Midland, TX
Posts: 598
Default

I'm about to get a 3800 stall with a high STR. Hopefully with the high STR I won't have any bogging problems, just traction problems. I need a big stall because my car has 2.73s and is running a 13.7 1/4. I know its slow but I'm still working on it. How high do you think I could foot stall with a 3800 lock up converter?
Kirby is offline   Reply With Quote
Old 05-20-2005, 07:13 PM   #15
'Bird Director
iTrader: (80)
 
y2k_ta's Avatar
 
Join Date: Dec 2001
Location: Central Indiana Honors: 4th grade spelling bee contestant
Posts: 12,694
Default

I launch my stock converter at 1,000 RPM. I used to just launch at idle when I had 2.73's, but since I switched to 3.73's that changed. If I don't launch it at 1,000 RPM, the car falls flat on it's face.
y2k_ta is online now   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Launch RPM's? 3rdCoastPowerSports Drag Racing Tech 13 02-01-2012 04:09 PM
how to launch w/ Stall ? trilkb LT1-LT4 Modifications 21 09-03-2010 06:31 PM
what rpm to launch at jhall Drag Racing Tech 5 04-17-2008 10:53 PM
Commonly Asked Stall & Transmission Related Questions 02NBMFormula Automatic Transmission 6 11-29-2007 06:46 PM
Have Yank 3500 Stall no Idea how to launch with it!! ONGRNGO Drag Racing Tech 3 10-21-2004 09:45 AM


Tags
3800, 93, 95, auto, automatic, braking, camaro, car, converter, foot, launch, launching, ls1tech, stall, z28

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 04:12 PM.