|
Trans brake and delay box question(s)
#1475276
07/28/13 02:37 PM
07/28/13 02:37 PM
|
Joined: Jun 2004
Posts: 148 Montgomery, PA
dodge340dart
OP
member
|
OP
member
Joined: Jun 2004
Posts: 148
Montgomery, PA
|
After racing the last two seasons in a .500 pro tree bracket racing eliminator and winning the track championship both years I have decided to move to another class. This is based upon the fact that the car count has dropped so low that the payout even when you win puts you at a major loss for the night. I have been footbraking the Dart since I started racing in 2001 and while I am decent on a sportsman tree I am very good on a pro tree, I am thinking of moving to super pro so I can react to the top bulb similar to a pro tree reaction. I have to add a transbrake and a delay box and while I have a good idea of what to do I would like some input from those who have used these in the past. I have a '69 Dart that weighs 3033lbs with me in it; the Dart 60fts around 1.50 and run the quarter at about 11.40 at 115mph. It is a 340 with a 904LBA reverse manual and an 8 3/4" with 4.10 gears. I footbrake the Dart to 3500RPM and slam the pedal to the floor on the flash of yellow, the converter (PTC 9.5") flashes to 4800RPM and I am off. I averaged a .024RT for two years with this technique.
So what mods do I need to perform to my transmission or car? Should I move the vent? Do I need to go to billet drums? 4 clutch packs? 5 clutch packs? Drill additional vent holes? Modify the pump? If I hold the RPM to 3500-4000RPM on the transbrake will the 8 3/4" have similar impact on it as when I footbraked?
Any input would be great.
Thanks,
Chris
2011 & 2012 Beaver Springs Dragway Outlaw Street Champion
2012 BSD Friday Street Racer Driver of the Year
3-time Jr. Stock Eliminator
2-time Mean Street Eliminator
'69 340 Dart 1.500 60ft, 11.359et, 117.08mph
|
|
|
Re: Trans brake and delay box question(s)
[Re: Cab_Burge]
#1475279
07/28/13 06:23 PM
07/28/13 06:23 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
I would make sure your converter is built properly for a transbrake first
I dont think thats gonna be a problem.. looking at his numbers he isnt making a ton of torque so that conv should be able to handle it just fine.. even without anti ballooning plates
|
|
|
Re: Trans brake and delay box question(s)
[Re: MR_P_BODY]
#1475280
07/30/13 08:11 PM
07/30/13 08:11 PM
|
Joined: Jun 2004
Posts: 148 Montgomery, PA
dodge340dart
OP
member
|
OP
member
Joined: Jun 2004
Posts: 148
Montgomery, PA
|
Thanks for the input. I am still questioning if the 489 case 8 3/4" with a bearing spacer will be strong enough to handle a 3500RPM launch on the transbrake. Is leaving off a transbrake at 3500RPM a similar impact on the drivetrain as footbraking at 3500RPM? Any thoughts?
Thanks,
Chris
2011 & 2012 Beaver Springs Dragway Outlaw Street Champion
2012 BSD Friday Street Racer Driver of the Year
3-time Jr. Stock Eliminator
2-time Mean Street Eliminator
'69 340 Dart 1.500 60ft, 11.359et, 117.08mph
|
|
|
|
|
|