launching in an auto

[pacecar79]

right now i have an 86 notchback stripped down in the garage. i wanted to convert it to standard but have been contemplating leaving it auto for consistancy at the track. it seems that you can get a better launch in a manual by holing the clutch and revving to whatever rpm then dropping or letting out the clutch. how could i do this in an auto? would i have to install a transbrake? a stall converter, 4.10s and a shift kit are a deffinite. Does a manual valve body have a drive gear or does it always have to be shifted manually? also does the car just completely not move with a stall converter untill you hit the stall speed? sorry for all the questions im just trying to weigh out my options and get some good info. thanks guys.

 

[V6Mustang04]

M/T

Manuals are not controlled by any computer, you shift when you want to. they dont have drive gears. ive heard of this one VW that had both.

 

[PhLoBuS]

if you want a really good launch in an auto get a stall converter

 

[rsw007]

go auto if you plan on going really fast one day.many people switch from aod to 5speed then back to c4 when they get really fast. due to traction problems with 1st gear in the 5speeds

 

[pacecar79]

what happens if im below the stall speed while im driving on the street, say like turning onto a street and im below 3000 rpm's (if i had a 3000 stall converter) and i hit the gas, will it wind up the rpms then kick in when i hit 3000 rpms? like a slipping tranny almost? im having trouble understanding how it works.

 

[rsw007]

its not like that way. if you kick it the rpms will jump fast up to your stall then start pulling, but not that agressive. it will move at rpms below stall but when you punch it it will quickly move to the stall rpm. hope this helps best thing is to ride in car with stall and you will see

 

[hllon4whls]

Drag racing auto trans 101.

Transbrake - a solenoid to put the tranny in first and reverse at the same time. Binds the tranny and releases very quickly to get a consistent launch. Not legal in street or NE classes. A transbrake will not creep if working properly.

Stall converters - can be made to "slip" more under load. Stall speed is determined by car weight, converter size and motor torque. Puts the engine in torque band for a hard launch. Torque is multiplied anytime any converter is not locked up. Flash speed is what the RPM's will jump to when you floor it.

Manual Valve body - shifts in any gear when you tell it to. Nothing auto. Like a stick without a traditional clutch.

Reverse manual valve body uses shift patter PRN123 as opposed to PRN321. Keeps you from hitting neutral by accident.

Must have a good tranny cooler with any race transmission.

 

[pacecar79]

thanks guys, that deffinitly does help alot, i think i am gunna stick with an auto!

 

[willys1]

yeah a high stall speed conv. is just like a stock converter really,,it just revs more.A manual valvebody isnt real streetable,others will disagree.Get a good name conv. Precision Industries,,edge converters.If your motor is stock you want a 24--2500 stall speed.Get some gears,373's or 410's,,and a shift kit If you get gears your gonna want an aluminum drive shaft.With the steep gears youll get a bad drive train vibration at high speeds.