chevyrunner

iTrader: (4)

the other day i was doing a burnout before a race. i started in first then as the rpms got higher i put it into 2nd but the car didnt shift. so i put it up into 3rd and it shifted into 3rd fine then i shifted back down into 2nd and it went into 2nd fine..

why wouldnty it shift into 2nd from first initially ?? any thoughts?

mrvedit

There are just too many variables going on here to even venture a guess. Depending up the tire mph, engine rpm and throttle percentage during the burnout, this might be normal. Does it shift fine under other "normal" situations?

chevyrunner

iTrader: (4)

lol dont kno i dropped a seat during the burnout n my head and broke a valve off in the heads. so the motor was pulled lol

01ssreda4

iTrader: (96)

Stop shifting during burnouts Start in second, end in second.

mrvedit

Please explain why I shouldn't just leave it in D3 or D4.
(I don't know about about this and am eager to learn more.)

NufNuffZ28

iTrader: (13)

If you leave it in drive or overdrive it will "search" back and forth between 2nd to 3rd(keep switching back and forth)

01ssreda4

iTrader: (96)

Well putting the shifter in 2 makes the trans start in 2nd, and end in 2nd, meaning no shifting occurs during the burnout. Shifting during the burnout is hard on the trans, and give you a good chance to 1. hit the rev limiter and 2. have low wheel speed and not get your tires hot. Asking the trans to shift during a burnout just over-complicates things. You can only start in 1st or 2nd with a stock trans, and 1st gear doesn't have enough wheel speed to really get your tires spinning and it will try to push you. Here's an example of a 2nd gear only burnout: simple, quick, effective.

carlsonauto

Also on a TH350 or TH400 a 1-2 shift during a burnout is absolutely murder on the intermediate sprags. Using one gear during a burnout also helps the consistency of the burnouts. That way if you are doing back to back runs testing things for improvement or bracket racing it takes the burnout out of the equasion to a point.

01ssreda4

iTrader: (96)

That too

Monte4ever

iTrader: (2)

Good points. I use to start in second then shift to third. Ima try staying in second whenever I get back to the track lol. Its been a while.

mrvedit

Am I mistaken? I thought with the shifter in D2 the trans still starts in 1st gear but won't shift past 2nd gear. (Assuming a stock valve body.)

slow67

iTrader: (2)

Depends on the PCM. My 2000 stays in 2nd.

01ssreda4

iTrader: (96)

Mine does 2nd only when 2 is selected.

got-a-ls1

iTrader: (12)

my 2000 always started in 2nd. my 99 will not start in second. i compared the files and the 2000 and presumably up years have tables for the d2 position to allow it to start in 2nd. nothing in the 99 file.

tjwashow

iTrader: (2)

that is interesting, i have a 98 and i cant start in second. when i put it in 2 it starts in first gear.

pancho toco loco

iTrader: (8)

94 here and can't start in 2nd