T/H or Not?

[McRat]

Should you run T/H when drag racing? It depends on your setup.

T/H locks the converter early in 2nd gear, and this is important. If you have a tune with poor performance at 2000rpm, T/H will slow you down since the 1-2 rpm drop is huge. With no converter slip, it drops to 1900 rpm on the 1-2, but since there is some lag, you won't see that number on your tach. You are better off riding the converter in this case. With either elevated shift points or huge power down low, T/H will drop about .1 off your ET assuming the taps are the same.

However, there is a different set of taps stored for T/H as Normal. These control shift firmness. Your best ET's will be by always beating on your truck in T/H and never driving responsibly in T/H. This way the taps are set to "kill" every time you hit the T/H button.

Sled pulling is a different subject. Most tuning only trucks will want Normal mode to keep the RPM as high as possible going into second to maintain momentum.

 

[maddogg101920]

:rubeyes::hail2::hail::rockon: wow i think im goin to the track this friday to test something.

 

[ripmf666]

I'v always used t/h, lost almost 1/2 sec without it with trans just with a converter and transgo, But I think with the new turbo I could use more rpms.

 

[maddogg101920]

im def going to try that pullin i got a test pull comin up the week before the buck so im goin to try it.

 

[ecc_33]

I agree very much so Pat but with pulling the gear ratio from 1st-2nd is so close and our trucks shift so fast i dont even hear the 1st-2nd shift and barely hear the 2nd -3rd shift....thats with tow haul + co pilot on kill

In all honesty im probly in 3rd gear at 3200rpms at about 50-75 feet. Thats no lie.
Thats with 33_12.50 STS trxsus 32psi front 45psi rear and 1000# hang wieght

Im just stating what ive experienced....Ive never tried pulling without TH off because i feel with all the rpm's i carry it would be a real waste....I havent seen under 3500 rpms this year in 3rd gear low lock. I have ran so far as 4th gear low lock and about 3300 rpms too

Im not saying im right and i already know i Dont know everything And Pat im not tryin to bust your balls either LOL

 

[maddogg101920]

I agree very much so Pat but with pulling the gear ratio from 1st-2nd is so close and our trucks shift so fast i dont even hear the 1st-2nd shift and barely hear the 2nd -3rd shift....thats with tow haul + co pilot on kill

when mine shifted last year it kept bouncing back and forth from 1 and 2 and killed my pull.

 

[ecc_33]

I hope that wasnt 4lo ......Never ever pull in 4hi it will kill your tranny fast!!!

 

[ecc_33]

In further reading your post i think you are saying with a Mild tune and possibly stock tranny too?....Sorry if im comin off the wrong way with this thread...Im not trying to start conflict in any means just trying to add what info i have to give





:hug::hug::angel:

 

[maddogg101920]

I hope that wasnt 4lo ......Never ever pull in 4hi it will kill your tranny fast!!!

yea i know but i have to pull 4hi cuz too pull 4lo id have to go to 3rd and that gear is all but toast.

 

[bullfrogjohnson]

yea i know but i have to pull 4hi cuz too pull 4lo id have to go to 3rd and that gear is all but toast.

dont pull 4hi you will toast your tranny worse, and it will gear hunt severly if you dont have the power, you will be fine in 4lo, even if your 3rd gear is shot, you will do less damage in 3rd 4lo the 3rd 4hi

 

[maddogg101920]

dont pull 4hi you will toast your tranny worse, and it will gear hunt severly if you dont have the power, you will be fine in 4lo, even if your 3rd gear is shot, you will do less damage in 3rd 4lo the 3rd 4hi

i pull first 4hi haven't had a prob yet. my tranny is already pretty much junk if i toast it then ill get a new one under warranty and pull 4lo 3rd.

 

[McRat]

I pulled in 4HI on a very muddy track to stop the gears from hunting, but I had it in "1".

As far as T/H with sled pulling, if you've moved up your 1-2 shift point, Normal should not be needed. But if you let it shift the 1-2 at 3200, and there is good traction, you will get a brief bog as it falls off the charger going into second. Guess it depends on the tires and the track, but normal should not hurt.

 

[maddogg101920]

im gonna try this i got one pull comin up before my next points pull so i might try a few differnt things if they work i might use them if they don't then im not doin to bad with the old way i pull.

 

[WildChild]

So with a stock (for now) TCM calibration you should or should not use T/H when sled pulling

 

[McRat]

If you leave your 1-2 shift point at 3200, and you have a tight track, you can avoid the bog that happens on the 1-2 by using Normal instead.

On a loose track, it will make no difference.

All T/H does at WOT is use a second set of Taps, and lock the converter faster in second.

 

[LBZ]

So If I understand this thread correctly, drive it like you stole it in T/H, and you will have better shifting at the strip correct?

How long does it take your tranny to unlearn the responsible tow hauling you did when you pulled your holiday trailer 1000miles and will start to shift like you want it too on the track?

 

[MAXLLY]

It takes 4-6 good hard long pulls (0-80 mph) and it comes around for me. Kat and i discussed this a few months ago and she said it takes her TCM about 5 passes for her's to come around.

Just beat it like a $2 ho and then switch off T/H.:rofl:

 

[LBZ]

No wonder it shifts like sht in t/h when i pull trailers!! I beat on it all the time!!