Vetal

iTrader: (3)

As some of you might know, I was swapping M6 for 4L80E on my turbo 383 LS1. I've never had autos before so don't know how stall works, but I was a bit surprised - to get it moving, I should rev to some 1600-1700, while to keep up with traffic from the lights I have to rev to some 2300. Is this normal? I have 3.73 gears if that matters
here's video I've made to ilustrate this
http://www.youtube.com/watch?v=OKbdIUg382U

macknmikey

iTrader: (14)

doesnt seem like your taking off in first to me, i have a 3800 stall and it takes gas to get it moving but it seems to accelerate quicker then that..

i see your ses light is on maybe for the trans? might be in limp home mode

+badss+

iTrader: (12)

What stall do you have stock or performance? Also remember the 4l80e has a 2.48 first gear, 4l60e has a 3.06 first gear. Rear gears will help it move out faster also not slow it down

Gilbert@Ace Racing

That appears to be proper operation.

g

Vetal

iTrader: (3)

macknmikey, it goes through all gears just fine
badss, it's 3500 stall so it's not stock I have 3.73 gears, which gears do you think will help?

Gilbert, you're sure? Cause I feel my gas consumption almost doubled when I switched to 4L80 with 3500 stall...

slow67

iTrader: (2)

Seems normal. The more load you put on it (IE cruising in 3rd or 4th gear) will require more torque, so it slips more than it would lightly taking off. As for mileage, lockup is your friend for fuel economy.

Fbodyjunkie06

iTrader: (10)

I have to give mine about 1400rpm's to get moving in 1st, but once I'm in 3rd or 4th the most it takes for me to keep speed up a hill or keep up with traffic from 35-55mph is 2200-2500rpm. I try to hit my lock-up switch as soon as I hit 50mph to help with mpg. This is with a 3800 stall. With my old 3200 stall it only took 1000rpm to get moving and 2000rpm to keep up with traffic, it truly felt stock and got good gas mileage in town. That was also with 3.08's. New set-up kills gas in town at about 14-15mpg, but once I'm on the highway at 70 I get 20-22mpg.

cals400ex

iTrader: (27)

make sure you have the correct amount of tranny fluid in the car. if it is low you can get a little more "slip" out of it.

Vetal

iTrader: (3)

I suspected low oil level but check it 3 times already, it's even a bit more than normal.
Here's daylight video I took today, you can see that at 1600 in 1st it barely starts to move
http://www.youtube.com/watch?v=CuqUT6IUBWo

P.S. My TC doesn't want to lockup, only did it twice on a trip on a hot day, I read a bit and some people write it wouldn't lock until tranny fluid warms up to a certain temp, but I couldn't find such a parameter in HPTuners. How do you manually lock TC? Do you tap into S ("TCC Control" wire)? And, is there 12V or ground?

Vetal

iTrader: (3)

Anyone can shed some light on TC locking?

cgroh89

iTrader: (15)

If its a 3500 stall its not going to flash till around 3500, thats why the auto cars are getting crappy mileage. (big stall guys)

its fine.

Vetal

iTrader: (3)

Does anyone have a link to driving stall videos that were in stickies but unavailable anymore?

Gilbert@Ace Racing

Yes I am certain that is proper operation. You might have a Tuner take a look at you tune in order to see if it's correct or not. Other than that there is nothing you can do except verify that the lock up featute is operational.

g

Vetal

iTrader: (3)

Converter locked only twice, on a hot day, but I think that is more a problem in the tune and not the converter itself. I'm trying to figure out why it doesn't want to lock, and also a way to lock it manually

Gilbert@Ace Racing

There is no need to lock it manually if the transmission is build, wired, installed and tuned properly.

Tell me about your car, tell me about the installation...

g

Vetal

iTrader: (3)

Then why do people put manual TC lock switches? As a former stick guy I'd like to have more control over tranny (and better mileage, of cause)

In short... This is 98' LS1 TransAm. I put TC78 turbo on it, swapped PCM to 00', and just a week ago I more or less finished swapping M6 for built 4L80E. Converter is multi-disc, 3500 stall, from Circle-D (thanx again, Chris). I tune this all with HPTuners. They had 4L80 segment swapped for me (into my M6 file, maybe it wasn't the best idea and I should have started with auto tune??). Wired everything by myself, both PCM and tranny.
Obviously I don't know anything about tuning this thing, so I'm trying to learn. The major disappointment was that I have to rev it to 2300 to take off in city, I used to start from 700-900rpm with M6, without extra noise and gas burning. But from your words and couple of vids I found on Youtube that seems normal for such stall. I'd have to get used to it (or figure out how to lock it early down low, on small TPS).
Now few obvious problems are,
1) terrible vibration after ~55mph (I put new steel driveshaft during swap)
2) TC doesn't want to lock up (did it only on one trip). I can't for now figure out why it doesn't want to lock. Probably smth. to do with fluid temps?
3) in HPTuners, converter slip is almost always 80% which is obviously wrong
P.S. Didn't yet test to what rpm does TC flash, maybe if it's more than 3500, than restall is needed? which would be very bad cause shipping of that thing to US and back would cost fortune

c0ncEpT

iTrader: (4)

It looks pretty normal.

If I had a phone that took video I would shoot one at lunch as I drove the car into work today.

My converter flashes between 3800-4000.

I would say with my driving style it sits at about 2500 while accelerating normally away from a stop light.

Vetal

iTrader: (3)

wow, do you have any city mileage at all?

Cool28

iTrader: (2)

Well since its turbo it should be fairly tight till you get into boost I would think?

slow67

iTrader: (2)

The most common reason for the TC to not lockup is the PCM is thinking you have misfires (from the smaller than stock torque converter, or a cam, or both).