2600 stall

[SandMan817]

I was planning on purchasing a higher stall torque converter for my 02 sierra 5.3 4x4. It has an intake, tune and a catback exhaust. The truck is pretty quick right now but has such a low stall speeed which is slowing my launches down. How is a 2600 stall during normal cruise? I have 275/55r20 tires with a 3.73 rear end. I am going to get a custom torque converter built at a place in phoenix since i know someone that can get me them for cheapo. Does anyone have a video of a 2600 stall during normal cruise and from a dig?

[Gran Patron]

Any stall does good crusing after you've met the selected rpm range so once you start crusing at higher speeds it wont affect anything. It's just solely from take off were the importance comes to play when you get a higher stall. It really sucks in stop and go traffic once you go with 3000+ stall.

If you're looking for a cheap reliable stall you can opt for the Chevy Trailblazer stall that goes behind the 4.2L that stalls about 2600.

[SandMan817]

well the one that i would get custom made would be cheaper than i could find a trailblazer tcc, not to mention the stall comes with a warranty.

[SandMan817]

anyone with a 2600 stall have any input on this subject??

[CarolinaHD]

im gettin a yanktt2600 in February, costs 475 tho

[wentbig]

I am having a 3000 stall built now for my 2500HD. You will see a big change in launch and 1-2 shift. Your 5.3 has a 1600 stall now, remember you will still have lock-up. Just watch trans temp when towing.

[SandMan817]

01silvy check out roadruner converters, they are based out of phoenix, az and they make some great converters.

How big of a difference would a 2600 stall make for my 1-2 shift? How much of a rpm difference is there when changing gears?

[wentbig]

I can tell you on my 4L80E my rpm drops like 1500 rpm. What the 3000 will do on a dig I will start with an extra 1000rpm and the 2nd gear shift will still be in converter so the rpm stays up.
B&M has some good info on high stall converters. There is a relationship- stall to HP.

[SandMan817]

ah alright guys, thanks for all the info.

[SandMan817]

after installing the torque converter, will i run into any problems with the computer seeing too much slip?

[04SilveradoMykk]

Make sure your 'custom' converter isn't from Dacco in Phoenix... I have a 3200stall lockup converter in my '04 that was 'custom' made by dacco for me and it's awful.

[SandMan817]

It is from road runner converters, my teacher says they are great torque converters, hasn't had any problems with them

[04SilveradoMykk]

Road runners website doesn't even have 4l60e in the application list... weird. They say 4l60 which is a 700r4, non electric

[SandMan817]

If you are in the market for a high stall converter, let me know since I will be able to get it waaay cheaper than any other brand. Around the 200 dollar mark for a brand new 2600 stall for a 4l60e. If anyones interested, let me know what stall and tranny anmd I can get you a price for it

[Sinister C3]

I have a 2600 on the way for my C3. Didn't want to go all the way to 3000 with it. Can't wait to get it in. Not really looking forward to the install, but oh well.

[Atomic]

I have a PI triple disc 2600 and like it a lot. Its the only aftermarket converter ive ever owned though.

It definately softens up the shifts so you dont clang gears anymore (which I like). Everyday driving is fine, but offroading kind of sucks as well as trying to go up a ramp slowly or something similar, but I dont have to do that very much.

I can spin my 35x13s no problem with it, although the 4.56s do help. Shift extension is about the same as with a stock stall. During a wide open run there is only 100-200rpm of slip at WOT with it unlocked. You'll need to have your shift points adjusted too since it will be very annoying to drive with the stock tuning.

[SandMan817]

What do you mean only 100-200 of slip?

[04SilveradoMykk]

Damn, only 100-200 of slip.... I see 480-800rpm of slip in the 5300+rpm

[wentbig]

Atomic, how does it act in lock up? Do you use towhaul for performance and normal for normal driving?

[Atomic]

I did all of my own tuning with hptuners and I have the tow/haul settings the same as the normal so there is no difference.

Mykk, you have more slip because you have a looser converter whereas mine is very tight, not to mention a more powerful engine.

My converter locks up harder than my trans has ever shifted, it feels more like 5th gear than the torque converter locking. With an aftermarket stall you need to have the min duty cycle on the PWM to 99 and max at 100, otherwise the trans will allow partial slip to make it smoother which will burn the clutches in an aftermarket converter.

Where you want to have the converter lock is a very nit-picky thing. Some people dont like to lock until they are on the highway, others prefer it to lock sooner. It took my a few weeks of adjusting to get it where I like it.

[SandMan817]

i just have a diablosport predator, am i going to run into any problems with a 2600 stall torque converter? also, what do you mean when you say 100-200 rpm of slip?

[04SilveradoMykk]

I don't think you'd have any issues with the diablo.

Even though a converter flash stalls up to 2600rpm, the turbine and the pump don't ever really spin at the exact same speed unless the TCC is engaged. There will always be slip between the two at any rpm. Just how much slip is the issue...

Also, the other thing to take into consideration. The 4L60E doesn't have a input shaft speed sensor. So the PCM is just calculating the estimated input shaft speed based on the output shaft speed and calculated current gear ratio. My point being, there is room for error.

[SandMan817]

ah alright sounds good, i am going to be rebuilding my tranny and installing a shift kit while i am at it, that is part of the reason why i was asking.

[SandMan817]

posting on the diablosport forum, one of the moderators said that i would need to get a custom tune made for the higher stall converter. Is anyone running a higher stall with a DSP tuner?

[04SilveradoMykk]

An example of 'Slip' Here is a screen shot of the hystogram I use to log the auto trans in my truck. This is my '04 Silverado just going for a cruise around the block:

http://i40.photobucket.com/albums/e227/mykk/trans.jpg

As you can see, despite that I have a 3200rpm stall converter. At 5,903rpm. With 45% throttle @ 40MPH in 2nd gear... I have 266rpm of converter slip. And it gets worse with more throttle.

(BTW, I have my trans set up for manual shifting. That's why it's 2nd gear @ 40mph with 45% TPS)

[SandMan817]

ahh alright now i understand what your talking about. I am waiting for a response back from one of the DS guys about the higher stall.