Just want to add some of my own experience here... and I agree 100% bud! If anyone that is running a 4t40 or 45e and you have access to HP Tuners or DHP you will quickly see that the way GM set up the transmission tune is for a Sunday grocery getter. When they built it, their #1 goal was to try and find happy medium between ride comfort and fuel economy, also why they set factory pressure at 30psi on the tires, when we should run 34-36 minim! Anyway.... back to the trans.... the trans is set up to make the shift as smooth as possible for the end user. Great of your a customer that just uses the car for normal, run of the mill, go to work, get some food, take the family visiting, and so on. BUT, for guys like us this will not do! With the shifts set as soft as they are we are doing major damage to clutch plates and overheating the entire unit. Do this too many times and ka-blewy, you are getting towed.
Increase shift pressure, shorten shift times and raise shift points. Also raise the Torque Converter lock up and you now have a trans that will take just about anything a stage 2-3 NA build will throw at it, and will most likely stand up to a good amount of boost if set up right as well. I say most likely because I will be testing this theory as soon as I can when I add 14psi to a Milzy Stage 2 build that runs 14.1 as of now.
I should add too guys, you cannot set this transmission up properly with the factory trans mount, the one at the very front of your car. There is simply too much play in it, even brand new. I have had many guys over the years argue that one, but trust me guys, I know I'm right on this one. I killed three trans mounts in one summer, and when I say killed I mean killed! Tore the ever living' crap out of them! Put in Milzy's trans mount 5 years ago and have never looked back. With the mount I was able to increase shift pressures by almost 50%!! My trans stays nice and cool no matter how much I beat on it, or how many runs I make. To give you an idea here, I had days at the track where I ran up wards of 30 times in just one day, and there have been dozens...ahhhh yea...
Sorry for the long post guys, but the 4T45E in my opinion is a great trans, GM just had to go a little soft on their tune. Oh, and so you know, when I did my GM Motive Power Autobody Repair and Collision ticket, the fellow that taught me GM electrical for two weeks was the guy that actually designed the trans...lol And a good portion of my tuning training and ideas come from Greg Banish, the guy that sets up the PCM's for General Motors and has literally "written the book" on tuning. He truly is one of the best in the world. For almost two years I was in contact with him at least twice a week when i went through this, and he backs up my methodology 100%!

I like my '03 Alero tranny a lot better than the '99. Not sure how it will do under boost. I did have the front mount on the '99 disintegrate, too. The replacement tranny we put in the '99 two years ago did ok, but never seemed to shift as firm as the original one. The tricks I was using on the original tranny did not work on the replacement, but then again I was at a higher power level by then.

I have to agree that given the amount of intentional abuse on these units, they did quite well.

Now where was I
 

We may have a chance to test these theories. This is turning into one nasty ride (+blue plate clutches and new TC)

I wonder if your experiencing any "loss" of air flowing in the intake with that snaky setup you got there?

i doubt it, an intake can have as many curves as it needs and its still gonna bring in the same amount of air, as long as its not leaking anywhere.

Its easier to suck through a shorter straw then a long one. Easier to suck on 2 straws at once compared to 1

yeah true. lol.

yeah you should get your intake as straight as possible... lol I 've put the battery in the trunk in all of my s/c'ed car, the LD9, The ECO and the L67...and... well my buttdyno tell me it does a difference

Hey, thanks for the tranny tune! Can't I just chain the engine to the frame? lol

I'm at square 1 with a new blower and trans rebuild, motor is on the way out, though :( Going to mod one step at a time to see the effect of each. Not as much power as the previous build yet, but it's getting to be fun to drive again.

Stock MAF, bored out TB ( to 65mm), stock UIM, (no EGR), stock FPR, 3 inch exhaust, supposed to be a built tranny, with MMGT1 tune. 2nd burnout in the vid, see slight shadow on the dash from tire cloud ;)

Here's a look and listen, pay no attention to old guy driving, he's crazy.

http://www.youtube.com/watch?v=1PsQ0Gp9vQw

68mm TB
 

got to 12 psi, brought groceries home safely

Nice!!!

I like the sound of it... e-mail me a log and the tune you have on it man, I'd like to have a look!!

What is your cable bracket bolted too ?

Just the one bolt on the TB right now, the bracket wraps around it. I don't know how it will be positioned later, so don't want to tap holes yet. Something changes on it every other day lol

Nice video!! Love that car....that engine bay is so damn clean...whole car is prob spotless. Gotta get that thing to ASS!

Thanks, but it's not too good in person, I have to mess with the light and camera angles. The red 2003 is decent, though.

How's the car doing there bud? Manage to play with the trans settings a little more yet?

Yeah, did you get the last emails on the 13th? It's doing better than that now timing-wise, could use a better 1-2 shift, see also thread on last Test & Tune. Trying to intercool it now, hoping for another 5% HP/Torque under the curve. It will be a challenge though

Boost vs. RPM

http://www.youtube.com/watch?v=mOMs7UVv_N0

Damn, that blower is loud. No sneaking up on anyone in the white car.