I'm doing CAI sometime this summer - already have the cone filter ready to go in. I'm thinking about the 3.4 too. Make sure that you do the CAI, U-Bend bend delete, and maybe 180* t-stat before you put in the 3.4 though. If you don't, you could end up making less power than stock due to KR.
Beyonf that, I think I actually might upgrade my front rotors before I do the pulley swap - the brakes are the GP's Achilles heel IMO. Anyway, good luck with your's and tell us how it comes out.

 

As my car sits, I have a 3.4 pulley, CAI, 180* t-stat, one step colder plugs, u-bend delete, and DHP. I was at the track last summer and ran a best of 14.1 at 99.2 mph. If I could get traction, I would've been in the high 13's since my 60's were usually around 2.2 give or take. Hey Dave, I think the tranny is the GP's achilles heel. I've been lucky so far, but I know people who have been much less fortunate.

 

Yes that is a good point about the tranny. Honestly, it's the one thing that's really keeping me from modding. I keep thinking, do I really want to take a car that's running perfectly and start messing with it? My tranny shifts great, but I want to start loading power on it when all I see on clubgp drivetrain forums are "tranny failure" posts?

 

You can rebuild the tranny with better clutches and housings. You definitely have to send some components for the freezing process. I cant think of the proper name right now but it works. Oh, cryogenics, thats it. What is CAI? I should know it but cant think of it.

 

You can rebuild the tranny with better clutches and housings. You definitely have to send some components for the freezing process. I cant think of the proper name right now but it works. Oh, cryogenics, thats it. What is CAI? I should know it but cant think of it.

Just cold air intake. I think I'm goonna just cut my stock airbox open and use some reflectix tape to seal everything off.
The tranny can be strengthened, but it's already investing a bunch of money. I think I'm gonna do 180 t-stat, ubend, and 3.4 pulley and leave it at that for powertrain stuff. That, as Chevy454 noted, gets you to about a 14 second car. That's fast enough and not a whole lotta money to get there. Then I'm gonna work on suspension stuff.

 

Duh. I should have known that one.

 

I've had a 13.9 second GTP and I now have over 80,000 miles on the stock tranny. The tranny is actually not as bad as most people think. What happens is the differential is junk and when people do one wheel peels it heats up the differential and it starts coming apart sending shrapnel through the tranny. Then the tranny fails and everone thinks it's a week tranny. Then a new tranny is installed and the already trashed differential ruins another tranny.

Get a nice LSD and tranny cooler which can be had for $500 bucks and your tranny will most likely live a long life.

 

My '97 GTP has almost 98K and the tranny is still running strong (knock on wood).

 

I know this is a silly question, but does anyone know what we can do to to the motor w/o violating the warantee? I picked up an 05 Monte SS Supercharged about a month ago, and I tried asking the parts guy at the dealership what was and wasn't allowable. Like underdrive pullies, intake, ect..., and he just looked at me in a very clueless fashion. I am eager to squeeze more than the 240 horse outta my 3.8, and I am tryin to find out what I can do.

 

I'm modded. She moves a little

 

I know this is a silly question, but does anyone know what we can do to to the motor w/o violating the warantee? I picked up an 05 Monte SS Supercharged about a month ago, and I tried asking the parts guy at the dealership what was and wasn't allowable. Like underdrive pullies, intake, ect..., and he just looked at me in a very clueless fashion. I am eager to squeeze more than the 240 horse outta my 3.8, and I am tryin to find out what I can do.

The only thing you can get away with is mabe a 180 t-stat and a CAI or a FWI (cold air intake or fender well intake) The main thing is if you do drop pulley sizes and what not they will void your warranty that is if they can prove it was the aftermarket part that caused the real issue. The most important thing you want to keep an eye on is Knock Retard. Go to www.CLUBGP.com. You will find unlimited information there or you can contact me. The 05 Impala SS has the series 2 motor in it rather than the series 3 like whats in my 04 GTP. There pros & cons about both, but IMHO i like the series 3 better. Built a lot stronger, but it doesnt matter both great motors. Go to www.pfyc.com and then hit up www.zzperformance.com.

Check out the Magnuson Act for the warranty issue. Make it look like you know something when they give you crap about mods.

 

its like a drug to me. i keep saying just one more mod. well after my headers i guess ill have to get a intercooler.

 

h.d. trans axles should be good for a high 12 second car. the most important thing you have to do while your playing is turn your traction control off. if you dont all the power will impulse and destroy your input shaft. the intense shift pak also helps. it makes the car shift faster.

 

h.d. trans axles should be good for a high 12 second car. the most important thing you have to do while your playing is turn your traction control off. if you dont all the power will impulse and destroy your input shaft. the intense shift pak also helps. it makes the car shift faster.

That's a good tip! Thanks.

 

i personaly like www.intense-racing.com for my parts. they are a great group of guys.

 

A local guy here is running a turbokit that replaces the S/C, I think he is running low boost as he is not I/C at the moment. IIRC he is running mid 12's while others with the kit are dipping into the 11's

 

i havent done much with mine but then again my car is an slp gtx model

3.2 pulley
magnusson nose on supercharger (ported-polished)
slp-gtx functional ram air hood with cold air intake
reprogrammed ecm from slp
slp 1.6 rollers
slp exhaust

only gets about 345 hp but runs low 13's to mid 13's everytime and about the tranny problems most people do high mileage trans flushes bad idea just need regular services and your tranny will provide i have 163,xxx on mine and still shifts beautifully but then again i do services every 5,000-10,000 miles im paranoid lol

 

also the 2005 3800 is a series 3 motor rated at 260 hp

 

also the 2005 3800 is a series 3 motor rated at 260 hp

Due to a more efficient supercharger I believe.

 

also the 2005 3800 is a series 3 motor rated at 260 hp

Of course, torque management pretty much negates this power increase.

 

Of course, torque management pretty much negates this power increase.

easy solution for this. a reflashed pcm.

 

I have a 98 Ultra i want to put a cone filter on, unfortunately the airbox also houses an engine computer, does anybody know if leaving the box open will damage the computer or what i can do?

 

I have a 98 Ultra i want to put a cone filter on, unfortunately the airbox also houses an engine computer, does anybody know if leaving the box open will damage the computer or what i can do?

No. You can leave part ot the box in place or remove it altogether... tie wrap it in place with a bit of padding underneath or purchase a small tray to mount it in. I think there is actually a GM truck part that works well for mounting it... you could try going to clubgp.com and search for "PCM tray"

Here is my 3800... I polished the SC myself (lot of work!).

 

You know, you guys wouldn't have to worry about torque management, transmission issues, or shift points, if you install a device called a manual transmission...

 

I have a 2004 Supercharged MC (with 7600 miles) and have been contemplating mods. I have seen the internet sites, such as Thrasher, but have refrained from doing so since the car runs so well. Besides, my wife and I are in our 60's and she does not drive the car since she cannot see over the hood (she claims) which may force me to trade it in for some other vehicle (minivan or SUV) that fits the both of us.
Otherwise, I would begin with the CAI and a CAT back system then on to the 3.4" pulley since these are the easy changes and do not really affect the motor (versus new heads or exhaust manifolds).
As usual, GM has no support for these nice cars (GP's and MC's) nor do the mags such as Chevy High Performance (which is only interested in big block Camaros and v-8's exclusively).