UA-65274002-1 Jump to content

Recommended Posts

I have a '96 Grand Prix with the L82 v6. I intend to do an engine swap some time in the future when I have the time and resources to do so, but for now I'm interested in what my options for upgrades are or if it is even worth it to modify the stock engine at all. Is a goal of gaining 20-30 horsepower realistic with some bolt on parts and an aftermarket ECU? I want to hit 200 horsepower but 180-190 seems much more attainable.

Edited by Amanita
wording

Share this post


Link to post
Share on other sites

Theres not much you can do, ive got the same engine in my 1994 CS. One thing is going with a magnaflow cat converter and downpipe assembly coupled with a mandrel bent exhaust, if anything it`ll sound amazing. A true cold air intake system and not just a cone on the end of the factory tube, again wont do much 10 HP would be generously over estimating. Aftermarket ECU will more than likely leave you on the side of the road, there was another option for an ECU swap from an older W-body model that could be re-tuned but i dont know if anyone other than RobertSaar can do it. Save you money for a professional engine swap to a 3400 or even the L67 swap instead and enjoy the fuel economy in the meantime.

Share this post


Link to post
Share on other sites

For an easy no fuss swap, dump the L82 & pick up a healthy mid 2000's LA1 engine. There is a noticeable difference in the two engine's output. An aftermarket or reground cam will wake up the engine even moreso. Porting & polishing both the heads & the intake assembly adds to the  performance.

 

The L82's were stricken with the small dia exhaust, all LA1 engines were 2 1/2" at the downpipe.

Edited by 55trucker

Share this post


Link to post
Share on other sites

Personally I'd just do a 3800 swap. My 97 Monte was 3400 swapped when I got it. Did a few things to pep it up while I was collecting to l67 swap. Once I did my bone stock l67 swap I felt goofy for the work I put into the 3400 lol

Share this post


Link to post
Share on other sites

L67 /4T65e HD is going to be the most cost effective too in the end. 

You start bone stock at 242 HP and just doing the basics in the PCM will see over 250hp without even doing a "power tune".

City will be about 15-17 mpg, highway will see just under 30 mpg. 

All in all not bad considering you'll be able to do 0-60 MPH in 6.5 seconds with a stock engine and tranny from the wrecking yard. 

Share this post


Link to post
Share on other sites
1 hour ago, l67ss said:

Personally I'd just do a 3800 swap. My 97 Monte was 3400 swapped when I got it. Did a few things to pep it up while I was collecting to l67 swap. Once I did my bone stock l67 swap I felt goofy for the work I put into the 3400 lol

Well that's why I suggested *for an easy no fuss* upgrade one of the last LA1 engines, they were the best LA1 that GM offered for HP & torque figures,

an L67 is a worthwhile upgrade but that's an entire powertrain/electronic swap, one doesn't really want to be putting 270 ft lbs thru a 4T60e.

Edited by 55trucker

Share this post


Link to post
Share on other sites

Edit: Oops, wrong thread.

I suggested doing the 4T65 at the same time. Figure a wrecked car for $350 for the drivetrain.  I really think the whole swap could be done for about $500. A lot of bang for the buck.

Share this post


Link to post
Share on other sites

You could always do a large port swap. In 2000 3100s got the larger 3400 stuff. Larger port heads, larger port intake manifolds, and larger 56mm throttle body. I did that to my brother's L82 in his 96 GP. You'd be turning your L82 into an LG8.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×