Thread: Realistic gains to expect from an intake?

04lss, see my post on FullThrottle?
I gave a decent bit of info on modding these engines.
Search these forums for Safely Modding Your 3800. Very good info =)

http://www.grandprixforums.net/showthread.php?t=17482
Safely Modding Your 3800 Powered Car!!

Originally Posted by SnowFlake

Both of these comments are entirely false.
Stock L67's make 180-190whp, not 223whp.
Headers usually add 15-20whp without a tune or a pulley.

I've had dozens of these cars on a dynojet. To say they lose power with headers is ludicrous.

I've "felt like" I lost some low end when I added headers with stock pulley, but gained a good chunk of top end. No dyno numbers to verify this, though.

Originally Posted by SnowFlake

Both of these comments are entirely false.
Stock L67's make 180-190whp, not 223whp.
Headers usually add 15-20whp without a tune or a pulley.

I've had dozens of these cars on a dynojet. To say they lose power with headers is ludicrous.

Hell froze over...

Because this is correct.

If your stock L67 car makes 200WHP or more, you'll be lucky.

Adding headers lowers boost numbers because the car is flowing more freely...you then add the pulley to make up for the loss, because all it is doing is shifting the power up...you're not losing ANY power, and it's easier to launch because the torque is now geared a little higher in the band.

HiPo Pontiac did a test I think on an SSEi back in the day, and it gained close to 30WTQ and north of 20WHP. L36 gains were close as well...because I think they tested a GP GT too, just to compare...and to show how crappy and restrictive the manifolds to the catback really are.