Thread: Deciding between twin turbo or s/c 3800

Opening the engine is not worth the cost, unless you like paying a machine shop or un-needed work. The factory bottom end will support 400-500hp all day long if you wanted it too. It's the fuel and tuning that keep it alive. If the engine is healthy don't even touch the bottom end.

If you want 300hp, that is fairly easy on a blower. Swap in a mild camshaft, something like a XP cam, drop the pulley size down to a 3.0 or 3.2 size and do free flowing exhaust. Add some meth or run E85 fuel and get a good tune.

Get a junkyard L67, toss a 3.0" pulley and headers on it, get it tuned and running on E85. The 3800 can make 600+ at the wheels with just one turbo, no need for two.

You'll spend more rebuilding a 3800 than it would cost to buy a running, driving GTP and pull the engine out.

It's really easy to get that kind of power from a supercharged 3800.

Xp or s1x cam
Double roller
130# springs
Milled retainers
Viton valve seals
E85
60lb injectors
255lph pump
2.8 pulley

That will put you in the 330-350 whp range through an automatic. With a manual, you can probably get to 300whp just by switching to e85 and skipping the cam.