hi guys. i was just curious what the difference is betwen our 3.8 in our bonnies and gp'* and the grand national'* 3.8 besides the turbo and it being rwd? how about the turbo? is it a turbonetics, t3/t4? cause if thats the case, putting a grand national engine, transmission, drivetrain, and rearend in a late model gm, that thing would haul some major tail! just curious, thought id ask.

The block is basically the same, but engine mounts, ICM brackets, alternator, can be different.

so basically the grand national'* engine is turned vertically and used with a regular traditional transmission whereas our cars the engine is horizontal?

The 3800 block is the same. I can't say around the rest. But it should still be close.

i gotcha. either way they both haul some serious tail. just thought id ask.

Dont quote me on this but i think the bolt pattern to the transmissions are different as well. There was talk about one of these steup'* as a possible fiero swap but the whole transmission issue was what held it up.

arent 92-99 bonnes engines vertical? I know my 3800 is

Wait, wait, no. The engine in the GN is different. The bore and stroke are the same, but everything inside has been changed. The deck height is shorter on the Series II, as are the pistons and connecting rods and their redesigned crankshaft. The heads also have been changed. How would these differences affect the outcome of putting a complete GN drivetrain into a late model car?

The bolt pattern is different, so aside from using the GN'* transmission or a similar setup on a front-engine RWD car, Fiero guys need to use the Series II 3800.

Also, the engines in FWD cars are transversely mounted while RWD setups are longitudinally mounted. Transverse mounting means the crankshaft goes from side to side while the transmission goes to one wheel and pulls a 180 to go to the other. Longitudinal mounting means the engine'* crankshaft goes from the front to the back and feeds the transmission which is parallel to the driveshaft that goes to the rear wheels.

Ohh beleave me.. We've been doing that for years. look up a guy named Fiero X on youtube. 9 seconds on a turbocharged 3800S2 His car looks like a Halloween frog but it is nasty.

I love 3800-powered Fieros! I'm not doubting the possibility - just saying that a GN engine in a Fiero is less practical. Though wasn't there one guy that used a 90º bolt pattern trans to hook up a V10 inside his Fiero? And I think one driveshaft went through the oil pan because it was such a tight fit. That was awesome!