Well i have been thinking about and wanting to do this swap for a couple years now just because it would be an extremely fun fast car that will get over 30 mpg. The 3.8L V6, is supercharged and making 210 bhp at 4000 rpm, and 315 lb-ft of torque at 2600 rpm, at 12psi. There are many people after doing the exhuast and headers, plus a 10% overdrive on the super charger and a few other things, are making over 400lb-ft of torque at the wheels, and over 290 hp at the wheels. And with that power they push the 4200 pound thunderbird down the 1/4 at around 12.3-12.5 at around 110 mph. So that engine in a light weight 2500 pound rx7 would be rediculous, and then engine doesn't even weight much more then a rotary engine.

 

Unless you are ready for lots of custom fabrication, i'd say just go with a V8 swap. There are already kits for it. The 302 H.O already makes that much power N/A. If you add the pulley for more boost on the S/C and "a few other things" kiss that 30 mpg goodbye. If you have skills to fab up everthing, and lots of time for trial and error, DO IT. I would love to see that swap in a first gen. Good luck on what you do.

-Austin

 

290 RWHP and 4200 lbs = 12.3?

That math seems a little off.

Regardless, it would be an interesting project.

 

Well i already have done a 302 swap into a first gen, and that only took about 2-3 days to have everything mounted and fitted, and to build a headers that fit. Also most of the SC guys with pully kits and a bit larger fuel injectors are still getting around 25 mpg on the highways so i figure taking off almost 2000 pounds should bump that up a fiar bit

I know the hp to 1/4 time ratio seems way off, i think it is just because off the massive torque the engine makes at such a low rpm compensates for the heavy weight

 

Eh, perhaps. I build/race Grand Prix GTP (M90 3800s) and make torque numbers very inline with the S/Cs and more HP, and those times still seem optimistic. Regardless, it's a solid platform and would definitely be fun in an RX7.

 

Well even sticking a stock SC engine in would be fun with all that torque at such a low rpm, probably would be awsome for drifting.

 

Yes it would be fun. And probably real fun for drifting. That's what the purpose of my 5.0 swap is, dreeft ****!