Tomek6

yeah. Swap a 13B into an FD/FC from a Cosmo and you're golden. :thumbsup
and your car will still handle/corner nice. No heavy *** engine ruining ur weight distribution.

jdmsteR

i think you mean the 20B? 13B is what alrdy came in the rx-7's.

B6T

No Tomek is right... the 13B came in the Cosmo. The 20B also came in the Cosmo but in a rare model trim. The 13B from the Cosmo is the best one to get... it's usually referred to as the 13BRE, because that is whats cast into the intake manifold.

v8mike

LS1 into a 3rd gen adds a whopping 40 lbs to the front end. REALLY ruins that weight distribution....heheh.

B6T

I agree that 40lbs is barely noticable, thats weight could be offset by moving the battery to the back of the car and by removing some unnecessary accessories from the engine. But what you fail to realize is that with a rotary engine all it's mass is mounted way down low in the chassis which keeps the cars centre of gravity low to the ground, which ultimately pays off in handling. That's one of the advantages of the rotary, it's lightweight and compact size allows it to be placed down low and behind the front axle line (technically making the RX7 a mid-front engine car). With a V8, the engine is mounted much higher in the chassis (hood interference is one of the problems with the V8 swap) which raises the centre of gravity of the car, which has a negative effect on the car's handling. On the other hand, this does increase weight transfer to the rear wheels on a launch, which I guess helps out with drag racing, which is what most people who swap V8s into RX7s seem to be interested in.

jdmsteR

what's the difference between this 13BRE that came in these cosmo's compared to the 13B n/a like in a fc32 gxl, what about the trannies, what year did these come in the cosmo's?

B6T

I don't know all the exact differences but it probably has different rotors (different CR and weight), has 4 ports as opposed to your 6 port engine, maybe a different apex seal material (steel vs cast iron), electronic oil metering pump, etc etc. I'm just guessing, but those are usually the main differences between the engines. I've only been working with rotaries for the last 5 months so I haven't learned everything about them yet.

Tomek6

Thats exactly why I love the RX-7 and its Rotary engine so much. Altho drag racing is fun. Id rather have a nice circuit racing car.

Tomek6

The 13B-RE that came in the cosmo has the same turbo setup the 20B has and makes a bit more power than the FC3S motor. I believe the engine code for the FC3S is (13B-REW) All the cosmos came with a 4-speed semi automatic. (correct me if im wrong) They were made between '90-96. Which would make it legal to import now. :lala:

trinituner-EL

just go with a Pulsar SR20DET with NOS and build the ultimate sleeper like this

B6T

No the turbos are different. I've seen both 20B turbos and 13BRE turbos side by side and they aren't the same. It does make more power then the FD 13BREW, which means it might have bigger turbos, but they aren't as big as the 20B turbos. I think you're right about the Cosmo engine, the ones I saw were all automatics. The engine code for the FD3S is 13BREW, the code for the FC3S is 13BT.

Tomek6

I know the 13B in the cosmo has the same "sequential" turbo setup as the 20B. I dunno if the turbo's are bigger on the 20b or not. Probably are. The 13B from the FC3S is a single turbo motor.

DustinS

SR20DET in an rx-7.. ive looked into this for a 240sx but in an rx-7...so should stick with stock rx-7 engine? no V8 swap.

trinituner-EL

some guys back home put the RB26DETT in the seven's but... the best is a turbo rotary with spray..lol

v8mike

http://videos.streetfire.net/Player....84B50D64C5&p=0

LS1 swap into a 2nd gen.