alpineracer

hello, i have been driving around in my 91 na fc for about two years now and it is most definitely time for a power upgrade. my question is which engine would you knowledgeable people recommend. i want to get the most responsive power possible. i will be street porting whichever engine i end up getting. it will also get a full rebuild, and i am toying with the idea of going with 9.7 rotors (from my current engine). this car will mostly be seeing some good touge driving (mountain roads and canyons) and also track days when i am able to get it to the track. i am leaning towards the re as of right now, but i am not extremely knowledgeable about engines hence me coming here to ask the masters. i am looking for around 350-400 to the wheels with the capability to turn it up to maybe around 450 at max, that is alot of pwer for someone going from na though so my plans are to get the engine, have it rebuilt and ported, run around on stock turbo(s), and then when i feel that i can handle the boost upgrade the turbo(s). another part of my question has to do with the twins on the re. now i am always reading that it is a major pain to get the twins to run sequentially, however i never read that it is impossible. this would be the most responsive way to go, no? and what all would it really take? this is all part of my rebuild of basically my entire car over the next year or so.

Thank you for all your help

-Ryan

fc3sboy1

i have run both, a 91 13bt from a rx7 gtx and now have a 13bre from a cosmo . i ran the same turbo on both motors and there is alot more power to be had with the cosmo if built correct. but both motors will give you what you want.

alpineracer

thank you very much for your reply fc3sboy1 but how about anyone else? any other comments?

j9fd3s

we built a stock port cosmo powered t2 with a hybrid stock turbo and the power was nice and linear, it was a really fun car to drive.



my stock port stock s5 turbo t2 was pretty close, but the cosmo was a little sharper

alpineracer

so do you think that the street port would help then? it would make response a little better at least, correct? i think i am going to get the re. also when you say that you ran the stock turbo, do you mean the stock twins? or the stock 13bt?

Thanks,

-Ryan

j9fd3s

it was a hybrid stock fc turbo. take the twins and chuck em into the woods.....

alpineracer

i would really like to go with a twin setup though. not the stock twins but a nice upgrade. as i have said i want smooth responsive power, this is also why i am wondering exactly what will be needed to get the twins running sequentially?

j9fd3s

if you have a look at the diagrams theres basically only 3 solenoids you need to make it work. the timing isnt critical, but if you want a smooth transition its important. also if you're driving hard both turbos will always be on, so its really only best for the street

BLUE TII

The smaller primary ports of the 13BT "can" provide a more responsive engine over the larger 13BRE ports IF they are ported carefully to maintain velocity and good direction.



I had a Pineapple streetport 13BT and now I have a self ported 13BT. I kept the primaries smaller at the face of the port but with a larger port runner than what the Pineapple had and the 2ndaries are bigger than the Pineapple in runner and at the port face. All ports close a bit later than Pineapple. It is more responsive off boost and doesn't need to be as rich to run smooth.



Rob at Pineapple has told me the 13BT is more responsive than the 13BRE because of the primary ports.



I can't keep this engine off boost! It feels like the boost gauge needle is connected to the gas pedal.



BIG secondaries, small primaries pointed accross the 2ndaries and the exhaust port has just a bit earlier opening and closing as well, but is smoothed for flow as per Paul Yaw's site.



I will get some pics up now that I know that my new type of primary porting works.

j9fd3s

cool beans ian!