Well I'm going to add some goodies to my S5 N/A and going to mess with it so I don't screw up when the motor goes in. Right now my motor is 100% healthy with just a cone filter and straight 2.5" exhaust with a single high flow muffler. I'll keep it and have a downpipe custom fitted. And an ACT pro lite TII flywheel and TII clutch. Oh yeah it has a TII tranny and shaft. But a N/A rear end. The parts I'm getting will be used and then put into the turbo motor I'm building once this N/A dies. So this spring I'm going to pick up a haltech and new injectors. Along with a fuel pump and a new ignition system. And 4.33 rear gears (because I'm using 3.90's) also. I'll get my practice and experience messin with my N/A first. If properly tuned on stock ports could this motor push 200hp at the flywheel?

 

if you plan on starting to push big #'s then you might wanna stick with taller gears.. less time spent shifting and more time spent accelerating..

and you'll be able to take more advantage of your power curve

200 HP on stock ports while N/A or Turbo??

Frank

 

i would say about 150 to the wheels with that set up

 

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Here's an RX-7 that got there (ported):
http://www.astro.psu.edu/users/jwise/beast.html

This one is pretty close too (not ported):
https://www.rx7club.com/forum/showthread.php?t=269541

 

200hp on my N/A motor. I'm shooting for 350hp on a turbo motor. What sucks is that my friends '87 TII with a sponge filter and almost no exhaust pushed 177hp at the wheels. Thats why I'm going turbo. I'm street porting a S5 TII motor and bolting on either a T04 or maybe even a T56. I want 350hp. No more, no less. I just want to have fun with my N/A motor because it looks like its got a few years. Wouldn't having a smaller rear gear and a light flywheel along with good gear oil decrease my power loss through the drivetrain?

 

For your n/a exhaust u can just use this if u wanna:
http://www.rx7.com/store/rx7/fcexhaust.html
http://www.rx7.com/store/rx7/FC25racepipe.html

And for your TII motor use the T04. I have a friend that has one w/ 408rwhp.

 

I already ave that pipe on hehe. My exhaust consists of a stock manifold, Bonez straight pipe, custom 2.5" piping to a single magnaflow muffler. The muffler is pretty big with a 3" outlet but fits nicely and sounds really deep and smooth. Odd my car is straight piped and not even loud. That resonator on the Bonez pipe sounds nice. Or I could keep my N/A and go full bridge. A hell of a lot cheaper.

 

How can you say 150hp when thats the stock numbers! i mean adding some kind of exhaust and intake is going to add Hp, not keep it the same. Or are you talking rwhp?

 

Hmmm, very interesting. He ran a 14.9 on his "ported and prepped" motor. I ran a 15.3 on stock port with tons of wheel hop and launching problems. In fact, if I had been able to get my 60' times down to 2.0 I could've been in the high 14's (14.9ish) and 2.0 isn't even that amazing. Since then I've done a little more porting to the intake manifolds, ported TB, CAI, and some preventative measures for wheel hop (pinion snubber and solid diff mount) PLUS ported/rebuilt my motor and added an aluminum flywheel. I'm really curious as to where I stand now, I might be running some pretty good numbers for n/a, gives me hope

 

Or he could be at high elevation. Here in Utah N/A's don't run lower than 16. My car pulled a 1.92 60ft but ran 18 flat because my ports weren't opening. And a 3.90 rear might also be to blame. TII's usually run high 15's and low 16's stock here in Salt Lake. A 14.9 at high elevation is pretty damn quick. Dyno numbers are kinda odd. Like I said my friends stock '87 TII pulled 177hp at the wheels. And I guy I know has a ported S4 N/A with a TB mod and it only pulled 126rwhp.

 

Also consider loss through the drivetrain. And ambient tempatures when on a dyno.

 

200hp at teh flywheel shouldnt be too hard on an N/A. If I get mine running right, it should have about that much.

 

My friend has a street port, 6 port 13B with micro-tech FI and it pushes almost 250hp at the flywheel, 226 to the ground.

 

WOW, thats pretty sweet. Tell us more about what kinda mods he has goin on there.

 

not this is crazy!!
https://www.rx7club.com/time-slips-dyno-128/91-coupe-dyno-345460/

 

That must be one hell of a street port. I thought you had to go with at least a half bridge to get those numbers.

 

Probably a really agressive one, I wish I had gone agressive on my primaries. I just did a mild port on them to hopefully have better low end driveability and idle, but I ported the crap outta the secondaries. I'll dyno it after the break-in is over and see where I stand, hoping for like 180-190 rwhp and mid to low 14's.

 

See I asked my friend about street porting a N/A. He has done about everything you can with RX-7's. His pride and joy FD puts down 730hp on the stock drivetrain and his interior is untouched (except a roll cage and 6 point seat belts.) He said its pointless unless you plan on upgrading the entire fuel system along with igniton and high flowing exhaust. Made sense seeing as if you port a stock motor and leave the rest untouched, you aren't changing the air/fuel mixture at all. He said maybe 15hp at best on just a port alone. On a turbo however you run more boost and a street port makes a huge difference.

 

i think i should be around the 200 mark what do you think???
1/2 bridge, no emissions, no 6ports, alum fw, act clutch, msd, safc, mindtrain header, straight pipe, c/s exhaust, ported manifolds and tb, tii pump, tii injectors

lol how am i doin???

 

i am talking wheel HP