Why not do a header? Who told you that? And what was their reasoning? Just curious....

 

Well, on Racing Beat they say it's not worth it if you still have fuel injection. Very mild gains I guess.

 

Thats interesting, it made very solid improvements on my car. I made 2 tenths in the 1/4mi to prove it to. And I even have a cat on there, with stock exhaust piping from the Y on back.

 

My numbers on the '90 werent all that bad, considering the minimal number of upgrades done to the car. Yes i would have liked better results but I was satisfied with what they were. Hopefully getting a decent cat-back in the near future and im definitly thinking about an AFC now.

 

Brian, I think they look low relative to mine because a stock 90 has 16 or 18 (cant remember) more horsies. Subtract a 15% loss and you should be about 14 higher than me with the same mods. Considering you have a SP it should be closer to 25 higher IMO (~155RWHP, ~182FWHP). Those are conservative estimates too. I really think you should be ~190 flywheel. Does a 30 HP increase really take more than this?!? Besides, your car kicked a brand new (200HP) Prelude's *** .
Anyway, I think the cat back, and since your getting lots more fuel, the AFC will make a big difference.

 

I took a 1986 Rx7 to the dyno. Street ported engine, bigger secondary injectors, intake and some really crappy headors, stock cat back and made 152rwhp@ around 5500rpm. It was a while ago, about 3 years ago but I could remember before the 6 port actuators opened the car was at 132rwhp, as soon as they opened the engine pushed the extra power. My question to you is: did you check to make sure your 6 ports are working? currently Im building a 90 N/A engine and Im looking for 200rwhp Im going to improve the 6 port gas flow, alot of room for some extra power in does restrictive ports..

 

Just to add some info but Chris at Rotary Performance in Dallas has an n/a S5 ported engine in his convertible (heavy car) that does just barely under 200 rwhp. It is still a 6 port and still has the actuators. He is also running the stock computer. Obviously he has added many other things. Not sure about piggy back computers or not. Don't know the exact full extent of his mods (he won't tell me!) but I know he doesn't have nos. I have an old Pettit Racing catalog that gives specs on a streetported 6 port motor that is rated at 235 fwhp at 8500 rpm when using a Haltech and stock intake. I wish I knew exactly what was possible with the stock intakes system.

 

There was a thread in the Improved Touring.com (SCCA race class) forum related to this. They did a little survey, and found fellow racers making at best 187 rwhp with their motors. Speedsource claims 175 for their built motors, but these guys had seen 170 from a boneyard motor, and 163 from the SS. I don't know the rules exactly, but I know internal mods (ie. porting) are not allowed. I think they're running factory fuel injection. Exhaust is open to creativity (headers and straight pipe, mostly).

Curtis
'86 GXL autox'r

 

Where Is Wozoom with his dyno results?

 

You had to give me a chance to post them! LOL! Here you go:
http://angelfire.com/wizard/cars/index3.html

That is a scan of my best run. 166.1 RWHP and 123.6 Ft/lbs. Not bad considering I'm still running a 4 year old cat, full emissions and an airpump!

Looking at my graph shows that I have a terrible ignition break up above 5000 RPM. New plugs helped and we also replaced the leading coil on that last run. (You can see the blue line is less bumpy) I need to replace my plug wires and I'm thinking about trying some blaster coils on my MSD.

Dave at KDR figures I'll see easily see 170-175 RWHP once I clean my ignition up.

Jeff
my mods:
http://wozzoo.tripod.com/stable.htm

 

To add onto this thread, I'd like to link to a new post I started:
https://www.rx7club.com/forum/showth...84#post1005984

This is why you should never wire your 6-ports and VDI open!

 

These are some Impressive results for an n/a. Good job bro.

 

Well, I just found a large exhaust leak at the manifold-downpipe joint. I'm probably losing alot of backpressure there, enough to screw up the auxiliary port opperation.
I know they opperate properly to pressure because I had a some problems with leaks and fixed it this summer, but I'm sure when they are opening up. I know they open up all the way at some point because I did a little trick with a wire tie on the shaft of the actuator to see how much it moved.
I'll fix the leak soon, I also installed rebuilt secondaries, and Brian bought a S-AFC. We're planning on another run sometime soon, possibly this month. Hopefully we'll get these #'s up where they belong.

Is that The Jeff Wozniak I hear, or is that another Jeff from PA who has a silver rex, and refers to himself as wozzoo?

 

The one and the same...Man, Myth, Legend in his own mind!

 

Thats some realy good power! Very nice. Well guys, October 12th, the ol' n/a 90 is going back to the dyno! Hoping to run 175+rwhp this time! CJ

 

Jeff, whatever happened to the old website? You had some of the best info on the net there.

 

Zach,
To much maintenance... I finished college and got a full time job. Real job = Real money = More mods! I've changed so much on my car in the last year, that the website couldn't keep up! What else? I bought the 89 GTUs and I'm engaged to be married in less than 9 months! Lets just say I'm busy! ;-)

Someday the site will be back...

 

thanks for the props!

Keep us posted on your progress. I'd like to see you hit 175. I know that's my goal. I think I can do it with some tinkering.

 

I too should be seeing some dyno results soon. As Is now. Followed by cat removal, porting the manifolds/TB Mod and the S-AFC. Then as a winter project (or even sooner) should be Nirousing my n/a. More to follow...

 

Here is a picture of my 166.4rwhp run....can't seem to find a 167rwhp...but .6hp is'nt that much. Also, from what i gather....depending on the dyno, your hp levels will fluctuate. CJ

 

Its amazing to see that your graph is almost identical in shape to mine! The torque curve is so close...It even has the same dip in the middle around 4000 RPM!

 

He stole your graph!

Hey cograts on the job, woman, ect. Now get back to real life and write some more how-tos!
Yeah, a real job would be nice. Just a couple more years...

 

Run some CDI boxes - both graphs exhibit ignition break-up at the top end, the lower one moreso.&nbsp Use NEW plugs on the dyno, not 2000 miles old ones, not 1000 miles ones, not even 500 miles ones - NEW.


-Ted

 

I don't know if you're talking about mine ReTed, but i'am running a Hi-6...and had some fairly new plugs in it. CJ

 

Nah, it was for the first two - "Brian" and "Zach"


-Ted