13BT_RX3

When I had a 12A street port I got some more airflow out of a stock carb by running a spacer under it that joined the primaries together and joined the secondaries together at a point. I kept the joined primaries separate from the joined secondaries. The idea was if each rotor could be fed by all barrels of the cab instead of just two it would be getting double the cfm out of the carb. I also ported the manifold a bit. I needed to jet it a little bigger. I also liked it with the spring removed from under the vacuum secondary diaphram, better response. Vacuum started to build at ~7000rpm with this setup from what I recall. This was about 6-7years ago.

SerpentKing

So, I got my rebuilt Nikki on. But, my car doesn't run.
It appears that the front primary (toward the front of the car) isn't getting fuel. Could my float be stuck? Could the problem be in the banjo bolt that holds the metal fuel line on?
I need to fix this quick. Any help?

SerpentKing

I fixed my carb problems. Then, I had a problem in my clutch hydraulic circuit. So, I replaced the master & slave cylinders, and that fixed it.

Then, I removed the smog pump and rat's nest, using the tutorial in the archives. I've got some pictures I'll post soon.
Anyway, it's long been debated on this forum as to the benefits of removing your smog pump. Let me tell you, it helps BIGTIME!

Here are my old ETs:
Average: 16.63 @ 83.6
Best: 16.53 @ 84.6

New ETs:
Average: 16.29 @ 86.0
Best: 15.95 @ 88.8

kgray

Great thread! keep the updates coming.

Acesanugal

iTrader: (5)

All this is making me want to ditch the FC for an FB...

SerpentKing

I say do it! My buddy has an FC, and I always liked them (Hell, it's the ONLY convertible Rex!).
But, I'm a huge fan of E-Type Jag's, Toyota 2000GT, Datsun 240, Porsche 356, etc.
For me, carbs and stripped down hot rods are where it's at! Modern cars are awesome, turbos are awesome . . . but this is the one I'll always want to turn wrenches on. A few more years, and the FB will be a bonafide 'classic'.
When you can pick one up for under 2K, how can you not love this car?!

Acesanugal

iTrader: (5)

Maybe when I...you know...get a real job, I'll save and buy an FB as a tinker project.

vxturboxv

iTrader: (2)

Cool write up. To bad every time you go to setup (zero out) the g-tech your gonna get different readings. Also temperature humidity etc all make huge differences. Still, a stocker 15 sec 12a is damn cool! Get that bad boy weighed!

Junia

Sounds like a good plan for the seven. This is just my opinion but with a car like yours I would restore it to factory conditions and leave everything intact. I don't know I love seeing cars on the verge of the grave yard getting a major face lift and overhaul but a car like yours I think should be restored for nostalgic sake.

rbf41182gt

nice work!!

exhaust and ignition will help A LOT!!!!

PvillKnight7

iTrader: (16)

When you do swap in a LSD dont forget to weld that middle mount (near the drive shaft) while you have easy access to it.

Jozay721

how did u get 16.6 in an almost stock fb?

Blk82GSL

Great work so far!!

I just got my exhaust yesterday, and let me tell you it does work, and very well. I used a cat since I cannot get away with yanking it yet. RB header, bonez cat, and a muffler I built myself in the garage. I have not timed it or anything, but seat of the pants is way improved. It feels uncorked so to speak. It went from barely chirping second sometimes, to always chirping, and short squeal depending on road surface. It's also noisier, but hey what's the fun of having more power if you can't sound like it? Next I'm going after the ignition. K&N filter tomorrow.


I also found that the car had many problems back when it was a daily driver. Misrouted ignition wires, bad vacuum line all over the place, ailing carb, etc....It is slowly becoming the machine it was meant to be.

glewsRx

iTrader: (1)

This guys moving at a pretty decent clip. He'll have it widebody in like three months...

t_g_farrell

iTrader: (1)

Then why did they remove them for the SE and the 2nd gen?

SerpentKing

My 12a blew the water seals and stopped running, permanently. But I've got a plan . . .


This is Ice Cold Katie, my 1985 RX-7 S. As you can see from the pictures, she's seen better days. I got this car into the high 15's before the engine started guzzling water, now my plan is for full restoration & 13's.

SerpentKing

The plan starts with a 1986 13b. A local racecar builder had it as a spare. He said it had roughly 80K miles and had been freshened recently. I bought it for $200.

BUILD COST: $200

SerpentKing

To scrape up some cash, I took the old Nikki off (the one I rebuilt myself) and listed it on eBay. I was hoping for $100, but only managed $88.
Fortunately, I'd already saved up about $2200.

1stGenJake

ive found the cheapest way to mod your rex is take the useless crap out. free hp in weight reduction.

risingsunroof82

iTrader: (3)

Sweet, it's good to see your reviving the post! I read through the whole thing, Awesome stuff!!!!

FirebirdSlayer666

iTrader: (3)

Weight reduction won't gain any horsepower but it will quicken the car. It's good to see you revived the post from the dead. When you say restore and 13's, do you mean restore the car but be making 13 second quarter mile passes? That's technically what's called a Resto-Mod. A full restoration would be to take it back to factory. Looks good, can't wait to see what comes of it

WorkmanGT

Keep us posted.

I have a question on the G-tech though. I was looking into it a while ago and it said something about plugging into your OBDII port. So I just walked away and said forget it. So, you can use it on OBDI and before?

SerpentKing

Thanks, Jones! I LOVE this car!

True. By 'restore', I mean fix all its issues. Factory stock is irrelevant at this point.

Regarding the G-Tech, all it plugs into is the cig lighter. There are a half-dozen different models available. Mine is the simplest. Picked it up on eBay for $40. I don't insist that it's completely accurate. But if it's at least consistant, it'll let me know if I'm doing something right.

SerpentKing

Here's what I'm starting with. Most everything on the car works (sort'uv).

SerpentKing

As of today, Katie looks like this.
I pulled the carb & intake off the motor, and the Nikki carburetor's been sold. I packed the RB air cleaner away, will probably sell it too.

The front bumper was tweaked from a minor collision before I bought her. So, the front end had to come off to finally fix the damage. I'll use pieces from my parts car, plus some new parts.