Okay 1st off, little background.

The motor has been rebuilt, and has less than 1000 miles on it....and we used RA seals, so the compression isn't quite there yet. It's still a little hard to start, but is better than when we first rebuilt the motor.

That being said.....I have 550's and 720's, and was using a SAFC to control the fuel. I assumed that I would have to take OUT fuel using the SAFC in the upper end (+3500), but to get the car to run good without breakup, I had to put IN fuel. We're talking about +25%. That was all good and fine....seemed odd, but was easily corrected.

Now, I've bought and installed a Rtek1.7 in hopes of being able to zero out my SAFC settings. Instead, however, I've had to put MORE fuel in. Right now I'm currently maxxing out my SAFC (+50%) to get the car to run right.

My theory is, when we put the motor back in, it's possible that I got the injectors put in "wrong". As in, maybe the 550's are in the secondary spot, and the 720's are in the primary spot. I haven't had a chance to take my UIM off to verify this, but does that sound like a good place to start? Or could there be something else being the culprit?

Thanks

 

You shouldn't really have to run the SAFC and the RTEK. One or the other!

Get a wideband, it's going to help you a ton.

 

Good call. The SAFC was there already for fuel control but doesn't do everything the rtek does, which is why I bought it. I can still use the SAFC to fine tune, but right now I'm thinking something isn't setup right because 50% isn't fine tuning.

 

are you trying to 'tune' with JUST a narrow band????? boooom

 

okay, i have asked a pretty specific question. If you don't know the answer, don't frickin' comment.

I sometimes wonder why I even post...when I know all I'm going to get is a bunch of people that don't know the answer piping off with their smartass answers that have nothing to do with the question at hand.

I'm currently searching to see if I can find the different colors of the injectors, 'cause I remember seeing them somewhere, but my 19.2Kb dialup connection sucks *****, so it's taking a while....

 

The "lower" injectors are tan in color, which by the FAQ should mean they're the stock T2 550cc injectors. The "top" injectors are green in color, and are the ones I bought off RX7.com.

The secondary injectors are the "top" injectors right?

Starting off with the basics, since I've missed something somewhere.

 

Okay, the top rail is the secondaries, which appears that I have the injectors in the correct holes.

Now if I can find the wiring diagram for the injectors themselves...like i said, searching sucks on this connection, as I download around 2K per sec.

 

Alright, so according to the diagram out of the haynes manual I have, it appears as if the primary front is brown, primary rear is brown/red, secondary front is brown/white, and secondary rear is brown/yellow.

It appeared as if I might have had my secondaries swapped, as the yellow & white stripes looked almost the same (possibly since they're 20 years old). I swapped them, and now it won't rev over 3500rpms without really feathering the throttle.

So, in the morning I'll swap back to the way I was going into this problem.


Could a fuel filter cause this issue? Could a fuel pump cause this issue? I have a walbro255 ready to put in, but really don't want to make a problem worse by introducing more new parts...

Any constructive advice would be appreciated.

Problem at hand:

Having to MAX out SAFC for car to run under load at stock PSI levels while using Rtek1.7, and 550's and 720's.

 

Check your fuel line routing to make sure it isn't kinked, and to make sure the hoses aren't attached to the wrong end of the fuel rails.

As usual, a wideband AFR gauge is no help here. What he needs is a fuel pressure gauge.

I hope you realize that sports cars pre-date AFR gauges. Don't fall for the hype.

So you are not going to comment in your own thread?

 

I appreciate it...I'll check my fuel lines, and see if I can get a fuel pressure gauge hooked up to see if I'm getting pressure to my rails.

If all else fails, I'll drive to st. louis....it's only like 4 hours away.

Just kidding...but thanks for the ideas, i'll see if I can check the fuel pressure this weekend.