Hey all! I just picked up an 85 GSL-SE. I am curious as to the issue of using the stock fuel injection unit with a full exhaust system. Will this setup work poor, fair or excellent. Also, how will this setup compare to using carbs with the exaust? As you may know, I don't have much tuning knowledge....if any body can give me advice and wisdom regarding this setup, it would be much helpful.

 

Works GREAT. Make sure you get the right exhaust (Racing Beat) designed for the 6 port engine and with the correct pick-up tube though.

 

I'm currently running the stock EFI sytem (ECU, injectors, ignition, etc.) with a stockport 13b, Racing Beat header and presilencer, and a Racing Beat PowerPulse rear muffler. As long as you get the correct part numbers to include an O2 sensor bung, and the presilencer that has the ACV inlet/'6'-port actuator tube, you're in good shape and will get excellent performance results with minimal hassle.

The ECU accounts for the increased exhaust flow by automatically adjust for increased incoming airstream via the Air Flow Meter (AFM). The AFM does not have to be adjusted, and the fuel injectors provide plenty of fuel within their pulsewidth to accommodate the headers and freer flowing exhaust.

As to the ease of installation, as long as you're using RB parts, you can leave your '6'-ports intact, leave your stock ACV and Air Pump intact, and it is a minimal hassle to swap back and forth for emissions testing - which I do every March.

In the comparison between fuel injection and carbs, there are 2 camps; I believe that fuel injection is the evolution of intake systems, providing increased horsepower output, increased fuel mileage, and better air/fuel management when running a closed-loop system using the O2 sensor to gauge A/F mix - with this comes a bit more complexity, but what you gain in HP and reliability more than makes up for the 'perceived' complexity. EFI makes sense and rarely needs a 'tune-up' to maintain peak performance.

OTOH, carb people see the simplicity of the carb as comforting, any many will tell you to go with a carb as soon as possible - this is only because they know carbs better than EFI. With a stock engine, with stock intake and even modified exhaust, you will get better performance with EFI than all of the Nikki carbs, and most of the aftermarket Webers, Dellorto's, etc. Most of these aftermarket carbs are more complex to setup than you'd think (air bleed jets, idle jets, accelerator jets, etc.), and require maintenance and tuning to function correctly.

Make your own choice, but you wouldn't be going wrong to leave your RE-EGI EFI system in place through your exhaust modifications. HTH, and flames are expected...

 

At the RB site it only shows the one for th e -SE, does it have all associated stuff, bung and O-2 or is that hidden?

 

That which is cheap, inherently ends up being more expensive.

The 6 port Racing Beat exhaust system works flawlessly.

Sometimes simpler is better.

EDIT: Hey, you edited yours!!

 

that's all RB has...

but if you go over to the Mazdatrix site they take the RB one and put the return air & O2 hookup on it..

 

I had three train of thoughts going on, so I killed the first. The second was what I edited. Then I found the -se presilencer (RB) site, and noticed it was only $18 more than the one for the system. What about the O2 sensor? Does one have to piece mill it together? And isnt the Mazdatrix just the streeport RB? (looks like the same damn pic) with the exception of the bung and O2 at MT

 

directfreak,longduck,rx7gslse and the rest...thanks a bunch for the replies and reassurances. So far everybody has had satisfactory results from this setup. I am now more than likely going to do just that. This way I can save on not having to buy carbs. Speaking of the EFI system, Does it need any sort of service or maintainance because of it's aging? Would it be benefitial to have the unit's injectors cleaned or replaced??

 

cleaning the injectors is a very good idea. send them out to have them flow tested and cleaned.

 

add me to the list.....

smog less...........full RB exaust.......

lots more power..................

But do something to your intake.........K&N or a cone filter set up.....Loose the box........

 

$700 for PIPE!!!!!!! If you can weld then buy some U bends from summit and go to town.....Don't mess with those 6ports. I removed the 6port sleeves and noticed ZERO low end loss and a good high end GAIN!! I just can't see paying that much for any exhaust......

 

It's more than "pipe".

It's a true dual exhaust, bolt-on system front to back w/header, twin pre-silencers and muffler.

It fits perfect, almost anyone can install it, and it doesn't fall apart or rust badly like do-it-yourself jobs often do...

AND, it looks completely stock from the rear.

Best investment I ever made in my car.