I have the Mazdamaniac upgrade to the Greddy kit with the Cobb Access Port and I've had nothing but trouble getting this thing running properly. Does anyone have recommendations for a local (Columbia, Baltimore, etc...) speed shop or someplace I can take it to that has experience with turbo'd RX-8s for some help figuring out what's wrong with it? Or if you are a local owner that either has the same setup or knows a lot about this stuff and can help can you let me know. Appreciate it!

Thanks!

 

Sorry to hear about that...what kind of problems are u experiencing? there should be threads that will most likely explain your troubles.

 

i have the greddy kit with cobb ap. maybe i can help out.

 

intake/maf is most likely the problem. The greddy intake isn't designed for properly airflow across the maf sensor. So it's going to bog down due to the pcm adding too much fuel.

 

well, let's see. We have everything installed. Been driving the car but haven't been able to get on it much because when we log our AFRs are peaking too high under boost. We sent a log to Mazdamaniac and finally got a new map for the AP and loaded that and now it's even worse, higher AFRs. When asked MM said that he made the map super rich and we should be seeing 9s, not 14s.

I have no idea what the problem might be but I'm scared I'm going to blow the engine testing it to keep doing these logs

We were thinking maybe we put the injectors in the wrong place but we're 99.9% sure that's not it (but we're going to check again).

Here are our logs just to show what we are seeing. First one is from a few days ago which we sent to MM, the 2nd is after he sent back the new "richer" map.

Some more details on what I have...MM's kit to the Greddy Turbo, Cobb AP, manual boost controller, Innovate LC1 WB and Innovate OT1 to log.

Do you think the intake/maf would cause this type of problem? We plot MAF on the chart below..does that reveal anything?

Purple is AFR (from the LC-1), black is RPM, green is throttle, and red is MAF

 

Your MAF reading in boost look perfect.
Adding fuel to the calibration actually took away fuel (I put in so much fuel that it should be rich-misfiring), so my first inclination is that you got the P1s and P2s mixed up or their connectors misplaced.
Next possibility is the fuel pump or the pump speed resistor.

You should also verify the proper function of the SSV, VDI and APV.

Seeing as how there are several people running around with the exact same setup as you that are not having this problem, it would appear that there is an issue in the setup/operation of the fuel delivery system.

 

Looking in the shop manual it looks like the APV might be hard to test. Any tips there? I'd hate to have to pull off the entire intake manifold to check that. Looks like we can check the SSV and VDI a little more easily (because they are visible) by doing some RPM checks, correct?

How can we test the fuel pump operation?

 

http://www.pfsupercars.com/

if you want a local professional to work on it. they do a lot of turbo rotary work.

 

You can test them all by free-revving through the full RPM band while parked.
The APV has a cap over the drive armature that you can remove and watch the thing turning.
The PCM also runs all of the valves ever certain number of power-downs.
I think the number is in the FSM.

You can put it in test mode by shorting the relays.
That is also in the FSM.

Yeah, Ray is a good guy. I don't know how much RX-8 stuff he does, but he knows what he is doing.
He's in Frederick, so it isn't too far from Laurel.

Did you try the last calibration I sent on Friday?

 

Jeff - Thanks for the info. We'll do some more reading in the shop manual and see what we can find. We didn't try the map yet because we're pretty much certain that we have some other problem that the map won't address.

And, kersh4w, thanks for the shop name... we'll look into that if we can't make any headway.

 

Try it anyway. I am experimenting with injector scaling on your calibration and it will help pinpoint if something is switched.

 

ok, we'll load it and send you the log in the next day or so. thx.

 

Jeff,

Any chance you could elaborate on where this cap is? Is it on the connector end, or is it on the manifold side? I see a gray cap that looks like it would come off, but it looks like it's covering a very small port or something, so my guess is that's not what you're talking about.

I was able to verify the correct operation of the SSV and VDI, but the APV isn't so easy.

Also, I was thinking of cutting the fuel line near the upper intake manifold and inserting a brass t-fitting in order to connect a fuel pressure gauge. Is there anything wrong with doing that?

Thanks,
Ken

 

PFS they're the best.... I've been there, top notch shop, lots of Rotary experience,,,