Ah, I see my next mod. Maybe that will help the break up/misfiring I am getting at 6200-6800.

Hey, once set, could you just shove the hand held unit under the ECU floor plate so that it was out of sight?

 

Thats awesome! but my other concern is what my exhaust shop said, that running too rich will burn up the cat... with the performance settings on a S-AFCII will i burn up the cat or decrease its life? or was the guy at the shop just full of crap and i shouldnt worry about it?

 

Thats awesome Rarest!! I need to get my car to the dyno to get it tuned real bad.

 

damn, I never got to dynotune my car.....but the GTUsII will be, with all the mods in my old RX7 llooking forward to it. Good job on freeing up the HP.

 

reted: the its car runs 10:1afr on the stock ecu, the afm maxes out around 7k.

 

there are a few mods and tweaks you can do for some more hp...

 

Nice work..............
I see your Ne points are very close together - since you're concentrating on the +5K range, but if you were to spread them out, say every 500 rpm, the SAFC will still interpolate the intervening values, and you'll get control over a broader range of fueling..........
fun toys, they are.......

 

It was fun watching the tuning process for the couple of hours they were on the Dyno.

Though I needed some fresh air after we were done with all the toxic fumes the Rotary was kicking out. Luckily I just dropped the top for awhile.

The biggest dissapointment was not getting to Dyno my car and see just what the F22 is putting out.

 

if the misfires are from an overly rich mixture it could be a bunch of different things; perhaps a problem with the old AFM? a vacuum leak? or simply time for plugs and wires if the ignition is not capable of igniting all that air and fuel correctly...

 

Does the S-AFCII eliminate the AFM? I'm thinking it doesn't since its a piggy-back system. With that in mind I wonder what kind of numbers you could get running a properly tuned stand alone EMS like a Haltech or Microtech? That could put RarestRX close to 170HP if not over it.

 

Congrats! 159 RWHP on a STOCK PORT motor is VERY IMPRESSIVE!

EVERYONE: 12-15 RWHP gain on an NA is NORMAL with the S-AFC. We've been telling people that for years now.

Looks like I better get my *** in gear. Once you get a purpose built street port motor, your going to be flying. For example, my best dyno pull with my ported S5 motor was 166 RWHP / 123 Torque. But to be fair, that was with a cat installed. Now that I have the RB silencer, I'm looking for 175+ RWHP.

 

Icemark: We wired the unit to go into the glove box. Out of site out of mind

Slvr7: Your right we could have done that for this session I wanted to concentrate on dialing in that part of the cars fuel system. We were originally doing more general Ne points example 5400, 6000, 6400 (remember it does it at 200 rpm point increments). But we found the best over all smoothness of the car is when we separated it out. As always there will be further tuning later down the line. Your never done you just take breaks .

MPM: No the S-AFCII just modifies the AFM signal it does not delete it. I think 170 might be possible but that would probably be the max on a stock block. The dyno is such a bitch I would more realistically say 165 whp.

- Dana

 

Yo,


Thanks everyone for the props! I'm pretty stoked we could pick so much up with the S-AFCII...definitely the best and most economical mod I've done!

RETed: I'm running the stock injectors and fuel pump. I don't know why it graphed like that...it doesn't feel like it's missing. I will email you all the runs so you can look at them.

Let me re-iterate all my mods:

Stock block
Stock timing
Stock plug heat range
Stock fuel pump
Stock injectors

Racing Beat Road race header going into the true dual setup

Intake: Apexi super intake (don't ask)

Ported TB, secondaries removed, no coolant flow.

Mildy ported Upper, middle, lower intake.

SAFC-II

Now what do you guys think of my AF ratio? You can see we didn't have time to pull the curve up to 13:1 like the 1000-6000rpm range. It's more like 12.5:1.

Do you guys think there is more to be had by leaning it out to 13:1 all the way across? Or even going 13.5:1?

PP13BNOS was crazy with this and went 14.25:1!!

I just would like all the rotary guru's opinions on the AF range...if it would be worth going back to try and lean it out even more...

Thanks again and I hope this thread helps all the guys trying to get the most out of their NA FC's!

Kevin
1989 GTUs "Feeling much faster!"

 

I see no reason to go for anything higher than 13-13.1 across. You're going to want some safety for those super hot track days. (Or that occasional bad tank of gas) You could pick up a couple HP points on the low end with some more tuning, but I wouldn't make a special trip to the dyno...

Next thing I would try is bumping the timing. Put the CAS at +5 degrees and you can see another 5-8 RWHP gain.

 

What about an upgraded ignition system?

almost every bolt on imaginable.

 

dude someone needs to make a thread like this with a turboII. this will give me some incentive to go out and actually try to tune mine.

 

It should be a given on a turbo. If you mod a TII and don't tune it, your an idiot. And a blown motor is in your future.

For an N/A tuning is a plus, you will get decent gains, as shown is this thread. Tunning for a TII is less bout squeezing a little extra HP, as it is about a margin of safety. You can't run those lean numbers on a TII it will blow, infact you can't even run a TII at optimal power A/F under high boost.


-Robert

 

Congrats!

 

what is a good AFR to try to tune a turboII to with intake/exhaust mods like i have?

 

Stop trying to Hyjack Kevin's thread!

Damn turbo guys...

 

damn i got the regular 13b..meaning i dont have high comp. rotors. i wonder what the differences would be other then total amount of RPM?
like i said before....props.
i would try and get more aggresive with the timing.

 

That is really cool. I need to try some new things when I rebuild my daily driving Fc. hmm

 

nice work mine is going in soon

 

Both turbos and NA's run rich on the stock ECU.
The NA's are typically very rich across the RPM band.
The turbos are typically very rich in the middle of the RPM band, 3500RPm to 5kRPM.

Both can easily be leaned out and produce very significant power gains.

Hey Kev, I'm looking at the graphs right now.


-Ted

 

Actually, you boys still have quite awhile to go. I did my dyno runs on a mustang dyno. They are around 10% lower than a dyno jets numbers.

What realy made me give up on the hp chase was the afm. After all the work I did to my car, it would max it out anytime after 6,500rpms ish. The only thing left to do at that point was a standalone. I did'nt want to go down that road as I was realy only into the car about $1700. I ended up trading the car in on my 8.

Yeah kevin, my car was setup where it made peak power. Any leaner and the car actually started loosing power. I put 25k miles on it that way, and never had a problem running 87octane. With alot of 1/4 mile runs too. CJ