hi guys...

i'm running a PFC + datalogit on my S4 FC3S... i'm just wondering if i can use the target AFR map from mazda for the FD3S 13B-REW engine to tune my 13B-T S4 Fc3S engine

13B is 13B... isn't it?

here is a pic of the target AFR Map for the RX7 FD3S 13B REW from Mazda




any input?

 

...

No, however I can't tell you much for technical specifics as to why what you want to do wouldn't work. My guess is the problems lie in the differences between fuel delivery, intake setup, turbo setup, and exhaust setup... I'm sure someone else knows specifics.

 

You know, I'd want to agree with SpeedOfLife... but actually, having tuned a lot of cars those AFRs don't look too bad.

You'd obviously wanna get on a dyno and do some fine tuning, but yeah, those look ok.

 

is there any target AFR map from mazda available for the s4 turbo engines?

maybe my setup will help you:

3" intake in Fender
24x12x3" FMIC
2 1/2" piping
Turbonetics T60-1 turbo
apexi PowerFC
datalogit
sard 280lph pump
every rewire mod done i can think off ^^
4x1000ccm RC fuel injectors
Gauges for water temp, oiltemp, AFR, Boost, EGT (all greddy gauges)
DIY wideband + display come soon (before i start tuning my car)
3" Turboback exhaust
HKS 50mm racing wastegate
Greddy manifold
Koyo Radiator
MSD6A ignition box
SARD fuel pressure regulator set to 40PSI static pressure
Blitz BOV
etc. etc.

 

Sure, those target AFR's are great.

But getting them to happen is an entirely different story. Does the PFC actually have an auto-tune function? I didn't think so.

 

*warning - standalone retard comment approaching*

How hard would it be for a standalone to have an auto-tune feature or do most have them? Seems like with a wideband o2 it could be measured in real-time and compensated?

I know, I'm retarded...

 

Well, not many have it actually. I believe the AEM EMS, Hydra, MoTeC and Autronic are the only ones.

It basically allows you to choose a desired AFR for either a boost pressure, or an RPM range and then simply adjusts to suit directly off the wideband. Its great for many scenarios such as changing engine conditions (wearing out, losing compression) where its not as efficient as when it was tuned and will require more or less gas to create the same AFR. The ECU will adjust on the fly to suit it.

But really, its a cadiallc feature. I know a MoTeC or Autronic ECU with this function will be north of $3,500 for the ECU only.

 

^^ Good to know! Thanks for humoring me.

 

Megasquirt has an auto tune feature; you drive around and data log, then feed it into the program with the desired AFR and the program maps it out.

It doesn't run real time, that could be disastrous, it only reads off of data logs.

 

Wolf3D EMS does auto-tune similar to the MoTeC and the Autronic for $1500USD.

 

so, do you mean those posted AFR's look great for my s4 turbo or generally are a "great idea"?

the PFC doesnt have an autotune feature

but i have a nice exel sheet vom the datlagoit usergroup... you copy your target AFR's in, your logged AFR's, your actual injector + fuel map and voilà, you get your modified injection/fuel map out of the file so its a copy/paste thing... you only need some time, a rich basemap and a good wideband hoocked up to the datalogit

 

FD twins probably/almost certainly move less air than your 60-1 but you could use it as a starting point.

 

i only dont want to blow my engine next seasion should i add +10% to this target AFR map to be on the safe side?

 

Yeah megasquirt has autotune and you can make one for less than $300.

 

Why do you have a lower AFR during high vacuum and a higher AFR during low vacuum? Wouldn't the higher vacuum AFR be even leaner then 14.5?