sobo

iTrader: (1)

Hello all, I'm currently trying to idiot proof my RX7 that i just bought and I need some helpful hints.

I've read the FAQ about this but stuff isn't adding up. So instead of guessing I want to ask some experts.

First off:
My car is a 93 Rx7, 5spd, Power FC version 2, with a down pipe, catback, meth injection, and intakes.

My goal is 11-12 PSI. SAFE.

Second off:

I just loaded in the base map. From what I've read, the base map timing is "Aggressive" for some peoples taste when boost is brought above 10 psi. I have meth injection so as far as I'm concerned I'm fine in that department, as the meth combats the knock.

I also don't want to run this car retarded rich, so I figured I'd ask you guys what I should set my PIM% too.

Now here is where I'm confused. I have no aftermarket boost controller installed. But from what I've heard the PFC can control this. After reading the guide they said that the primary should be set to .70 %56 and the secondary should be set to .70 56%. In order to get a bit more boost I set mine as .75 56% and .75 56%.

After taking a few WOT pulls I came up with a max boost of .93. Way to much. Why is this happening?

If you see a problem with any of my ideas PLEASE set me straight!

PS:
My injector duty is 94.6% and my knock was at 44.

Thanks

arghx

iTrader: (3)

Remain calm and patient my friend, you're not going to blow it up.

Pull the 4 degrees of trailing timing in the higher boost levels as I suggested in the guide. Or if you want a little bit more safety pull 6 degrees of trailing timing. Then get your AFR to about 11:1 flat under boost. It will run leaner as temps get warmer (you would need a Datalogit to adjust the air temp correction), so you need that safety margin.

I can't really tell you. Try it in 2-5% increments.

I actually prefer the PFC boost control to other controllers. This is because the PFC controls precontrol and wastegate independently, just like Mazda did from the factory. Also, when appropriate, it fully closes and fully opens the precontrol and wastegate in the same way that Mazda does from the factory as you go back and forth across the turbo transition point. With the PFC, the boost control logic is directly integrated with the sequential transition logic, which you can see in Datalogit logs. With an aftermarket EBC you have one solenoid controlling both valves and it is not synchronized to the turbo transition.

But I'll admit that I was speculating as far as what settings to use for a slight increase in boost. Every car is different. Sometimes you have to use the "duty" values to make fine adjustments and the target boost values to make much bigger changes. Put the boost back to .70/56, .70/56. Use the peak hold in the PFC to check peak boost, which it sounds like you have already been doing. Make sure you clear the peak value after each run.



Raise both duty values in 2 or 4% increments.

So start out at

Pri .70/56
Sc .70/56

try

Pri .70/58
Sc .70/58

raising both duty values in 2% increments until peak boost reaches where you want it to. Then you can use the graph mode in the Commander to look at your boost curve. Go to monitor ---> 1 channel and set it to boost. Use the graphic display to view the boost curve on a run.



The boost before transition can be altered by changing the primary duty cycle value, while the boost after transition can be altered by changing the secondary duty cycle. Without a Datalogit it could be tricky to make these small changes because you can't log what the precontrol and wastegate solenoids are doing.

Note that boost will vary with the weather slightly, but that's with any boost controller. In really cold weather (40 F ambient or less) I usually drop the duty cycles a bit.

sobo

iTrader: (1)

Well first off:

1. Should I still retard the timing even though I'm running straight meth? Like i said under 13.3 lbs (or .93) of boost I'm only getting a peak of 44 for knock. That to me isn't bad one bit.

2. I have no wide band so It's really really hard to judge how rich my car is.

3. Reading the boost screen, it looks something like this:
"
1.
Prim:.70 56%
Sec:.70 56%

2.
Prim: .70 56%
Sec: .70 56%

"
And I'm trying to figure out what everything means. Is "1." turbo one? or what the heck am I looking for?

Also when you are talking about duty you're talking about the percentage number and the decimal is the target boost correct?

Thanks

siguy2k

iTrader: (3)

So how are you reading A/F? You shouldnt be tuning or doing pulls without a proper a/f gauge.

sobo

iTrader: (1)

I'm just trying to put a base map on my car with a few edits so it's not blowing my turbos to ****.

arghx

iTrader: (3)

Think about this for a second. You're really concerned about reliability so you install methanol injection, which, while helpful, isn't necessary for these boost levels. But you didn't put in a wideband to check WOT fueling? Considering how cheap widebands are these days you need to get one.


Read the PFC commander instructions, the section on boost control. "1" means boost option 1 and "2" means boost option 2. You can have boost option 1 be the low boost and boost option 2 be the high boost. Or in my case you can have boost option 1 be the cold weather settings and boost option 2 be the warm weather settings.

Primary is for precontrol solenoid and actuator, Secondary is for wastegate solenoid and actuator. The PFC is basically two boost controllers in that way--two independent solenoids that are controlled individually, just like stock. The duty is the baseline duty that the PFC uses when driving the solenoid. It is the % ON time vs % OFF time of the solenoid, as it is rapidly pulsed like a fuel injector. The actual logged duty will differ from the baseline duty value. The PFC will take that baseline value and make corrections on top of it based on the observed boost curve and the target boost value.

Think of the duty setting as a fine adjustment for boost and the target boost as a coarse adjustment for boost. The target boost value is also used for calculating the maximum boost allowable before engaging the overboost fuel cut.

sobo

iTrader: (1)

I literally just bought the car so don't hate too much(Came with the meth), I just want it to be safe as hell to drive until I get the proper tools(Wide band included).

Thank you for the information though. Immensely helpful.