Anyone have experience with ApexI SAFC II?

[TiPerformance]

Originally Posted by mischief

this is why i dont like to talk about my setup

Lack of pictures and technical knowlege might be the reason that you don't like to talk about it.

22 PSI with a M62 is going to be nearly impossible, unless you are spinning it at an extremely high RPM and then expect premature failure of parts. Even then being non intercooled you are pumping an extremely hot charge into your engine. And yet again stock compression ratio on the M42/M44 is 10:1, and adding forced induction in theory increases the compression ratio.

What are you doing to control detonation?

What doesn't pan out is that you are using a "very Large pulley" on the supercharger, why is it that everyone else goes with a smaller pulley to increase boost pressure?

Also you have your fuel pressure set to 60PSI? I hope you have a rising rate FMU or a piggyback controller to compensate or your car is going to be running very rich at idle.

I bet with 22PSI that you could give RAiMA a real run for his money

[DustenT]

Originally Posted by mischief

this is why i dont like to talk about my setup

Why wouldn't you want to talk about your setup? It seems to me that if you mount a supercharger so it sticks out of the hood, you are looking for some attention. We just want to know what you are doing, that the rest of us aren't, to get your car to run at 22psi without a problem.

You mentioned before that you aren't running a bypass valve. Does this mean that at idle you are running boost? Stock fuel pressure is about 45psi at the rail, so you should be running about 15lbs of boost at idle to use the 60psi of fuel you are feeding it. Even if you are completely saturating with gas, you must be close to 10lbs of boost.

When you say you are running a very large pulley, you must be talking about the crank pulley, right.

BMWs don't do well with more than ~8psi of boost because they rely on the knock sensor(s) to retard that timing enough to avoid detonation. At 8 psi, without the water/alcohol spray on, I see knock almost constantly. You CAN run more boost than that, but the horespower gain is almost nothing, unless you can adjust the timing to avoid detonation.

If you have some super top-secret setup that you won't talk about, it seems like a waste to even be part of an automotive forum. I'm sorry, but I have to agree with the others, this is BS unless you can explain.

[HuGo]

LoL, this thread is funny.

[Broke Drift]

Originally Posted by DustenT

Blow-off valve that vent to atmosphere are typically not used on cars with Mass Air Flow meters. When the BOV blows off, it releases air that was previously measured by the MAF meter. This usually means the car will stumble and run REALLY rich at idle or anytime the BOV releases air. Cars that respond well to BOVs (that vent to atmosphere) use MAP sensors instead of MAF sensors. The basic difference is this: A MAP sensor reads the PRESSURE of the intake tract, while a MAF measures the mass of the air as it comes in. A MAF system needs to stay sealed to work well. Some production turbo vehicles come with a sealed version of a BOV calles a bypass-valve. A bypasss-valve does the same thing as a BOV, only instead of blowing to atmosphere, it blows back into the intake tract, thus never losing any air that was measured by the MAF meter.

The Apexi unit that I had mentioned is capable of montioring the intake pressure, probably via an add-on MAP sensor. It also probably piggybacks the MAF meter to change the sensor voltage.

I had a turbo civic back in the day and I loved the BOV sound. But apparently you don't really need one unless you are running 10+ psi. If you do run one, I would try to vent it back into the intake tract, anywhere after the MAF meter.

Good luck!

i have a BOV on my mosselman turbo...

[FATHER]

I agree with Dustent, Mischief i think is not horse power gain with 22psi of boost in a m44 or m42 engine with stock component.. you have a Dyno read or 1/4 mile time, i saw some of yours videos and i think that my ex-TI with the 10psi of boost run more than your... so explain little more about your "setup"

[AzzKickr]

Back on-topic again (well ,almost): I've decided not to buy an Apexi SAFC-II unit but an ALpha-N unit instead. This will allow me to run without any air flow meter or MAF/MAP sensor and thus eliminating any restrictions the air intake might pose.

As soon as I actually have it and get it installed (and fix the other engine probs I have) I'll post results.

[pdxmotorhead]

Without at least 1 sensor(MAF/MAP/AFM), FYI MAP don't impact air flow, you will not get the most power out of the motor, and your very likely going to learn the hard lessons of detonation....

Go easy and have fun!

Dave

[AzzKickr]

Originally Posted by pdxmotorhead

Without at least 1 sensor(MAF/MAP/AFM), you will not get the most power out of the motor...
Go easy and have fun!

Dave

Sorry to say so but you obviously don't know what an Alpha-N unit is ...
An Alpha-N controller is the best way to get the most out of an egine, NA or FI. Downside is the price of such a controller and the extensive programming.

[HuGo]

Originally Posted by AzzKickr

Sorry to say so but you obviously don't know what an Alpha-N unit is ...
An Alpha-N controller is the best way to get the most out of an egine, NA or FI. Downside is the price of such a controller and the extensive programming.

Let me know how it goes, im looking for something to custom tune my car to get as much power as i can safely with a 10psi pulley.

[mohaughn]

Originally Posted by AzzKickr

Sorry to say so but you obviously don't know what an Alpha-N unit is ...
An Alpha-N controller is the best way to get the most out of an egine, NA or FI. Downside is the price of such a controller and the extensive programming.

I think it is overkill if you are not going for a full blown race motor. How much extra power do you think this engine will produce with an alpha-n unit vs. a map sensor? Probably not a lot. And not to mention if you take the car to different locations that have extreme differences in altitude, you have to retune your car. I guess if you bought really nice alpha-n controller that can accept data from an O2 sensor you can do on the fly tuning and not have that issue.

How do you plan to tap into the RPM sensor? From reading a lot about the megasquirt system the most difficult part that people have is tapping into the RPM sensor and getting a good reliable reading of RPM.

I think it is cool that people are doing different things and trying new technology but in the end an alpha-n fuel controller on a street motor seems like it would be way to much hassle.

[TiPerformance]

Originally Posted by 1996Bmw318TI

LoL, this thread is funny.

Wow way to dig up an old thread

[DustenT]

Originally Posted by TiPerformance

Wow way to dig up an old thread

Wow, way to quote an old thread...