sutyak's turbo focus

[JeffreyCole]

Something has to be a little wonky to cause the maf to max at 3.5 volts though.... doesn't seem right to me...

Of course my MAF sensor back in the day was measured in frequency (Hz), so again... apples/oranges comparison to what you are doing.

What are your options when it comes to Speed Density converisons?

Standalone?

[Tom]

My car uses a fixed frequency reduction so in my case it would be the maf hitting a max threshold before being scaled.

In your case, it seems like its the mafia, I would try calling them.

[sutyak]

Something has to be a little wonky to cause the maf to max at 3.5 volts though.... doesn't seem right to me...

Of course my MAF sensor back in the day was measured in frequency (Hz), so again... apples/oranges comparison to what you are doing.

What are your options when it comes to Speed Density converisons?

Standalone?

I'll figure this out. Now way I'd switch to speed density and throw out the setup I have now.

[sutyak]

My car uses a fixed frequency reduction so in my case it would be the maf hitting a max threshold before being scaled.

In your case, it seems like its the mafia, I would try calling them.

I am definitely curious what Diablosport has to say. I sent them an email but will call if I don't hear back.

[sutyak]

Talked with Diablosport, and their response is "If it's set up correctly in the tune it should work". Very canned response from them with no real interest in delving in any deeper.
I'm going to try the SCT BA5000 MAF sensor. Perhaps if I run into any issues with it I'll get better support from SCT since I'm already a customer with the XCal2 and pro racer package.

[cwh19]

Has anyone in this circle used a factory style slot maf from a newer car? The resolution is much better than a hot wire style maf.

[SlowSix]

Has anyone in this circle used a factory style slot maf from a newer car? The resolution is much better than a hot wire style maf.

I'm using a MAFia and 05+ gt slot maf. Don't remember what the mafia is set to. Also don't know anything about tuning, so I guess I can't really help lol

[sutyak]

The SCT BA-5000 MAF just arrived today and I've spent this evening dialing in the low end of it. I started with the MTF provided by SCT, which basically just got it to start. The resolution is very different. Since this MAF in a 3" housing supports over 800whp and I'm only going to use half of that, imagine how tight the lower end of this is! I haven't even started retuning in-boost yet.

[JeffreyCole]

The SCT BA-5000 MAF just arrived today and I've spent this evening dialing in the low end of it. I started with the MTF provided by SCT, which basically just got it to start. The resolution is very different. Since this MAF in a 3" housing supports over 800whp and I'm only going to use half of that, imagine how tight the lower end of this is! I haven't even started retuning in-boost yet.

Just out of curiosity, what fuel pump are you running in conjunction with the boost a pump?

[sutyak]

Just out of curiosity, what fuel pump are you running in conjunction with the boost a pump?

Stock. It supports over 400whp and going by my logs I believe it.

[JeffreyCole]

Stock. It supports over 400whp and going by my logs I believe it.

I just mention it, because most in tank pumps are equipped with a pressure relief valve, that pops open at a specific pressure, defueling the motor, and causing a lean spike, and one hell of a stutter.

I have no experience with the focus fuel pump, but I thought it might be something worth looking into if this doesn't work, as 19 psi is most likely 62.5 lbs of fuel pressure, assuming a 43.5 base pressure.

That seems like a lot for a pump not really intended for a forced induction application.

Just food for thought if this doesn't solve the problem.

[sutyak]

I just mention it, because most in tank pumps are equipped with a pressure relief valve, that pops open at a specific pressure, defueling the motor, and causing a lean spike, and one hell of a stutter.

I have no experience with the focus fuel pump, but I thought it might be something worth looking into if this doesn't work, as 19 psi is most likely 62.5 lbs of fuel pressure, assuming a 43.5 base pressure.

That seems like a lot for a pump not really intended for a forced induction application.

Just food for thought if this doesn't solve the problem.

Good info. I hadn't heard that before.

[JeffreyCole]

Good info. I hadn't heard that before.

Do you see anything abnormal in the log with the afr's when this happens? (Assuming you have a logged wideband, that is).

You should see it shooting lean during the breaking up.

[sutyak]

Do you see anything abnormal in the log with the afr's when this happens? (Assuming you have a logged wideband, that is).

You should see it shooting lean during the breaking up.

Fuel cut is essentially what happens. Fuel pump voltage drops rapidly and afr spikes but with no load, and no knock.

[sutyak]

Look what followed me home...


I bought it used. According to the serial number it's a GT3076, except the compressor wheel is actually an 82mm billet wheel with a matching 82mm HTA compressor housing. Imagine my surprise seeing that shiny billet wheel when I was expecting a cast 76mm. That would make it a GTX3082R, if there were such a thing.
Now I need to decide whether to run it and put up with a bit more lag, or step down a bit for something a bit more fun on the street.
The 82mm wheel should push around 68lb/min. That's a good bit larger than I was going for, and definitely more flow potential than I'll use this year with this fuel system.
If my goal this year is 400whp, then the GT2871R will push that maxed out with a great power curve. The GT3082 would hit that easily, but I'm afraid the power "under the curve" will be less with the slower spool time.

[JeffreyCole]

Look what followed me home...


I bought it used. According to the serial number it's a GT3076, except the compressor wheel is actually an 82mm billet wheel with a matching 82mm HTA compressor housing. Imagine my surprise seeing that shiny billet wheel when I was expecting a cast 76mm. That would make it a GTX3082R, if there were such a thing.
Now I need to decide whether to run it and put up with a bit more lag, or step down a bit for something a bit more fun on the street.
The 82mm wheel should push around 68lb/min. That's a good bit larger than I was going for, and definitely more flow potential than I'll use this year with this fuel system.
If my goal this year is 400whp, then the GT2871R will push that maxed out with a great power curve. The GT3082 would hit that easily, but I'm afraid the power "under the curve" will be less with the slower spool time.

More lag? More rpm.

Problem solved.

[sutyak]

More lag? More rpm.

Problem solved.

That is an option. I'm not sure the cams will breathe will enough above 7K where I'd need to run it. Upgraded cams, fuel system, charge piping and possibly turbo manifold to really take advantage of this beast. Sounds like a 2016 build thread.
There is another Focus owner with the earlier Zetec motor and a GT3082R that just ran a 10.4. Makes 620whp at 32psi. Hard to argue with that.

[JeffreyCole]

Jeez... I'm hoping to be able to shift mine below 8500 this year Lol....

I guess those are the differences between an engine more geared for economy from the factory and a car geared more toward performance.

[sutyak]

Jeez... I'm hoping to be able to shift mine below 8500 this year Lol....

I guess those are the differences between an engine more geared for economy from the factory and a car geared more toward performance.

These are fairly mild cams, but still better than stock for sure. Not "turbo" cams though, so there is still room for improvement there. That being said I haven't dyno'd it yet, so these cams may be perfectly fine. I won't be revving to 8500 RPM though! 8000 would be the max on this setup. Stock redline is 7K.

[JeffreyCole]

Lift and duration?