high boost on stock sequential twins - pfc charts!

[neit_jnf]

relevant mods:

INHALE:
M2 airbox, ASP large SMIC, upgraded y-pipe

EXHALE:
SMB 4inch downpipe, SMB 3.5inch metal cat resonated midpipe, RB 3inch Dual Catback

BURN:
550/1300 injectors, HKS Twinpower, BR10EIX plugs all around

BRAIN:
PFC - controlling boost as well (settings 1.3/100 1.3/80)
Using a v7.07 base map with only injector size and timing map changes, fuel is not tuned

Run done in 3rd gear, didn't take to redline because ran out of road.

boost 15-10-16.5
max duty cycle 77%

comments? at what power level you think im at?

[Brent]

The PFC can't control boost. Is this just what the car is running on it's own with your mods? Any idea what your A/F ratio's are? Injector duty looks fine, but that is only one piece of the puzzle. That's the upper limit of the stock twins as far as boost is concerned.

[neit_jnf]

the pfc does control boost and so far its been doing it well. I set this level of boost for some fun runs but normally i set it at 9psi, i have the boost switch enabled so I can switch from low and high boost on the fly.

all the info is on the pics I posted, afr's are in the low 10's, knock under 25. I plan on trimming the fuel and aiming for 11.2:1 afrs

[Brent]

The PFC/DL/Commander only allows setting solenoid duty cycle for the two sequential stages of boost and the fuel cut for overboost. You will generally see higher boost when colder unless you have a real boost controller.

[neit_jnf]

its ok its never cold in PR :)

[Dr-Rotor]

PFC has 2 boost settings that you can adjust and they do controll it. I tune these ECUs for my local rotary mech, as he dose not have the software.

[RXtacy]

Isn't there a PFC boost control kit as well, that has a solenoid just like other EBCs.

[jkstill]

Isn't there a PFC boost control kit as well, that has a solenoid just like other EBCs.

Yes, you can run the full boost kit w/controller, or just the solenoid and let the PFC control boost with it.

My car has just the solenoid, works well for 3 years now.

[cewrx7r1]

I only use charts for tuning the injectors during cross over from primaries to both,
or to look at the exact time of high knock. Good for looking at a small time interval.

Not good for looking a longer run. Best to use the Map Watch.

[SPICcnmFD]

I only use charts for tuning the injectors during cross over from primaries to both,
or to look at the exact time of high knock. Good for looking at a small time interval.

Not good for looking a longer run. Best to use the Map Watch.

+1, Map Watch is what I use mostly also. And If I want to get real detailed I'll save the log as an Excel file and edit out the info I don't want, like voltage, etc. so I can see exactly what is going on at each interval it reads. I guess I'm just not a Chart guy, more of a numbers guy.

[neit_jnf]

^^ that's how I did it I just opened the log files in the chart menu

I went back and reinstalled the KS EBSIII I had laying around from my M2 ECU days. I haven't logged anything as I also did 850cc primaries and haven't really had the time to play around.

One thing is sure, I get boost on the primary much much faster or at least feels that way. It can get full boost ~0.60 kg/cm2 at part throttle now and it didn't before! Transition feels better also.

I'm running this low boost because my factory clutch is on its last legs, it can't hold much torque at 10psi or above. I found out when running 12psi and at first spool it started slipping then grabbed then at secondary transition slipping again so I lowered boost...

:'(

[Brent]

Just curious, how come you added a boost controller if the PFC was doing such a good job?

[neit_jnf]

I already had the boost controller gathering dust and wanted to test the difference of closed-loop feedback operation of the controller vs the duty cycle operation of the pfc. I set target boost instead of guessing duty cycles.

I really miss the solid high-low boost switch that I had enabled in the pfc!! Click - 9psi, click - 17psi on the fly, I was using the fog lights switch for this. In the KS I have to go into mode, manually change the target boost, go back into on mode, and wait for the controller to adjust the duty cycles. Every target boost change is acompanied by a first-boost waviness or pulsing while the controller settles down to a steady boost level. No easy and quick on the fly one-button boost change. I do like the earlier spool though.

I haven't run more than 14psi in this controller though, so I don't know how it compares with the pfc's own controll at higher boost. Can't really test it until after I change the clutch. I'll decide then if I keep the controller or sell it and just use the pfc. Both the pfc and ks ebsIII use the car's stock system to control boost.

Plus I just like changing and testing things in my car! Examples, I've had 5 different downpipes: OEM JDM no pre-cat, SSAutochrome, Bonez, HKS and current one 4" SMB; 3 Midpipes: Bonez, Custom made resonated, and current one SMB; 3 Intakes: adam-c, sr motorsports, m2; 2 short shifters: b&m, re-amemiya; 3 diff size batteries: stock, optima yellow top 51r, oddesey pc680; etc etc etc

[Brent]

That's cool. You said that both the PFC and EBS III use the stock system to control boost, so the KS EBS III doesn't come with a solenoid that controls boost? How does it hook up to the car? The one I had a few years ago came with a solenoid to control boost. It was kind of a neat system to control both turbo's, but I've come to the conclusion after testing almost every boost controller out there, I think that 2 manual boost controllers are the best bang for the buck for a sequential car.

[neit_jnf]

no it doesn't have a solenoid. it's very easy to install, just needs a boost source for its internal map sensor and it has a bypass wire harness that connects before the ecu harness and taps into the necessary wires.