Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal - Page 38 - 3000GT/Stealth International Message Center

Jasbo · 02-10-2008, 06:56 AM

Quote:

Originally Posted by maddux317

What brand 550's are you running?

PTE 550's from IPS Motorsports fuel kit...

Jasbo · 02-10-2008, 06:59 AM

Quote:

Originally Posted by leet

your timing should stay about the same since removing the honeycombs is just a different way of lying to the ECU about how much air is going in to it, the same as using a AFC

the major improvement of this mod is the improved airflow

yes I Agree this should be true... yet not only myself but others as well have complained about the ECU modifying timing due to this... The data logs tell the truth. Before and after mod logs show this..

maddux317 · 02-10-2008, 09:37 AM

I'm thinking this changes the reading of baremetric pressure sensor. My theory is that with the honeycomb removed, your get faster air flow through the MAS, and thus lower pressure inside of it.......... I'm no engineer though

It could also have some effect on the temperature reading, but it seems as though you would see a lower temp due to less friction with no honecomb.... Something I've been thinking about is there are resistors that you can install in your MAS to fool the ECU into thinking the intake charge it cooler so it advances the timing and adds fuel. Maybe it would be possible to install a resistor that would fool the ECU into seeing a warmer charge, and thus take timing out...............

91vr4n00maxima · 02-10-2008, 11:13 AM

Quote:

Originally Posted by 3startuna

buy a greddy emanage, an LT1 maf and a MAF-T

thanks for that insight but this thread is concerning the stock MAF.

zba857 · 03-28-2008, 07:40 PM

Quite a read. I have stock fuel. If i remove all honeycombs would i need fuel correction?

slage · 03-30-2008, 03:02 AM

I have been running zero honeycombs in my car for about 2 months with no problems what so ever. my 13t's are set at 15psi right now. pump 91 octane. zero problems. so far this mod seems very promising!

Kibwe Walker · 03-30-2008, 12:25 PM

Quote:

Originally Posted by zba857

Quite a read. I have stock fuel. If i remove all honeycombs would i need fuel correction?

Your car would not idle right depending on how many honeycombs you remove because you would definitely need to richen up the idle area to get your O2's cycling.

I am at +13 with my neo in the idle area to get them to cycle with all side honeycombs removed.

zba857 · 03-31-2008, 04:58 PM

W/ the middle one left intact one would need to richen it up because its not registering the extra air. W/ the middle one out and the rest in, one would need to lean it up.. I would think w/ all honeycombs removed one wouldn't need to richen it up because the ports would have 'equal' resistance. Seems logical..

I'll try this when i get my datalogger working again.

It seems like the only difference between this and adding an open element filter would be more turbulence at the sensor..

zba857 · 03-31-2008, 06:02 PM

meh.. damn those glued in side combs.. Im going to have to do this when i get back in about 12 days...

q2418130103p · 04-01-2008, 08:08 PM

please correct me if im wrong, and i apologize if this was mentioned already, i did a quick search of the thread and didnt see much.

but wouldnt a similar result be achieved by lowering the base fuel pressure?

i assume the power gain has a lot to do with getting the IDC's closer to optimal, but in this case you are chaning the amount of air that is metered as apposed to chaning the amount of fuel that it demanded.

similarly, couldnt you lower to base fuel pressure so you could get the IDC's closer to 85% or what ever?

02-10-2008, 09:37 AM	#373 (permalink)
maddux317 Meet the twins Join Date: Nov 2002 Location: Jasper, AL Drives: 98 VR4 and 92 FWD TT Trader Rating: (22)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal I'm thinking this changes the reading of baremetric pressure sensor. My theory is that with the honeycomb removed, your get faster air flow through the MAS, and thus lower pressure inside of it.......... I'm no engineer though It could also have some effect on the temperature reading, but it seems as though you would see a lower temp due to less friction with no honecomb.... Something I've been thinking about is there are resistors that you can install in your MAS to fool the ECU into thinking the intake charge it cooler so it advances the timing and adds fuel. Maybe it would be possible to install a resistor that would fool the ECU into seeing a warmer charge, and thus take timing out............... Last edited by maddux317 : 02-10-2008 at 09:43 AM.

03-28-2008, 07:40 PM	#375 (permalink)
zba857 broke joke Join Date: Sep 2002 Location: SB, CA Drives: 6spd 92' Trader Rating: (1)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal Quite a read. I have stock fuel. If i remove all honeycombs would i need fuel correction? __________________ 92' firestorm VR-4 - complete 96' JDM drivetrain - 92' electronics/sensors - UR cam gears, flywheel - DNP pipes - Stillen intake, rotors - 3sx downpipe, steel braided lines, subframe/diff bushings, control arms, plennum spacer - Tein s - denso IK24 - Apex'i AVC-r - MP solid mounts - Spec 3 - Vacc reduction Deleted - ALL emissions, AA, antenna, rear wiper, front washer bottle, batt relocate, 4WS

03-30-2008, 03:02 AM	#376 (permalink)
slage Norcal3S.com Join Date: Mar 2005 Location: east bay CALI Drives: 92 VR4 // 96 Jeep ZJ Trader Rating: (58)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal I have been running zero honeycombs in my car for about 2 months with no problems what so ever. my 13t's are set at 15psi right now. pump 91 octane. zero problems. so far this mod seems very promising! __________________ 13T's + Supporting Mods\|DSM SMIC's\|K-Sport Coilovers\|Battery in Trunk Alchy Injection\|Saner Sway Bars\|Bronze 17x9 FN01R-C's\|3" Straight Pipes 1992 VR-4: My Weekend Warrior 1996 Grand Cherokee: My DD, 4" Lift and 31" Tires

03-31-2008, 04:58 PM	#378 (permalink)
zba857 broke joke Join Date: Sep 2002 Location: SB, CA Drives: 6spd 92' Trader Rating: (1)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal W/ the middle one left intact one would need to richen it up because its not registering the extra air. W/ the middle one out and the rest in, one would need to lean it up.. I would think w/ all honeycombs removed one wouldn't need to richen it up because the ports would have 'equal' resistance. Seems logical.. I'll try this when i get my datalogger working again. It seems like the only difference between this and adding an open element filter would be more turbulence at the sensor..

03-31-2008, 06:02 PM	#379 (permalink)
zba857 broke joke Join Date: Sep 2002 Location: SB, CA Drives: 6spd 92' Trader Rating: (1)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal meh.. damn those glued in side combs.. Im going to have to do this when i get back in about 12 days...

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04-01-2008, 08:08 PM	#380 (permalink)
q2418130103p Forum Member Join Date: Sep 2004 Location: Johnston, RI Drives: 1993 Mits 3000gt VR4 Trader Rating: (3)	Re: Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal please correct me if im wrong, and i apologize if this was mentioned already, i did a quick search of the thread and didnt see much. but wouldnt a similar result be achieved by lowering the base fuel pressure? i assume the power gain has a lot to do with getting the IDC's closer to optimal, but in this case you are chaning the amount of air that is metered as apposed to chaning the amount of fuel that it demanded. similarly, couldnt you lower to base fuel pressure so you could get the IDC's closer to 85% or what ever? __________________ Want to Buy: Downpipe that doesnt eliminate main cat (its fine if it eliminates the precats though) EBC Built into Boost Gauge Door Interior with no bubbles 1g Head lamp shroud