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

Multiades · 08-07-2003, 10:54 AM

...but this mod WILL NOT net you less advanced timing.

You are essentially making up some of the correction at the MAS, and some of it with the AFC, but the TOTAL correction is still the same. You are only able to change the airflow signal (in this case by using two combined methods instead of just one), but you are not changing ANYTHING relating to the ECU's internal mapping.

In other words, if you were to measure the frequency of the airflow signal going into the ECU, you would find that at a particular airflow (say x boost at y rpm) and a particular a/f ratio, you have the exact same signal at the ECU with either method (SAFC correction only vs. SAFC correction + honeycombs removed).

I'm not saying this doesn't have potential benefits (it does, if you can make it work reliably -- better flow and a higher peak flow accuracy with the stock MAS), but the concept that it is changing the total "corrected" airflow is a fiction.

-Chris Wood

08-07-2003, 10:54 AM	#44 (permalink)
Multiades vehicular thaumaturgist Join Date: Apr 2000 Location: Woburn, MA Drives: 1994 Stealth TT Trader Rating: (17)	Hate to rain on your parade, Innovator... ...but this mod WILL NOT net you less advanced timing. You are essentially making up some of the correction at the MAS, and some of it with the AFC, but the TOTAL correction is still the same. You are only able to change the airflow signal (in this case by using two combined methods instead of just one), but you are not changing ANYTHING relating to the ECU's internal mapping. In other words, if you were to measure the frequency of the airflow signal going into the ECU, you would find that at a particular airflow (say x boost at y rpm) and a particular a/f ratio, you have the exact same signal at the ECU with either method (SAFC correction only vs. SAFC correction + honeycombs removed). I'm not saying this doesn't have potential benefits (it does, if you can make it work reliably -- better flow and a higher peak flow accuracy with the stock MAS), but the concept that it is changing the total "corrected" airflow is a fiction. -Chris Wood __________________ The Pansy Patrol - a 3000GT/Stealth car blog with how-tos Pearl Yellow 1994 R/T TT w/84k - FOR SALE! new 4-Bolt factory short block, DR StgII heads, Titan TD05 headers, 14B turbos w/ ported 7cm^2 housings, 3" minimum-bend catless exhaust, SCE oil pan, RPSII clutch, Fidenza flywheel, OZ F1 Plus 17x9.5" wheels, Kumho Ecsta MX 245/45 tires, Drweldin DSM SMICs, 3SX engine mounts (Maximal solid front), GReddy 60mm P/H/W boost, Carbotech Panther Plus & Bobcat pads w/ slotted/drilled rotors, KSport GT-Pro coilovers, Maximal rear camber arms, SCE balljoints, ABS delete w/ cockpit-mounted Wilwood proportioning valve, AC delete, EGR/evap/dashpot delete, cruise/vacuum-tank delete, '95 Lexan headlights, McCulloch 4300K HIDs, GReddy Type-S BOV, solid shift bushings; Misc Parts: Walbro341, 20# fixed-back seats, Accelerated Moto catch can