Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal - Page 12 - 3000GT/Stealth International Message Center

JeremyG · 08-11-2003, 08:14 PM

I'm gonna chime in really quick...

When I installed my 680cc injectors (the PTE ones really more like 640's), I got knock. Timing at WOT was OVER 40 DEGREES! I'd IMMEDIATELY get 15-25 knock sums (at like 3psi!)

I pulled my base timing to around 2 degrees BTDC and now getting more like 30-35 degrees, the car pulls like mad and now less than 10 knock sum. HOWEVER my problem now is that I have NO low end. The car is like an on-off switch. No boost, feels like an SOHC (not joking). Boost and all the sudden the tires break loose from the power (not joking).

The datalog shows almost NO timing advance until boost comes on and then IMMEDITALY up to 30degrees. That's where the on-off switch effect happens.

Anyway, what I'd like to add is that I had this problem with the stock MAF and ALSO HAVING IT WITH THE LS6 MAF and MAF-T. I think it's a little bit less, but still the problem is there.

So my conclusion is that gutting the MAF can't have much more/better effect than putting in the LS6 maf combo.

Innovator · 08-11-2003, 08:35 PM

Put the right size injectors in (550) and try again

Import Power · 08-11-2003, 08:44 PM

I put in 780s after I would hit 96-97% IDC on the 550s

Here is a log I ran today.
ArcII 87mm
780 PTE injectors
propane

Running 20psi on this run
WOT on 2nd and 3rd

Notice timing at the end of 2nd hits 39 and no knock and 3rd gear pull is damn close to that. IDC of 70%

I know O2s are 98 but with propane O2s seem to run higher on the O2 sensor and runs great on my car.

Sammy · 08-11-2003, 10:26 PM

Quote:

Originally posted by Innovator

Why do you need um?

I don't know yet....I haven't taken them out but I did "damage" them a little when I put in my intake a while back. Some of the combs were crushed (about 10% on both sides). I wonder if this may have contributed to my highly erratic power curve....

http://home.nyc.rr.com/csammy/awd2.jpg

I wasn't totally convinced my manual boost controller was responsible for those erratic spikes.

JeremyG · 08-11-2003, 10:37 PM

Quote:

Originally posted by Innovator
Put the right size injectors in (550) and try again

15g's + LS6 MAF (big one) + 20psi aspirations = 680cc's

Innovator · 08-12-2003, 05:55 AM

I don't know where you guys get this stuff.

Eric_VR-4 · 08-12-2003, 07:54 AM

Wow.. that was the most interesting thread I have read in a while.. with dyno improvement #'s like THAT... yes... I'll be giving it a try thank you. can always go back..

This is just the stuff that makes this site so reliable for good info.. the debates get hot until the truth be known for all to see. Good work to both sides of it

and thank you Innovator.. if this works, I am in your debt.

Import Power · 08-12-2003, 07:59 AM

Pulling honeycombs is nothing new. Been done for years...Heck I did it last year and was able to change my -33% +- correction to low -20% and yes, there were threads when I did it last year.

Bluv69k · 08-12-2003, 08:46 AM

jeremy, try pulling the s-afc and using maft only. Let me know

JeremyG · 08-12-2003, 08:51 AM

I have done MAFT with the AFC at 0% across the board, is that basically the same thing?

I ask because my AFC is soldered in so it would be a real pain to remove it.

08-11-2003, 08:14 PM	#111 (permalink)
JeremyG VIVA LAS VEGAS!! Join Date: Jul 2000 Location: Las Vegas Drives: 2004 WRX STi Trader Rating: (26)	I'm gonna chime in really quick... When I installed my 680cc injectors (the PTE ones really more like 640's), I got knock. Timing at WOT was OVER 40 DEGREES! I'd IMMEDIATELY get 15-25 knock sums (at like 3psi!) I pulled my base timing to around 2 degrees BTDC and now getting more like 30-35 degrees, the car pulls like mad and now less than 10 knock sum. HOWEVER my problem now is that I have NO low end. The car is like an on-off switch. No boost, feels like an SOHC (not joking). Boost and all the sudden the tires break loose from the power (not joking). The datalog shows almost NO timing advance until boost comes on and then IMMEDITALY up to 30degrees. That's where the on-off switch effect happens. Anyway, what I'd like to add is that I had this problem with the stock MAF and ALSO HAVING IT WITH THE LS6 MAF and MAF-T. I think it's a little bit less, but still the problem is there. So my conclusion is that gutting the MAF can't have much more/better effect than putting in the LS6 maf combo. __________________ Livin' And Lovin' Las Vegas

08-11-2003, 08:35 PM	#112 (permalink)
Innovator Blowing hot air Join Date: Aug 2001 Location: Albany NY Trader Rating: (6)	Put the right size injectors in (550) and try again __________________ Broadway Auto Clinic..Home of Big Dicks Performance *Rick@broadwayautoclinic.com* 518-434-4077 http://www.BroadwayAutoClinic.com http://www.BigBoysFastToys.com 19T turbos from Blouch TurboDR Stage Three Heads Pauter connecting rodsWiseco Forged PistonsNew OE forged crank Nissan connecting rod bearings32X15X3.5 FMIC and 2.5" hardpipesTANABE SUPER MEDALION RACING HYPER exhaustcustom downpipeACPT 1 piece drive shaft RPS Stage Three Clutch Emange Blue and EO1 piggyback Koyo 2" aluminum radiatorDenso 660 injectors Greddy 60MM gauges in every flavorFJO widebandDawes Twin AF gageswater cooled oil cooler H&R lowering springs and ne OE struts5Ziggen 18X8.5 FN1OC Gunmetal wheelsGoodyear F1 tires**etc,etc

08-11-2003, 08:44 PM	#113 (permalink)
Import Power Play that Funky Music Join Date: Jan 2002 Location: Behind the Wheel Drives: Vicki Insane Trader Rating: (209)	I put in 780s after I would hit 96-97% IDC on the 550s Here is a log I ran today. ArcII 87mm 780 PTE injectors propane Running 20psi on this run WOT on 2nd and 3rd Notice timing at the end of 2nd hits 39 and no knock and 3rd gear pull is damn close to that. IDC of 70% I know O2s are 98 but with propane O2s seem to run higher on the O2 sensor and runs great on my car. __________________ AEM Factory Trained Tuner T4 AWD 9.21 @ 154.98 T2 FWD 10.19 @ 140.31 T4-159.23 MPH Ran on 6G72 3.1L! T4-995AWHP Uncorrected 6G72 3.0L C16 T2-820FWHP 3.1L 27psi C16 91VR4 Red-17Gs w/supporting mods-sold 93SLTT/T2 91VR4 Pearl White-sold 91VR4 Black-sold 92VR4 Sandstone-sold 94VR4 Green-sold 93VR4 Pearl White-sold 91VR4 Black-5027s-3.0L-Stock heads and Cams- 625AWHP 557AWTQ uncorrected 24psi 102 octane Daily Driver 3SX Performance 3SX Performance Service Email

08-12-2003, 07:54 AM	#117 (permalink)
Eric_VR-4 Insert Evil Laughter Join Date: Nov 2000 Location: San Francisco, CA Drives: 93 VR-4 Trader Rating: (3)	Wow.. that was the most interesting thread I have read in a while.. with dyno improvement #'s like THAT... yes... I'll be giving it a try thank you. can always go back.. This is just the stuff that makes this site so reliable for good info.. the debates get hot until the truth be known for all to see. Good work to both sides of it and thank you Innovator.. if this works, I am in your debt. __________________

08-12-2003, 08:46 AM	#119 (permalink)
Bluv69k buy my car Join Date: Sep 2001 Location: Atlanta, GA Drives: I can't drive 55 Trader Rating: (8)	jeremy, try pulling the s-afc and using maft only. Let me know __________________ 2001 Lightning catz 9007 bi-xenon hids, CF radiator cover SOLD ! 1991 red VR4 New factory block( forged crank, forged rods), triple stack head gaskets, 3kgt stage 3 heads with oversized valves, ported lower intake, Big Bore throttle body and matched plenum, Fidenza cam gears, Ported and jet coated exhaust manifolds, jet coated DN precat eleminators, ATR downpipe with no main cat, custom catback, 3sx pulley, 650 turbos, DN Y-pipe, Rps stage 3 and fidenza flywheel, 99 lifters, SS brake lines, 18x9 snipers, drilled and slotted rotors, intrax springs, 3kgt short shifter, New leather, new carpet, Full apexi EL1 gauge setup, Blitz indiglo DSBC, Apexi BOV, supermac floormats and door sills, gto panel, ek2 rail mod, stillen intake, hot wire kit, Denso pump, S-AFC II, RC550 cc inj, aladdin a2000 remote start, push button start, reverse indiglo main cluster, greddy shift knob, sparco pedals, powdercoated plenum and valve cover, aluminum GTO plug plate, powdercoated aluminum dash vents, polished fuel rails, Hella H4 conversion, Hella 7500k Bi-xenon Hid kit. Hella fog lights with angel eyes and catz h3 bulbs

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08-12-2003, 05:55 AM	#116 (permalink)
Innovator Blowing hot air Join Date: Aug 2001 Location: Albany NY Trader Rating: (6)	I don't know where you guys get this stuff.

08-12-2003, 07:59 AM	#118 (permalink)
Import Power Play that Funky Music Join Date: Jan 2002 Location: Behind the Wheel Drives: Vicki Insane Trader Rating: (209)	Pulling honeycombs is nothing new. Been done for years...Heck I did it last year and was able to change my -33% +- correction to low -20% and yes, there were threads when I did it last year.

08-12-2003, 08:51 AM	#120 (permalink)
JeremyG VIVA LAS VEGAS!! Join Date: Jul 2000 Location: Las Vegas Drives: 2004 WRX STi Trader Rating: (26)	I have done MAFT with the AFC at 0% across the board, is that basically the same thing? I ask because my AFC is soldered in so it would be a real pain to remove it.