MAF-T & Apexi AFC 5 KNOB

Awyman18 · 05-10-2012, 03:22 AM

Ok so im about to buy a maf-t and i currently own a apexi afc 5 knob. Im going to throw in some 550cc injectors and obviously a walbro 255 fuel pump. I was told, i dont need a new fuel regulator, and i can use the stock one. Is that correct or no?

Also, how does the maf-t hook up? And should i use the apexi 5 knob with the maf-t? I heard the maf-t kinda hooks up to ur fmic piping?

Maf-t i heard is a decent device for tuning, and getting past fuel cut...which is wat i want to do...lol i want to run 15psi on stock ct-26 and thats it. Wat can u tell me about maf-t?? ive searched the forums here and found lots of stuff on maft-pro but not much on maf-t

Also when i tune this, it will go to a professional. Any advice? lol

cre · 05-10-2012, 04:00 AM

I didn't re-read these but I'm pretty sure I covered the basics in at least one of them:

http://www.toyota-supra.info/forums/mkiii-supra/20429-karman-vortex-air-flow-meter-supra-turbo-lexus-compatibility-not-upgrade.html?highlight=maf-t
http://www.toyota-supra.info/forums/mkiii-faq/19847-maft-pro-or-something-newer-better-now.html?highlight=maf-t
http://www.toyota-supra.info/forums/mkiii-supra/15330-mass-air-flow-alternative.html?highlight=maf-t

The MAF-T is NOT a tuning device... That's why you have the SAFC. The MAF-T is only intended to allow you to convert to a GM MAF sensor with is available in larger sizes and thus offers less restriction (plus they're MUCH cheaper to replace, easier to find and just as reliable as your old KVAFM).

A NEW, STOCK fuel pressure regulator will be fine. The concern comes from running an old unit which isn't going to hold up to the extra flow. I haven't had a problem running stock FPRs and upgraded pumps. A healthy FPD is also needed.

Awyman18 · 05-10-2012, 04:31 AM

ive already read all of those cre lol they helped, but healthy FPD? fuel pressure detector..? lol but yea i keep hearing the MAF-T is a "rough" tune...so a crappy tune...doesnt sound good to me lol

cre · 05-10-2012, 06:32 AM

The MAF-T has trim potentiometers for low, mid and high signals inside of the unit. It's just for tweaking subtle offsets and it's resolution is poor. You are best off not considering it a tuning device of any sort... Keep the SAFC for that. If you must tune with the MAF-T's pots (for whatever reason), tune those first to set the mainscale and then tune with the SAFC.

The GM MAF will go in place of your KVAFM. You will need adapters to make it fit. I suspect a 3" MAF will fit the best. I think any larger is overkill for your application. The size of the MAF will affect your fuel cut.

FPD = Fuel Pulsation Damper. Basically it's a simple FPR used to reduce noise in the fuel rail... removes oscillations in fuel pressure which the FPR doesn't. It's on the backside of the fuel rail, looks like a FPR without the vacuum port, has a grey plastic cap and under that is just a tiny screw. DO NOT TOUCH THE SCREW!!!!!!!!!!! This is NOT a user serviceable part. A bad FPD will cause symptoms similar to a bad FPR.

Green7mgte · 05-10-2012, 11:56 AM

not to hijack. but since its along the same topic. Can you relay where I can find indepth info on open n close loop maps and how they work? I need to understand this. This information is pertinent to this topic also.

Awyman18 · 05-10-2012, 01:39 PM

awwww now we are on the same page cre..lol ok so, yea i plan on recirculating the bpv, so im going to put it where the kvafm goes (like u said) heard if i do this tho...i wont get that nice psshhhh sound tho? So get 3.5" piping and weld some bungs or watever on there to recirculate everything correct? Dont use my stock accordion pipe?

turbonicsperformance · 05-10-2012, 05:22 PM

you can use the stock acordian pipe if your going to recirculate your bpv. it will work exactly as if you still had a stock setup just with a maf instead of a kvafm

Awyman18 · 05-10-2012, 11:14 PM

lol i probably could of just texted u and ask turbo....fail

Awyman18 · 05-11-2012, 03:44 AM

where exactly and wat exactly am i looking in a FPD?

05-10-2012, 03:22 AM	#1
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	MAF-T & Apexi AFC 5 KNOB Ok so im about to buy a maf-t and i currently own a apexi afc 5 knob. Im going to throw in some 550cc injectors and obviously a walbro 255 fuel pump. I was told, i dont need a new fuel regulator, and i can use the stock one. Is that correct or no? Also, how does the maf-t hook up? And should i use the apexi 5 knob with the maf-t? I heard the maf-t kinda hooks up to ur fmic piping? Maf-t i heard is a decent device for tuning, and getting past fuel cut...which is wat i want to do...lol i want to run 15psi on stock ct-26 and thats it. Wat can u tell me about maf-t?? ive searched the forums here and found lots of stuff on maft-pro but not much on maf-t Also when i tune this, it will go to a professional. Any advice? lol

05-10-2012, 04:00 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I didn't re-read these but I'm pretty sure I covered the basics in at least one of them: http://www.toyota-supra.info/forums/mkiii-supra/20429-karman-vortex-air-flow-meter-supra-turbo-lexus-compatibility-not-upgrade.html?highlight=maf-t http://www.toyota-supra.info/forums/mkiii-faq/19847-maft-pro-or-something-newer-better-now.html?highlight=maf-t http://www.toyota-supra.info/forums/mkiii-supra/15330-mass-air-flow-alternative.html?highlight=maf-t The MAF-T is NOT a tuning device... That's why you have the SAFC. The MAF-T is only intended to allow you to convert to a GM MAF sensor with is available in larger sizes and thus offers less restriction (plus they're MUCH cheaper to replace, easier to find and just as reliable as your old KVAFM). A NEW, STOCK fuel pressure regulator will be fine. The concern comes from running an old unit which isn't going to hold up to the extra flow. I haven't had a problem running stock FPRs and upgraded pumps. A healthy FPD is also needed. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

05-10-2012, 06:32 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The MAF-T has trim potentiometers for low, mid and high signals inside of the unit. It's just for tweaking subtle offsets and it's resolution is poor. You are best off not considering it a tuning device of any sort... Keep the SAFC for that. If you must tune with the MAF-T's pots (for whatever reason), tune those first to set the mainscale and then tune with the SAFC. The GM MAF will go in place of your KVAFM. You will need adapters to make it fit. I suspect a 3" MAF will fit the best. I think any larger is overkill for your application. The size of the MAF will affect your fuel cut. FPD = Fuel Pulsation Damper. Basically it's a simple FPR used to reduce noise in the fuel rail... removes oscillations in fuel pressure which the FPR doesn't. It's on the backside of the fuel rail, looks like a FPR without the vacuum port, has a grey plastic cap and under that is just a tiny screw. DO NOT TOUCH THE SCREW!!!!!!!!!!! This is NOT a user serviceable part. A bad FPD will cause symptoms similar to a bad FPR. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

05-10-2012, 11:56 AM	#5
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	not to hijack. but since its along the same topic. Can you relay where I can find indepth info on open n close loop maps and how they work? I need to understand this. This information is pertinent to this topic also. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

05-10-2012, 05:22 PM	#7
turbonicsperformance 3" Exhaust Join Date: Apr 2010 Location: sarasota fl Posts: 194	you can use the stock acordian pipe if your going to recirculate your bpv. it will work exactly as if you still had a stock setup just with a maf instead of a kvafm __________________ 92 miata 7mgte swap forged pistons,studded mhg, 3 inch dp with a glass pack,blowthrough MAF-T,550cc inj, act stage 2 clutch, fmic kit, greddy rs, full wire tuck, rx7 lsd rear with 4.10s. 15psi "ct26-A"??(waiting on dyno #s) if anyone knows whats up with my turbo let me know it has a larger comp wheel nicer machining and 6 dual fins rather than 5? its confusing and keep finding too much contradicting info. would LLLLLOOOOOOOOVVVVVVVEEEEE a compressor map

05-10-2012, 04:31 AM	#3
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	ive already read all of those cre lol they helped, but healthy FPD? fuel pressure detector..? lol but yea i keep hearing the MAF-T is a "rough" tune...so a crappy tune...doesnt sound good to me lol

05-10-2012, 01:39 PM	#6
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	awwww now we are on the same page cre..lol ok so, yea i plan on recirculating the bpv, so im going to put it where the kvafm goes (like u said) heard if i do this tho...i wont get that nice psshhhh sound tho? So get 3.5" piping and weld some bungs or watever on there to recirculate everything correct? Dont use my stock accordion pipe?

05-10-2012, 11:14 PM	#8
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	lol i probably could of just texted u and ask turbo....fail

05-11-2012, 03:44 AM	#9
Awyman18 3" Exhaust Join Date: Apr 2011 Location: columbus Posts: 151	where exactly and wat exactly am i looking in a FPD?

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