MAFT Gen 2 - Anyone? - Page 14 - 3000GT/Stealth International Message Center

David_J · 02-15-2008, 03:33 PM

I am running a Gen 1 MAFT so it is liveable. Much better than before I made the changes.

josevr4 · 02-16-2008, 09:32 AM

No more CELs. I fixed the vacuum leak. The Boost/Vacuum guage now reads --14Hg. The car doesnt idle as bad. What i did to my PCV i ran them both to the Vacuum source the front PCV valve uses. It gives me a much stable idle. I have the idle settings on the GENII at 12.0for idle and 2.0 for filtration. What would be the best settings to give me the most stable idle?

TurboBob · 02-16-2008, 12:09 PM

this is going to pull a vacuum on your crankcase, some guys think this is a good thing, some don't.

Krank Vents do this, and there are lots of guys running them.

The idle filter is for those guys that have their MAF really close to the radiator fan and get a lot of turbulence.

You probably don't need the idle filter.

Bob

josevr4 · 02-16-2008, 03:41 PM

Heres my setup. I teed off the front and rear crank case to the vacuum source under the intake mani. i got all my settings in user tune starting at+9 and then changing all the way up to -8% on all my Loads. Mainscale i have set to 0. I now spool my weebit 9bs at 2400ish rpm.

Photo-0003[1].JPG And heres my setup

0001.jpg

josevr4 · 02-17-2008, 06:53 PM

Does leaning out the idle raise it? Finally got her to run and idle perfect.

TurboBob · 02-19-2008, 12:42 PM

leaning out the idle might raise it, it depends on Mitsu's idle strategy.

Sounds like you are getting things worked out.

Bob

josevr4 · 02-19-2008, 03:33 PM

Thanks for the help

twinturbvr4 · 03-02-2008, 01:32 PM

What are some good basic settings for the AFR tracking? I just got my wideband back and have just hooked up the wideband to the GenII. As of right now I have my mainscale back to -20 for the 450s.. and everything else cleared, in the AFR tracking, I have things set at about 12.0 desired AFR I think... for 2000, 3000, 4000 rpms.. I'm having some pretty bad lag when I get on it.. seems like it bogs down real bad, and then after a few seconds, shoots up to full boost.. Its been about a month or so since I've really messed around with the GenII, so I just set it back to -20 and started from there.. looks like Im running to about 12.0 afr at WOT around 4500rpm.. so thats not too bad I dont think.. 15psi of boost. I'll have to pull some more logs, but I'm just trying to see if I should go up or down on the fuel adjustments, etc.

thanks.

twinturbvr4 · 03-03-2008, 05:20 AM

maybe its time to replace that fuel pump.. seems like when I have the mainscale set around -15 or -16 I get a much better response, so maybe the pump just isnt enough for the 450s.. ill be getting that upgraded pretty quickly here.

Set at -16, I still have to add fuel at high and mid load, so I think this is just confirming my thoughts..

twinturbvr4 · 03-14-2008, 09:31 AM

Ok, new pump is in, 3.5" MAF is in.. train track of tbolts are on.. everything looks good and solid. I've 0'd everything out and set my mainscale to -19.. at 15psi I get real good results.. if I go to 16 or 17psi.. it seems like Im getting maybe spark blow out or something? seems like above 15psi it sputters just a little and really has no additional power, could this be a tuning issue, spark plugs maybe? I'll get some logs up hopefully this weekend.

02-15-2008, 03:33 PM	#131 (permalink)
David_J Ex-VPC Headbanger Join Date: Aug 1999 Location: Fuel Tuning Hell Trader Rating: (0)	Re: MAFT Gen 2 - Anyone? I am running a Gen 1 MAFT so it is liveable. Much better than before I made the changes.

02-16-2008, 09:32 AM	#132 (permalink)
josevr4 ALCHYTHIRSTY IRON HORSE Join Date: Jun 2007 Location: bakersfield cali Drives: like my mother Trader Rating: (4)	Re: MAFT Gen 2 - Anyone? No more CELs. I fixed the vacuum leak. The Boost/Vacuum guage now reads --14Hg. The car doesnt idle as bad. What i did to my PCV i ran them both to the Vacuum source the front PCV valve uses. It gives me a much stable idle. I have the idle settings on the GENII at 12.0for idle and 2.0 for filtration. What would be the best settings to give me the most stable idle? __________________ Dejon dual intakes and Ypipe, Synapse B.O.V., Gen2 Maft w/3.5" sensor(blowthru), RandomTech Cat,3SXdownpipe,Ips singletip exhaust, Maximal solid motormounts,13t's,Gtpro headers(powdercoated) w/precat elims,Supra Fuelpump,550cc's,AEM Fpr,IPS hotwire kit, and Southbend DXD-FE ,Newvolt ignition amp,IK27 plugs,300M output shaft. 289awhp and 298awtq on 10psi @11.3AFRlimited by bad VSS's Next ported heads and all new bushings.

02-16-2008, 12:09 PM	#133 (permalink)
TurboBob Resident mad scientist Join Date: Jan 2003 Location: Near Detroit Drives: 86 GN 91 RT/TT Trader Rating: (13)	Re: MAFT Gen 2 - Anyone? this is going to pull a vacuum on your crankcase, some guys think this is a good thing, some don't. Krank Vents do this, and there are lots of guys running them. The idle filter is for those guys that have their MAF really close to the radiator fan and get a lot of turbulence. You probably don't need the idle filter. Bob __________________ Need a datalogger? Check out the Scanmaster 3 PM me about ECU mods for 8000+ RPM rev limits !!!!!!!! Stock = 7300 RPM Stage 1 = 8060 RPM Stage 2 = 8200 RPM Stage 3 = 8400 RPM Stage 4 = 8800 RPM (By request only) 1991 Stealth RT/TT, Grooms Shortblock, 13G's, Translator Pro, www.maftpro.com

02-16-2008, 03:41 PM	#134 (permalink)
josevr4 ALCHYTHIRSTY IRON HORSE Join Date: Jun 2007 Location: bakersfield cali Drives: like my mother Trader Rating: (4)	Re: MAFT Gen 2 - Anyone? Heres my setup. I teed off the front and rear crank case to the vacuum source under the intake mani. i got all my settings in user tune starting at+9 and then changing all the way up to -8% on all my Loads. Mainscale i have set to 0. I now spool my weebit 9bs at 2400ish rpm. Photo-0003[1].JPG And heres my setup 0001.jpg

02-17-2008, 06:53 PM	#135 (permalink)
josevr4 ALCHYTHIRSTY IRON HORSE Join Date: Jun 2007 Location: bakersfield cali Drives: like my mother Trader Rating: (4)	Re: MAFT Gen 2 - Anyone? Does leaning out the idle raise it? Finally got her to run and idle perfect.

Sponsored Links
3000GT/Stealth International Message Center Advertisement

02-19-2008, 12:42 PM	#136 (permalink)
TurboBob Resident mad scientist Join Date: Jan 2003 Location: Near Detroit Drives: 86 GN 91 RT/TT Trader Rating: (13)	Re: MAFT Gen 2 - Anyone? leaning out the idle might raise it, it depends on Mitsu's idle strategy. Sounds like you are getting things worked out. Bob

02-19-2008, 03:33 PM	#137 (permalink)
josevr4 ALCHYTHIRSTY IRON HORSE Join Date: Jun 2007 Location: bakersfield cali Drives: like my mother Trader Rating: (4)	Re: MAFT Gen 2 - Anyone? Thanks for the help

03-02-2008, 01:32 PM	#138 (permalink)
twinturbvr4 rippin up lil FWD cars!! Join Date: May 2007 Location: Eastern PA Drives: 93 3000GT VR-4 Trader Rating: (10)	Re: MAFT Gen 2 - Anyone? What are some good basic settings for the AFR tracking? I just got my wideband back and have just hooked up the wideband to the GenII. As of right now I have my mainscale back to -20 for the 450s.. and everything else cleared, in the AFR tracking, I have things set at about 12.0 desired AFR I think... for 2000, 3000, 4000 rpms.. I'm having some pretty bad lag when I get on it.. seems like it bogs down real bad, and then after a few seconds, shoots up to full boost.. Its been about a month or so since I've really messed around with the GenII, so I just set it back to -20 and started from there.. looks like Im running to about 12.0 afr at WOT around 4500rpm.. so thats not too bad I dont think.. 15psi of boost. I'll have to pull some more logs, but I'm just trying to see if I should go up or down on the fuel adjustments, etc. thanks. __________________ 16Ts, ATR downpipe with high-flow cat, MBC (in cockpit), Kormex'd, 450cc's, Walbro Pump, MAFT GenII, 3.5" GM MAF Blow-through, HKS SSQV '07, EGR Blockoffs. Coming soon: 560cc injectors

03-03-2008, 05:20 AM	#139 (permalink)
twinturbvr4 rippin up lil FWD cars!! Join Date: May 2007 Location: Eastern PA Drives: 93 3000GT VR-4 Trader Rating: (10)	Re: MAFT Gen 2 - Anyone? maybe its time to replace that fuel pump.. seems like when I have the mainscale set around -15 or -16 I get a much better response, so maybe the pump just isnt enough for the 450s.. ill be getting that upgraded pretty quickly here. Set at -16, I still have to add fuel at high and mid load, so I think this is just confirming my thoughts.. Last edited by twinturbvr4 : 03-04-2008 at 08:03 AM.

03-14-2008, 09:31 AM	#140 (permalink)
twinturbvr4 rippin up lil FWD cars!! Join Date: May 2007 Location: Eastern PA Drives: 93 3000GT VR-4 Trader Rating: (10)	Re: MAFT Gen 2 - Anyone? Ok, new pump is in, 3.5" MAF is in.. train track of tbolts are on.. everything looks good and solid. I've 0'd everything out and set my mainscale to -19.. at 15psi I get real good results.. if I go to 16 or 17psi.. it seems like Im getting maybe spark blow out or something? seems like above 15psi it sputters just a little and really has no additional power, could this be a tuning issue, spark plugs maybe? I'll get some logs up hopefully this weekend.