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Thread: lexus afm and 550cc inj's
07-05-2010, 12:12 AM #1
lexus afm and 550cc inj's
So i have been reading on doing this on my 7mgte and what I have seen is that if you use the lexus afm you have to use 550cc injectors to match so that your ecu will take this in right and this can be run on a stock ecu no tuning required. thats pretty awesome but question is why? is there a power gain in this at stock psi? or is it just nice for future tune-ability? oh and happy 4th of july everyone!
07-05-2010, 01:46 AM #2
I'm pretty sure there are no gains with this mod on stock boost. Also, as I understand it, you need an SAFC or your car is going to run rich as hell.David H
85 Pos, 5.3/w58 swap
07-05-2010, 01:54 AM #3
From what I remember on this, with 550's and the matching AFM, you dont get more power stock, but you do get the ability to boost higher before hitting fuel cut.. I could be wrong though. I thought the lexus AFM let you run the larger injectors with out ecu issues/needing a AFC..85 Supra, Red, Auto, 300k. Chimpy 6M. MHG & ARPs. 60-1 Trim, Stainless Lines, Q45 Brakes, 16's, Al Rad+E fan, Oil kit and cooler, MSD 6a + Accel Coil ms2 3.57... Air shocks and coil overs in the works.. Maybe a mk3 trans next........
07-05-2010, 09:51 AM #4
07-05-2010, 01:57 PM #5
Good to hear. I must've been thinking of something else. I'm pretty sure theres tons of threads on this subject on supramania.David H
85 Pos, 5.3/w58 swap
07-05-2010, 02:11 PM #6
07-05-2010, 02:34 PM #7
the afm for the Lexus v8 is larger diameter but otherwise a Karman vortex unit like the 7mgte stock afm so it's a cheap easy way to get some better breathing into your 7mgte and keep it relatively stock. Increasing injector size from 440 to 550 correspondingly increases the fuel deliveryDave Harrison
'85 Mark2 7mgte 5sp Isis
'85 Mark2 7mgte Auto Athena
'85 Mark2 7mgte 5sp Gaia
07-05-2010, 02:39 PM #8
It does two things. First, you increase fuel and air delivery by 25%, so even at stock boost, you will see a power increase, figure 15-20% with stock ECUs "tuning" ability. Second, the larger diameter means a given volume of air moves slower past sensor, allowing more air to flow for a given sensor output. This means you can run higher boost levels before fuel cut sets in. On stock AFM, Fuel cut happened at 12 psi with my car. I still havent seen it at 18 psi with same turbo. Heres a very old link.http://www.suprasonic.org/public_htm...exusnotes.html86 SDR-"Shuttlecraft" 16" Drag dr-27 wheels, Coilover/AGX/Celica Arms front, Camber Mod/Cut Springs rear, Poly Bushings all around, Whiteline sway bars, 12" Homemade bbk front and rear, Weir Diff bushing, Pacesetter with custom RABID CHIMP mandrel bent 2.5 with Flowmaster resonator, short shifter, 5m-GZE using upgraded sc-14 Toyota supercharger, with Custom RABID CHIMP piping..
07-05-2010, 02:48 PM #9
yeah im really wanting to do this little upgrade just still lookin for some good injectors. Im hoping by now everyone knows about venoms so thats out, I have seen alot of deschworks (sp) injectors around but to be honest i havent heard much about them, im probably just going to spend the money and get some rc ones soon cause they are reputable company.
07-05-2010, 02:56 PM #10
denso or RC injectors. done1983 p-type 7mgte/R154
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