is it necessary to replace the stock afm w/ lexus if you do the screw thing to the stock one? cause i was reading on 935; again, and he has a lexus replica that uses your stock electronics. so just curious
Lexus afm and stock
- Thread starter sleepersupra
- Start date
The lex AFM allows 25% more air, typically matched with 550cc injectors supplying 25% more fuel (vs stock 440cc), plug and play.
The AFM screw mod is for minor adjustment, but I see you have an SAFC so the screw shouldn't matter at all if you are tuning A/F with that? Are you on stock 440's or something else?
The AFM screw mod is for minor adjustment, but I see you have an SAFC so the screw shouldn't matter at all if you are tuning A/F with that? Are you on stock 440's or something else?
yea stock 440's but i am waiting to tune the afc until i figure this stuff out. so you're saying that i can or can't with the screw adjustment
wont really matter with the safc. it will only give you a minor amount more air flow. and as far as using the electronics with the lex afm, you still need to use the 7m electronics vs the lex. or so ive heard.......
^a must read when prepping to do this mod.
well i've been trying to find the info on the electronics. it's something like if there's a 10 or 11 at the end of the part number as to whether you need to use your old electronics. and i think the short version of that is pre-90 use your old electronics, post-90 lex electronics will work.
don't quote me on this - yet - someone else with exact information chime in
well i've been trying to find the info on the electronics. it's something like if there's a 10 or 11 at the end of the part number as to whether you need to use your old electronics. and i think the short version of that is pre-90 use your old electronics, post-90 lex electronics will work.
don't quote me on this - yet - someone else with exact information chime in
shaeff said:
That's a great write up. I also really liked the way you did the injector clips/wiring.
In addition I think the walbro fuel pump (to help with fuel pressure) and removing the J-tube and stock FPD may help for a more flowing system. I didn't see that in there but maybe I missed it
But then again you were trying to focus mostly on the Lex and not the entire system.
I backed out the screw in my stock AFM all the way, only hit FCO once or twice when it was like 15 degrees outside ( more dense air )...but when its gotten 60 degrees here lately ( this week acutally ) I have NOT hit FCO....
the LEX AFM I have also, I never hit FCO in the cold. It just ran PIG RICH....so it really didnt feel different at all...actually the car felt SLOWER with the LEX AFM ( without tuning with the SAFC) than it did with the stock AFM with the screw backed out.
Either way a bigger diameter tubig with the AFM meter and the Karmaan mesh stuff on the tubes would be ideal.
I plan to do some niftly little experiment soon with that....
-Jonathan
the LEX AFM I have also, I never hit FCO in the cold. It just ran PIG RICH....so it really didnt feel different at all...actually the car felt SLOWER with the LEX AFM ( without tuning with the SAFC) than it did with the stock AFM with the screw backed out.
Either way a bigger diameter tubig with the AFM meter and the Karmaan mesh stuff on the tubes would be ideal.
I plan to do some niftly little experiment soon with that....
-Jonathan
siman said:
ok now when i thought i was catching on this comes into the equation....
what is the Karmaan mesh and when talking about larger diameter tubes (on what)
the mesh stuff straightens out the air flow. the vortex is created by the long part of the electronics box that sticks into the afm:
http://www.autoshop101.com/forms/h21.pdf
http://www.autoshop101.com/forms/h21.pdf
Thanks ismns!
I have been throwing it around in my mind to take a 3" diamter tubing ( induction side size of my new turbo) and somehow get a mesh like that of the Karmaan ( or just use the stuff from the Lex AFM i have) and put it INSIDE THE TUBE infront of the AFM sensor that sticks down into the tubing.
It would work. and I could mount the AFM on the UNDERSIDE of the tubing for the "clean" look.
It would work 100% without a doubt.
-Jonathan
I have been throwing it around in my mind to take a 3" diamter tubing ( induction side size of my new turbo) and somehow get a mesh like that of the Karmaan ( or just use the stuff from the Lex AFM i have) and put it INSIDE THE TUBE infront of the AFM sensor that sticks down into the tubing.
It would work. and I could mount the AFM on the UNDERSIDE of the tubing for the "clean" look.
It would work 100% without a doubt.
-Jonathan
i backed out my screw on the stock afm and ued to use a hks evc iv and didnt hit f/c it about 15 psi (and thats in 90 eg. weather in no. alabama up in the mountians ((banjo's chime in)) ). tune the safc. god if u have it use it!!!
Maybe not. Here is how it works. Air and water flow very similarly. If you ran water through the AFM, would it move exactly like it would through a tube you make? No, of course not. The AFM has an LED and reflector. The reflector wiglges as the air passes over it. This wiggle gets faster as the airflow gets faster, just like water. Sort of like a boat moving through the water. The waves move out away from the boat just like the air, as it goes over the vortex generator. That air movement causes the slight vibration of the reflector.
bcg04 said:That's a great write up. I also really liked the way you did the injector clips/wiring.
In addition I think the walbro fuel pump (to help with fuel pressure) and removing the J-tube and stock FPD may help for a more flowing system. I didn't see that in there but maybe I missed it
heh, although i wish i had written that, the author actually wrote that before i even owned a supra!
-shaeff
how safe is the stock afm mod? im looking at my bros car with an upgraded turbo and hes hitting FC with just the WG. mods are 3in exhaust intake bov and lower ic pipe. how far can you move it out and not worry about running lean?
that depends on injectors, fuel pump and other variables. i have had the screw backed out about as long as ive had my car(bout 1 year). hade no problems. i check my plugs once a month. even check the o2 sensor for funky build up(i drive it like i stole it. DAILY!!!!!). i even have a cheap a/f meter. better to be safe than sorry. no problems yet other than the fact i blew out my clutch from beating it like a red headed step child one weekend.
Nick M said:
Funny, you never posted WHY it would NOT work.
You think I dont already understand how the Karmaan system works? LOL
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