LEX AFM Question ?????

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ericshere03

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Apr 17, 2006
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Me an a friend have a bet if i win i get a 60:1 CT26 So her it goes:
I was wondering if I were to buy a LEX AFM and 550s that with the modified adjustment screw i would have a running car that is neither pig rich or lean to the point of turning my pistons into swiss cheese Anyway i (for the time being) am working with keeping the stock management setup and wondering if that recepie would work. Help me out guys if i win i get a cheep decient management solution and a turbo. if not i guess its a MAFT pro. BTW the car has KN intake, ported elbow 3in DP and full 3in exhause, a ssqv BOV, and a shimmed ct26 (9lbs).

Thanks,
Eric Wolf
 
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MKIIINA

Destroyer of Turbos
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550s can be found on ebay easily. go with a reputable company like RC or lucas. the lex afm also on ebay or the f/s section. i am currently running this setup and have no need to touch the adjustment screw and without tuning on a dyno with a wb and some other way of dealing with fp and more flow from the pump its not recommended by me :)
 
N

NDBoost

Guest
yes, clear this up.. I for one have always been under the impression you will not be able to tune the car with that adjusting screw on the AFM. Instead you will be doing a more "blind" tuning.. and would never be able to matchthe amount of tuning capability as a MAFT Pro or S-AFC setup would offer you.
My impression of that screw was to adjust your idle fuel ratio of some sort, by adjusting that screw you let more un metered air in because it bypasses the afm sensor. Its theoretically the samething as pulling a hose off the accordian hose and putting a filter just a bit more precise. It would raise fuelcut and potentially lean the car out.

i mean if this screw does give you the ability to adjust your fuel ratio that accurately why arent more people using this method as opposed to S-AFC or MAFT Pro?

My proposal to him was to get either
Lex AFM
550's
S-AFC

OR

MAFT Pro Speed Density
550's

instead of just trying to adjust the ecu by doing this. For the money its worth it to just do it right..

Seeing as im going MAFT Pro & probably getting another turbo setup (if i win this or not). i offered him a free turbo if he is right..

Im really interested to see how this turns out someone post up some actual facts not just opinions..

edit:
mkiiina have you checked to see if you are indeed running rich at all?
 
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GrimJack

GrimJack

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Ok, now I understand the debate.

You don't have to tune the car with this setup. The Lexus AFM allows 25% more air to flow into the engine with the same readings to the ECU.

The 550cc injectors provide 25% more fuel, balancing out the changes from the Lexus AFM.

Therefore, the car should run almost exactly the same as it did before, just with more power before it hits fuel cut.
 
boost fiend

boost fiend

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from what i understand and have researched: with 550's and a lex afm, you will be ok on the stock ecu. BUT(you knew this was comming....), the stock ecu and o2 my dissagree.

think about it, with the screw mod on the lex afm you get 25% more air and you get 25 % more fuel with the 550's. but you will most likely need a fuel computer. and a bigger fuel pump(other than stock).

damn, grim jack beat me to it!
 
N

NDBoost

Guest
so.. you shouldn't have to adjust the screw at all. What i dont understand is why the s-afc setup is offered for our vehicles if it shouldn't be needed? I have seen counltess people run S-AFC and swear by needing it. I was always told that you get Lex AFM & 550's and you still need to tune it, it will run rich even if you have the 550's and all supporting fuel mods. Hence the need for MAFT Pro or S-AFC..
 
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lagged

lagged

1991 1JZ
Mar 30, 2005
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NDBoost said:
yes, clear this up.. I for one have always been under the impression you will not be able to tune the car with that adjusting screw on the AFM. Instead you will be doing a more "blind" tuning.. and would never be able to matchthe amount of tuning capability as a MAFT Pro or S-AFC setup would offer you.
My impression of that screw was to adjust your idle fuel ratio of some sort, by adjusting that screw you let more un metered air in because it bypasses the afm sensor. Its theoretically the samething as pulling a hose off the accordian hose and putting a filter just a bit more precise. It would raise fuelcut and potentially lean the car out.

i mean if this screw does give you the ability to adjust your fuel ratio that accurately why arent more people using this method as opposed to S-AFC or MAFT Pro?

My proposal to him was to get either
Lex AFM
550's
S-AFC

OR

MAFT Pro Speed Density
550's

instead of just trying to adjust the ecu by doing this. For the money its worth it to just do it right..

Seeing as im going MAFT Pro & probably getting another turbo setup (if i win this or not). i offered him a free turbo if he is right..

Im really interested to see how this turns out someone post up some actual facts not just opinions..

edit:
mkiiina have you checked to see if you are indeed running rich at all?
Click to expand...

you can play with it till the car idles well, thats in conjunction with an AFPR.

i have a lex AFM for sale with or without electronics and with a custom adjustment screw.
 
jdub

jdub

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boost fiend said:
from what i understand and have researched: with 550's and a lex afm, you will be ok on the stock ecu. BUT(you knew this was comming....), the stock ecu and o2 my dissagree.

think about it, with the screw mod on the lex afm you get 25% more air and you get 25 % more fuel with the 550's. but you will most likely need a fuel computer. and a bigger fuel pump(other than stock).

damn, grim jack beat me to it!
Click to expand...

I'm running a Lex (w/ screw mod) and 550's...no S-AFC, but I do have a PLX wideband O2, a Walbro 255 pump, and an Aeromotive FPR. Lagged is correct, I adjusted the screw to get a good idle, but other than that, the stock ECU compensated for above idle runs. The wideband shows 14.7 at cruise around town and freeway...at idle (sitting at a stop light), it shows 15.8-16.2...at boost, it goes to 11.5-11.8...pretty much normal ops for a stock ECU. Here's something that surprises me...I get 20-22 MPG fuel economy.
 
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ericshere03

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Sweet sounds like a plan then, i will need to buy this for my new turbo...thanks mike :). BTW Shaeff where did you find the stock looking FPR, thats something i have to look into getting, i dont like the big external bulky ones. i would like my motor to appear stock... pure sleeper :)
 
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MKIIINA

Destroyer of Turbos
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im still running hella rich.... my dyno before went south of 10:1 and then when i dyno'd after it was still shooting black out the tail pipe. this was on an sp61gt @ 18 psi @ 320rwhp untuned. this was also on the stock fpr and pump ;)
 
Nick M

Nick M

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Sep 9, 2005
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MKIIINA said:
im still running hella rich.... my dyno before went south of 10:1 and then when i dyno'd after it was still shooting black out the tail pipe. this was on an sp61gt @ 18 psi @ 320rwhp untuned. this was also on the stock fpr and pump ;)
Click to expand...
Did you bypass the J-tube resitrictor?
 
bigal0043

bigal0043

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sry ndboost... when u had asked me if he could tune out fuel cut with the afm screw i thought you meant with the stock afm... part of the bet was to tune out fuel cut with the screw if i remember correctly right? the lexus afm cant do that unless you have a safc or some other fuel management..

all the lexus does it what everyone else said is run 25% higher than stock so that would be around like 18 max boost without a tune? the maftpro will let you run to 29 psi if i remember correctly..

please let me know if got any of this wrong... i am trying to remember this off the top of my head.. trying to save nd his turbo...;)
 
N

NDBoost

Guest
maft pro ftw...

its ok, found out today the oil seals on the turbo are going out woohoo.. let off the gas and its like im making my own fog.. Turbo needs a rebuild and a balance might as well give it up :) I wont have any real use for it anyways, due to the rod knock and all
 
F

freakmachine

New Member
Feb 20, 2006
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la mirada, ca.
Hello boys, any one out there know were i could score one of those hipo screws for my lex afm. also why do some guys run a NA intake cam on a turbo motor. cheers.....................
 
M

MKIIINA

Destroyer of Turbos
Mar 30, 2005
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no i did not drill out the jtube yet. the car is down for some new upgrades (ffi, hardpipes, ic...the usual)

search on the NA cams as its been discussed to all high heaven. as for the screw i think its a crock really, there is a stock screw there that offers much in the way of adjustment and without a afpr, SAFC, or some other tuning aid i think people are just looking for ways to mess with their cars, i know i do :) but i dont see a point to it really
 
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