Lexus AFM question?
 

I know that the Lexus AFM along with the 550 injectors are a popular upgrade. I would like to know if the AFM off of any Lexus is the larger one or is it only off the V-8 engines. I have found several different types of Lexus AFM's starting from a 93 Lexus 300 with a 2jz engine and wondered if even that one was considered the larger upgrade and is the same as all the "larger" AFM's off the Lexus cars.

This is for my turbo by the way and I would like to make this upgrade. I can buy local or I can go ebay, but I was just curious about if there was any difference with any of the Lexus AFM's and which ones to look for and which ones not to use, if any.

Thanks

Russ
87 Turbo

The LS400 V-8 seems to be the winner

i just got the ls400 afm and talk about a big difference. i am just running stock boost and stock injectors but it made a big difference on how smooth the car actually runs.

there is a part number for the afm that you need which is

22204-42011

the actual afm is bigger it seems to be about 3".

i got mine from a scrap yard, i called lexus and they wanted over a $1000 for it. the only reason i didn't want to get it off e-bay was incase it didn't work or something then i could return it.

i will be getting bigger injectors and an s-afc soon so i can up the boost.

Will the ls 400 afm just plug into the stock wiring or will that need to be modified too?

you remove the wiring (black box)off the lexus afm and put the supra's afm block box onto it .
you'll need to get the 25% larger diameter afm inside the accordin hose that connects to the turbo.
--sounds easy

you really shouldn't add a lexus afm without knowing exactly what you are doing .

you should have an air/fuel gauge installed
you should have larger injectors installed

Wait a minute, I was always under the assumption that it is a plug and play item. I have never heard of anyone having to swap out the black box from one to the other. I am pretty sure they both have the same plugs and then yes the upgrade for the injectors.

Anyone outhere that has this mod? Besides shoving the larger afm into the smaller bellows, that should be if for that.

Russ

that is what i am saying i did. i just plugged it in and it works great. better than stock even.

i took my a/f today on the smog dyno at school and the stock injectors are fine at 5psi boost, which i am running right now.

so for the record, the 94 LS400 afm with the lexus sensor does work with stock injectors and low boost. no need to swap sensors in my book just use the one that comes on it.

it made sense to me to use the stock box .it probably doesn't matter it just eliminates wondering if they are different if you have a problem .
i really wouldn't recommend using the lexus afm with stock injectors .
i'm sure it will work but the question is for how long and if you don't have an a/f meter and you don't get on a school smog dyno every day how will you know if you've slipped into lean .
or at how many lbs does the mixture get too leaned
i guess once you've poured some blood, sweat and tears on the block you have more respect for the car

Well, I think he has respect for his car just as you do. I also think the the Lexus afm does of course allow for more boost but I also think that up to the limits that the original let the car boost, is also a safe limit for the larger Lexus afm. Sure it will allow more air, but 10lbs boost is still the same now matter how big the afm is. But because it will allow much more boost than stock you have to limit your boost to a safe level, but bigger injectors and fuel pump are still the way to go to be safe I realize.


Correct me if I am wrong though.

Russ

i didn't mean he has no respect for his car .
i mean that once you have to taken the sucker (engine) completely apart and gone through the agony and cost of rebuilding , you are left way more cautious and less tempted to beat the crap out of it .

extreme heat is the enemy
lean = heat

Nice site, ddmcse. And the car sounds awesome :drool:

Sooo ... afm + injectors from a Lexus ls400 v8 ? Any designation about the engine ... told it's " the 5.0L, " but others say they use a MAP sensor ...

thanks !
sounds like DIESEL truck idling doesn't ?
Sooo ... afm + injectors from a Lexus ls400 v8 ? no .

i do not know about the lexus injectors working

it's the lexus air meter you want .

http://suprasonic.org/sonic/sonic.htm

go here scroll down


ALSO

for those that might also be wondering about the electronics of each AFM

quick search and came across this
-----------------------------------------------------------------------------------------------------------------------
Hello all! Its been a long time since I've written in, but I'm still
here
> > quietly enjoying the conversation in the background...
> >
> > Anyhow, as the subject says, I would like to get a definitive answer on
the
> > Lexus AFM electronics.
> >
> > My current (stock) AFM is on the fritz, and needs to be replaced. I want
to
> > do the Lexus upgrade someday, but not right now. -So, I'm thinking I
might
> > be able to get a whole Lexus AFM, then swap the electronics over to my
> > present AFM housing until such time as I want the larger Lexus AFM
> > housing....
> >
> > I've read conflicting stories on various websites. Some people say the
Lexus
> > AFM electronics are identical. Others say you must swap out the Lexus
AFM
> > electronics with your Supra's stock electronics.
> >
> > Which is correct? Is it possible that some Lexus AFMs have electronics
to
> > match our own, while others do not?
>
> I have used the electronics interchangeably without any apparent issue,
but I
> nore Reg Reimer's comments from here...
> http://www.supras.com/~riemer/lexusr...exusnotes.html which says "The
> Karman Vortex Electronic Sensor The electronics module on the Supra and
the
> Lexus air flow meters have numerically different part numbers but are
> dimensionally exactly the same size. Due to the part number difference on
the
> electronics module on the 7M-GTE and Lexus air flow meter, I only
recommend the
> use of the aluminum body of the Lexus air flow meter for this upgrade.
The
> electronic module from the stock 7M-GTE's air flow meter should be mounted
onto
> the Lexus air flow meters larger aluminum body with the three small
original
> Phillips mounting screws".
>
> Your choice I guess.
>
> Cheers
>
> Tony

i totally agree with you but what i am saying is that i lowered my boost to make up for the amount of air going in. stock boost is 8psi and i went down to 5psi. i ran on the dyno with a wide band under full load in all gears and the leanest it got was 14.9 to 1, when 14.7 to 1 is most desirable.

this week i am adding the injectors and the adjustable fpr with the s-afc so i can crank the boost up.

but i totally agree on the blood sweat and tears. i have been building my other car for years and have built many other peoples cars in the past so i know what you mean when you grenade or melt down internals.

i also thought you would have to use the stock sensor but i found out that the car responds better with the lexus sensor. for some reason unknown to me but it works.