Lexus AFM question?

[rnoswal]

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

[Burn N' Up]

The LS400 V-8 seems to be the winner

[djalkyd]

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.

[stumpjumper]

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

[ddmcse]

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

[rnoswal]

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

[djalkyd]

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.

[ddmcse]

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

[rnoswal]

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

[ddmcse]

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 .