How is this Possible To lean with Lexus Mod?

[Koenigturbo]

How is it possble that The car is lean?? The plugs are whiteish, the tech said that that would cause a lean misfire. It only missfire's at idle.
The only mods I have are 550 injectors, Lexus A.F.M. and 3" exhaust and one cat and 57 trim wheel for the ct/26. he also mentioned fuel pressure,(maybe) Would I have to hook up a A.FC. (my Greddy Ultimate) to add more fuel?

 

[IJ.]

Do you have any way to monitor FP?

 

[Koenigturbo]

Do you have any way to monitor FP?

No, do you think thats what i need??

 

[IJ.]

Well you need to baseline the combination to see what it's actually doing.

It could just be the 20 year old pump laying down.

Without some real data you're just guessing and will end up playing musical parts until you stumble on it, this approach is both expensive and time consuming and can end up trashing a motor

Even if you just buy a cheap FP guage run it's line out the side of the hood and tape the gauge down so it can be seen from the drivers seat and go for a drive taking notes of what the FP does.

 

[Koenigturbo]

Well you need to baseline the combination to see what it's actually doing.

It could just be the 20 year old pump laying down.

Without some real data you're just guessing and will end up playing musical parts until you stumble on it, this approach is both expensive and time consuming and can end up trashing a motor

Even if you just buy a cheap FP guage run it's line out the side of the hood and tape the gauge down so it can be seen from the drivers seat and go for a drive taking notes of what the FP does.

You are not saying I need a wahlbro pump, Your only saying I need to see where my presure is, it could be like you said "A 20 year old pump laying down" so my pump's "tried"?? Are you saying that it's possible that I may need an "Areomotive" fuel regulator? Thank you "Ij"

 

[ForcedTorque]

Aeromotive Kit - $250 Walbro - $100 Driftmotion

 

[IJ.]

Koenig: What I'm saying is to get some data on what it's actually doing so you can make an informed decision and NOT use the shotgun approach of just replacing a shitload of parts that may or may not be the root cause

 

[7MGTEsup]

Is your fuel pressure regulator getting good vac/boost??

 

[Koenigturbo]

Is your fuel pressure regulator getting good vac/boost??

Do'nt know yet, I need to bring it to a tech.

 

[suprahabsfan]

fuel management?

 

[gofastgeorge]

How is it possble that The car is lean?? The plugs are whiteish, the tech said that that would cause a lean misfire. It only missfire's at idle.
The only mods I have are 550 injectors, Lexus A.F.M. and 3" exhaust and one cat and 57 trim wheel for the ct/26. he also mentioned fuel pressure,(maybe) Would I have to hook up a A.FC. (my Greddy Ultimate) to add more fuel?

A lexus AFM with 550 injectors is NOT a direct swap......
I see no mention of any fuel managment up-grade such as a Apex-i Super-AFC.

Most likely the 550s & Lexus AFM is the cause of your lean condition.
Everything I have seen is that 680cc injectors come closer to being correct for the Lexus AFM,
but even they need a little tweaking.

 

[MKIIINA]

A lexus AFM with 550 injectors is NOT a direct swap......
I see no mention of any fuel managment up-grade such as a Apex-i Super-AFC.

Most likely the 550s & Lexus AFM is the cause of your lean condition.
Everything I have seen is that 680cc injectors come closer to being correct for the Lexus AFM,
but even they need a little tweaking.

you are smoking crack. heres the mentality behind the lex/550s swap:

lex afm = 25% larger than stock stock afm
550s = 25% larger than the stock 440s

it balances out.

koenig - check your pump as IJ said, you may be able to do the 12v mod, or swap in a walbro. check your FP . Did you reset your ecu when you completed the swap?

 

[Koenigturbo]

you are smoking crack. heres the mentality behind the lex/550s swap:

lex afm = 25% larger than stock stock afm
550s = 25% larger than the stock 440s

it balances out.

koenig - check your pump as IJ said, you may be able to do the 12v mod, or swap in a walbro. check your FP . Did you reset your ecu when you completed the swap?

Hey mkiii

Thanks for your reply, Everything is making sense now, No, I haven't checked my f.p. yet,.. I will though. I did mentioned that I have a Greddy Ultimate, I just haven't hook it up,, maybe that's I need to do. Sincr it will add fuel as far as I know, it will. No, I haven't reset my e.c.u..... I don't follow,... How do you do that? Disconnect my battery, wait few minuttes and reconnect??
Sounds to me you guys are saying check f.p. first, if bad, get a walbro. if presure is to high or too low, then get a A.F.P.R.
Also, Go fast thank you for your reply, I welcome all replys

 

[jdub]

you are smoking crack.

QFT :biglaugh:

Koenig - You want accurate info or you'll just start chasing your tail...trust me

To reset the ECU, all you have to do is pull the EFI fuse in the engine bay box for about a minute or so.
Disconnecting the battery will work too.

 

[Koenigturbo]

QFT :biglaugh:

Koenig - You want accurate info or you'll just start chasing your tail...trust me

To reset the ECU, all you have to do is pull the EFI fuse in the engine bay box for about a minute or so.
Disconnecting the battery will work too.

Hey J dub
I was hopping you'd come around,..... thanks to everyone that any input at all!!! It all helps!!!.....Thanks!!

 

[gofastgeorge]

lex afm = 25% larger than stock stock afm
550s = 25% larger than the stock 440s

it balances out.

Not quite.......
Before the S-AFC, people were using a long adjustment screw in the Lexus to get the fuel delivery rich enough.
Problem was that it restricted air flow across the entire range,
and the damn screw cost $100.

But with the S-AFC, one can just dial up the fuel in the lower RPM bands.

 

[MKIIINA]

if you look at the stock afm you will see that it also has a passage in it with a screw. most people don't ever touch it as there isn't a need to.

before the safc there was the gcc which did the same setup, the safc is more advanced and can do a better job of making fine adjustments.

the lex afm has a larger opening all around. try and put a stock accordian hose on a lex and stock afm, i have and its a bitch due to the larger radius.

might want to read up some more on the afm.

 

[jdub]

Then tell me George...why is it I run rich at boost with the Lex/550 combo? And, I am not running any fuel control at all...no S-AFC, nada. All I have is an AFPR with it set to 27 psi with the vac line attached. No fancy (worthless) screw either...just the one that came with the Lex. The whole reason this set-up works is for the reason MKIIINA stated...the increase in un-metered air (look at the lower passage size difference) is also exactly why it doesn't run even more rich with with the 550's.

This mod has been around forever...if anything, you will run rich with it on 550 injectors...680's would be even worse, to the point of a rich misfire at boost. Fuel control is a bonus, but is not required on the Lex/550 set-up.

Koenig - test your fuel pressure (at minimum) per the TSRM...the way IJ told you is even better so you can see what happens at boost. I would invest in a WB O2 to see if you are in fact running lean or not.

 

[Koenigturbo]

A little side note: I just remembered I did reset my e.c.u. when I primed my turbo: So that would let me to believe that it's fuel pump and/or I need a A.F.P.R.

 

[Koenigturbo]

Koenig - test your fuel pressure (at minimum) per the TSRM...the way IJ told you is even better so you can see what happens at boost. I would invest in a WB O2 to see if you are in fact running lean or not

o.k. J Dub, I'll do that, As I was saying to mkiii na I would have to hook up my Greddy Ultimate to hook up a wbo2, as far as I know you can't run a wbo2 with a stock e.c.u.,. (can ya)? I was just gonna bring it to a shop that can read a.f.r. and they can tell me if I'm rich/lean at idle/ boost. From what you guys been telling me it really sounds like I need a a.f.p.r. and/or walbro
I'm a little afaid to tell them (they a smog shop) that I have the Lexus mod and the 550's,.. I'd really like to pass smog. They already asked me if I did any mods,.. I didn't say any thing (dead give away)
"J Dub" I really appreciate your help and evryone else's THANK YOU!!!!