fuel cut at 16psi with a lex afm?!?! wtf?!?!

[hottscennessey]

I'm with Jdub, you could have a boost leak... as JDUB said, and I'd suggest getting tuned, because with my lexus and 550's i was in the 9:1 AFR. Tune it with an SAFC or something similar and you wont hit fuel cut as often, or at all.

 

[antman]

Hey...I know, but sometimes saying it a different way will help him understand

werd!

 

[MRSUPRA]

I could run up to about 19psi with my Lex AFM before I hit fuel-cut before I was tuned and before I had the HKS FCD on. Now I can run past 29psi with the Fuel cut defender and AFC. Without a FCD and only a AFC, you could probably raise the fuel cut a few psi by reducing the AFM signal with the AFC (or known as taking out fuel).

 

[jetjock]

by the way, fuel cut is really spark retarding in our cars. you can look it up on Mitchell on demand or alldata.

Just shows how aftermarket data can be wrong. In this case injection is stopped. It's one of 10 possible actions that are programmed as the ecu's Fail Safe mode.

 

[jdub]

Just shows how aftermarket data can be wrong. In this case injection is stopped. It's one of 10 possible actions that are programmed as the ecu's Fail Safe mode.

That's what I thought, but wasn't 100% positive...thanks JJ
Fuel cut is too abrupt to be a timing retard

 

[jetjock]

I've never experienced it in anger but I know from a simluation what happens and Toyota is also clear about it. A signal generator and frequency counter connected in place of the AFM's output offers relief from boredom on a Saturday afternnon

 

[jdub]

I've never experienced it in anger but I know from a simluation what happens and Toyota is also clear about it. A signal generator and frequency counter connected in place of the AFM's output offers relief from boredom on a Saturday afternnon

Where do you get the tech info on how the ECU works JJ?
I'm thinking a little light reading is in order :naughty:

 

[supramad77]

I just did the swap last week for 550s and lexus afm with the afpr kit. The car ran so badly i had to take of the 550s and afm off as it would not idle nice and just smoked out the whole street. I put in 3 gallons of fuel and the car ate it all up in under half hour just idling on my drive. The petol melted the tarmac on my drive where it leaked out of the joint in my exhaust.
I have a safcii and digital boost control to wire in to run this, but at this point i don't know what went wrong.

 

[WeDgE]

^^ Sounds like a boost leak.

 

[MRSUPRA]

/\Or bad AFM electronics.

 

[b005t3d]

I just did the swap last week for 550s and lexus afm with the afpr kit. The car ran so badly i had to take of the 550s and afm off as it would not idle nice and just smoked out the whole street. I put in 3 gallons of fuel and the car ate it all up in under half hour just idling on my drive. The petol melted the tarmac on my drive where it leaked out of the joint in my exhaust.
I have a safcii and digital boost control to wire in to run this, but at this point i don't know what went wrong.

i swapped out the internals that came with the afm for the ones that were stock in my car and it stopped that smoking crap. works fine now. except for the only being able to get 16psi thing.