ok guys help me out here. im running stock turbo with 3in down pipe cold air intake and stock injectors. when ever im going and hit about 10 psi my car acts like im hitting the fuel cut off. any help would be appricated.
11psi of boost and hitting fuel cut off.
- Thread starter jamesmwalker79
- Start date
:nono: Thread will be very entertaining, have you used the search option on this
site yet?
I suggest you look into it..
site yet?
I suggest you look into it..
Mods list?
Hate to break it to ya, but you prolly are hitting fuel cut. And with stock injectors, im going to say its prolly a good thing.
Hate to break it to ya, but you prolly are hitting fuel cut. And with stock injectors, im going to say its prolly a good thing.
Your at the limit for the stock AFM and stock injectors without tuning. If the motor is shutting off for approx 1.5-2 seconds, your hitting fuel cut.
Maybe, how did you raise the boost? Did you raise it a little at a time? Or just pull the wastegate hose off?
It will stop hitting fuel cut when certain parameters are below the threshold of fuel cut.
Fuel cut is based on a few different things, airflow is a major one. Lowering boost pressure lowers airflow.
It is possible lowering it to 9psi will eliminate fuel cut in your vehicle, Though if your have leaky intercooler pipes you may still encounter fuel cut due to air being drawn threw the air flow meter and escaping out of the intercooler piping. This will appear to the TCCS as high airflow even though air is escaping. It will also cause a rich condition under boost.
If you tell us more about your car and what is done to it we can give you more direction. Also knowing your goals would help aswel.
It will stop hitting fuel cut when certain parameters are below the threshold of fuel cut.
Fuel cut is based on a few different things, airflow is a major one. Lowering boost pressure lowers airflow.
It is possible lowering it to 9psi will eliminate fuel cut in your vehicle, Though if your have leaky intercooler pipes you may still encounter fuel cut due to air being drawn threw the air flow meter and escaping out of the intercooler piping. This will appear to the TCCS as high airflow even though air is escaping. It will also cause a rich condition under boost.
If you tell us more about your car and what is done to it we can give you more direction. Also knowing your goals would help aswel.
Maybe, maybe not. I have seen guys claim to run almost 12 PSI on stock injectors, although I do question the accuracy of their gauges. My car hits fuel cut at about 10 PSI, but my point is, no 2 cars are exactly alike. My suggestion to you is either turn down the boost, or go with a bigger fuel system. You can search to find all of what you need.jamesmwalker79;1505125 said:
-AM3
Another MkIII;1505131 said:
A larger fuel supply will only cause a rich condition without having a way to proportionally increase airflow.
Tuning will be required or the traditional "cheat" of the lexus AFM and 550cc injectors.
The problem is the metered airflow and the TCCS, not the fuel system. With a large enough pump and high enough fuel pressure you could make as much power as you would reasonably want on 440cc injectors.
well thats the problem i only got the car 3 days ago some im still trying to figure out what this guy did to it.
Did you get it like that or did it start after you were driving it? Again, more info would help us help you.
Injector size has nothing to do with fuel cut....the sensor behind the airfilter (afm) is what causes fuel cut...
Dear op..
You're hitting fuel cut because your turbo is sucking too much air for stock trim....with simple mods you can raise fuel cut but you must have supporting mods to do this (lex afm, 550cc injectors etc)...
Lower your boost untill fuel cut goes away.
Dear op..
You're hitting fuel cut because your turbo is sucking too much air for stock trim....with simple mods you can raise fuel cut but you must have supporting mods to do this (lex afm, 550cc injectors etc)...
Lower your boost untill fuel cut goes away.
I know, I have all those parts sitting on my desk at home. If you raise fuel cut, you should increase your fuel supply, otherwise, you could go lean, go boom. I gave him the short version and told him he could search, because, hell, we can't just spoon feed it to him, that's too easy.nosechunks;1505134 said:
-AM3
Another MkIII;1505156 said:
well i know about the lexus afm and larger injectors i just have to pony up the cash. i orderd mhg and head bolts yesterday. so funds are limited just need to know if there might be something other then pushing to much boost to her. dont get me wrong here i read for about 7 hours sraight so im not going to ask anything unless i have to and cant find the info myself.
jamesmwalker79;1505175 said:
A boost leak can cause fuel cut but you're seeing such high psi that I doubt you have one....but how and why is boost turned so high?
Is boost set with a boost controler or shimmed wastegate?
You should lower your boost a bit untill fuel cut stops.
gaboonviper85;1505190 said:
im figureing its a shimmed waste gate cause there is no boost control.
im running between 13-15 psi on a 57trim with STOCK INJECTORS, lexus afm, 255 pump, afpr with no fuel cut.. So i dont think the injectors are the problem.. check for boost leaks
Randy954;1505259 said:
that's why fuel cut isn't an issue for you....it's a larger afm.....the afm and only the afm is what causes fuel cut
jamesmwalker79;1505221 said:
Easy enough to find out....take a look and report back if you don't mind
gaboonviper85;1505311 said:
ok i went through it last night no boost leak. so what year and make lexus afm do i need.