Fuel cut on STD ecu Q's

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Little Terror

Fresh Recruit
Hi, Can anyone tell me, when the std ECU does the fuel cut at 0.9 bar boost is it
a) it cuts the power to the fuel pump or
b) does it cut power to the injectors

Please can somebody give me some clarity on this.

many thanks
 
durmz

durmz

Member +
i dont know but i dpnt think its the fuel pump as fuel cut is near enough instant, cutting the fuel pump, all the fuel in the lines would still go through
 
L

Little Terror

Fresh Recruit
The reason I am asking is that if it is the fuel pump then surely if I rewire the fuel pump to an alternative power source then I should be able to bypass the "fuel cut" of the std ecu say for eg if I then boost 1bar. If however it cuts the power to the injectors the fuel would then just return to the fuel cell and no fuel will enter the motor causing instant cut, if the second is the case then there is no way of bypassing without a fuel cut defender.
 
durmz

durmz

Member +
like i say i dont know, but if i had to put money on it, ide say it wasnt the fuel pump, as i dont see how stopping the fuel pump momentarily would cut at the engine straight away
 
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bucketep91

Member +
its not a good idea just removing fuel cut because your hitting it, are you sorting somthing out with your fueling? why not save the hassle and just buy a fcd youl pick 1 up for around 40 to 80 quid. and get it set up properly
 
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superspat

Member +
im wit drumz, cant see how cutting the fuel pump would cause a instant cut to engine, picking my gt up in couple of hours after getting mapped so will ask the guys down there and let u know laterz
 
L

Little Terror

Fresh Recruit
bucketep91 said:
its not a good idea just removing fuel cut because your hitting it, are you sorting somthing out with your fueling? why not save the hassle and just buy a fcd youl pick 1 up for around 40 to 80 quid. and get it set up properly
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Hi Please could you point me in the right directio or link to get one at those prices. I am in Botswana and would therfore have to ship it here. We dont have the luxuary of popping in to a tuning shop in town to get one.

Thanks for the tip
 
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bucketep91

Member +
they pop up quite regularly on here bud, but you cant just whack on a fcd because you are hititng fuel cut. You must get your fuelling sorted too if you want to run boost any higher than fuel cut
 
Jay

Jay

Admin
hardcoreep said:
The ECU cuts the injectors for .08 of a second each cycle.
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Can't really get much more concrete than that. Our resident EP Ninja is on target.

Think of the factory fuelcut as a safety net which stops your engine from being damaged from excessive turbo boost. You'd be wanting to avoid piston damage so keep the boost below fuel cut for now bro.

Jay
 
H

hardcoreep

Member +
LOL! I found it in a Toyota manual and a Toyota tech in Florida confirmed it for me. He also told me the voltage, but I lost it when my PC went down.
 
L

Little Terror

Fresh Recruit
Thanks for the help, I just wanted to run 1.0 bar boost on std ecu and mill, I have been told how to do that here and now you tell me not......confusing..

Anyway I am going to get the FCD and run 14psi, if it breaks I will have a good reason to dig deep and forge the mill, and then go the hog on all the other stuff...ECU, Injectors, pump, brakes and suspension.

Thanks Guys
 
Jay

Jay

Admin
Little Terror said:
Thanks for the help, I just wanted to run 1.0 bar boost on std ecu and mill, I have been told how to do that here and now you tell me not......confusing..

Anyway I am going to get the FCD and run 14psi, if it breaks I will have a good reason to dig deep and forge the mill, and then go the hog on all the other stuff...ECU, Injectors, pump, brakes and suspension.

Thanks Guys
Click to expand...

If you are planning this on stock fuelling I'd advise a JAM FCC then mate, safer than the HKS and so long as you are sensible with the boost it offers what you need.

Have you anyone with wideband/fuelling measurement local?

rb69 said:
Fuel cut is quite clever then really, do any other cars have it?
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Yup, pretty sure that most forced induction setups will have a similar if not identical safety feature in place. Newer cars go into 'limp' mode to prevent you doing the same thing over again.
 
L

Little Terror

Fresh Recruit
Jay said:
If you are planning this on stock fuelling I'd advise a JAM FCC then mate, safer than the HKS and so long as you are sensible with the boost it offers what you need.

Have you anyone with wideband/fuelling measurement local?


We have People in SA (South Africa) about 4 hours drive across the border, I will have to get it checked out there. However I am more and more making up my mind that a full ECU is the way to go with some upgraded Injectors and fuel pump. If I intend to want to boost then 1,2 bar what size injectors should I be looking for. We have a lot of companies here that import cars and motors and have lots of parts that they sell, so I can see if I can get injectors off another motor, maybe like the ones on a 4A GZE. Will this be sufficient??

Also we can get MR Turbo management systems in SA . You can go and check it out at the following link.
http://www.mrturbo.co.za/index.php?option=com_virtuemart&page=shop.browse&category_id=7&Itemid=1

Thanks for the assistance, trust me I really appreciate it.
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finx

finx

Member +
4agze injectors are slightly bigger and can be good for just a fpr and pump set up or mazda gtx injectors. but if your going the whole hogg and doing it properly with an aftermarket ecu then some 440 e39a mitsi vr4 injectors will do the trick nicely.
if you plan on running massive boost some mitsi evo 550cc's are the ones to go for, but some people find it hard to trim enough fuel out on these to get a good idle mixture.
 
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