fuel pump upgrade

could anyone help me . im just about to bpu. but do i need to change my fuel pump the car is a import . a bit of a grey area to me.

will you stick with the 440cc injectors??

will you stick with the 440cc injectors??

For BPU there is no need to change the injectors.

It is advisable to change the fuel pump to a Walbro pump. Ask most of the traders on here, they will sort you out.

yep you will need a fuel pump. The injectors should be fine.

For BPU there is no need to change the injectors.

 

It is advisable to change the fuel pump to a Walbro pump. Ask most of the traders on here, they will sort you out.

At 1.2 bar they'll be almost maxed out. I'd at least stick some 550s on there for prolonged running at 1.2 bar.

It would also be a good idea for the OP to replace his fuel pump with a Walboro or a Bosch 044 (maybe a little overkill).

i will be keep 440s in i think . but would the car run better with 550s

i will be keep 440s in i think . but would the car run better with 550s

you would have a little bit of safety room as 550cc injectors would not run as close to their maximum capacity.

what do you mean by maximum capacity. the amount of fuel going in

what do you mean by maximum capacity. the amount of fuel going in

Yes.

Ideally you'd like to be around 80% duty cycle (the %age of maximum your injectors are working at). At 1.2 bar 440s will be close to 100%.

If you breach 100% you will see detonation, which kills engines. Better to be safe IMO.

thanks for that i think i will change to 550s what sort of price would the injectors be

thanks for that i think i will change to 550s what sort of price would the injectors be

I'm not sure how much Toyota will charge. Bear in mind if you buy the ones from the UK/US spec you'll need a resistor pack to change the impedance of the injectors.

95%+ (at a guess) bpu cars use the standard 440cc injectors and run just fine. It's adviable to get an AFR gauge to keep a check on things. Mine ran fine on the 440's for 3.5 years and 36k miles using 1.2 bar daily.

If you change injectors you will also need to install a mapable ECU and then get it mapped, it is not a cheap excercise.

Also if using 550's from a UK spec you would need a resistor pack and then wire it into the stock engine harness.

homer did you have a fuel pump up grade.

homer did you have a fuel pump up grade.

Yes, thats a must have. I used a walbro on the TT which was also fine after going single (550bhp, so it's more than enough for BPU).

Have you read this: bpu (click the blue text)

95%+ (at a guess) bpu cars use the standard 440cc injectors and run just fine.

Absolutely, I don't know where this sudden worry about using 440 injectors at BPU has come from!

I'd hazard a guess that most BPU still use the stock fuel pump too, mine does.

Absolutely, I don't know where this sudden worry about using 440 injectors at BPU has come from!

My Apexi Power FC commander

I didn't change either the fuel pump or injectors when I went BPU and the car has run with no problems for just short of 10000 miles.

My Apexi Power FC commander

Stop listening to it then.

Stop listening to it then.

Just because your injectors are at 95% duty cycle at 1.2 bar doesn't mean the injectors are sitting at 95% duty cycle all the time, its only when your at WOT so I cant see it stressing the injectors all that much more.

At 1.2 bar 440s will be close to 100%.

At 1.0bar the 440's are at 100% duty - and the engine runs pig rich. Upping the boost to 1.2bar actually leans the mix off to a better ratio.

If you breach 100% you will see detonation, which kills engines.

I don't really have a nice way of saying this but that's not only wrong but technically meaningless as well You can't breach 100% duty cycle. It's not some company management phrase, it's a physical measurement of how open they are per 4 stroke cycle. 100% = always open, they can't be "more opener".

There are many things that lead to detonation, but your injectors slipping into another dimension isn't one of that's been noted yet. Of course, running lean is one, but no BPU Supra running at 100% duty has yet achieved this (purely on the basis of that duty cycle alone - plenty have gone bang for other reasons)

-Ian

No but they`ve been known to run lean as the 2nd turbo comes into life.

No but they`ve been known to run lean as the 2nd turbo comes into life.

I came back here to check something else and found this. Can you provide examples please because I've not heard of this except with unmapped parallel conversion hacks.

-Ian

I came back here to check something else and found this. Can you provide examples please because I've not heard of this except with unmapped parallel conversion hacks.

 

-Ian

I've heard of it but would also be interested in hearing some definitive thoughts on it as mine runs pig rich everywhere else and I just assumed it would be fine when the 2nd turbo came in.

I don't really have a nice way of saying this but that's not only wrong but technically meaningless as well You can't breach 100% duty cycle. It's not some company management phrase, it's a physical measurement of how open they are per 4 stroke cycle. 100% = always open, they can't be "more opener".

 

There are many things that lead to detonation, but your injectors slipping into another dimension isn't one of that's been noted yet. Of course, running lean is one, but no BPU Supra running at 100% duty has yet achieved this (purely on the basis of that duty cycle alone - plenty have gone bang for other reasons)

 

-Ian

you're right of course. Breach wasn't the right word for what I was trying to say.