mark newman Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Luxluc Posted January 31, 2009 Share Posted January 31, 2009 will you stick with the 440cc injectors?? Quote Link to comment Share on other sites More sharing options...
Steve Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Guigsy Posted January 31, 2009 Share Posted January 31, 2009 yep you will need a fuel pump. The injectors should be fine. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 31, 2009 Share Posted January 31, 2009 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). Quote Link to comment Share on other sites More sharing options...
mark newman Posted January 31, 2009 Author Share Posted January 31, 2009 i will be keep 440s in i think . but would the car run better with 550s Quote Link to comment Share on other sites More sharing options...
Luxluc Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
mark newman Posted January 31, 2009 Author Share Posted January 31, 2009 what do you mean by maximum capacity. the amount of fuel going in Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
mark newman Posted January 31, 2009 Author Share Posted January 31, 2009 thanks for that i think i will change to 550s what sort of price would the injectors be Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
mark newman Posted January 31, 2009 Author Share Posted January 31, 2009 homer did you have a fuel pump up grade. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 31, 2009 Share Posted January 31, 2009 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) Quote Link to comment Share on other sites More sharing options...
Thorin Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 31, 2009 Share Posted January 31, 2009 Absolutely, I don't know where this sudden worry about using 440 injectors at BPU has come from! My Apexi Power FC commander Quote Link to comment Share on other sites More sharing options...
DaveR Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Thorin Posted January 31, 2009 Share Posted January 31, 2009 My Apexi Power FC commander Stop listening to it then. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 31, 2009 Share Posted January 31, 2009 Stop listening to it then. Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted January 31, 2009 Share Posted January 31, 2009 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. Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 2, 2009 Share Posted February 2, 2009 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 Quote Link to comment Share on other sites More sharing options...
bignum Posted February 2, 2009 Share Posted February 2, 2009 No but they`ve been known to run lean as the 2nd turbo comes into life. Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 15, 2009 Share Posted February 15, 2009 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 Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted February 15, 2009 Share Posted February 15, 2009 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. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted February 15, 2009 Share Posted February 15, 2009 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. Quote Link to comment Share on other sites More sharing options...
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