paul21uk Posted June 30, 2013 Share Posted June 30, 2013 Hey guys as above. As there's mixed answers in this. Link to comment Share on other sites More sharing options...
Rich.2211 Posted June 30, 2013 Share Posted June 30, 2013 (edited) I've been wondering this myself but after a chat with Noz I would say 440bhp with a tiny bit to spare. I suppose a lot of it depends on fuel pressure. Edited June 30, 2013 by Rich.2211 (see edit history) Link to comment Share on other sites More sharing options...
Abz Posted June 30, 2013 Share Posted June 30, 2013 I believe at full BPU the injectors are close to running at maximum fuel duty. If you are looking to run anything further I'd get larger injectors. BHP as above though at 440 I'd say it close to max. Link to comment Share on other sites More sharing options...
thetrashcanman Posted July 1, 2013 Share Posted July 1, 2013 (edited) I'd say the maximum is really around the 400bhp mark tbh as you should never really run the injectors to there maximum and generally BPU on a J spec supra is around the 400bhp mark, 440bhp is more likely to occur on a UK spec supra but that has 550cc injectors and I believe a larger fuel pump Edited July 1, 2013 by thetrashcanman (see edit history) Link to comment Share on other sites More sharing options...
Rich.2211 Posted July 1, 2013 Share Posted July 1, 2013 Probably worth mentioning when I'm talking about 'max' I don't necessarily mean they're safe at that level, just what they could acheive at full duty. I think 'thetrashcanman' has it pretty much summed up Link to comment Share on other sites More sharing options...
Noz Posted July 1, 2013 Share Posted July 1, 2013 If you upgrade the injectors, you should upgrade the fuel pump. Link to comment Share on other sites More sharing options...
Swampy442 Posted July 1, 2013 Share Posted July 1, 2013 The generally accepted rule for JZ injectors is 1hp per cc, minus a bit of duty for safety, around 400hp. Link to comment Share on other sites More sharing options...
Sheefa Posted July 1, 2013 Share Posted July 1, 2013 80% DC is the recommended max, but you can push this further. At 90% you are running max of around 400hp. An Apexi AFC or other variants can help in managing out lean spots. My Supra was running approx 440-460bhp and the AFR's were spot on. Link to comment Share on other sites More sharing options...
paul21uk Posted July 1, 2013 Author Share Posted July 1, 2013 well this just proves my theory as im running a 1jz single. im dynoing 488.9BHP on 440cc injectors. im also running 10.0 on my aem wideband afr my mate also dynod the same day after me on 440s and dynod at 508.4 on a piping hot day and running 10s on afr again on a piping hot day. - - - Updated - - - dynod yesterday Link to comment Share on other sites More sharing options...
paul21uk Posted July 1, 2013 Author Share Posted July 1, 2013 at 1.1 bar also Link to comment Share on other sites More sharing options...
hodge Posted July 1, 2013 Share Posted July 1, 2013 I've seen cars make a little over 440hp with these in but I wouldn't advise it. It's usually calculated at 1cc per hp. Most mappers won't push injectors past say 90% ish. Link to comment Share on other sites More sharing options...
Guest supraturbotimmy Posted July 1, 2013 Share Posted July 1, 2013 yeah but a whos says the toyota ecu will run higher then 85% duty.... in all their testing and their reliability record do you think they would over make the duty over the recommended level :\ injectors after flow cleaning will show what they flow and at what pressure iirc rc injectors state 85% duty for the flow rates btw it was me at 508 bhp. Link to comment Share on other sites More sharing options...
Sheefa Posted July 1, 2013 Share Posted July 1, 2013 Let's be honest, it's pretty easy to just get a set of drop in 650cc's or alike (if J-spec) and run the boost and fuelling safely. Link to comment Share on other sites More sharing options...
thetrashcanman Posted July 1, 2013 Share Posted July 1, 2013 Sheefa said: Let's be honest, it's pretty easy to just get a set of drop in 650cc's or alike (if J-spec) and run the boost and fuelling safely. +1 to that its a relatively simple thing to do, I would have thought any do it yourself mechanic could do Link to comment Share on other sites More sharing options...
hodge Posted July 1, 2013 Share Posted July 1, 2013 Sheefa said: Let's be honest, it's pretty easy to just get a set of drop in 650cc's or alike (if J-spec) and run the boost and fuelling safely. Agreed. Link to comment Share on other sites More sharing options...
Swampy442 Posted July 1, 2013 Share Posted July 1, 2013 paul21uk said: well this just proves my theory as im running a 1jz single. im dynoing 488.9BHP on 440cc injectors. im also running 10.0 on my aem wideband afr my mate also dynod the same day after me on 440s and dynod at 508.4 on a piping hot day and running 10s on afr again on a piping hot day. Unless youre running massive fuel pressure, that shouldnt be possible. Link to comment Share on other sites More sharing options...
hodge Posted July 1, 2013 Share Posted July 1, 2013 paul21uk said: well this just proves my theory as im running a 1jz single. im dynoing 488.9BHP on 440cc injectors. im also running 10.0 on my aem wideband afr my mate also dynod the same day after me on 440s and dynod at 508.4 on a piping hot day and running 10s on afr again on a piping hot day. - - - Updated - - - dynod yesterday Out of interest Paul, who mapped the cars and what ECU do you have? Link to comment Share on other sites More sharing options...
paul21uk Posted July 1, 2013 Author Share Posted July 1, 2013 hodge said: Out of interest Paul, who mapped the cars and what ECU do you have? Supraturbotimmy street mapped it I'm using a apexi safc and a stock Ecu. - - - Updated - - - My fuelling is as rich as it comes. So there's nothing not safe about running it Link to comment Share on other sites More sharing options...
paul21uk Posted July 1, 2013 Author Share Posted July 1, 2013 Swampy442 said: Unless youre running massive fuel pressure, that shouldnt be possible. Nope still on standard fpr and fuel pump at mo I have a walbro to place it just not got round to yet Link to comment Share on other sites More sharing options...
Wez Posted July 1, 2013 Share Posted July 1, 2013 paul21uk said: well this just proves my theory as im running a 1jz single. im dynoing 488.9BHP on 440cc injectors. im also running 10.0 on my aem wideband afr my mate also dynod the same day after me on 440s and dynod at 508.4 on a piping hot day and running 10s on afr again on a piping hot day. - - - Updated - - - dynod yesterday Can you post both dyno plots showing the correction values? Link to comment Share on other sites More sharing options...
paul21uk Posted July 2, 2013 Author Share Posted July 2, 2013 Don't have them I only have the power level of the WHEEL hp at 436.6 and the FLY at 488.9 don't have the graphs at min as at work till Friday Link to comment Share on other sites More sharing options...
Dnk Posted July 2, 2013 Share Posted July 2, 2013 I have 6 new 550 uk spec injectors for sale Link to comment Share on other sites More sharing options...
paul21uk Posted July 2, 2013 Author Share Posted July 2, 2013 Dnk said: I have 6 new 550 uk spec injectors for sale Ah right do they come with resistor I don't want them but I may no someone else Link to comment Share on other sites More sharing options...
Dnk Posted July 2, 2013 Share Posted July 2, 2013 paul21uk said: Ah right do they come with resistor I don't want them but I may no someone else No i just have the injectors, still in their protective bags unopened from Toyota, i was going to fit them to my car but i sold it a couple of months ago. Link to comment Share on other sites More sharing options...
Guest supraturbotimmy Posted July 2, 2013 Share Posted July 2, 2013 how much you asking mate? Link to comment Share on other sites More sharing options...
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