Steve Posted August 31, 2005 Share Posted August 31, 2005 Am looking into the single turbo route. Have already got 650cc Injectors, HKS 264 in/ex cams, emanage. Would i need a FPR for the single?? Thanks Link to comment Share on other sites More sharing options...
Clarkey Posted August 31, 2005 Share Posted August 31, 2005 Yes - if you intent to run high boost. 1.4 Bar for example. Link to comment Share on other sites More sharing options...
Steve Posted August 31, 2005 Author Share Posted August 31, 2005 Yes - if you intent to run high boost. 1.4 Bar for example. I do intend that sort od boost yes. Thanks for the quick reply. Can anybody recommend one? Aeromotive etc Link to comment Share on other sites More sharing options...
Ian C Posted August 31, 2005 Share Posted August 31, 2005 Yes - if you intent to run high boost. 1.4 Bar for example. Hmm. Interesting. Can you let us know why? -Ian Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 31, 2005 Share Posted August 31, 2005 If the injectors are adequately sized for your desired output the stock FPR is perfect. As is the rail. Only big BHP engines need to mod these. Link to comment Share on other sites More sharing options...
Clarkey Posted August 31, 2005 Share Posted August 31, 2005 Hmm. Interesting. Can you let us know why? -Ian Only from doing various searches & reading threads on here .. that was all. Not out of a techie knowledge lol .. My understanding would be for additional safety. Link to comment Share on other sites More sharing options...
b_have Posted August 31, 2005 Share Posted August 31, 2005 I would go for the fpr just for the option to adjust if inj duty cycles get a little high. Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 1, 2005 Share Posted September 1, 2005 Size the injectors to run the power output desired at a sensibly low duty rate at manufacturers recommended fuel pressure, nevr fudge fuelling by upping line pressure to compensate for marginal, or too small a size, injectors. If running at stock pressure the stock FPR is fine for even big HP engines, it's a fallacy that you "must have" a bigger FPR, or an adjustable one. Most aftermarket ones have less control and reliability than OE ones. IMO. Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 1, 2005 Share Posted September 1, 2005 The stock FPR is fine to a point. Link to comment Share on other sites More sharing options...
b_have Posted September 1, 2005 Share Posted September 1, 2005 Size the injectors to run the power output desired at a sensibly low duty rate at manufacturers recommended fuel pressure, nevr fudge fuelling by upping line pressure to compensate for marginal, or too small a size, injectors. If running at stock pressure the stock FPR is fine for even big HP engines, it's a fallacy that you "must have" a bigger FPR, or an adjustable one. Most aftermarket ones have less control and reliability than OE ones. IMO. Yup, in a perfect world. I just like the option to adjust when developing the map. Two or three psi can make a big difference. Link to comment Share on other sites More sharing options...
TLicense Posted September 1, 2005 Share Posted September 1, 2005 Are you using fuel line base pressure to basically "fine tune" the injector sizing then? Also , I've found that the OEM one, which I'm sure is as good as CW says, has the limitation that it supplies fuel at the base pressure that the stock injectors were calibrated for. Not all injectors are calibrated to run the same pressures. ie when a manufacturer says they have 550cc injectors, that is at a specific pressure, (Which there is currently no standard for, so could be 2.5,3, or even 4 bar) so if you were to run them at anything other than that base pressure, you would have an injector that would flow too much, or worse, not enough fuel as you were expecting it to. I say source injectors that are man enough for the job (give yourself some leeway for upgrades - but don't go silly with it) and then find out if they were flow tested at the same base pressure as the stock system (I'd be suprised if you found any that were!). If not then get yourself adjustable regulator to set your base pressure to the pressure they were tested at. IMHO the only complete way to set the system up. edit to add:- Just spotted that CW mentioined the stock FPR was good if you were running at the stock base pressure Link to comment Share on other sites More sharing options...
Steve Posted September 1, 2005 Author Share Posted September 1, 2005 Well i am looking at the T67 BL kit. Ian you have this kit, is yours running a FPR??? Link to comment Share on other sites More sharing options...
Ian C Posted September 1, 2005 Share Posted September 1, 2005 Yes it is - but I needed one as I junked the whole stock fuel system barring the return pipe. This was before the single-walbro-plus-PE650cc-injectors setup was thought of... Cost me a fortune doing a twin in-tank pump setup with -8 main hose and a twin entry HKS fuel rail... If you have to have one, get an Aeromotive. My 720cc injectors run at 81% duty to give 11.4:1 afr at 1.4bar on a T67. So you'd need about 90% duty on 650's to acheive the same delivery of fuel - about as far as you'd want to push them but they will do it -Ian Link to comment Share on other sites More sharing options...
Steve Posted September 2, 2005 Author Share Posted September 2, 2005 Thanks Ian Link to comment Share on other sites More sharing options...
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