Started by jvanzyl, December 2, 2022, 10:55
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Quote from: Nvy on December 2, 2022, 17:28FIC ~ 300 quids from Paul, you get nice packaging plus a sheet to make the tune easy.
Quote from: threepot on December 6, 2022, 11:13Stock 320's would be too small..... 90% duty cycle / 45 psi rail = max of about 190bhp flywheel - thus why they are in a stock 2ZZ engine.It all depends what you are shooting for.Bigger injectors have less control at low flow rates, thus your idle and tip-in/cruise is hard or even impossible to achieve accuracy, thus you fall into all that popping and banging round urban areas which is pretty cockend, and running off stoch with its fuel wastage, bore wash and oil dilution problems.650's are good for about 380bhp 90% 45psi. So you have to ask yourself how much power do you want to make, because if its 250bhp then a 440cc would be more fitting and would make tuning the rest of the tables away from WOT easier to achieve.(I am not a tuner or mapper etc so take my view for what it is... a half knowing fumbler)This injector size calculator has been helpful in many of my side quests:- https://fuelinjectorclinic.com/hp-calculator
Quote from: jvanzyl on December 2, 2022, 23:02Could you elaborate? Is that Paul at TCB and is FIC the brand?
Quote from: shnazzle on December 6, 2022, 21:14I always still stick by the fact that the 239hp Helen's made was on 440cc injectors and they were barely tickled. Calculations also work out well for 440cc.The next thing to think is; are you installing a RRFPR with fuel return or not? Sometimes people (wrongly) use bigger injectors to compensate for the "reduced" fuel pressure at boost. Anyway, 630cc is massively overkill.Sent from my ONEPLUS A5000 using Tapatalk
Quote from: shnazzle on December 6, 2022, 21:33I'm hardly a knowledgeable authority on the matter.All I've got to go off is what I experienced on one mr2 and seen in the community (here and otherwise) 440cc just makes sense also because they don't max out until like 280-300hp, which you're unlikely to want to run on an unbuilt 1zz anyway,and on a stock gearbox.630cc works fine. I'd love to see if you ever see more than 60% duty cycle haha. So, good for longevity of the injectors?
Quote from: Call the midlife! on December 6, 2022, 21:50Well as previously discussed I started the build with a view to building in redundancies, future proofing for what I thought might end up as a built engine in the future.A year on and most of the turbo parts are back in boxes, waiting to be tried again next year 😂
Quote from: threepot on December 7, 2022, 12:08This is why I would be more tempted to go for a second hand OEM injector, than end up in the current day pea soup of chinese clone injectors. Every dick and his dog are reselling Alibaba car parts nowadays... Febi, Blueprint, Firstline, Britpart, Lucas, Delphi etc then all the small businesses too. Just repacking things into their own brand packaging, laser etching their own part number and brand onto China stuff. I am in the middle of that OEM car parts distribution world.I'd be just guessing, but think about this... 4 "Genuine" OEM injectors, made in a proper ISO factory for £148.04 including VAT (£24.67), and the ebay fee's (£12.22) and the postage (£4.50?) = £106.65 and there has to be a profit margin for KSM in there - 20% ?..... can you really buy a brand new Denso injector for £21.33 each even at wholesale? And shipping from supplier, import tax etc.Or are they just these - https://www.aliexpress.com/item/1005004459284987.html
Quote from: threepot on December 7, 2022, 15:55Bosch 430cc I think....https://www.ebay.co.uk/itm/325335270810Or Green Giants = https://www.ebay.co.uk/itm/393130274156(looks like we are posting similar thoughts!)
Quote from: Call the midlife! on December 7, 2022, 16:01Might even have been 470 that I looked at, the listing I bought them off on ebay has long since ended and I never went through with the purchase in the end so can't say for certain.