toyo rob Posted October 25, 2006 Share Posted October 25, 2006 Could someone please tell me whether there is any point to me upgrading my injectors from the standard j spec ones to a set of high impedance ones, say from Power Enterprise. i must be full bpu, walbro pump, CW SMIC, etc etc, listed below mostly. was just wondering whether a injector upgrade would give be better economy or performance. (i did talk to a mech about injectors ages ago and seem to remember a bit about bigger injectors 'moved' faster and so had more control but then i could be talking C*** as usual!!!) cheers Rob S Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 25, 2006 Share Posted October 25, 2006 Bigger injectors will allow more fuel flow at high boost. The stock J-spec 440 injectors run out of flow at roughly 1.2 bar. (Less, if they're old a slightly worn/blocked). As such, you may find your AFR's at full throttle start to run lean. Especially on a high speed run. Adding bigger injectors won't actually give you any more power by themselves, but they will allow you to make better and most importantly, safer, use of high boost settings. (Bear in mind that you don't really gain much more power, if any, above 1.2 bar on the stock turbos). If you plan on upgrading from the stock twins, then injectors are almost a certain requirement. If you do want to change injectors, you'll also need some way of controlling them. Apexi S-AFC as a minimum. They certainly won't help economy Unless your old ones are really shagged! Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 25, 2006 Share Posted October 25, 2006 Matt - are 550's the best next upgrade mate? Obviously with current problems this will be looked at a while down the line! I'm running full BPU with new Envy Hybrid Stage 3's and have experienced running lean once or twice, but at below 4k rpm which I think is OK for closed (...or is it open at this point) loop system? I take it this is a worthy upgrade then for hybrids or above. Cheers Greg. Quote Link to comment Share on other sites More sharing options...
Nic Posted October 25, 2006 Share Posted October 25, 2006 My OEM 440cc injectors were running 90+ duty cycles at 1.2bar so were on the edge of their performance. I now have 550cc injectors and emanage controlling them. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 25, 2006 Share Posted October 25, 2006 I take it this is a worthy upgrade then for hybrids or above. Yep, that would be the next step. Which size, type, will depend on your long term goals. But depending on what you're intending to use as a fuel controller can have a bearing on which injectors you should choose. Personally, if you're looking at any kind of piggy pack system, get the injectors sized adaquatly for your uses, but don't over size for the sake of it. ie. don't get 1000cc injectors if you're running hybrids or a small single, and are planning on using an E-manage. IMHO, 550's are fine for hybrids, and 650's are OK for T61, T67 etc. (650's for a T67 on very high boost is pushing it though). Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 25, 2006 Share Posted October 25, 2006 Thanks Matt. Will look to upgrade sometime in Jan probably. Any ideas on fuel management prices? SAF2 the cheapest and best bang for buck? Greg Quote Link to comment Share on other sites More sharing options...
Kranz Posted October 25, 2006 Share Posted October 25, 2006 SAFC2 can control up to 720 or 750cc injectors and can be had for around 100 notes. Next step up in terms of controllability & price is the Emanage blue, then the Emanage Ultimate is a step up from that. Prices I don't know, but around £300 for blue rings a bell? Quote Link to comment Share on other sites More sharing options...
Sheefa Posted October 25, 2006 Share Posted October 25, 2006 Thanks buddy. Yeah seen a few Ultimates for around the £450 mark. Just want the standard control system if I decide to upgrade. Wouldn't be running any more than 500rwhp. Quote Link to comment Share on other sites More sharing options...
Prof. Monkey Posted October 25, 2006 Share Posted October 25, 2006 SAFC2 can control up to 720 or 750cc injectors and can be had for around 100 notes. I have been led to beleive that the SAFC can only handle 10% oversized injectors or have I been mis-informed? Do I not need to get rid of my Apexi then, I am running 620's Quote Link to comment Share on other sites More sharing options...
supra matt Posted October 25, 2006 Share Posted October 25, 2006 as far as im aware safc will only handle 555 at most . Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 25, 2006 Share Posted October 25, 2006 Well, Leon and Dude used to run an old S-AFC with 850's! The AFC and E-manage both reduce airflow voltage by 50%, so there's no difference in the size of injectors they can control. However, the difference between an AFC and an E-manage is the adjustment points. An early AFC has 8x2 IIRC, the S-AFC2 has 12x2 whereas the E-manage has 16x16. On top of that, the E-manage, (when combined with their pressure sensor), can also increase injector duty where the stock MAP sensor runs out. It can also adjust ignition timing, (Although I've not seen it work on a UK spec yet). Quote Link to comment Share on other sites More sharing options...
toyo rob Posted October 30, 2006 Author Share Posted October 30, 2006 Since i've got blitz sbc already could i not use the afr analyser from blitz, which connects up to the sbc, to control them or will they read the afr only not control the injectors. Rob Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 30, 2006 Share Posted October 30, 2006 Since i've got blitz sbc already could i not use the afr analyser from blitz, which connects up to the sbc, to control them or will they read the afr only not control the injectors. Rob No. At best, that'll only be reading a narroband signal to monitor AFR. It doesn't have the ability to control fuel. Quote Link to comment Share on other sites More sharing options...
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