Injector help (searched)
12-12-10, 11:25 AM
#1
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Injector help (searched)
Grr im building a 320+ hp rotary , goin for a clean street ... ive serched my *** off looking for what is a good injector setup for this hp ? all the info i can find is people running like 1600/2000 for there drift car and 500 hp ... what would yall recommend for around 350hp ? Thanks guys
12-12-10, 11:30 AM
#2
depends on your ECU choice and end goals. when fuel is concerned it is usually best to go bigger than necessary to give you some breathing room.
anyways, 4 720's will get you to the figure you asked about, but that is a bare minimum figure for the injector sizing not including fuel pump and fuel pressure.
anyways, 4 720's will get you to the figure you asked about, but that is a bare minimum figure for the injector sizing not including fuel pump and fuel pressure.
12-12-10, 11:33 AM
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Karack u always seem to help me out so fast haha you da man! im planning on goin with the rtek 2.1. so 550 primary and 720 secondary. is that enough fuel for 350 hp ? i have a walbro255 so would u suggest 720 / 720 ? or maybe even bigger seconds? idk lol im new to these rotarys can ya tell ? =]
12-12-10, 11:44 AM
#4
550/720 is good for about 300whp, 4X720 is good for about 350-370. those are high end estimates, basically maxing out the injectors as much as they can push with a good fuel pump and slightly higher than stock fuel pressure(~40psi static at idle)
Last edited by RotaryEvolution; 12-12-10 at 11:46 AM.
12-12-10, 11:50 AM
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ok cool good to know! Thanks alot man , ill do atleast 4x 720. maybe even bigger secondarys if u say thats almost maxing them out because i should be pushing right up in the 350 mark. thanks alot man! u know much about ignition setups for these? i was thinkin MSD 6A but i hear msd dont sell a certain kit for FC's u have to piece it together?
12-12-10, 11:54 AM
#6
you may be able to go larger on the secondaries than 720 but you will have to play with the Rtek a bit to find out it's limitations. it was designed to run 550/550 550/720 and 720/720 so i usually say that the ECU is limited to right around 350WHP for its tuning capability. you may be able to squeeze a little more out of it by upping the secondaries to 850's(if you can find some, its an uncommon size for top feed injectors) and some tweaking of the maps. you will be hard pressed to get more than 370ish out of it, at least until they can ditch the AFM anyways.
12-12-10, 11:58 AM
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oh wow ok im glad u put it that way , maybe ill just keep it chill and run 720/720 , im not looking for monsterous anyway jus want over 300hp for a quick fun street car. Thanks alot Karack your always the dude with the awnsers !
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12-12-10, 12:22 PM
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One more thing , what brand would u suggest ? i see greddy 720 x 4 is $600. i wouldnt mind payin that but if there is a good injector for cheaper id deff like to know lol anyone let me know please and thank you
12-12-10, 12:44 PM
#10
RC engineering or if you can find the denso 680's they are the same as the 720's that greddy lists since the SE 1st gens used lower fuel pressure than the FC does they flow more than the rated 680cc's.
i would stay away from the ebay crap like venom brand injectors(called TLF performance now), though they work they aren't very accurate from injector to injector. i've also noticed PW degradation from them over time where i had tuned a car and less than a year later it was running almost 2 full points leaner! also tried a TLF pump and although it flows great! it stalls and pumps air from time to time on hot days, pump runs but 0 fuel pressure until it cools.. you get what you pay for.
i would stay away from the ebay crap like venom brand injectors(called TLF performance now), though they work they aren't very accurate from injector to injector. i've also noticed PW degradation from them over time where i had tuned a car and less than a year later it was running almost 2 full points leaner! also tried a TLF pump and although it flows great! it stalls and pumps air from time to time on hot days, pump runs but 0 fuel pressure until it cools.. you get what you pay for.
Last edited by RotaryEvolution; 12-12-10 at 12:52 PM.
12-12-10, 12:53 PM
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Ya i hear ya , im doing a completly reliable build all name brand good quality. rebuild my TurboII 3k miles ago new clutch 3k ago , low milage tranny i bought form japan2la goin in next weekend , (new clutch was pointless i have a heavy duty act street clutch rated for 380 ft lbs torque on its way) but so i have a solid ground for my build. and thank you very much i will do research on them.
BTW - i was lookin at that dude dyno post about how much hp everyone thinks he will build , i love how everyone was all posting numbers then u get in there and own everyone with the boost creep theory and now everyone is all talkin like they new that would happen be4 u mentions it hahaha
BTW - i was lookin at that dude dyno post about how much hp everyone thinks he will build , i love how everyone was all posting numbers then u get in there and own everyone with the boost creep theory and now everyone is all talkin like they new that would happen be4 u mentions it hahaha
12-12-10, 01:05 PM
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makes sence , i gotta go find out what year my car is lol , tage on car says 03/86 ... title says 87.. yet vins match haha but someone showed me i can tell by the last letter on my VIN so ima go check that real quick then ill know once and for all lmao
12-12-10, 02:21 PM
#15
many manufacturers build cars in mass production prior to the year they list them and then start putting them on the showroom floor mid year as cars from the future marketed as the coming year's model.
i never really understood how or why they did this, it's false advertising to me since it is like selling a car that was never made yet.
i never really understood how or why they did this, it's false advertising to me since it is like selling a car that was never made yet.
12-12-10, 03:51 PM
#17
Because car buyers are easily impressed with buying next year's model! Cars from the future are awesome.
Anyway, I'm in the middle of building a hybrid turbo with expected horsepower in the 300-330 whp range, and I'll be using a 720/890cc injector setup. 4x 720 is a little too borderline for me, although tuning it would be extremely easy with the Rtek presets.
Anyway, I'm in the middle of building a hybrid turbo with expected horsepower in the 300-330 whp range, and I'll be using a 720/890cc injector setup. 4x 720 is a little too borderline for me, although tuning it would be extremely easy with the Rtek presets.
12-13-10, 02:55 AM
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I am liking this thread very informative. I'm leaning towards the same build my self , with a rtek 2.1 n 720s all around hoping to get up to the 300 hp benchmark. I really hope u can hit the hp u want.
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