720cc secondaries
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720cc secondaries
I can get my hands on 2 greddy 720cc secondaries...to put in place of my 550cc stockers....how much HP will theses 720cc handle?? or should i just spend money and get the 1600cc secondaries
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Question's been asked a lot, but off the top of my head I'd say 300whp would be the absolute max... Like dangerously maxed out, lol. I've seen a dyno-sheet recently posted and the guy dyno'd at like 304whp with 720cc's... It's not recommended to stretch any injector that far though. Maybe 270-280whp is a good maximum number.
The 1600's would be around the same price, but there might be a little injector/fuel-rail modification necessary. I think FC3Spro.com has some reading on this, but I'm not *quite* sure.
Try searching.
The 1600's would be around the same price, but there might be a little injector/fuel-rail modification necessary. I think FC3Spro.com has some reading on this, but I'm not *quite* sure.
Try searching.
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thats what im goin with a rtec 1.7 and 720 secondaries....i could always put my 720s to primary too.....would that allow me to obtain a higher HP?? and of course tune it with my SAFC
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Originally Posted by eriksseven
The 1600's would be around the same price, but there might be a little injector/fuel-rail modification necessary. I think FC3Spro.com has some reading on this, but I'm not *quite* sure.
Try searching.
Try searching.
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Originally Posted by patman
really simple. take the HP you want, and multiply by 7.65. that is the sum of your injector flowrates in cc/min.
so if you want 500 BHP, you need 3825 total cc/min. if you keep stock primaries, then thats 3825-1100=2700cc/min for secondaries = 1350cc each.
7.65 is based on a BSFC of .6 and 80% duty cycle. this is a fairly standard conservative number for highly modded 13B.
i personally run stock 550 primaries and 1260 secondaries, with my af61r at 17psi.
pat
so if you want 500 BHP, you need 3825 total cc/min. if you keep stock primaries, then thats 3825-1100=2700cc/min for secondaries = 1350cc each.
7.65 is based on a BSFC of .6 and 80% duty cycle. this is a fairly standard conservative number for highly modded 13B.
i personally run stock 550 primaries and 1260 secondaries, with my af61r at 17psi.
pat
Using that equation but substituting .7 instead of .6 because it's a turbo and you want it to be a little richer, with the 550 primaries and 720 secondaries you should be good for about 265 to the rear wheels. That's being safe. I'm sure you could really push it if you wanted to upto like 300 but like was said above that's probably not safe and might not last too long.
Dom
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Originally Posted by lilskyline240
Whats the largest injector i can get without having to modify my fuel rail
Originally Posted by lilskyline240
....all i have to tune it is a SAFC.....
Now, you dont need a stand alone to put in 1600's. Greddy has a great piggyback computer. It will handle any size you throw at it.
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would running 4 x 720 give me enough fuel to get to 350hp?? i would first only run 720 secondaries...but in the future get some 720 primaries....would that be enough fuel for my goal???
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350 hp on what turbo?? stock?? NO, you will not get this amount of power if your planning to use your stock turbo no matter how big injectors you put into your motor.
I would stop thinking about fuel injector size and plan your setup first with the right turbo for the right injector size, and most importantly fuel management.
Why spend money on bigger injectors if you could just run your stock turbo at 11-13 psi. with good tuning (SAFC you already have). You gonna have hard time tuning injector setting and the results will not show anything. Forget a greddy piggyback. For the money you'll spend on safc, injectors, greddy piggyback, rtek, etc. you could just get a standalone. In the meantime I would suggest running an aftermarket fuel pump perhaps a 255 walbro (cheap and easy to put in).
My theory is go big or go home. If you want 350hp, it might cost you some bucks so I would suggest you do it reliably right the first time. By the way, you can run 1600cc injectors without modify stock fuel rail.......all you would have to do is just simply modify the actual injector which is very easy.
87 GXL
91 j-spec TII motor
TII tranny
TII rear
Racing beat downpipe
Racing beat pulleys
Apex n1 dual exhaust
Greddy 24v front mount intercooler
HKS mega flow intake (custom made with honda prelude CAI)
HKS super sequential BOV
10 mm magnecore wires
Boostvalve.com ball/spring boost controller
Racing Hart C2 3 piece 17 inch wheels
TII side view mirrors
TII round tailights
Microtech ltx-8 (not yet installed)
I would stop thinking about fuel injector size and plan your setup first with the right turbo for the right injector size, and most importantly fuel management.
Why spend money on bigger injectors if you could just run your stock turbo at 11-13 psi. with good tuning (SAFC you already have). You gonna have hard time tuning injector setting and the results will not show anything. Forget a greddy piggyback. For the money you'll spend on safc, injectors, greddy piggyback, rtek, etc. you could just get a standalone. In the meantime I would suggest running an aftermarket fuel pump perhaps a 255 walbro (cheap and easy to put in).
My theory is go big or go home. If you want 350hp, it might cost you some bucks so I would suggest you do it reliably right the first time. By the way, you can run 1600cc injectors without modify stock fuel rail.......all you would have to do is just simply modify the actual injector which is very easy.
87 GXL
91 j-spec TII motor
TII tranny
TII rear
Racing beat downpipe
Racing beat pulleys
Apex n1 dual exhaust
Greddy 24v front mount intercooler
HKS mega flow intake (custom made with honda prelude CAI)
HKS super sequential BOV
10 mm magnecore wires
Boostvalve.com ball/spring boost controller
Racing Hart C2 3 piece 17 inch wheels
TII side view mirrors
TII round tailights
Microtech ltx-8 (not yet installed)
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i know im not makin that power on a stock turbo....im not stupid.....BNR stage 2 is whats in the mail....im just wondering if 4 x 720 will work for 350hp
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Use that equation I posted earlier. . seriously It's easy. 720x4 divided by 7.7 The answer will be home much bhp that setup can handle at about 80duty cycle of the injectors.
Dom
Dom
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anyone know of any other 720 injectors other than the greddy ones that are cheap too....or anyone selling some?? all i need are 2 right now...but if u have 4 ill take em
#21
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Try looking around at google or some tuner magazines for injectors. I think that Greddy doesnt actually make the injectors they just restamp their name on them.
I'm sorry a can't be much more help but I'm in the market for 4 720cc injectors too.
good luck,
TR
I'm sorry a can't be much more help but I'm in the market for 4 720cc injectors too.
good luck,
TR
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