383 injectors
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Joined: Nov 2007
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From: O`TOWN
Re: 383 injectors
with out knowing all the specs for the cam and heads its a guessing game at best. but more than likely a 30 will do fine. it will be a pig till you throw the boost to it so don't be surprised.
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Joined: Jul 2007
Posts: 353
From: Pittsburgh
Re: 383 injectors
Definately need to know more data on heads and cam size to be able to get an idea what it will produce.
I'm not sure I agree it will be a pig tho
I've seen a mild 226 deg cammed 8.8 to 1 comp 406 designed for a blower make 520 hp at the crank with good AFR heads. I thought that was pretty darn incredible for such a low comp tiny cam for a 406 motor.
You can still make power with low comp.
That being said, I dont think 450 crank/flexplate hp will be a problem with a modest cam and good flowing heads/intake. Something like that at a base 43.5 psi pressure I'd go with a 30-36 lb injector and cycle dutys will be in range. 42's are good for 500-550whp depending on the combo. My buddy's motor has seen 520whp and over 85% duty on his 42's. So those would be abit overkill for you. 24's i've seen max out around 355-365whp which could be in your range but a 30 should give you room. No way I would try stock injectors but thats just a guess on your combo
Heres the kicker tho.... why are you worried about buying n/a injectors now and then gettin bigger injectors? Just buy the big injectors now. Get the siemens 80lbs they are good to 800-900whp depending on the pressure and fuel pumps you use. They idle down at low pulsewidths just fine. i use them on my baby 401 and now again on my huge heads/cam 401. If you have half decent heads/cam and decent sized twins or decent sized blower, it will be a 600whp car with 10-12 psi and near 800 on 17-18. 80's will cover that easily and is a good setup for twin walbro intank pumps
With proper tuning they will work. High impedence they will work great. I should be going to FIC 115's here soon and expect no issues with idle or low speed operation with such large injector.
I'm not sure I agree it will be a pig tho
I've seen a mild 226 deg cammed 8.8 to 1 comp 406 designed for a blower make 520 hp at the crank with good AFR heads. I thought that was pretty darn incredible for such a low comp tiny cam for a 406 motor. You can still make power with low comp.
That being said, I dont think 450 crank/flexplate hp will be a problem with a modest cam and good flowing heads/intake. Something like that at a base 43.5 psi pressure I'd go with a 30-36 lb injector and cycle dutys will be in range. 42's are good for 500-550whp depending on the combo. My buddy's motor has seen 520whp and over 85% duty on his 42's. So those would be abit overkill for you. 24's i've seen max out around 355-365whp which could be in your range but a 30 should give you room. No way I would try stock injectors but thats just a guess on your combo
Heres the kicker tho.... why are you worried about buying n/a injectors now and then gettin bigger injectors? Just buy the big injectors now. Get the siemens 80lbs they are good to 800-900whp depending on the pressure and fuel pumps you use. They idle down at low pulsewidths just fine. i use them on my baby 401 and now again on my huge heads/cam 401.
If you have half decent heads/cam and decent sized twins or decent sized blower, it will be a 600whp car with 10-12 psi and near 800 on 17-18. 80's will cover that easily and is a good setup for twin walbro intank pumpsWith proper tuning they will work. High impedence they will work great. I should be going to FIC 115's here soon and expect no issues with idle or low speed operation with such large injector.
Last edited by Orr89rocz; Jul 20, 2012 at 03:34 PM.
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