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 Post subject: injectors
Posted: Tue Feb 28, 2006 12:28 pm 
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does anyone know anything about the bosch yellow tops, magna "spec" injectors, im told at 48 psi they flow 24lb. how much power will these support. and what flow is 24lb im only use to 550cc injectors etc what would there cc be rated at.

thanks mr xr8
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Posted: Tue Feb 28, 2006 12:52 pm 
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24lb are 252cc/min I believe.

I'm also told that magna injectors will flow 21lb @ ford fuel pressure.

 

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Posted: Tue Feb 28, 2006 1:45 pm 
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hmm i dont think these injectors are going to big enough. i think i will need about 600cc injectors i was told. what size would they be?
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Posted: Tue Feb 28, 2006 2:01 pm 
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Errr.... i think 52lb are 550cc so you're working upwards from there.

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Posted: Tue Feb 28, 2006 4:41 pm 
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600cc!!! I assume you intend on running a high boost setup, at that sort of power level you don't bother at looking for factory type injectors, you will need brand new performance injectors along with a full aftermarket engine management system capable of running them.

FYI Magna yellow tops are below 19lb (can't remember the specs), while the Magna bluetops are 21lb (215cc) @ 38psi or 24lb (245cc) @ 48psi. And yes 600cc is around 58lb, capable of 900+hp on a V8.
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Posted: Tue Feb 28, 2006 4:56 pm 
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ywh im getting a e11v2 i might be able to get 500cc injectors if thats the case.
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Posted: Tue Feb 28, 2006 5:04 pm 
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Target power should dictate injector choice as opposed to ECU type...

How much power are you chasing?

 

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Posted: Tue Feb 28, 2006 5:06 pm 
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mr_xr8 wrote:
ywh im getting a e11v2 i might be able to get 500cc injectors if thats the case.


500cc injectors are good for 100hp each, ideally you want to run the smallest injector possible (for a street engine anyway), but you also want to be safe in the top end, preferably not running over the 80%DC.
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Posted: Tue Feb 28, 2006 5:18 pm 
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well hit man sad it sounded like a 500-600hp set up
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Posted: Mon Mar 06, 2006 12:28 am 
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What ever Matt says will be spot on...
Any injector from 42 Lb to 80Lb..
Over 50Lb you'll have to use low impedance injectors...
With that ecu you'll be fine..Just make sure fuel delivery is up to task.. Atleast 255 intank pump...
36Lb can push 280 rwkw @ 45 Lb fuel pressure....
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Posted: Mon Mar 06, 2006 9:30 am 
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i will use a rising rate fuel pressure reg. but for fuel to the engine, the engine builder recomended instead of pulling out the custom boot install to get to the fuel tank to modify it have the stock pump, pump into a surge tank then have a bosch 044 pump to the injectors then back into the surge tank. im not sure but would the be a chance of surge?
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Posted: Thu Mar 09, 2006 11:11 pm 
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you only really get surge or fuel starvation on big launches or hard cornering with a small amount of fuel in a stock tank. I would play around with surge tanks later on, if and when you need them.
A good old Walbro pump is good for 300plus wkws, in the tank, all stock
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Posted: Fri Mar 10, 2006 9:27 am 
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I'm running stock pump and Bosch 984 pump in-line - was going to look at Walbro 255...but was told they weren't up to the task when it came to output at 3 or 4 bar (from memory).

Bosch 044 will do the job for sure - just be weary...they are loud !

 

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Posted: Tue Mar 14, 2006 10:39 am 
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its not really a surge tank, because we cant get to the origanal tank for a return line (custom boot install) we have a surge type tank with a return in it. its like having another mini fuel tank.
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Posted: Tue Mar 14, 2006 10:46 am 
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im wanting 240rwkw what injectors should i use? 36 lb?

 

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