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Old 02-09-2013, 03:43 AM   #1
Mosting3
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Default Aquamist nozzle size?

Hello Richard,

Am buying HFS-3 , but before doing so, i would like to know what nozzle size to use;

I have :
EJ207 V.7 STI,
1000 cc injectors
50/50 WM.
stock fpr
power band 375-400 WHP.
APS TMIC


What injector size come with the system? is it better to use dual nozzle or single? and what injector size do i need?

Thanks for your advanced help.
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Old 02-09-2013, 01:04 PM   #2
carnz-pj-410
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If you go on the Howerton Engineering site, they have a page for Nozzle size calculation, it's a pretty simple formula and includes a chart to help with sizing.
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Old 02-09-2013, 02:56 PM   #3
Mosting3
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Thanks, i have looked on the Howerton website, and from my calculation it seems i need 2x0.9 jets, but maybe 1x0.8 and 1x0.9 will work fine.

but my question, the fuel injectors that i have are 1000 cc, and the max i reached of IDC is 60-70%. will this change the formula?

I put 30 PSI as peak while i think the max i will reach is 26 PSI/

Thanks again.
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Old 02-11-2013, 04:15 PM   #4
Aquamist
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Here is a simple chart to calculate your jet requirement:



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Old 02-11-2013, 05:31 PM   #5
Mosting3
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Richard, can you help me with my post #3? am i right? or am i missing something?

Thanks a lot.
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Old 02-11-2013, 05:36 PM   #6
Aquamist
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If you match the full flow capacity of fuel injector to the full flow capacity of the water jets, duty cycle % does not matter.
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Old 01-06-2014, 12:18 PM   #7
streetking
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I still can't seem to wrap my head around how to determine the nozzle size. I am on stock turbo and am boosting 20psi. I have DW 850cc injectors which flows 877cc average and am plan on runing 50/50 alcohol/water. What nozzle and restrictor should I pick? How to read that chart? I am just so dumb....
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Old 01-08-2014, 03:01 AM   #8
Aquamist
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OK

1. Total fuel flow = 3508cc/min
2. M50:W50 flow = 3508 x 17.5% = 613.9cc/min

Your jets: 0.8+0.9 = 700cc/min @140psi (with a little bit of head room). The 0.7mm restrictor is ideal.
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Old 01-08-2014, 09:21 PM   #9
streetking
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Aren't I supposed to use the nearest larger restrictor to regulate flow? Isn't the .7 smaller than the .8 and .9 combined? Wouldn't the .9mm restrictor be a better choice? Sorry I am a total noob on this.

My peak IDC would only be around 70% or so...

Last edited by streetking; 01-08-2014 at 10:40 PM.
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Old 01-09-2014, 11:41 AM   #10
Aquamist
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my fault, I meant 0.9mm.
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