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View Poll Results: Which Aquamist kit should I put on my 2007 STi?
HFS-1 2 28.57%
HFS-5 5 71.43%
Voters: 7. You may not vote on this poll

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Old 02-16-2008, 07:39 PM   #1
rhinotech
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Default Aquamist HFS-1 or HFS-5. Help me decide for my 07 STi!

Vote and post a small description why.

I'm stuck between which one of these kits to buy. There are quite a few people that I've talked to that recommend the HFS-1 kit on an STi over the HFS-5. Mostly because of the price vs. features that you can take advantage of I guess.

I would love to have the HFS-5 kit but want to know if its worth the extra money and if there is really THAT big of a difference. I would like to use the money I could save elsewhere. I've searched and asked many people their opinions but can't seem to get an answer from someone that can make it clear to me why to pick the HFS-1 over the HFS-5...

A little help would be super appreciated.

Thanks in advance!
Ryan
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Old 02-16-2008, 07:49 PM   #2
rhinotech
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So right now I've voted for HFS-5 because it has all of the "goodies" and the accumulator. It's going to be interesting to see peoples opinions (reputable tuners) if the HFS-5 is super superior over the HFS-1.
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Old 02-16-2008, 08:08 PM   #3
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PM DYNO FLASH or IMPORTEDCARS of ICS. they install both kits on almost every car they come across. they can help you out with your question.
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Old 02-16-2008, 08:12 PM   #4
rhinotech
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Thank you BuggeyEYED
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Old 02-17-2008, 02:29 AM   #5
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No explanations or comments?
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Old 02-17-2008, 02:50 AM   #6
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Old 02-17-2008, 03:41 AM   #7
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fia2...
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Old 02-17-2008, 07:59 PM   #8
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I might purchase the HFS-1 and upgrade to the HFS-5 later.

Hm, I must have missed the part where the HFS-1 doesn't come with FIA2..

I'm still deciding
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Old 02-18-2008, 12:10 PM   #9
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bump.
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Old 02-18-2008, 12:34 PM   #10
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Quote:
Originally Posted by BuggeyEYED View Post
PM DYNO FLASH or IMPORTEDCARS of ICS. they install both kits on almost every car they come across. they can help you out with your question.
Al recommended an hfs 1 to me, which is probably what I will end up with.

What does the surge arrestor/ accumulator of the hfs5 do?
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Old 02-18-2008, 02:44 PM   #11
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the pumping action of the pump creates little pulses. The accumulator takes this up so that the flow is like this ------- instead of like this ^^^^^^.

This may help better then me writing something more
http://en.wikipedia.org/wiki/Water_hammer
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Old 02-18-2008, 02:53 PM   #12
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The FiA2 is an interface to the fuel injector circuitry. The FiA2 mirrors the FIDC to the Aquamist HSV. The HSV can be looked like at like the electrical part of a fuel injector, the jets could be looked as the injector orifice. With the HSV and the FiA2, the PCM could be looked like its effectively the W/A controller and the user gets a very linear injection.....no knobs and such to play with.....W/A tuning becomes more of jet selection, mix ratio, and the trigger/turn on point.
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Old 02-18-2008, 04:28 PM   #13
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There is one more job the accumulator does other than smooth out the pressure ripple.

It stores a small amount of pressurised during the "pump off" period. You get an instant pressurised water at the next injection event. This also negates the necessity of running the pump full time to maintain line pressure.
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Old 02-19-2008, 12:46 AM   #14
rhinotech
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Quote:
Originally Posted by Aquamist View Post
There is one more job the accumulator does other than smooth out the pressure ripple.

It stores a small amount of pressurised during the "pump off" period. You get an instant pressurised water at the next injection event. This also negates the necessity of running the pump full time to maintain line pressure.
Quote:
Originally Posted by aqmist View Post
The FiA2 is an interface to the fuel injector circuitry. The FiA2 mirrors the FIDC to the Aquamist HSV. The HSV can be looked like at like the electrical part of a fuel injector, the jets could be looked as the injector orifice. With the HSV and the FiA2, the PCM could be looked like its effectively the W/A controller and the user gets a very linear injection.....no knobs and such to play with.....W/A tuning becomes more of jet selection, mix ratio, and the trigger/turn on point.
Quote:
Originally Posted by aqmist View Post
the pumping action of the pump creates little pulses. The accumulator takes this up so that the flow is like this ------- instead of like this ^^^^^^.

This may help better then me writing something more
http://en.wikipedia.org/wiki/Water_hammer
Really good information guys! Thank you very much for chiming in!

Ryan
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Old 02-27-2008, 11:46 PM   #15
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Welp, just ordered my HFS-5!!!
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