Nozzle size

[SAMzG35]

Hi!
Long time lurker, first time posting. I bought a brand new HFS-6 over 6 years ago and never installed it. My build took a different direction lately and I think its time to put this kit to use.

I'm kinda lost on the nozzle size and location. Before I drill and start making holes I wanna make sure I got this right.

A little bit about my car, 2004 G35 coupe twin turbo with Brian Crower 4.2L Stroker.
I have ID2000 injectors and I'm planning to run 20-24psi.
Piping goes as follow Turbo>Intercooler>BOV>MAF>Throttle body.


Can someone please let me know if I got this correctly if I'm planning to run a 50:50 meth/water with 15% to fuel?
2000cc x 6=12000
12000 x 0.15=1800cc
160psi - 20~24=140~136psi.
The manual shows the 1.00mm flows at 550cc at 140psi

Now this is the part where I'm confused.
If I got the above numbers correct, does that mean I need 3x1.00mm nozzles at a total of 1650cc (closest i can get to 1800cc)?

If I do need 3, where do they go? After the MAF before Throttle body?

Much appreciated.

[dlheman]

Assuming that you will use 100% duty cycle of your fuel injectors, yes your calculations are correct. But maybe allow 10% to 15% loss of pressure (I don't see this in HFS6 manual, but is explained in HFS3/4 manual).

So if we average the loss of pressure between 10% to 15%, we get an average pressure loss of 12.5%. So that means, 136psi x .875 = 119psi. Or let's just say 120psi.

The simplest setup would be to have jets right on the intercooler outlet. I would steer away from installing jet on the throttle body as it is too close to be well distributed across all cylinders.

But being a twin turbo setup likes yours (and looks like it is going to make a massive amount of power), maybe you want to try individual port W/M injection? Say for example, 1 per cylinders, and 1 at intercooler exit for total of 7 jets.

I don't know if your VQ35 engine is dual throttle bodies or single throttle body version. If dual throttle bodies, you can add 1 jet each on the intercooler outlet pipe leading to the throttle bodies - which means 8 jets in total, along with the individual jets per cylinders of 6.

And yeah, you want to place it after the MAF. Unless you want to add a jet pre turbo.

And once you have decided on how many jets you want to use, do a 60 seconds SYS test spray into a water containers to make sure each jet delivers the correct amount.

[SAMzG35]

I have a VQ35DE which is single throttle body. The idea of individual ports is nice but sounds like a pain lol.
Lets say if decided to go ahead with individual port. Would this setup work?
If I decided to up my injection to 20% which would make a total 2400cc needs to be injected.
a 0.7mm flows at 350cc at 120psi.
So if I install 6 x 0.7mm into each cylinder I'm at 2100cc. Then I will install another 0.7mm onto the intercooler outlet. Total of 2450cc.
Does this sound about right?

[dlheman]

Yes that would be right.

The Aquamist distribution block allows for 6+1 distribution. Exactly the stuff you need.

[SAMzG35]

Thanks
One more questions
The flow chart in the HFS6 manual does not match the flow chart on the website and in the newer manuals (HFS3/4). Total of three different versions.

The one in the HFS6 manual says at 120psi a 0.7mm jet flows at approximately 355~360cc
The one in the HFS3/4 manual says at 120psi a 0.7mm jet flows at approximately 245-250cc
The one on the website says at 120psi a 0.7mm jet flows at approximately 310~315cc

Which one would be correct?

[dlheman]

Actually you will need bigger jets than what the table says.

This is because you are running 7 jets, and at least 6 of them will requires the use kf checkvalve. Each check valve needs 1bar of pressure to crack open, which means a further loss of pressure. You may want to get the 3000cc/min pump for this.

Actually, check out the recent post by RICE RACING in this forum in another section, which shows RB26DETT with 6+1 setup. I am sure he can help you.

[dlheman]

Originally Posted by SAMzG35

Thanks
One more questions
The flow chart in the HFS6 manual does not match the flow chart on the website and in the newer manuals (HFS3/4). Total of three different versions.

The one in the HFS6 manual says at 120psi a 0.7mm jet flows at approximately 355~360cc
The one in the HFS3/4 manual says at 120psi a 0.7mm jet flows at approximately 245-250cc
The one on the website says at 120psi a 0.7mm jet flows at approximately 310~315cc

Which one would be correct?

The flow table / chart is just a guideline, but i found it to be accurate enough on my HFS3 and HFS4. Maybe there is a change between HFS6 and HFS3/4. The best way to do this is to do an actual 60 seconds spray of the selected jet using the SYS jumper.

And remember, the more jets used the more loss of pressure = the lesser each jet will flow out.

[dlheman]

http://www.aquamist.co.uk/forum2/vbu...?t=1924&page=2

[SAMzG35]

I'll check that thread. I think doing all this plumbing might be too much work for me with the time frame I'm working with. I might end up with 2 x 1.2+mm jets (750cc each) on the intercooler outlet and see how that plays out.

[dlheman]

And please disregard what I said about placing the jet pre turbo.

What I meant was, place the jet after the MAF if you want pre turbo. I don’t know ifbthe MAF will be happy if it is exposed to WM. I don’t think it will as they are sensitive bunch.