Jim Green's 90q 20vt - 636whp 07k

[Hank]

AWIC isn't exactly weightless. I'd wager that they are usually heavier systems and still in front of the axles. That said, I think my URQ will get an AWIC with the exchanger in the spoiler ala group B.

[Mcstiff]

AWIC isn't exactly weightless. I'd wager that they are usually heavier systems and still in front of the axles. That said, I think my URQ will get an AWIC with the exchanger in the spoiler ala group B.

Nothing is weightless; at least you can put your heat exchangers behind the axle.

[audifreakjim]

OK, My brain is in work mode right now, can someone plot out for me how pre-compressor injection will impact compressor surge? Ideally I would get rid of the port shrouded housing for two reasons. They do increase spool time, and two they re-introduce water back into the intake that could cause compressor damage.

[audifreakjim]

I have been doing some fine tuning with det cans and cycling through and examining spark plugs. I do have some detonation, and it's the worst on the 1st cyl, and gradually tapers off towards #5. This tells me the water is going to the back of the manifold.

Does anyone have real world experience with port water injection? It would solve my distribution problems, but I want to make sure I do it right.

I am thinking of doing a .4mm aquamist jet in each runner, that would give me almost exactly 25% fuel to water/meth ratio. I am running a high speed valve, so I can always scale it back.

Ultimately I do need a new intercooler, Pressure drop is only 1.5-2 psi, but the intake temps are pretty bad when the WI is not active.

[Hank]

Hmmm. I think the only real issue is having hte ports all on checks so it isn't siphoning under vac.

I have been suspect of the IC for a while. Your car does some funny things. I think ditchign it for a Garrett core of half the size would not only be lower IATs, but take 30 pounds off the tip of the nose on the car.

Can't wait ot see the next evolution of the 'nanner

[audifreakjim]

I would hope the high speed valve would keep everything from siphoning.

[Audilard]

Check out this instal Jim.
http://www.alcohol-injection.com/forum/ ... stall.html

[auditude]

Lots of clean installs here:

http://howertonengineering.com/image-gallery/

[All_Euro]

Personally, I'd keep a check-valve or solenoid as close as possible to the nozzles… the Howerton Audi has a nice clean instal but I'm leery about the amount of unchecked line to each injector. Easily remedied though!

[audifreakjim]

I am hoping that what I come up with put everthing to shame in those links

The Howerton manifolds look nice, and are reasonably priced when you take into consideration the fittings they have included. I am thinking of ordering a 4 port, and adding another fitting to the end to make it a total of 6 ports.

Here is what I think I am going with. .5mm aquamist nozzles, in each port, and one .5mm nozzle pre-compressor. The port nozzles will be hooked to the High Speed valve, the pre compressor nozzle will be a simple on off solenoid to avoid large droplets hitting the compressor. This way I can control each one independently which is always nice to have. The port injectors will be large enough to satisfy injection needs alone, but will be scaled back a touch to make room for the pre-compressor injector.

Right now I am injecting about 5000 cc's of injector capacity, so this will net about 1200cc's which is 24% and about the max you will ever want to go. Aquamist flow rates are here
http://howertonengineering.com/tech-info/

[Audilard]

I need to do this.

[All_Euro]

Those Aquamist nozzles with built-in check-valves look promising… seem ideal for direct port injection.

[Hank]

Those nozzles are spendy with the check valves! They are more than most new injectors per cylinder!!!

You should ditch the waggy and let me build you an intake with port meth injection

[audifreakjim]

You don't need a check valve unless you have pre and post TB injectors being feed from the same valve. At first thought people think you need the valve to keep the vacuum from draining the lines. The issue is, that same check valve would also keep you from injecting any meth at all.

[audifreakjim]

Those nozzles are spendy with the check valves! They are more than most new injectors per cylinder!!!

You should ditch the waggy and let me build you an intake with port meth injection

Next round hank

[audifreakjim]

ImageUploadedByTapatalk1374359627.267454.jpg (59.28 KiB) Viewed 36617 times

It's go time!

[Audilard]

Nice Jim! I have an update coming as well, but it isn't good.

[All_Euro]

...that same check valve would also keep you from injecting any meth at all.

How so? I used to have a nozzle post TB & the w/m reservoir was draining awfully quick until I put a check-value in… not sure what its crack-pressure is on the valve (devil's own) but it seemed to work well.

When your nozzles come would you measure the depth of the threads? I think I'll order some too if they're long enough to secure to secure to an intake hose with a thin washer & nut.

Looking forward to seeing your install

[audifreakjim]

Did you have a valve or solenoid in your system or were you just kicking on the pump? I am running a PWM high speed valve, so no chance of draining the tank. The nozzles are about 4-5mm deep.

Buy the adapter specifically for what you are trying to do. There is not enough meat on these nozzles to pinch them into a hose.

[All_Euro]

Valve between the pump and reservoir as well as just before the nozzle in the compressor housing… had one just before the post TB location when it was in.

Thanks for the measurement - I'll pick up some snow or devil's own nozzles for now then as they have longer threaded bodies. The adapters are good but just too big for the small piping I'm working with ATM.

[85oceanic]

Right on Jim!

Nice Jim! I have an update coming as well, but it isn't good.

Darin? ?????? What did you do now?

[audifreakjim]

Version 1.0 of port water injection:


A single .5mm jet for cooling the air only. This is really just to get the IAC to pick up on the cooler charge air.



We will see, I could never hear detonation before, but my plugs would get some slight aluminum deposits on them. I have a fresh pair in now for testing.

[audifreakjim]

[85oceanic]

Dude, that's sweet! I like!

[Audilard]

Nice Jim! Have you checked compression in #5? I'm very curious to see how this setup works!