Anyone has a rough idea of the kind of velocity air is flowing thru the UICP thru the RPMs?

 

Depends on the boost level. For example, on my 2G, I have DSMLINK where I can monitor airflow through the MAS. At 23psi on a GT35r equivalent turbo, I was flowing 43lbs/min on pump gas with 16degrees full timing advance. Now take into account that is what the MAS is drawing into the MAS. Between the MAS-turbo, turbo to LICP, then through the core/endtanks, then up the UICP and into the motor, given there is zero pressure loss, I would say I was flowing 43lbs/min. Now understand 100% of what the MAS is seeing isnt actually getting to my motor unless I have a PERFECTLY efficient FMIC, zero boost leaks, and zero pressure loss -which is impossible. So..essentially you'd have to tap into your MAS and see what its' seeing either in karman (through an SAFC) or an EMS system. HTH

 

The speed of air flowing through the upper IC pipe is determined by the volume if air being consumed at a given point, not the boost pressure. Increasing boost pressure increases the mass of air for a given volume.

Peak velocity of airflow through the upper IC pipe occurs at the point of peak hp. If one estimates the approximate theoretical volume of air being consumed by the engine at that point, he can estimate the velocity if he knows the ID of the pipe.

 

Here's a quick calculation I did assuming a 2.5" OD upper IC pipe, which has roughly a 2 3/8" ID.

Flow rate, velocity
450 CFM 60.9 ft/sec
500 CFM 67.7 ft/sec
550 CFM 74.5 ft/sec
600 CFM 81.3 ft/sec
650 CFM 88.0 ft/sec
700 CFM 94.8 ft/sec
750 CFM 101.6 ft/sec

 

That table works for what the MAF sees, but not the IC pipe. Calculate for 250cfm, and that will give you what a 2.0L engine moves at 7000rpm assuming 100% Ve.

 

the reason i am asking the question is to see where the best place to place my water injection nozzle. was deciding either immediately after the IC or the UPIC. with all the info from you guys, i think i will put it immediately after the IC

 

I would suggest about 4-6 inches away from the TB. Not right after the IC

 

Ahh.. okay. That makes sense.

 

thanx for the advice nick!

 

Your very welcome.
You will find that the water will atomize very well atthat location and depending on the spray pattern, angle and pressure of the water.

 

there have been a number of very informative posts concerning injection location on the aquamist board. http://www.aquamist.co.uk/phpBB2/index.php
however if you are lazy, Richard Lamb The Aquamist guy, has a "ask him questions" post in
"general engine management forum"

his credentials are unbeatable.

 

The injector will be a 5gph. i got a choice of either 80 or 160 degree(angle) spray, both in a hollow cone pattern. The water will be injected prependicular to the flow of air and water will be maintained at 100psi +/-1psi(will be bypassing the pressure switch on the shurflo for an external pressure switch). There is also an inline accumulator 1) to even out the pressure pulses of the diaphgram pump and 2) the pump does not have to turn on ever time it hits the preset pressure.

since i'm at it..injection will be pulsed in sync with the fuel injections using the aquamist FiA2/HSV. With the 5gph nozzle, water to fuel(vol%) will be at 14.3%@0psi tapering to 12.3%@25psi

 

I would stick with the nozzle at 80 degrees IMO.
It sounds like you have thought this thru well. Let me know how you make out.

 

looks like we've got some talented MechE's on this board....Good to see.

 

FWIW, I have a very difficult time believing that an $800+ water injection kit is going to equal, much less beat the proven results of the $500 methanol injection kits used by a good few EVOs (including my own). Just FYI.