Track guys: Auxiliary Injection Discussion
 

I know a lot of folks really like auxiliary injection but wondering how many track folks use it.

I plan on doing maybe 2-3 track events a year and might put 10k miles on my car driving it on the street.

I’m a simple kind of guy and don’t really want to run WI if I don’t have to. Reading Fritz old thread, he didn’t really care for WI, not sure what his takes on it are these day.

Notice that ArmenMAxx does a few events a year and he doesn’t run WI. Local former rotary track guy Jacob didn’t run it in his FD.

My first event is in May so I have some time to think about this and wanted to get your thoughts and see how many track guys use WI and their take on it.

My current setup makes 300 whp
- Stock ports
- Coated HKS cast manifold
- Tial 44mm WG with 9 psi spring
- Garret t04e with a 57 trim / .86 A/R
- Modified CX racing dp, re routed wg into DP. Need to get some wrap for it.
- Tial BOV
- Blitz FMIC
- Koyo dual pass radiator, plan on running water and coolant
- R magic ducted dual oil coolers. Using a rx8 oil cooler on the passenger side
- Using OEM under tray
- Using OEM non vented hood

I've run a basic coolingmist water injection system on track for 6-ish years. Used their setup with the big tank that has the pump mount to it. Simple system where it turns on at 7psi, no fancy controllers or mapping to mess up. Didn't tune for water, just ran it as protection. 13psi on stock twins making 325whp.

You won't see it really driving down AITs, but I think it's been great for running 20-30min sessions in warmer weather. You can get crazy with the options/mapping/controllers but I wanted something simple where I just put water in it and go. You'll give up a small amount of power (5-ish hp) if you don't tune for it, but nothing concerning.

Nice. Where do you mount it and is this the kit you got?
Cooling Mist water injection

Do you have to refill after a 20 min session?

I'm in TN and it gets to 95+ in the summer with high humidity.

Keeping it simple, get the basic AEM kit. Use the factory windshield washer tank, and inject wiper fluid. Buy a new tank to minimize your chance of foreign debris. Plumb the novel closer to the cold side of the IC (vs the elbow) to allow for better atomization. AEM sells an inline filter that I recommend picking up as well.

The OEM tank isn't the biggest, but it's large enough that you'll be safely able to refill when you get gas, and between 30 minute on-track sessions as well :icon_tup:

Yea, I saw a thread where Dale is using the AEM kit and OEM washer tank.

Talked to Jerome about adding AI and he likes using the rear tank. Not sure if the rear tank wash tank is larger or smaller than the front tank.

Also talked to Ihor about purchasing the AEM kit.

Here’s a pic of my engine bay, wondering if I should put the nozzle before or after the BOV.

Attachment 614794

at your boost and power level if well tuned I wouldn't bother with it. Keep it simple. now if you were to increase boost/power then yes.

i do appreciate your keeping it simple plan. i like your TO4E 57 turbo choice given your power objective. nothing stresses our small but powerful motors like road racing as heat cumulates over time.

a simple water system will keep you on the safe side of detonation while cleaning your
motor internals.

since water works primarily in the combustion chamber and does not materially lower IAT, i suggest you locate an M10 (630 cc/min)nozzle in the silicone coupler immediately ahead of your elbow. place it at the 3 o'clock position (opposite the fender) so it opposes the elbow turn to the motor.

AEM recently way upgraded their system which i recommend.

Howard

I'm also in the process of installing AI. Here's what I've learned so far.

- The AEM kit does not come with a solenoid valve. The Coolingmist does (stage 3)
- The AEM level sensor supposedly has proprietary threads so if you want to install that on a different tank, good luck. I'm looking at a VW sensor ( ) that seems similar and will see if that works with the AEM unit (which I went with)
- The pump needs to be mounted below, or at level, with the fluid tank. This limits pump locations when using the windshield tank. I relocated my battery and am looking for a trunk tank to mount on the battery box, but all the ones I've seen are too big. I'm still searching tho

If you don't want put the nozzle in your elbow and are worried about a nut in your intake track, here's a potential solution. Water Injection Tap

Since you're single, you might also want to look into pre-turbo injection

Yes that's the kit I run. I will go through about 1/2 a tank in a 20 min session. I'm not sure how much the washer tank holds but you'd want as close to a gallon size as you can get to be sure it'd last.

so we got 3 votes for ai and 1 vote for no ai.

any others have opinions around this? would love to hear from some avid track guys.