Jet Positioning - Before Intercooler or After?

[Jezz]

Hi Everyone,

I'm looking for a bit of advice on where I should install the water jet for my application; I have read the Aquamist installation manual and the two candidates are before the intercooler, or immediately after it.

The engine will be running ~500bhp (around 200% increase on std) and the car will be used as a track/drag toy, but also on the road.

Bearing this and the description of the 3 jet positions from the installation manual mind, my opinion would be to put it after the intercooler due to the car not being an out and out racer, that's also to be used on the road.
However from the pictures below you can see that I have a pretty short piping run between the IC outlet and the throttle body, and my concern is that this may reduce the WI effectiveness.

Can anyone offer any advice please?
What would be the potential pitfalls of putting the jet before the IC, is water collection in the IC a problem?

If it makes a difference, I have the Aquamist 2c system with MF2, and plan to use the boost controller MAP Sensor signal to map against.






Many thanks,
Jezz.

[Trickys14]

Hi Jezz :smile: nice short pipe runs, even though its short i would still be inclined to position the jet on the IC outlet, reason being if placed before the IC you increase the risk of droplets forming through the IC core which is the reverse of what you want, there is always the option of going direct and placing a jet on each intake runner or even above each runner on the plenum, anyway i'm sure Richard or someone will be along to give a few more incites on the best option.

[hotrod]

I'd suggest as far as you can from the throttle body on the outlet side of the intercooler. You only need 8 inches or so ( 20 cm) to get fairly good distribution. If you can put it in the top of the intercooler elbow where it is easy to access and service without interference with the hood (bonnet), then I would go for that location.

Larry

[Jezz]

Hello Tricky, small world eh?

Thanks both for the thoughts.

I'm a bit paranoid about running direct port incase one blocks up as I think it will be hard(er) to fail-safe against, besides it's a lot more grief.

I guess the question is now, what sized Jet?
I have a few, but the biggest is 0.9mm, I'm thinking perhaps I need to go to 1mm?

[Trickys14]

Its a bit of a problem when your running toward the edge of the performance envelope, as you will be, 500bhp CA18DET :shock: are you using a DDS3? i would be inclined to at those power levels and tune, what ECU? at least then you have blocked jet warning and an automatic map switch or boost cut,
The trouble with using a single jet in your instance is knowing how well the individual port distribution is, yours is an aftermarket plenum? is it flow tested? i can understand your worry over individual port injection, not being that easy to detect jet problems, if you are confident your plenum flow then a single jet should suffice, as for size there is a chart floating about somewhere on here :wink: i am running a 1mm on the supra, but you need to calculate water against the amount of fuel thats going in.

[Jezz]

LOL 500bhp CAs are 10 a penny now. Well almost.

No I'm not using a DDS3.
I'm using the std ECU for the engine, but an MF2 for the WI. I believe the MF2 has some fault detecting ability? Though I plan to cover most bases as I'm a bit paranoid about blockages/running out of water etc.
I'll be using boost cut by cutting the power to the AVCR solenoid on a failure.
The plenum is a flowed aftermarket plenum yes, the same as JezH was using.

I'll have a scout around for the flow charts, actually I seem to remember seeing something in the instrution booklet.

What sort of power are you running in the Supra?

[Trickys14]

Originally Posted by Jezz

LOL 500bhp CAs are 10 a penny now. Well almost.

No I'm not using a DDS3.
I'm using the std ECU for the engine, but an MF2 for the WI. I believe the MF2 has some fault detecting ability? Though I plan to cover most bases as I'm a bit paranoid about blockages/running out of water etc.
I'll be using boost cut by cutting the power to the AVCR solenoid on a failure.
The plenum is a flowed aftermarket plenum yes, the same as JezH was using.

I'll have a scout around for the flow charts, actually I seem to remember seeing something in the instrution booklet.

What sort of power are you running in the Supra?

What you mean that they have found a miracle cure for the dogey big ends :lol:

The Supra is still just a baby on BPU but with a few little tweaks like emanage ultimate and Aqumist of course, but been having problems with the twins, so either low boost or to much, made 362 bhp at just .9 bar but i haven't finished the mapping higher up the RPM/boost range, so i should be able to make 380-400 bhp, thats if i don't go single in the meantime :wink: