2003 Audi A4 1.8T - 400 HP max

[KraftwerkTurbo]

Preparing for the next step in upgrading, adding water/meth system.
Current setup:
larger turbo (larger than Frankenturbo, similar to 2860).
Currently 330 HP.
25 psi
550cc injectors
larger MAF
High flow exhaust
3" DP
FMIC
Custom tune.

Same setup on other car, but custom SMIC (IAT limited now).

Want to use wiper fluid bottle.
Water/meth controlled via custom tune.
Plan to run standard wiper fluid (30-40% meth content)

400 cHP max is the goal

a) what nozzle size?
b) one or 2 nozzle setup
c) best location for nozzle(s)
d) best location for pump
e) what parts/system/kit to order?

[Richard L]

Answers:

a) 450+cc/min (0.9mm)
b) One
c) at the exit of the intercooler
d) in the trunk
c) Aquamist HFS3-v3

[KraftwerkTurbo]

2 Nozzle setup:
1 nozzle in TB bracket, ca. 1" before IAT sensor but after TB): internal cooling, knock, octane boost, lower EGT, higher compression
1 nozzle after intercooler, ca. 12" before IAT (lower IAT)

Water/Meth: 65/35

a) Does the total of 450cc (from above, with 1 nozzle) remain?
b) How to split the (450cc?) total between the 2 nozzles

[Richard L]

I think one nozzle at the exit of the IC will be good.

[KraftwerkTurbo]

Originally Posted by Richard L

I think one nozzle at the exit of the IC will be good.

Care to share your reasoning?
My understanding is that for max effect, 2 nozzle setup is better than one nozzle.

From elsewhere:
Mounting a nozzle just after the intercooler provides maximum distance traveled from the spray point to the combustion chamber. This ensures that the mist is carried by the air for a longer time period. More time allows for more complete evaporation. More evaporation guarantees more cooling.

A throttle body-mounted nozzle works exactly the same way but in reverse. Less distance traveled = less evaporation = more droplets ready to turn to steam INSIDE the combustion chambers. This reduction in combustion temperature boosts the air/fuel charge's octane rating in a huge and very beneficial way. Of course, one may run a single medium-sized nozzle midway between the two ends. This delivers a compromised mix of both cooling and octane vs. maximum amounts of both.

[Flr Power]

Because 1 nozzle should be enough for 450cc/min. Now, 2 nozzles would probably be a little bit better. But by how much? Sometimes more or bigger is not always better.

Also keeping the system as simple as possible improve chances of failure by limiting the total number of components.

When you go above 500hp flywheel then 2 nozzles becomes beneficiary.