Water/Meth - Direct Port or Pre Throttle?

[bolarbag]

What are the ad/disadvantages to the Direct Port Setups and the pre Throttle Locations?

 

I have seen some people say that problems have occured at WOT because they never had a fail safe when water/meth isn't distributed properly in each cylinder causing high egt's/knock conditions in some but not the others

 

Then I have seen that with Direct port setups you lose the cooling characteristics of the injection in the first place, but at least you get an even distribution, guaranteed lower egt's and slightly higher octane charactistics

 

could you please chime in what would be the best setup in terms of safety first, and any power increase second

[Ian C]

Aquamist say it's best to inject straight after the intercooler to maximise cooling, so it shows wha they think of direct port, and they are the daddies of WI.

 

I think direct port is mostly done because people equate it to nitrous or fuel injection, but WI is there to cool the intake charge, not fuel the burn. You can't have a cylinder distribution imbalance when the whole air charge is cooled at the throttle body or earlier - where the water ends up is irrelevant as long as it's atomised and taken the heat out the charge. The only time in fact you could get an imbalance is if you did direct port and one nozzle stopped working...

 

-Ian

[bolarbag]

where the water ends up is irrelevant as long as it's atomised and taken the heat out the charge.

 

Thats a very fair point:)

[Tricky-Ricky]

Never seen the point myself, as said charge cooling effect comes mainly from the atomisation of water, which has the knock on effect of keeping the combustion temps lower, however there is a school of thought that says direct port has a marked effect of further cooling and det suppression due to cooling of the inlet valves,

Using WI to improve performance involves complete control of both fuelling, timing and WI, plus a few fail safes.