[mjeffries]

I have the Turbonetics kit for the Nissan Sentra Spec V. The blowoff/bypass valve is set up to recirculate the air back to before the compressor when the throttle is closed. If I add water/meth injection would this damage my compressor at all? The water/meth will also be recirculated when the throttle is closed and I don't want to have problems with the water/meth damaging the internals of the compressor.


I hope that question sounds coherent. I feel like all I did was type "recirculated," "water/meth" and "compressor" over and over again.

[Robert]

Originally Posted by mjeffries

I have the Turbonetics kit for the Nissan Sentra Spec V. The blowoff/bypass valve is set up to recirculate the air back to before the compressor when the throttle is closed. If I add water/meth injection would this damage my compressor at all? The water/meth will also be recirculated when the throttle is closed and I don't want to have problems with the water/meth damaging the internals of the compressor.


I hope that question sounds coherent. I feel like all I did was type "recirculated," "water/meth" and "compressor" over and over again.

Your question makes sense but it shouldn't be an issue really. Basically you should set up your water injection nozzle to be after the BOV and before the throttle body or even more ideally spray it directly into the intake manifold by tapping the plenum. In the Z world people even have run the nozzle in a throttle body spacer to prevent this as well.

[mjeffries]

Per your suggestion I am considering buying a throttle body spacer and tapping that for the water injection nozzle. I have been doing some extra reading and found that some people claim that having the nozzle directly behind the intercooler would be best, as the water/meth has more time to mix with the incoming air thus making the distribution between cylinders more even.

Any thoughts on this?

[Robert]

Originally Posted by mjeffries

Per your suggestion I am considering buying a throttle body spacer and tapping that for the water injection nozzle. I have been doing some extra reading and found that some people claim that having the nozzle directly behind the intercooler would be best, as the water/meth has more time to mix with the incoming air thus making the distribution between cylinders more even.

Any thoughts on this?

I have never seen it routed like that personally. Most everyone I know either runs it in the intake manifold or just before the throttle body on the charge piping. I would think the atomization effect of the nozzle with the velocity produced as the air is just about to entire the cylinders would be better for a good mixture. Additionally sprayig that far forward in the charge piping would allow the fluid more time to heat up and reduce the cooling affect of the water/meth.

[Robert]

BTW Spearco/Turbonetics recommendation in the WIS install guide is just before the throttle body:

8. Use a 7.2mm or 9/32? drill bit, drill a hole in the intake pipe right before the throttle body and thread using
the supplied M8x0.75mm tap.

Link: http://turboneticsownersclub.com/turbos/wisinstall.pdf

[mjeffries]

I have recently ordered a water/meth injection system (not the Spearco kit. sorry guys, too expensive)

I just want to double check that having the nozzle a few inches BEFORE the throttle body isn't going to cause any trouble. Remember that the Spec V turbo kit recirculates the air when the throttle closes, which means that any water/meth mixed in with this air will find its way through my compressor.

[Robert]

Originally Posted by mjeffries

I have recently ordered a water/meth injection system (not the Spearco kit. sorry guys, too expensive)

I just want to double check that having the nozzle a few inches BEFORE the throttle body isn't going to cause any trouble. Remember that the Spec V turbo kit recirculates the air when the throttle closes, which means that any water/meth mixed in with this air will find its way through my compressor.

If the kit you ordered is anything like the Spearco kit it will stop spraying the minute you drop below a preset pressure ratio so any water/meth that got sent through would be minimal at best.

[mjeffries]

Thats so obvious, I can't believe I overlooked that. Yes, I plan on having the water/meth shut on/off at ~4-5psi.

But lets just say that each time a small bit of water/meth did make it to my compressor, how much trouble do you guys think that would cause?

[Robert]

Originally Posted by mjeffries

Thats so obvious, I can't believe I overlooked that. Yes, I plan on having the water/meth shut on/off at ~4-5psi.

But lets just say that each time a small bit of water/meth did make it to my compressor, how much trouble do you guys think that would cause?

Minimal at best. Keep in mind that any good W/I kit is going to do a pretty decent job of atomizing the water/meth injection stream. The pressurized air within the charge piping is going to further dilute that mixture into the air. Even if a small amount makes its way back into the compressor at the size its going to be its likely going to be WAY too small to cause any damage. That is provided the kit you purchased's nozzle does a decent job at spraying..

[mjeffries]

On the image below I placed a red dot on the part of the intake pipe that I plan on placing my water injection nozzle. Do you see any problem with this location? If the blowoff valve wasn't there I wouldn't hesitate to put the nozzle in the marked location but I just want to make sure by checking with you guys.

Thanks so much.