beefhole

iTrader: (29)

Hello,
I've been reading a lot about aux injection and I am interested in running water only. I am not a tuning expert, but I am tuning my own car and so far I have not blown anything up!
I have a mild street ported engine, a haltech E6k, 550/1600 injectors, greddy td06-20g (down the road I will run a BNR), FMIC, stock ignition and plugs. It runs 15psi, but I am conservative on timing and fuel. AFR's are high 10's throughout. IIRC my timing at 15PSI is 13 leading, 15 split. It ramps down from 28L/0split at 0psi.
Later down the road I also want to do HPDE events with this car and will need some added "safety". For now though since I am my own tuner, I like the idea of water for safety, but not a substitute for proper tuning.
I found this nice product and am wondering if I can place the water nozzle here?

I know I should place it after the AIT sensor. In this case it is a little bit behind but is it too close to the throttle body?

Thanks for looking.
edited...

arghx

iTrader: (3)

Don't be surprised if you need an ignition upgrade.

beefhole

iTrader: (29)

even with a simple 300cc water kit? how will I know if the ignition needs an upgrade? I have an MSD 6A box sitting doing nothing, I could put that on the leading.

tom94RX-7

iTrader: (5)

Should be Ok in that location if that's where you want it, and based on my experiences it doesn't really matter where the ait sensor is either before or after the water injector. If you already have the msd box then you should use it..

beefhole

iTrader: (29)

That TB piece looks good though? I plan on tuning the car without the water, but I like the extra safety.

thanks.

Sgtblue

iTrader: (16)

I don't think you need ignition for the water and a properly sized nozzle. At least I've seen no need for ignition amplification on mine. But I do think you might need it for the boost levels.

As for placement before or after the AIT there's differing opinions, but I don't think it'll make ALOT of difference with water only. Water isn't as efficient at cooling the charge air like alcohol and it doesn't have alot of time to cool the air anyway. It's main benefit will be cooling the combustion chamber and carrying the heat out the exhaust...avoiding the temp spiking (and associated stress) from periods of hard boost while controlling knock and carbon. There's that safety you mentioned for HPDE.

There's also this from Mr. Coleman .......

beefhole

iTrader: (29)

Thanks everyone. For now, it's winter and I'm not installing these things anytime soon. I will continue derping around and slowly playing with my tune, best to tune in cold weather...

tom94RX-7

iTrader: (5)

and then when it's warmer check your Afr and your air temperature correction table

beefhole

iTrader: (29)

^

BDC

You can add one degree of lead advance and bring split down to 10* assuming it's pump fuel even if it's 9:1 rotors.

Don't run any higher on 9 plugs all around boost-wise.

I'm of the opinion that water is principally used for combustion chamber cooling so that throttle body inlet adapter in my opinion is a great spot. 300cc ought to do well for you I think.

And like Arghx said, don't be surprised on ignition. It might not be a bad idea to look into CDI for the leading coil(s).

B

beefhole

iTrader: (29)

I run 7&9 plugs now, think I should switch to 9&9? Will this make the car a little harder to start cold? It's starting/driving well now, I would like to drive it, even during the cold winter months. Heck, I'm paying insurance on it all this time...

I will drop the split a little. Running 93 octane on 8.5 rotors.

Sgtblue

iTrader: (16)

I would for 15 psi of boost. But not just because you have AI.

AngryPerson

Really? And you fancy yourself a tuner? How can you make such broad generalizations without ANY knowledge whatsoever. In general or about his car in particular.

FWIW, I run 19* leading, 10* split, and 12:1 AFR's @ 15psi @ 8k

Unless you know EGT's, how can you really give advice on tuning?

BDC

I'm personally a fan of a generally colder plug on these engines. I'm a fuddy-duddy who'd like to run a cheap 10 heat range plug in the trails at a bar of boost.

A 9 in the leading won't make it more difficult to start cold. Not really. Most folks who do the typical 1bar of boost on a larger T4 type turbo thing run 9's all around. It'll work just fine. The 7's can be too hot under repeated heavy loads on the same kind of setup.

B

beefhole

iTrader: (29)

Sounds good. I figured on a track day I would have an extra set of plugs and was thinking to run all 9's then.

I don't have an EGT gauge, and I won't. I know it's a bit "blind" but I don't need to squeeze every last bit out of the car. If my tune is conservative (and safe!), so be it. I don't need the fastest most powerful car.

BDC

With what you're doing with the car, you really don't. You're doing hardware-wise what's been long established in the community (standalone, decent sized single turbo, that kind of thing). Sticking to the tuning parameters for it and it'll be just fine.

B