315cc (or ml/min - same thing for water) is only for 250 - 400 HP.
A 630cc nozzle is for about 400 - 600.
The 155cc is only good to 250 HP at best.

You want to shoot high by 25% and dial back the controller.
Technically, I'm topping out the 315cc nozzle, but I don't need it as much as the SC does.

 

I wanted to change over to dual nozzles and get rid of methanol flowing through my throttle body.
Well, I drilled and tapped one.
This is with the 175 ml nozzle right after the inter cooler.
The outside temp is 82 degrees, the intake air temp is 85.
(The A/C is on in this test!)
Ambient air is in the upper right, Intake Air Temp is in the bottom middle.

I did find I can easily quench the engine with this much methanol water mix, so I set the "full" setting to a higher MAF number on my Variable MAF controller, methanol still starts at a low MAF setting, but does not get "full strength" spray till a higher MAF setting.

My method of drilling was with help from several RX8 board members:
I removed the Pettit upper intake manifold.
I cut a paper plate to make a dam to contain the shavings from the drilling and tapping.
I used duct tape to seal the piece of paper plate to the inside of the inter cooler output.
Do not take any chance with shavings getting into the engine.

I also added the finished picture. (I will do the intake side to add the second nozzle another day)

 

??? 175cc "quenches" the engine?
I've put the controller in "test" mode (ramps up to full-on and stays there) with the 315cc nozzle and the motor doesn't even react.
I've emptied 1/4 of my 1/2 gallon bottle like that and there was no change in idle at all.
Maybe its the low humidity here...

 

It's sort of strange with the "full on" set low on the variable MAF triggered controller:
The initial take off is fine, full throttle after spin up is fine, but at middle MAF flow I was feeling some quench.

I wound up setting the MAF controller to allow the initial flow starting at 1.0 and full flow coming in at 4.8.

I have no leaks, I no longer have Boost-Juice dripping from the air filter like my old MAF housing injection point.
Next up, I want to try it with no water; just straight methanol with 15% nitromethane!

 

damn...soon you lot will be using full high explosives by the sound of it!

Be careful!

 

Well, there is your problem. What is the point of using a progressive controller if you are going to set it up like that?
Set the "on" point to about 3 PSI and the "off" to just slightly above your maximum boost.
Size your nozzle accordingly.

That said, you should be able to turn the 650cc nozzle on at idle without any "quench" or whatever.
What you are probably feeling is lean misfire.

 

Um, A MAF trigger does not "do" PSI.
My lowering the flow was due to my car being daily driven, and there was too much methanol at a low speed part throttle.

 

Isn't nitromethane an "alternate fuel"?
We are doing our part by going "green"
(The Methanol nitromethane mix is green colored)

 

I think the humidity down here has a lot to do with it, because we don't need at much flow to get the charge temps down. Juan flowed about 300cc/min and lost about 25 hp, he backed away and flowed 160ccs/min, got the hp back that he lost, and kept his charge temps to just above ambient. If you need 650cc/min of flow, it has to be that dry desert air, or that turbo is heating up the charge more than the supercharger. My guess is the dry air. As I type this we're at 85% humidity over here.

Make sure you have a fire extinguisher handy, and get yourself a flame suit. We don't want you to be known as Rote8 because you rotisseried yourself.

 

85%.................damn, I knew it was dry out today!

 

85% humidity.................OMG how can you breath? Presently our humidity is 8% and dropping with a temp of 106 (8:22am). Expect only 115 today with about a 6% humidity rate. I wonder what it feels like to live in water? - You guys have got to have webbed fingers, feet and gills.

 

Yep, we do........we live in a swamp!
Actually.........85% is about norm, or even low for 9 months out of the year.
Rarely does it break 100 degrees, but it stays at 90-93 with 85% or better humidity for at LEAST 6 months and probably more like 8 months. At least I live one block from the beach on the East Coast of Florida so I get a breeze almost all the time. Bastage doesn't get the same breeze living across on the mainland only 5 miles away.

 

The humidity here can get pretty bad... it can feel like a sauna. Especially when the sun is out during a shower.

One of the reasons I'd like to move up north a bit within the next few years.

Yeah, we're almost exactly 5 miles away from the Atlantic, and it's definitely not as breezey, but it's still way better than it was in Orlando though.

 

We love the humidity it keeps our significant others Wet or pre lubed how ever you want to put it lolololoololololololol

 

OK then. Set your "on" point to 115g/sec and your max to 350g/sec.

8% humidity?!?! OMG how can you breathe?
Its 4% here today.
We had a 2% day a few weeks ago.
It was 35% last night after the rain. I had to put on my SCUBA gear.

 

I'll remember to bring wet towels when we meet. That way you'll feel at home

 

Bco007 / Bryan
Florida
MT
Pettit Racing

 

That looks brand new - 1st post also- Welcome to the group. You will find us helpful, argumentative, full of BS and above all fellow Pettit s/c owners. Need questions answered? - just post them and stand back for the onslaught of good information and arguments .



WELCOME BRIAN

 

Welcome to the club man, where in Florida are you?

 

easy there jerky!

beers

 

He's right though.....and you know it!

 

Brian are you going to go to the homestead speed way saturday?

 

Thank you every 1 lol im located in aventura fl near the mall. Umm im considering going i really want to see what my car can do just call me if ur gonna go maybe well ride out together.

 

Bring your rain gear - they are calling for monsoons Saturday late afternoon and Sunday. Of course the storms are coming up from AZ. Seems to me it's a little early for the monsoons.

 

kinda, but when i move to the coast it will be naples!

and 20 min after the shower, you going to have crazy 18% humidity!!!

beers