is it a good idea to put nozzle before impeller , immediately after turbo , or under carb. i was told to spray before impeller to pack more air................which of the three would be most efficient

 

before impeller .
it will give the air more time to cool.

 

i run a supercharger and they told me to run it under the carb. i am using the snow kit. i was told that if you spray before the carb it can
interfer with the signal and can make it run lean. jet up if your spraying before the carb. I am going to try to run one under the carb and split it off and run the smaller nozzle right after the charger and see what that does.

 

I just made a alky water injection kit for mine. It is basically a mr. freeze style kit. I took a radiator overflow bottle, run the hose from the bottom of the tank to the compressor inlet and the hose from the top of the tank to the vacuum tree on the firewall. I put a .030 mig welder tip in the end of the hose at the compressor to limit flow.

I just run it up on the transbrake and it sprays really good at 10psi. I flowed it at 20psi and it shots appox 1/2 oz per second.

I'm planning on taking it to the dyno tomorrow if they have any open spots. I'll let you know how it works out.

 

turbobirds,
what mixture are you running?

 

why the hose from the vaccum tree to the bottle? i understand the hose from the turbo to the bottle its to pressurize it. just curious cause im wanting to do mine that way i went through the trouble of putting a old stock mustang efi pump in the bottom of a gm truck coolant bottle that is activated by a hobbs switch at 1 psi of boost then sprayed into a old nos plate.i think the way im doing it it s spraying way to much into the engine

 

Are you using pills to control the flow? Maybe you'll have to braze or epoxy up a few holes in the spray bar or even fit a new spray bar with fewer holes.

 

yeah im using the smallest jet that i could find its for a 25 shot i think. it just that its not really a fine mist of fluid coming out the plate it kinda just dumps large streams of fluid in the motor. i want to redo it so im not relying on a electric pump. if it goes bad middle of a run it might not be good.would a old fogger nozzle do better? i dont know id like to hear what some other people have done

 

Typically with a EFI set-up using methanol you would run methanol through the injectors in the normal locations and then also fire a couple of injectors BACKWARDS into the air coming out of the Boosting Device vs injecting it before the Boosting Device wheel. The wheel would just throw the methanol to the outside of the scroll where it would condense vs firing it backward which actually causes the methanol to get blown into much finer particles of fuel and cools the charge at the same time. Before the Boosting Device you would also pick up heat from that device.

For a carb deal I would fire in backwards fairly close to the discharge to give the methanol time to pull away as much heat as possible before getting to the carb and also be as fine of a mixture of methanol and air as possible.

JMO

Tom V.

Ps The same strategy was used on a 2885 HP EFI Traditional Pontiac engine posted on this board.

 

Just be aware that the water and/or methanol being injected before the inducer my act as a saw and wear on the compressor wheel. Don't underestimate the power of a liquid under pressure over time. . .just look at the Grand Canyon.

 

Boost Engineer, would the method you described be with, or without an intercooler? Just curious if the alcohol would stay suspended in the air stream of if it would separate inside the intercooler. I have heard several people speculate that the mixture would separate, and I tend to agree, but I have seen no actual testing.

Thanks-
Eldon

 

I personally would see any reason to "piggy back" methanol and an intercooler. I would use one or the other.

 

Typically with Methanol you would NOT use an inter-cooler.

If you went from the boosting device to an inter-cooler and then to the methanol injector
prior to going to the engine you might see some further benefit in charge cooling.

Tom V.

 

Exactly, I have big issues shooting liquid into a turbine spinning 70k rpm. I've never seen a draw thru turbo/centi and there is probably a reason for that.

 

Eaxctly how I do mine.

Turbo -> intercooler -> carb hat, alky nozzle about 6" before carb.

Never noticed any weird A/F changes...

 

I know Steve Morris is shooting his meth in the inlet of the Procharger in his Wagon.

 

Bringing the thread back Just seeing if any others are putting meth before the turbo. I was going to try this with a junk turbo and see whats up. I saw a post somewhere that a guy reported his IC pipes frosting up injecting meth before the turbo.

 

Tom,

A seasoned thermodynamicist as salty as you understands that heat added or removed from a process is present or absent from that point on to the end of the process, eh?

The BTU removed from the process by the change of state of a given mass of methanol does not change because of the point in the process where it occurred. I mean, the amount of heat removed is the same for the same amount of methanol.

Is there a difference in exhaust temperature if the same amount of methanol is injected before or after the compressor? I haven't had the pleasure of measuring a change such as that.

Isn't cooling the compressor a good thing?

 

Very interesting

 

I run 50/50 meth/water Preturbo Injection on my GN and I gained 1 solid PSI vs not running it. Preturbo needs for the nozzle to release a very fine mist and kits like a Devils Own 1 or 2gph nozzle with 150+ psi line pressure will give you the micron mist needed to not hurt the wheel with the droplets. BTW, don't use a progressive controller for Preturbo, Hobbs switch is just fine ( mine is set at 16psi turn on ).

Spraying Meth before the carb will make the AF/R fatter FWIW.

OP, run both Pre and Post turbo injection and ditch the intercooler, I did along with E85.