Cold Start Injector

[Lextreme II]

Hello All,

Does anyone have a good grip on cold start injector?
What is the flow rate?
How is it being control?
Can it be control by an extra injector controller?
Can i add 2 additional cold start injectors and use it like extra injectors?

 

[Toysrme]

Cold-start injectors are a solenoid with an atomizer on the end of it.
Give them specified votlage (12vdc) and the solenoid opens, letting ufel run through it.
There is no adjustment, they're either on, or off. No pulsing.
Most are in the 100cc, 125cc, 150cc range.


Good atomization tho.

 

[Toysrme]

Starting to spraying


Same thing

 

[Toysrme]

Oh, & yes, you can use them as an extra injector. They're quite common.
Control is as simple as buying a boost pressure switch on ebay. The cheap ones run about $3 & have a small built in relay.
What you get into is that 100-150cc of fuel isn't a lot.


What they're really good at is adding a little fuel immediately when boost hits. In some cases, that's a hard thing to do if you have a pigyback that can't see boost.

 

[Lextreme II]

I am just suprise it only have about 150 cc. I was hoping like 600-1000 cc..

 

[Toysrme]

Nope. You have the CIS (Continuous Injection System) Bosch used very early on. Volvo's used them for awhile.
They're like 330cc, but at a very high fuel pressure (like 70-90psi if I remember correctly)


Basically instead of pulsing the injector, most of the adjustment range was from changing the fuel pressure.




You could always adjust it also. Just knock out the brass atomizer in the end, or cut the end off. Then carefully weld / braze on a new atomizer. It'd be hard to figure out a common atomizer that would work.

Maybe a carb jet fitted would work well enough.

 

[Lextreme II]

how about a NOS injectors.. that is like a little hose....

 

[Toysrme]

Sure. The problem is that they are not tuneable. All of that stuff is either on, or off. That makes them not very good to support power. On/Off injectors really shouldn't be used to support large gains. They're good for small things, or light tuning tho.

It's one thing to add 100-150cc with a CSI at the beginning of boost to keep the ECU from tuning the change out, or add it to a car that's right on the bubble of being lean.



If someone is just really cheap & wants some power, you could drill bunch of space for a bunch of CSI's & stagger them with different pressure sensors. There have been a bunch of people that use multiple CSI's, or foggers, or atomizers.

It's not as good as a tuneable injector, but when you get down to it, it really doesn't matter (as long as you have the fuel to support it). It's more akin to carb jet's coming on & off.