Why do i have vocal microphone delay?

Blue yeti pro plugged in wit xlr wires into scarlette 2i4 and when i want to listen while i sing it is delayed ? Also what would be a good voice filter for rap vocals ?

Where could i get asio drivers ?shouldnt it already come with sonar ?

This is a USB mic, isn't it?  These were designed for podcasting, not music recording.  No doubt you got that because you don't have an audio interface to plug a "regular mic" into.
 
Sorry, I don't have any experience with a USB mic, so can't offer any specific suggestions. 
 
I'm sure there are folks here using USB mics, and will be able to help you.  Good luck.

Okay, I just googled your mic and it's an odd duck: a combo digital (USB) and analog (XLR) mic.
 
It sounds like you're trying to connect the XLR end which (to my mind) shouldn't require drivers.  Is there an analog/digital switch you may have overlooked?
 
Read the manual again, and make sure you are following the correct steps.

Besides the audio driver and buffer configuration, watch out for the latency caused by certain effects used in your project. (Search for Plugin Delay Compensation, or PDC).

Latency in at the lowest and says its .10sec of difference ... But i hear the difference lime crazy

My bad, its an acer aspire T

If you're using the Windows native drivers, you will not achieve low latency with those. If you're not sure whether you're using the Focusrite ASIO drivers, which should give low latency, then I recommend contacting Focusrite support. 
 
Don't get discouraged, this is all super-daunting when you're just getting started because you have to be enough of a computer jockey to get things up and running. Once your system is purring along life gets better  
 
 

Windows 10 acer aspire T
Processor: AMD A10-7800 Radeon R7, 12 compute cores 4C +8g 3.50GHz
RAM: 8g
1000g storage
Sound comes out of earphones plugging into scarlette 2i4
Mic is a blue yeti pro plugged into scarlette in 2 in ports, left and right

Any ideas to a solution?
P.s i had delay problem when i plugged the mic using usb connection.. Now im plugged in directly into scarlette using 2 xlr cable one for left one for right to get more direct sound from mic but now it has airy weird interference kinda sound ...

Ok let's start over because there is a lot of "noise" in this thread (no disrespect intended).

You're hooking up your mic correctly, XLR to the Focusrite is fine. You were right to discard the USB connection. If you did not install drivers for your Focusrite yet, go to their website and download the latest ones for your device. After installing them, go into Sonar, hit P to bring up the preferences and make sure the "driver mode" is set to ASIO and your Focusrite ASIO driver is selected. These settings, annoyingly, are in different tabs but you should find everything you need in the top few tabs.

This should make Sonar a lot more responsive, BUT, for recording live instruments, the feature you're really looking for is called "direct monitoring". Sound that you pass through Sonar will always have some delay. While it's possible to get it really low, that requires very good hardware and often a lot of fiddling. For this reason, most soundcards offer some form of "direct monitoring" - a hardware connection between the inputs and outputs. On your device, next to the main volume dial, there is a dial that sets the balance between playback (signal from Sonar, like your previously recorded music) and input (whatever you have plugged into the front inputs). If you want to record with no latency at all you use this dial and set it somewhere in the middle so you can hear both your mic and the playback from Sonar. In this case you TURN OFF input monitoring on your track in Sonar, because then you'd hear your voice twice (once from the input and once from Sonar with a slight delay).

The main drawback of this approach is that you can only hear the direct sound of your voice while you're recording, meaning without any effects you might want to put on it. Of course after it's recorded you can hear any fx you like. If you can live with that it is by far the easiest and most reliable solution.