I just got the car back together from adding 720 secondaries. It had the same problem before this as well.

When you slip the clutch you can feel grinding on the clutch pedal.

When you give it gas in low rpms it will hesitate/ rev slowly.

Once it gets above 4 grand its like a rocket.

I have to slip the clutch severely when I am starting off.

There is a hissing noise from the turbo side of the engine. I think its a vaccum leak.

Any other things that could be wrong?

 

Anyone?

 

[QUOTE=tIIsleeper]I just got the car back together from adding 720 secondaries. It had the same problem before this as well.

When you slip the clutch you can feel grinding on the clutch pedal.
Not sure if your mistating normal clutch work or if its the throwout bearing

When you give it gas in low rpms it will hesitate/ rev slowly.
Sure your just not laying the plates wide open at a low cruise and feeling the motor trying to catch up to you?

I have to slip the clutch severely when I am starting off.
y?

There is a hissing noise from the turbo side of the engine. I think its a vaccum leak.
Then fix it

 

Sounds like you've already figured out your two problems... why haven't you looked at and/or replaced the clutch yet? Fix that vacuum leak as well.