3.8 prob
 

I bought a 3.8 and it turned out to be slower than my turbo motor. Can I get some help here?

Which 3.8 did you buy?
What car are you using it in?
Is it a newer Zip with a revised board?
It could be a few things down to you getting a bum motor.

I got the 3.8 from QFM and I'm using the RX8 pcb. I'm planning to switch it out for the automodilissta one. (or however u spell it)

The rx8 pcb should be fine with any rpm motor. I don't know first hand which motors qfm sells but I'm pretty sure they're pushing bit style motors (with the small tab contact on the ehdbell of the motor). I had a problem with bit motors not making a good contact in the zips. Most times if you turn the motor in place so the tab is pointing towards the back of the car you'll see a boost. I'm pretty sure it's a contact problem but it could be a bum motor. Have you tried the motor in a bit or clone? What color is the motor?
QFM is here in the states so a refund or replacement should be easy if it's a bum motor.

I used it on my bit and it didnt work...and the back is pink.

I had one of those and the thing died within a month. I say return it and ask for an exchange or refund.