IDSTROKER
Blackfoot ID
i have been looking at installing a GTP38R turbo on my truck but from what i can tell they seem to not carry as much boost as the stock turbo's from what i have been reading why is this .
Question turbo
- Thread starter IDSTROKER
- Start date
DaveBen
SDD Senior Member
The Aspect Ratio (A/R) is what determines if it makes a ton of boost down in the low rpm or if it makes the boost up higher in the RPMs. Just like a manual tranny. If you start out in 1st, you can't go all that fast, but if you try to start out in 4th, it will barely make it out of the starting line. Fixed A/R turbos are this compromise, you can have the boost at starting off or high up in the RPMs. Your choice. The variable vane turbos take care of this but it takes a computer to do it.
Dave
Dave
Even VGT turbos in oem use suck down low. The tuners are what makes them act like u think they should if u look at them on paper. Never understood that, every VGT ford puts on acts like a fixed unit that’s sized wrong from the factory.
