Hello
- Thread starter edog
- Start date
There was never a factory turbo 4.1.
I could've made all the power I wanted with the 3.8 but with the 4.1, spoolup with a big turbo is much, much better and there's a little more off boost torque. Basically I did it for drivability and since I was rebuilding anyway it didn't cost any extra. NA I believe the 4.1 made ~20hp more if I remember right. I will never go back to the 3.8 for a street car.
I could've made all the power I wanted with the 3.8 but with the 4.1, spoolup with a big turbo is much, much better and there's a little more off boost torque. Basically I did it for drivability and since I was rebuilding anyway it didn't cost any extra. NA I believe the 4.1 made ~20hp more if I remember right. I will never go back to the 3.8 for a street car.
Squid4life
Well-Known Member
- Joined
- Jul 5, 2004
depends on what all was done to it, kind of hard to guesstimate. cam, heads, turbo, intake, exhaust, chip, fuel pressure, etc. It all adds up. 
buickpower
polytetrafluoroethylene
- Joined
- Jun 27, 2003
pretty much impossible to nail down exact numbers, totally subjective. suffice it to say that the torque increase would be roughly proportional to the percent increase in displacement.
