I have a Fastman 52mm Throttle Body on order. I was wondering if anyone can tell me what kind of gains to expect and where. Top end, Low end etc...

 

the biggest gain I had was the grin I couldnt take off my face... overall gains are across the rpm range.... low and high

 

so you really feel the diffrence with a fastman tb?? even on a 5.2? doesnt he just bore it out some more.

 

The biggest thing I noticed was that the throttle response improved a lot. The truck was not as "doggy" when accelerating from a stop. I did not get a gas mileage gain out of it, but it didn't get worse and the overall power and driveability was better.

 

The way I understand it (from the research I did before I ordered one) is that he bores it out, and also puts a smaller rod and thinner plates in it.

Thanks for the responses. I can't wait until it gets here.

 

You'll love it man. Like Steve said, you will smile ear to ear!

 

for the 5.2 get a 50mm TB... unless your gonna do some heavy mods... heads, cam etc...

 

nah im just looking to replace my stock tb with a better one.. 50mm will do. all im really planning on doing is getting a hypertech programmer, new exhaust (already have a 80 series flowmaster single in and out.) cai and 4.10's

 

I would also recommend headers... keeps the heat away from the heads as much as possible... I think it helps prevent cracks in the heads. Also make sure you do a 180 deg t-stat.

 

anyone try boring there throttle body out to 53mm ive got a spare one and it is but im waiting for my truck to run right before i put it on the guy that bored it out says it should be safe but its so thin