the real benefit from the larger throttle body comes from lower restriction to the airflow. if you think about it you really want the lowest restriction to the airflow to make the engine the best performance it can get. that's the reason we put air intakes on it to "smooth" the air flow or throttle bodies to open it up a little more. the larger throttle body will allow for slightly more airflow to the engine atthe same throttle positions. it just allows for the air to flow better around the butterfly and into the engine.

fastman or hughes or some other brandare going to be good for ya. either way they alldo the same thing. just gotta find the right price and the right requirements for that price.

 

I have a 1998 dodge 1500 5.9 how much speed do u think I could gain by getting the 52mm Fastman tb ??? I have the 4 door crew cab so its a heavy truck I have a hard time competing with anyone that's got a straight cab!!
Thanks

 

Surprised no one's mentioned this: why not save a bunch of money and bore out your stock throttle body? The stocker is 50mm already, the problem though is the bores have a ridge or bottleneck just above the throttle plates that necks down the size to 46mm right there.

Go stick your finger down in your throttle body while holding the plates open. You'll feel the ridge. Just take off the TB, disassemble it, and use a dremel or drill press with a small drum sanding bit to flatten that ridge so it's the same size all the way. Just be careful not to sand below that ridge.

I did this to mine and I noticed a difference. I had a flat spot midway up the RPM range at WOT and this fixed it. Also made my intake quieter.

 

fastmans if you mention you are from the dodge forum you get a discount.
also i didnt have to send my old one in as a core...[/quote]

how did u find out that we got a discount?
Why do we have to send the core back to them i know they give us 80 bucks back but why?

 

he has to have something to sell.... By sending your stock tb back in he has another tb to bore out and sell.


EDIT: wow way to resurrect a thread there...

 

can u explain this dremel thing ? I'm very handy but I need good instructions If u Really have done thins can u please explain I really appreciate it Thanks Erik

 

Here's the link for modifying you TB:
http://dodgetruckworld.tenmagazines....erformance_mod

 

well that way u dont have to read all that bs and what with the i can tell when yr at thing? ip yr on a mac?

 

Doesn't look like he did anything with the bores though. He just machined off the fins on the top. That does help a little, but smoothing down the ridge/bottleneck on the inside of the bores is what really counts. In order to do that, you have to remove the butterfly plates and the shaft they're mounted on.

The best way to go about it is with a drill press because you can set the drum sanding bit at a fixed height so you don't accidentally sand the bore walls where the throttle plates seat. Just reem out those bores with a fairly fine (120 grit or finer) drum sanding bit (can be bought at any hardware store) until the bores are the same size all the way through. You don't have to machine off the fins on the top (I didn't due to time constraints), but it certainly wouldn't hurt to get rid of those things.

Pimping the throttle body (polishing) is optional.

 

the fastman is not just bored out. it has bigger butterflies too. dan told me 50mm for 5.2,52mm for the 5.9,and 53mm if you are going with some type of forced injection on either motor. the fastman is cheaper than the hughs also.

and i donnt think you can get the discount anymore.