What about the Holley throttle bodies? Are they any good?

 

The FastMan TB is worth it.
Like RacinFan said... mention these fourms and you will get a better price.
You will notice a difference.

 

This 50/52mm debate has me thinking... if your only opening the throttle part way during acceleration, wouldnt the 52mm flow the same at a lesser throttle position and still give the same amount of torque?

really what i'm trying to get at is I think the 50mm vs 52mm is only obvious at WOT... the motor will only flow a maximum amount of air at whatever it's current bottleneck is... at WOT, if you have a small filter then your limited by what that filter will flow, same for the exhaust, small exhaust would have the same affect. open them up and then you move the bottle neck somewhere else (heads, intake TB etc)

what do you guys think?

BTW, the fastman was one of my best mods...!

 

When you sell your truck for a 3rd gen, ship me your 52mm Fastman, and I will throw it on my 5.2 and tell you if your theory is correct.

 

I agree. I know I've read somewhere that Dan recommends the 50mm for the 5.9L if you are towing, which is where you need low end. I would like to see some numbers for torque at the lower throttle settings.

To continue your line of thought, if you are flowing the same amount of air with the 52mm at a lower throttle setting, how does the TPS play into the equation? Unless the computer adusts itself, it would send less fuel through the injectors because you the throttle isn't open as far, although the MAP sensor should sense the increased air flow. Hmmm... maybe someone with a better understanding of how all the components work together can answer this.

Also agree with your statement about filter restricting flow. We debated this on another post awhile back.

Starting to hijack the thread here, so I'll help it out by asking this question - Has anyone tried to return their tb to fastman because they were disappointed or decided to upgrade to another tb after getting the fastman? I've never heard of anyone complaining on searches that I've done, so if you don't mind parting with the money, it is probably a good investment. If you are handy with tools, you can port the throttle body youself. It won't be as good of a job as a fastman because he puts in a smaller shaft and thinner butterflys that helps to improve airflow. There is information on this and various other websites on how to perform the job.

 

EVERYONE who has bought one has loved it. I havent heard of anyone returning one. the thing with the map & tps sensors... the map is measuring vacuum not air flow. That, the tps and the o2's will determine how much fuel to dump. There is a way to adjust the tps for performance... drill out the mounting holes so you can adjust the output voltage to .75V... it's been determined by others that that output voltage at idle provides the best performance.

 

So by drilling out the holes, I assume this allows you to rotate the tps on the tb shaft. You could compare this to adjusting the timing by rotating your distributor on the older engines. You are just adjusting the voltage output of the tps. Good description, I had read abut it before, but never quite understood the purpose. Thanks.

 

I love my Fastman TB 52mm on my 360. I am not a performance guy, in terms of knowing the stuff alot of guys on this board know. I just know that my baby really books w/the fastman. I love the power. I now turn my o/d back on as I get ready to hit the highway. I used to leave it off until I got to posted speed as it seemed to lack in pickup. Not that way anymore with the fastman tb. I still leave the o/d off for everyday driving around town. For a regular guy like me who doesn't know all that much about quarter mile speeds etc. the fastman has definitely made the truck more responsive and I feel the power difference.

love it!

 

Not trying to steal the thread here.. but someone was saying on the other post and along with some other dodge owners that I have talked to that leaving the o/d off in town can be bad for the tranny!! I havent personally talked to a tranny guy to know.. thats just what I heard. I have a 5.9 to... did it help for off the line or just top end??? Sorry for butting in..

 

Never heard that one before. If the tranny is having to constantly shift between 3rd and 4th in town, how can keeping the o/d off and preventing that hurt your transmission? I have been told by mopar mechanics and other tranny mechanics that I am doing the wise thing. The less shifting the cooler your fluid stays and overheating a tranny is a cause of failure. But you need to do what you feel is best. Personally, having a truck w/an 8 banger and the weight warrants keeping it off. If I wanted an econobox, I would have bought a honda civic.

The o/d is a big point of failure in these trannys from what I understand. I have a 73 Charge w/a 727 and it works perfectly and it is a 3 speed. I hear that the tranny's in the RAms are the 727 w/overdrive. I could be wrong. But being that the car is 33 years old now and the tranny is original never rebuilt, says something for 3 speeds. Not an expert here. Just been my experience.