so tell me folks why does nobody go with the holley. i woudl guess price but is there a difference in performance?

 

The Holley might be manufactured straight out of a factory, as the Fastmans are bored out stock units, but they do the same thing. Pay twice as much money for the name if they do the same thing? No thanks.

 

I don't know from experience but I'm confident there is no performance difference between the two. You can take the saved money and put it tword another upgrade. Plus IIRC the stock unit is a holley.

 

Yep, you are correct, the stock unit is made by Holley.

 

installed my fastman 52mmtoday. nice upgrade.a definite improvement in the mid and higher rpms.
he does nice machining. and a very helpful guy too.i liked calling him and he said that he had to make it first. that just made me feel better everything was on a more personal level. plus the price is nice too.

 

I think the cheap price of The Fastman is what makes most people go with it.

 

The above flows for the factory throttle bodies designed by Chrysler and manufactured by Holley are from the USA Patent
and are 'sworn under oath to be true'

The numbers on graphs are not the mm sizes, but the number of the line that describes that throttle body in the patent.

Line 58 {correction} is the one for the 5.2/5.9 factory throttle body design
and since it has two bores
you need to double the CFM number
so that the stock Dodge 5.2/5.9 dual bore throttle body flows about
600 CFM

If you understand the graph
you understand that simply boring out the throttle body 'venturi'
... the smaller section....
does not increase flow at maximum opening
but does give a 'jumpy' feel to the throttle as you begin to open it.

Full Patent at

http://tinyurl.com/59ug6o

 

HankL,

Welcome back! I see by reading your link that plot line 50 is a straight bored 52mm. Plot line 52 is a 42mm bored TB and the others are various manipulations of the "nozzled" T design where they altered the taper and blade clearance. Am I reading that correctly?

 

that may be what the graph says but i disagree. i am a big sceptic on everything,but i am telling you that i could feel a difference after the install.

 

the 52mm on a 5.9 is an awesome upgrade... when I sold mine & went back to stock I started looking for something I did wrong (stock TB & stock rockers from the 1.7's and gibson shorties) after double checking I could not find any issue... just missing the parts & power.