Pulley size is now a spec
 

Check it out, pulley sizes are now part of the specs on the supercharged Mustangs.

http://www.nhra.net/tech_specs/engine/blueprints/FORD-08.rtf

Re: Pulley size is now a spec
 

More important what DIA HAVE THEY BEEN RUNING AND WHAT DIA WERE THE RECORDS SET WITH GONE THRU TECH WITH?? LOOKS TO ME AS NHRA BOY'S DROPPED THE BALL BIG TIME N THIS ONE. The 57 fords had their dia llisted and as I remeber the Stick Shift was different than Auto had more Boost.

Re: Pulley size is now a spec
 

Also important to note is OEM pulley's only! No aftermarket! No playing with Belt and groove widths.

Bill

Re: Pulley size is now a spec
 

exactly right Bill, it should also state that the tensioners must be OEM as well

Re: Pulley size is now a spec
 

Why should the tensioner have to be OEM?

Re: Pulley size is now a spec
 

the OEM tensioner is spring loaded. Metco and others make tensioners that are positive acting, and act on a different place on the belt thus increasing boost by eliminating any slippage. The tensioner should at minimum have to be of OEM type (spring loaded) and should be in the stock location

Re: Pulley size is now a spec
 

Know thy enemy! I assume you would make NHRA aware of this?

Re: Pulley size is now a spec
 

Oh puulease! Then I'll run a belt soaked in belt dressing that has zero slip.


Man the hating is so obvious!

I wish obama motors and fiat would hurry up and field their pony cars........

Re: Pulley size is now a spec
 

there is no "hating", i just know what the supercharged mod motors are capable of. I do applaud NHRA for specifying the pulleys finally.

Re: Pulley size is now a spec
 

Chad,
The pulley spec has always been there, just not published. However, I do not know if they were checking them.

Bill

Re: Pulley size is now a spec
 

Hate.....thats another story but its tough enough dealing with fuel injected cars in the same class but SUPERCHARGED should be in a class by its self just like AFX was. NHRA has a can of worms on their hands and no one in those classes have a chance against them least they break or red light.

Re: Pulley size is now a spec
 

Back at the beginning of the year I asked an NHRA divisional tech guy if they had a spec for it, and i was told that Glendora may, but they did not have it in the field. Obviously i have know way of verifying this.

Re: Pulley size is now a spec
 

Are you running OEM valve spring seat pressure? Becuase if you are allowed to change your valve springs to prevent valve float you'll make more power and we can't have that.

Re: Pulley size is now a spec
 

apples and oranges

if the factory tensioner is spring loaded, so should whatever tensioner that is on it. otherwise its kinda like putting solid roller lifters on a hyd roller cam

Re: Pulley size is now a spec
 

But you first said the requirement should be the OEM tensioner be required. Now you say it should be a spring type tensioner if OEM is a spring type - this is a more rational request.

Re: Pulley size is now a spec
 

Ford Racing knew the stock supercharger pulley on the cobra jet was going to be a issue and this is what they are going to do:
2007 cobra jet has a 2.3L eaton supercharger
2010 cobra jet has a 3.4L whipple supercharger and this supercharger is bad *** and will move a ton of air!

Re: Pulley size is now a spec
 

That is debatable!

Re: Pulley size is now a spec
 

I have a 2007 shelbygt500 street car and just removed the 2.3L ford racing tvs supercharger and replaced it with a 3.4L whipple supercharger and 64mm whipple throttle body.Take my word,this supercharger is bad ***!

Re: Pulley size is now a spec
 

My point Dave is along the lines that you increased the supercharger size almost 50% - did you increase HP by 50%? Don't think so. The Whipple screws are not as efficient as the TVS, they have to be much larger to realize the airflow and HP increases like you have seen.

Re: Pulley size is now a spec
 

The 2010 CJ will be SS Only

Re: Pulley size is now a spec
 

The 2010 CJ should be introduced soon, however the cars are available with multiple engine and transmission options including a Super Stock version. More info on the Stocker combos along with body in white kits should be available in Vegas at the Thursday nite Ford meeting (Tasca tent) and again at SEMA.

Re: Pulley size is now a spec
 

No it did not increase my HP by 50% but I did make 733 RWHP on pump gas with a 3.25 supercharger pulley and 72# fuel injectors.

Re: Pulley size is now a spec
 

That's bad ***.......