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-   -   Pulley size is now a spec (https://classracer.com/classforum/showthread.php?t=21240)

Bob Pagano 10-23-2009 12:44 PM
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.

Chad Rhodes 10-23-2009 12:50 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by Bill Grubbs (Post 147536)
Chad,
The pulley spec has always been there, just not published. However, I do not know if they were checking them.

Bill
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.

Tim Kish 10-23-2009 03:24 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by Chad Rhodes (Post 147513)
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
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.

Chad Rhodes 10-23-2009 04:05 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by Tim Kish (Post 147589)
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.
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

Tim Kish 10-23-2009 05:25 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by Chad Rhodes (Post 147592)
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
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.

davidhuff 10-23-2009 05:30 PM
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!

Tim Kish 10-23-2009 05:32 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by davidhuff (Post 147603)
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!
That is debatable!

davidhuff 10-23-2009 05:50 PM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by Tim Kish (Post 147604)
That is debatable!
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 ***!

Tim Kish 10-26-2009 07:46 AM
Re: Pulley size is now a spec
 
Quote:
Originally Posted by davidhuff (Post 147610)
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 ***!
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.

Bob Pagano 10-26-2009 08:19 AM
Re: Pulley size is now a spec
 
The 2010 CJ will be SS Only


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