This is topic 03 cobra pulley change? in forum Tech Talk at Northern California Ford Owners  .


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Posted by johnson50 (Member # 4608) on :
 
is there any other thing i have to do if i change from the stock supercharger(only) pulley to like a 2.93 or lower? thanks
 
Posted by TRIXSNK (Member # 2844) on :
 
On my old Cobra i added a 100mm aux idler to prevent slip but i had a 2.76 pulley.

I went with a gates 74.5 belt as well.

Oh ya a tune might be a good idea as they say a 3.10 should be the smallest w/o a tune.

Either way gotta get that A/F checked after [burnout]
 
Posted by 91 5.0 5speed (Member # 1867) on :
 
quote:
Originally posted by johnson50:
is there any other thing i have to do if i change from the stock supercharger(only) pulley to like a 2.93 or lower? thanks
What color is your Cobra? is it red?
 
Posted by 03SVT (Member # 5987) on :
 
If you need the pulley removal tool I will let you borrow it PM if you need help I am glad to as long as you have the tools.
 
Posted by johnson50 (Member # 4608) on :
 
I have a black 03. and TRIXSNK, when you say A/F, you mean air/fuel mixture right? lets say i put a 2.95 pulley on and no other idle, etc. will i mess something up or no. and will i need another size belt for a 2.95?
 
Posted by johnson50 (Member # 4608) on :
 
and thanks 03SVT but i have the pulley puller covered.
 
Posted by 91 5.0 5speed (Member # 1867) on :
 
quote:
Originally posted by johnson50:
I have a black 03. and TRIXSNK, when you say A/F, you mean air/fuel mixture right? lets say i put a 2.95 pulley on and no other idle, etc. will i mess something up or no. and will i need another size belt for a 2.95?
For best results and to possibly save your motor get a tune when you do the pulley swap. You will also need a different size belt. I think I may have seen your car at 7 flags in Fairfield. You reved at my Cobra while I was at the car wash. I have a redfire 04 if that was you. I think you need a gates 74.5 belt but I could be wrong. I will check to see what is on my car and let you know
 
Posted by johnson50 (Member # 4608) on :
 
i may have been that person on north texas. but i forget. i do live around that area. anyone know the number to JeffS of santa clara.
 
Posted by Jeff S (Member # 371) on :
 
quote:
Originally posted by johnson50:
i may have been that person on north texas. but i forget. i do live around that area. anyone know the number to JeffS of santa clara.
408-623-2373 [Big Grin]
 
Posted by johnson50 (Member # 4608) on :
 
thanks for the # and does anyone know the stock supercharger pulley size on a 03.
 
Posted by 91 5.0 5speed (Member # 1867) on :
 
quote:
Originally posted by johnson50:
thanks for the # and does anyone know the stock supercharger pulley size on a 03.
stok is 3.65
 
Posted by johnson50 (Member # 4608) on :
 
thanks and like i read earlier, i can get a 3.10 pulley and dont have to tune it. im just tryin to put the smallest pulley on i could and do nothing else. thanks [Smile]
 
Posted by Jeff S (Member # 371) on :
 
quote:
Originally posted by johnson50:
thanks and like i read earlier, i can get a 3.10 pulley and dont have to tune it. im just tryin to put the smallest pulley on i could and do nothing else. thanks [Smile]
Changing the pulley to ANY size without a tune is a VERY bad idea and not give anywere close to optimal performance and safety.
 
Posted by TRIXSNK (Member # 2844) on :
 
quote:
Originally posted by Jeff S:
quote:
Originally posted by johnson50:
thanks and like i read earlier, i can get a 3.10 pulley and dont have to tune it. im just tryin to put the smallest pulley on i could and do nothing else. thanks [Smile]
Changing the pulley to ANY size without a tune is a VERY bad idea and not give anywere close to optimal performance and safety.
Sorry i should have clarified to not lead anyone in the wrong direction [Frown] .

When i said "they" i meant what others have tried not saying you should attempt the same.

Just like Jeff said with any pulley change it's imperative to get it on a dyno, tuned, and that will usually come with the A/F ratio.
 




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