Possible Pulley Problem

[Timspony]

74" for sure?

Below is a quick reference guide:

• Stock Upper Pulley-75.0"
• 3.00 Upper Pulley-74.5"
• 2.93 Upper Pulley-74.0"
• 2.80 Upper Pulley-73.5"

Link to Cobra Bob's belt guide: http://www.stangshiftergaskets.com/belt_selection_guide.htm

2.80" or 2.76" w/AUX. = 74"

 

[SubZero00GT]

Last question .. Should i do upper or lower pulleys? Whats the major difference?

 

[SubZero00GT]

So i only see two aftermarket pulleys? One's 90 and one's 100 The belt thats currently on there is a Napa 25-080730

 

[Timspony]

Last question .. Should i do upper or lower pulleys? Whats the major difference?

...I would do only the upper pulley only...unless you get the Eaton ported!

2.76" or 2.8" pulley will pretty much max. out the boost levels with a stock Eaton...+ once your around 500 rwhp, you'll need to upgrade and add at least a BAP...injectors & MAF would be next...where do you stop!

 

[SubZero00GT]

So i only see two aftermarket pulleys? One's 90 and one's 100 The belt thats currently on there is a Napa 25-080730

I called napa and according to them the Napa 25-080730 belt is a 73.5" belt.. So if i went with a 2.80" pulley i would go with..?

 

[Timspony]

WitTh 1-Piece Idler (100mm)Pulley Size
Belt Size
Gates Micro-V Part #
Gatorback Poly-V Part #
3.65 (stock)
75.1”
K080751
4080750
3.40
75"
K080750
4080750
3.20
74.5" or 75"
K080745 or K080750
4080745 or 4080750
3.10
74" or 74.5"
K080740 or K080745
4080740 or 4080745
3.00
74" or 74.5"
K080740 or K080745
4080740 or 4080745
2.95
74” or 74.5"
K080740 or K080745
4080740 or 4080745
2.93
74” or 74.5"
K080740 or K080745
4080740 or 4080745
2.90
74" or 74.5"
K080740 or K080745
4080740 or 4080745
2.80
74"
K080740
4080740
2.76
74"
K080740
4080740
2.75
74"
K080740
4080740


This is direct from Cobra Bob's belt guide (link above) WITH Aux. 90 or 100mm Pulley ....I'm not sure the NAPA guy is correct ^^^^...74" belt ends in 740 ....74.5 belt ends in 745, etc.

 

[SubZero00GT]

Haha those guys are clueless.. I called two other stores and now there telling me it's a 22 inch belt..

 

[Timspony]

Haha those guys are clueless.. I called two other stores and now there telling me it's a 22 inch belt..

:nono: ^^^^...If yiu get the Aux pulley like I have in my pic (90 mm), you'll need a 74" belt!

 

[dsblk93gt]

Either Diablo or SCT is fine, makes no difference in the brand it's the person tuning the car. PPRV delete like stated above is for the hesitation between shifts, my friend had to do that on his ProCharged 99 Cobra actually.

Still running the stock MAF on the car?

Thats not a bad price from Kennedy's really where are you located?

 

[SubZero00GT]

Yeah, i'm still running the stock MAF.. I'm in Rochester, NY. Kennedys is a little under an hour away from my house.

 

[SubZero00GT]

:nono: ^^^^...If yiu get the Aux pulley like I have in my pic (90 mm), you'll need a 74" belt!

So i have a problem.. I don't have an Aux idler.. Here's a picture of mine.. One pulley is 90mm and the other is 100mm I'm so lost.

 

[SubZero00GT]

Was going to order tonight so it'll be here by the end of the week but i can't figure out what belt to get or wtf pulley's i have.. ugh..

 

[SubZero00GT]

Well i ordered the pulley.. I'll just get the belt from one of the local stores but i need to know what size.. Would that still be a 74"?

 

[Timspony]

K080740 is a 74" belt...looks like you have an aftermarket blower pulley!

 

[SubZero00GT]

Ughh My cobra is being a pain in my a$$.. So this morning around 6am i was headed into work and guess what happened.. I hear a bang pop pop bang and see something fly out from under my car.. Sure enough.. My lower pulley broke.. I'm having such bad luck.

Good news though.. I ordered my 2.81 pulley last night and yeah tim :nono: i have a 3.1" steeda pulley on there now.

What should i replace that lower pulley with?

 

[Timspony]

That's an "idler" that broke ....stockers cheap....I installed Metco's on mine!

 

[SubZero00GT]

So is that something normal? They just break?

 

[Timspony]

So is that something normal? They just break?

Normal! ...easy fix!

 

[SubZero00GT]

Glad my title makes sense finally..

Oh and Btw.. Could this pulley have been the cause of the original problem at all or is this just like another random cobra advantage..

 

[Timspony]

Glad my title makes sense finally..

Oh and Btw.. Could this pulley have been the cause of the original problem at all or is this just like another random cobra advantage..

With the plugs? NO! ....The idler really does nothing but make the belt tighter.....