[Metalmania82]

Hi everyone. New to this forum and new to the V2 game and hoping to get some clarification on something.

My 2009 auto sedan was pretty heavily modded by the PO, all the usual mods it looks like and all name brand. Got it looked at and over by JWT and got a fresh tune put on and the car is 10x better afterwards.

My question: is it possible and or okay to swap the upper pulley from my current 2.55 down to a 2.45 or 2.4 while keeping the lower stock? The PO installed a cam but kept the factory pulley. I'd like to get a little more power and more supercharger whine but not have to deal with the lower if I don't have to.

Thanks in advance!

 

[Karch]

You’ll need a new tune and perhaps injectors.


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[Metalmania82]

You’ll need a new tune and perhaps injectors.


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I currently have ID1050x injectors, would those suffice?

 

[db-guru]

I currently have ID1050x injectors, would those suffice?

Almost for sure, but it depends on all your mods. Ask your tuner what your IDC (Injector Duty Cycle) was after the tune.

 

[Karch]

1050’s are fine on gasoline


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[papi]

You’ll only gain about 1 psi going from 2.55 to 2.45.

 

[Metalmania82]

What would the biggest difference be between going to a 2.45 or 2.40? Does the 2.4 require more mods to go along with it?

 

[Karch]

Virtually no difference.

Imo, changing the upper pulley at this point isn’t worthwhile. Period.

You are better off using that money for future tires, as getting the best tire is probably the most overlooked mod.

So many people, especially those newer owners, tend to throw the most money at gaining power and skimp on tires and brakes.

Just an observation after reading tens of thousands of posts over 10+ years.

But, actually, more like 25 years since it’s not a Cadillac thing.


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[Metalmania82]

Virtually no difference.

Imo, changing the upper pulley at this point isn’t worthwhile. Period.

You are better off using that money for future tires, as getting the best tire is probably the most overlooked mod.

So many people, especially those newer owners, tend to throw the most money at gaining power and skimp on tires and brakes.

Just an observation after reading tens of thousands of posts over 10+ years.

But, actually, more like 25 years since it’s not a Cadillac thing.


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The dealer I bought it from had new Conti Extreme Contacts installed before delivery

 

[Karch]

Ok, run those, save your money for a future upgrade or something else, imo.

Maybe paint correction and ceramic coat.

An upper pulley change is expensive because it means a retune, not worth it, IMO.


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[papi]

What fuel system upgrades do you have besides the 1050's?

 

[Metalmania82]

Ok, run those, save your money for a future upgrade or something else, imo.

Maybe paint correction and ceramic coat.

An upper pulley change is expensive because it means a retune, not worth it, IMO.


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Thank you for your information

What fuel system upgrades do you have besides the 1050's?

The rest of the fuel system is stock

 

[papi]

If you are or plan on running E85, your next mod should be new fuel pump system or an aux fuel pump.

 

[Metalmania82]

If you are or plan on running E85, your next mod should be new fuel pump system or an aux fuel pump.

No plans for E85 or the sort in the near future

 

[WookieNoiz]

Cutouts? Lowering it ? Cooling mods anything u can do to cool these beasts down helps alot

 

[Metalmania82]

Cutouts? Lowering it ? Cooling mods anything u can do to cool these beasts down helps alot

She came with headers, xpipe, cutouts, KW coilovers, Track Attack heat exchanger and Variram pump. And vented hood.

 

[Prime Time]

A full break down of your mod list would help. We will be able to inform/ give you options on where to throw $ to improve your current build. As most said, the drop in pulley size wouldn't be worth the coin. Unless you do an upper and lower pulley swap. Sizes, I am not sure. There is a thread on here where guys post their dyno numbers and have a list of their mods which helped them get to those numbers, including pulley sizes. Use the search function and you'll come across it. Congrats on the V!

 

[Metalmania82]

A full break down of your mod list would help. We will be able to inform/ give you options on where to throw $ to improve your current build. As most said, the drop in pulley size wouldn't be worth the coin. Unless you do an upper and lower pulley swap. Sizes, I am not sure. There is a thread on here where guys post their dyno numbers and have a list of their mods which helped them get to those numbers, including pulley sizes. Use the search function and you'll come across it. Congrats on the V!

Here is a list of the important ones:

Reinforced brick
90mm ported TB
Track Attack HX
Variram pump
ID1050x injectors
NGK plugs
TSP custom grind cam, valve springs, pushrods
2.55 Lingenfelter pulley and hub
TSP long tubes
X-pipe
E-cutouts
Airaid
KW coilovers
Vented hood

 

[Prime Time]

You can always add an expansion tank to add to your cooling mods. Trunk or engine bay. Its pretty cheap and you can do it yourself. I sure multiple venders on this forum have them and are ready to ship.

 

[Metalmania82]

You can always add an expansion tank to add to add to your cooling mods. Trunk or engine bay. Its pretty cheap and you can do it yourself. I sure multiple venders on this forum have them and are ready to ship.

I planned on adding that over the winter while the car sits. I really just wanted to see if I could add a smaller upper and keep the lower but it seems like the responses I'm getting from everyone is mixed 50/50.