Benefits Of Lower Pulley Swap?

[Wease]

In the near future, I'm going to go with the 4 idler pulley swap along with a 2.76. I've read that doing that, along with a 4# lower pulley, can really help your numbers out as well. Why is that? What is the HP/TQ difference in doing that lower pulley swap along with the others? As opposed to just the others? :??:

 

[1bad_stang]

I've got a 2.93 w/ a 4# lower and I see 16-17# of boost. I made 483hp/530#tq.:rockon: You will definately need an aftermarket heat exchanger and tune!! If you go w/ the 2.76 and 4# lower you will be over spinning the stock UNPORTED eaton.

 

[JMD0346]

Mo pulley make mo powa!

 

[Wease]

I've got a 2.93 w/ a 4# lower and I see 16-17# of boost. I made 483hp/530#tq.:rockon: If you go w/ the 2.76 and 4# lower you will be over spinning the stock UNPORTED eaton. You will definately need an aftermarket heat exchanger and tune!!

OK, so 2.93 and the 4# lower seems to be the popular combo.

BTW, those are some killer numbers for an unported Eaton...

 

[Zinc03Cobra]

yup! torque is what I saw the most beneficial gain.

 

[Narcosynthesis]

Benefits is saying Oh shit and then a huge smile after you floor it in third.

 

[blackvenom77]

In the near future, I'm going to go with the 4 idler pulley swap along with a 2.76. I've read that doing that, along with a 4# lower pulley, can really help your numbers out as well. Why is that? What is the HP/TQ difference in doing that lower pulley swap along with the others? As opposed to just the others? :??:

On a heaton (non-port) I'd just do a 2.76 and idlers and call it good. I ran this combo for a long time and it was great.
For a heaton (ported) the 2.93 - 4# is the sweet spot. A larger lower has more rotating mass which helps out torque. Also increases belt wrap which is a good thing.
Don't do a 2.76 and a 4#!! You will make too much heat and drastly reduce the life of your blower. You have to remember you are forcing something to do what it wasn't designed to do. (JMO):-D

 

[Wease]

On a heaton (non-port) I'd just do a 2.76 and idlers and call it good. I ran this combo for a long time and it was great.
For a heaton (ported) the 2.93 - 4# is the sweet spot. A larger lower has more rotating mass which helps out torque. Also increases belt wrap which is a good thing.
Don't do a 2.76 and a 4#!! You will make too much heat and drastly reduce the life of your blower. You have to remember you are forcing something to do what it wasn't designed to do. (JMO):-D

Excellent info, thank-you very much. I'm not sure if I'll be doing the porting anytime soon, or just save my money for a real blower swap. Thanks again for that reply...

 

[viperstang]

hi hate to jump in on your post but i have a ported eaton 2.8 and a 4lb lower .I am confused because i am not makeing the numbers i should be. I made 465 and 533# torque. I have seen a few ppl use the same combo and they made anywhere from 510 - 550. can anyone tell me if i am crazy or should i find someone new to tune my car?

 

[slo-poc]

What mods have you done to your car?

 

[AllVenom]

Personally, I like the 2.93/6lb option... More belt wrap and much better seat of the pants feel! Eatons are cheap, who cares if you overspin it. Nothing lasts forever, mine as well enjoy it while you can!