Upper Only vs. Lower Only

[YellowCobra04]

I was given a Metco 6# lower pulley by one of my friends. What kind of difference in HP/TQ number will I see between a 2.8 upper only vs. a lower pulley pushing the same amount of boost? I have always heard that a lower pulley will produce more torque then a upper.

Has anyone tried this set up, and what kind of number did you get?

Will the 6# pulley it came with give me the same boost as a 2.8 pulley or do I need to order a different size.

 

[SLEEPERSTATUS]

get a posi race port and run a upper and the lower

 

[Fat-cat]

For some reason people seem to see more tq gains out of a lower than the upper but pretty similar HP gains. either way is great to make power.

 

[YellowCobra04]

get a posi race port and run a upper and the lower

I would love to get my blower ported, but I'm in college right now so money is tight for me. I hope to port it next summer when I get an internship and have a little more spare money.

So for right now I am just going to do a pulley for now.

 

[SLEEPERSTATUS]

I would love to get my blower ported, but I'm in college right now so money is tight for me. I hope to port it next summer when I get an internship and have a little more spare money.

So for right now I am just going to do a pulley for now.

ok then do the upper but dont forget you will need a tune aswell

 

[96stanggt]

Boost for boost and blower rpm for blower rpm you shouldn't see any difference. If budget is your concern then go with the upper.

 

[BlackBeauty44]

i just got all my goodies in the mail what gains will i see with a 2.8 upper and my current supporting mods??

 

[YellowCobra04]

Boost for boost and blower rpm for blower rpm you shouldn't see any difference. If budget is your concern then go with the upper.

I am going with a lower only because it was given to me. In also thought it would be a little different to have a stock pulley and a 6# lower. It will look stock till they see and hear me blow by them. :burnout:

 

[96stanggt]

I am going with a lower only because it was given to me. In also thought it would be a little different to have a stock pulley and a 6# lower. It will look stock till they see and hear me blow by them. :burnout:

Ah hell I barely read your original post! :bash: If you already have the 6lb lower then go for it, install is more of a pia but you'll like it.

 

[LuDamiKE81]

The lower will do especially for free.

 

[03COBRA-88]

What kind of billetflow pullies can you run with a 6lb lower only?

 

[03COBRA-88]

Also what kinda of upper pulley can you run without porting the blower?

 

[Pock]

Also what kinda of upper pulley can you run without porting the blower?

I don't think you'll want to put upper on if you are going to run that lower. Once it's ported it will be able to handle a good upper lower combo.

 

[Black Talon]

Also what kinda of upper pulley can you run without porting the blower?

You can run a 2.93 upper and #4 lower but heat soak will be a issue.

 

[03COBRA-88]

Wouldn't I be able to run a 3.1 upper and 6lb lower with a good tune without porting the blower? Sorry for the threadjack.

 

[96stanggt]

Wouldn't I be able to run a 3.1 upper and 6lb lower with a good tune without porting the blower? Sorry for the threadjack.

Yes, that's about the same blower rpms as the 2.93/4lb combo. You can spin it as hard as you want provided you have enough fuel and watch the temps.

 

[03COBRA-88]

Yes, that's about the same blower rpms as the 2.93/4lb combo. You can spin it as hard as you want provided you have enough fuel and watch the temps.

Thanks for the info

 

[hmbsvt]

i went with 2.7 upper an its not looking to good it almost seems like its spinning to much an like bogging..... HELP!!!!!!!

 

[cobracide]

i went with 2.7 upper an its not looking to good it almost seems like its spinning to much an like bogging..... HELP!!!!!!!

Datalog so we can help.

 

[03COBRA-88]

Talked to a tuner today and he said just to leave the car with the 6lb lower only. If I were to add a 3.1 he said after about 4800 rpms the car wouldn't make any more power.