Smaller pulley but very short coming results???

[Cory S]

About 11psi

You’re not making 778 @ 11psi. With a turbo(s) and a manual yes.

You were probably closer to 12-12.5psi on the stock pulley.

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[Andy13186]

Do you have any before/after 60-130 times in the same DA after the change?

 

[Andy13186]

You’re not making 778 @ 11psi. With a turbo(s) and a manual yes.

You were probably closer to 12-12.5psi on the stock pulley.

I do think 778 rwhp on a gen 3 motor and 10r80 on e85 is pretty normal because of the higher compression. Heres my dyno on 3.875 pulley whipple

 

[Cory S]

I do think 778 rwhp on a gen 3 motor and 10r80 on e85 is pretty normal because of the higher compression. Heres my dyno on 3.875 pulley whipple

And that’s 11psi?

 

[Andy13186]

And that’s 11psi?

Probably 10 psi with no cats 1.6 air load in hot weather, 1.72 in far negative DA

 

[Cory S]

Probably 10 psi with no cats 1.6 air load in hot weather, 1.72 in far negative DA

She’s healthy! Any 1320 or 60-130’s?

 

[Andy13186]

She’s healthy! Any 1320 or 60-130’s?

Couple 60-130s there Ive trapped over 145 in the 1/4 with a terrible start on the street because of no traction

 

[casper cobra]

how is your fuel and spark in both pulley (old and new) this should clear the confusion

 

[HKusp]

I think, at this point, all things being equal, and I know that's a stretch, but the O2's have to be the issue, if you are truly coming up that short.

 

[horsepower addiction]

your only about 80hp short and on a 8 rib griptec your not slipping. how much spark advance?

 

[andrewtac]

The ysi does best at or above max speed. So you might not see bigger power jumps until you get to 20+ psi. At least that is my understanding, maybe beefcake will chime in.

 

[Cory S]

The ysi does best at or above max speed. So you might not see bigger power jumps until you get to 20+ psi. At least that is my understanding, maybe beefcake will chime in.

My Si trim used to turns circles around my YSI at the same boost level. Bigger blower turning slower=laggy slow response. Once I asked 25psi from that YSI though, it was much happier and picked up 240whp.
I don’t know why people keep buying 1200+whp blowers and only run 9-13psi on the S550.

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