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-   -   What size pulley for ysi (https://www.corvetteforum.com/forums/c6-forced-induction-nitrous/4197757-what-size-pulley-for-ysi.html)

_Wayne_ 10-09-2018 12:49 AM
What size pulley for ysi
 
Finally got my ysi ordered. My current set up is a forged 427, heads, cam, Ttrim blower, 3.1 pulley, 8” overdrive, 8 rib set up. I hit 780 on e85. My goal is 900+ with the ysi, my question is, what is the smallest sized pulley I can put on without belt slip or going flip drive or 10 rib. Should I stick with the 3.1 or could I do a 2.9 or smaller? Thanks!

ZincGT 10-09-2018 11:39 AM
I would recommend the 3" but idk how it will effect belt slip, I had a flip drive with 8 rib and never had an issue.

Unreal 10-09-2018 12:43 PM
YSI is a lot harder to spin than a t-trim, so I wouldn't be surprised if a 3.1 slips on just an 8 rib. I know I had issues in the 3.15 range with just 8 rib.

robert miller 10-09-2018 12:44 PM
Originally Posted by _Wayne_ (Post 1598126656)
Finally got my ysi ordered. My current set up is a forged 427, heads, cam, Ttrim blower, 3.1 pulley, 8” overdrive, 8 rib set up. I hit 780 on e85. My goal is 900+ with the ysi, my question is, what is the smallest sized pulley I can put on without belt slip or going flip drive or 10 rib. Should I stick with the 3.1 or could I do a 2.9 or smaller? Thanks!
If I had a 3.1 on the car now I would just do a 2.75 & overspin that puppy & really get the HP out of it. The YSI loves the 2.75 pulley on it but like you have said I would look at the 10 rib r the flip drive. On my c5 with the YSI on it I did the flip drive & it didn't slip at all. I also had a forged 402 motor & it made 1173 rwhp & that was with a auto trans & also on a mustang dyno. The YSI loves the 2.75 pulley man...

Unreal 10-09-2018 02:09 PM
Yes it does, but not with just an 8 rib. I run a 2.70 with 10 rib and direct drive, zero issues. With just an 8 rib 3.1 maybe pushing it.

gameover4 10-09-2018 02:15 PM
your going to need to go 10 rib or direct drive...

ZincGT 10-09-2018 07:01 PM
2.7 cut pulley on a 8 rib direct drive with 0 issues

ZR1-ab 10-09-2018 07:45 PM
to reach over 900 u going to need a 2.7" , flip drive and a 10 rib

_Wayne_ 10-09-2018 08:11 PM
Well looks like a direct drive is the way to go. Could I do 8 rib with a direct drive or is 10 rib pretty much a necessity?

ZincGT 10-09-2018 08:20 PM
Originally Posted by _Wayne_ (Post 1598131538)
Well looks like a direct drive is the way to go. Could I do 8 rib with a direct drive or is 10 rib pretty much a necessity?
8 rib and a 3.0 and you will be able to reach your goals. You can do 2.7 but it’s not necessary, I made 930 uncorrected in Denver with the 2.7 on e85

_Wayne_ 10-09-2018 08:31 PM
What was your drive setup? Also what engine do you have?

ZincGT 10-09-2018 08:34 PM
Originally Posted by _Wayne_ (Post 1598131666)
What was your drive setup? Also what engine do you have?
cartek flip drive, 402 with ls3 heads

realcanuk 10-09-2018 09:01 PM
Making 1000 on an 8 rib, flip drive, and 3.0 pulley. No belt slip.

gameover4 10-11-2018 08:06 AM
im running AA direct drive 2.85 8 rib no slip

_Wayne_ 10-11-2018 08:10 AM
So I’m thinking going with the carteck flip drive and a 2.8 or 2.7. Any opinions on the carteck vs the A&A or Ecs?

Unreal 10-11-2018 08:39 AM
A&A is WORLDs better for the flip drive. I've ran just about every setup. If you are going that far, might as well just do the 10 rib with flip. Cost difference is basically nothing at that point.

helga203 10-11-2018 01:26 PM
Originally Posted by gameover4 (Post 1598139904)
im running AA direct drive 2.85 8 rib no slip
Originally Posted by realcanuk (Post 1598131819)
Making 1000 on an 8 rib, flip drive, and 3.0 pulley. No belt slip.
Originally Posted by ZincGT (Post 1598131587)


8 rib and a 3.0 and you will be able to reach your goals. You can do 2.7 but it’s not necessary, I made 930 uncorrected in Denver with the 2.7 on e85
Originally Posted by ZincGT (Post 1598131117)
2.7 cut pulley on a 8 rib direct drive with 0 issues
What blower belts are you guys using???

realcanuk 10-11-2018 01:34 PM
Originally Posted by helga203 (Post 1598141707)
What blower belts are you guys using???
I'm running a gates HD green belt. Hasn't given me any issues at all. When it needs a change I may try an RPM belt. They were not out yet when I did my build.

Ant-Man 10-11-2018 02:00 PM
Direct drive 8 rib, 3.1" gates green belt making 20psi.. around 550hp but let's not talk about that.

gameover4 10-11-2018 04:17 PM
i ran green belts and they glazed over and began to squeak quickly. since then gone to rpm and will never run anything else


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