I'm currently running a 3" pulley from SOS and was about to call Reichard Racing to get their notched anti-slip pulley. I can order a 2.8" or modify my 3" pulley I have now.

I searched and found 1 or 2 people running the 2.8" pulley. I have an AP2 and will be spinning the 1200 blower to 57750 RPM, which exceeds the max rating of 52000 Paxton advertises. For reference, at 7744 engine RPM I will be hitting the 52000 RPM Paxton threshold.

Just wanted to hear from people who are over-spinning their blower using the 2.8" and if there has been any reliability issues.

thanks

 

I custom modded a 2.7" pulley, but it was for a nv1000. Nice having that extra low/mid trq. Never got a chance to test it fully on dyno before my motor took a dump for still unknown reasons.

 

I have yet to hear of any blowers fail from over spinning with a pulley that small. My old N1220SL, it grenaded from a 3.0in pulley, the impeller seal was leaking. But the seal may have failed from the metal debris floating around inside the blower...?

How about you do it anyway and let me know how it goes. haha

 

If I spin the blower to 57750 (using 2.8" pulley @ 8600RPM), that's only a 1.11% over-rev.

Doesn't sound too bad if I put it that way


How much extra boost will I gain in the midrange if I go with 2.8 vs. 3.0? Is it really that significant? Maybe +1 psi across the RPM band?

 

You mean 1.11x or 11% greater with a 2.8. If you are not constantly above the threshold, the small gains down low might just be worth it.

If you are constantly in the high rpm range, that might be a concern for durability.

 

1.11 times over-rev (which is 57750/52000). And like you mentioned, this only occurs on higher RPMS. In this case >7744 RPM is where you cross the 52,000 threshold.

I'm leaning more towards making the 2.8" purchase

 

Does anyone know which belt to use for a 2.8" pulley?

 

Gatorback 4060390
And I have no issues running my 2.8" pulley. I went from belt slipping all the time at 18-19psi to never slipping at 22psi per my aem boost gauge.

Sent from my HTC PH39100 using Tapatalk 2

 

Thank you! I'm already running that belt size on my 3", so that's good

I ended up purchasing a steel 2.8" pulley from ASP Racing. The guys at Reichard Racing never pick up the phone (which seems to be the trend according to other forum reviews)

 

hopefully it doesn't slip. And thats weird about Reichard Racing as I had no issues the two times I called.