1. ## supercharger diameter question

i am wondering what is the difference between a stock 215 supercharger (impeller diameter) and an x-charger. can a stock 215 charger become a x-charger? what diameter is a rude charger. i am looking around an i can find 137, 140 and 145mm sizes. what fits what?

2. 215 charger is 127mm
x charger is 137mm
not sure about the later model rudes but rude 1 is 140mm

3. Stock 215 = 127mm Drop in wheels to suit

Stock 255 = 137mm Drop in wheels to suit

1Rude = 140mm

B-kit = 140mm

2rude = 140mm

ET68-140 = 140mm

ET70145 = 145mm

4. Sorry due to you have a lot of

5. New Gen C-kit = 140mm

Old Gen C-kit = 142mm

6. Thanks. It would be good to have a summery of psi or bar of each at8100 rpm. Thank you

7. Stock (using stock air intake)
185hp = 6-6.5 psi @ 7600
215hp = 7-7.5 psi @ 8100
255hp = 9.8-10psi @ 8100

Riva
Gen1 = 8-8.5 psi @ 8100, 9 psi @ 8500
Gen2 = 9 psi @ 8100, 10 psi @ 8500 (original Green Wheel)
Pro (S3) = 9.5-10.5 psi @ 8100, 11 psi @8500

Les Cooke
A kit = 9.5-10.5 psi @ 8100
B kit = 13-13.5 psi @ 8100, 14-14.5 @ 8500
C kit = 14.5-15 psi @ 8100, 16 psi @ 8500

RUDE
Rude 1 = 11.5-12 psi @ 8100, 13-13.5 psi @ 8500
2 Rude = 13-13.5 @ 8100, 14.5-15.5 @ 8500
3 Rude = 15 psi @ 8100, 17-18 psi @ 8500

R&D
C1 = 9 psi @ 8100, 10 psi @ 8500
C2 = 9 psi @ 8100, 10 psi @ 8500 (more airflow than C1)
C3 = 9.5-10 psi @ 8100, 10.5-11 psi @ 8500
C5 = 10-10.5 psi @ 8100, 11-11.5 psi @ 8500

ET
No consistant numbers reported, but information can be found.

8. Ery good!!!! Thank you

9. as it seems the best drop-in for a 215 charger is s3 charger at 10.5 psi at 8100rpm
For 255 charger its the et 137xle with a claimed 13psi at 8100rpm
anything after that is just machining the rear housing at 140mm and the best seems to be the 2rude upgrade at 13.5psi. anything else and you have to buy a complete charger

10. What about rotax racing high boost wheel for offshore 137 mm and cc 140mm? Do you know psi?