Originally Posted by
Red16
Currently I have a turbocharged Kawasaki ZX10R engine, Tial 38mm external wastegate with an 8psi spring and a manual boost controller to give me my upper boost setting, low boost 8psi and high boost 15psi.
During a recent mapping session we found that the boost controller wasn't controlling boost as it should, so I'm planning on fitting an electronic boost controller (particularly like the look of the Turbosmart E-Boost Street) and a smaller wastegate spring.
Doing the above would give me 3 boost settings...
1) 4psi from the wastegate spring
2) 8psi low boost using the controller
3) 15psi high boost using the controller
Can you go too small with the wastegate spring in comparison to the maximum boost you wish to run? is there an ideal or maximum ratio between the two? or does it make no difference?
Depends on the ability of the EBC and whether or not the physical w/g is correctly sized, or wrongly sized.
If they are at extremes, then smooth control is going to get harder
38mm w/g will be fairly large unless it's making a fair bit of power, but will also depend on turbo etc.
But 4psi to 15psi with a good EBC shouldnt pose any real problems.