wastegate spring question?
01-14-07, 11:35 AM
#1
wastegate spring question?
does any one have a chart that brakes down the wastegate spring # for the boost pressure you want to runn.
for example:
if i runn my turbo at 10 lbs street and 17 lbs track what wastegate spring should i need to cover both settings ect. -runing a tial 38mm
for example:
if i runn my turbo at 10 lbs street and 17 lbs track what wastegate spring should i need to cover both settings ect. -runing a tial 38mm
01-14-07, 11:46 AM
#2
its pretty straightforward... essentially you want whatever your lowest pressure is to be able to push in the actuator enough to open the wastegate (say, 1.5 inches).
So say you want 10 psi (psi = lbs/in^2), and the surface area of the wastegate is 5 in^2 (just for example, (pi * 38 mm^2)/4, convert to inches^2 in your case, assuming that the 38 mm is diameter).
Multiply the two above (take care with the units!) then 10 lbs/in^2 * 5 in^2 is 50 lbs. Since you want this boost to be able to move the actuator 1.5 inches, the spring rate you need is 50 lbs/1.5 inch, or 33.33 lbs/inch. If you need to round it, round downward (since im assuming you're using a boost controller). Choose the spring so that the calculated force will compress the spring however far it needs to open the wastegate.
do this all with your own numbers, the example i did was just for demonstration
So say you want 10 psi (psi = lbs/in^2), and the surface area of the wastegate is 5 in^2 (just for example, (pi * 38 mm^2)/4, convert to inches^2 in your case, assuming that the 38 mm is diameter).
Multiply the two above (take care with the units!) then 10 lbs/in^2 * 5 in^2 is 50 lbs. Since you want this boost to be able to move the actuator 1.5 inches, the spring rate you need is 50 lbs/1.5 inch, or 33.33 lbs/inch. If you need to round it, round downward (since im assuming you're using a boost controller). Choose the spring so that the calculated force will compress the spring however far it needs to open the wastegate.
do this all with your own numbers, the example i did was just for demonstration
01-14-07, 01:36 PM
#3
Originally Posted by toplessFC3Sman
its pretty straightforward... essentially you want whatever your lowest pressure is to be able to push in the actuator enough to open the wastegate (say, 1.5 inches).
So say you want 10 psi (psi = lbs/in^2), and the surface area of the wastegate is 5 in^2 (just for example, (pi * 38 mm^2)/4, convert to inches^2 in your case, assuming that the 38 mm is diameter).
Multiply the two above (take care with the units!) then 10 lbs/in^2 * 5 in^2 is 50 lbs. Since you want this boost to be able to move the actuator 1.5 inches, the spring rate you need is 50 lbs/1.5 inch, or 33.33 lbs/inch. If you need to round it, round downward (since im assuming you're using a boost controller). Choose the spring so that the calculated force will compress the spring however far it needs to open the wastegate.
do this all with your own numbers, the example i did was just for demonstration
So say you want 10 psi (psi = lbs/in^2), and the surface area of the wastegate is 5 in^2 (just for example, (pi * 38 mm^2)/4, convert to inches^2 in your case, assuming that the 38 mm is diameter).
Multiply the two above (take care with the units!) then 10 lbs/in^2 * 5 in^2 is 50 lbs. Since you want this boost to be able to move the actuator 1.5 inches, the spring rate you need is 50 lbs/1.5 inch, or 33.33 lbs/inch. If you need to round it, round downward (since im assuming you're using a boost controller). Choose the spring so that the calculated force will compress the spring however far it needs to open the wastegate.
do this all with your own numbers, the example i did was just for demonstration
01-14-07, 01:49 PM
#4
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10 pound spring is good up to 20 to 21 psi...
so ur good .....
meaning u can double boost
10 pds spring max 20psi
15pds spring max 30psi
so times it would spike pass settin but will fall back down to ...
like turning boost up to 20 psi on a 10 pds spring would sometime spike higher to 25 to 23 psi
but will go back down to 20psi.....
so ur good .....
meaning u can double boost
10 pds spring max 20psi
15pds spring max 30psi
so times it would spike pass settin but will fall back down to ...
like turning boost up to 20 psi on a 10 pds spring would sometime spike higher to 25 to 23 psi
but will go back down to 20psi.....
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