scoooby slayer

iTrader: (4)

hi ive got a saph running greens and a t3. it was boosting to 28 and holding 26 when i bought it. its been stood for a year while i repaired it and i cant get the boost to hold. ive used a new collins 31 actuator and it boosts to 24 and holds 21 which is how i want it but when it reaches about 4500 rpm the boost starts dropping and falls to 15 at 5500 rpm. ive tryed another amal valve but it would only boost to 16 psi with that with the actuator adjusted right up. i just cant figure it out the more the engine revs the less boost ive got. if anyones got any ideas it would be much appreciated.

CosKev3

Thought turbos all do this

Mine peaks at 35psi,holds 28 psi,and is at 22psi at limiter

Thats a T34

DAN P

iTrader: (1)

as above a little t3 should drop boost about 5 ? to a safer limit i no my m8s used to hit 32 hold 28 then drop to 22 at limiter like kevs

scoooby slayer

iTrader: (4)

cheers for the info, i had a 500 bhp 3 door running 8 greens and a t4 running 28 psi and it held the boost right up to 175 mph. i also had a 350 bhp saff and that held 24 psi right up to 165 mph and i know thats true as i done it. thanks for the info though people if anyone has any ideas please let me know

mazsco

a t4 will hold your boost till redline,well with a little tailoff but a t3 wont do anywhere near that im afraid

scoooby slayer

iTrader: (4)

yeah i see what you mean as its smaller it cant phsically deliver the mass of air, this is the first cossie ive had with a t3 maybe i get a t35 then