loosing boost

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garry goodall

Member +
if your using the standard actuator its normal to have boost drop up higher in the rpm as the spring is weak, to get round this you will need a HKS actuator. do a search for boost drop off and you should find loads of threads on this.
 
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J

jason_sureshot

Fresh Recruit
There is a quick and cheap way to get away from this problem however...

What Garry Goodall said is very true, these CT9's are so very old that in the year 2010, they become very weak, so you wont get more than 10psi past 5000RPM, if you are lucky you may get full boost up to 5800RPM, then it would just drop off really quickly..

The quick, easy and very cheap (almost free) solution to this would be ... get a SPRING...

yes a normal, regular, spring...on that is small and strong enough to hold the tension, you obviously have a BOOST gauge in your car i hope, so what you do is that you take the spring and you place it on the wastegate and anywhere else on the turbo, so that it holds the tension so the port inside the turbo wouldnt open..

its kinda hard to explain, if you dont understand let me know, and i'd try to take a picture, and demonstrate..
 
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garry goodall

Member +
wouldnt that method your talking about be very unpredictable, there are certain factors that need taking into account such as the length, thickness and pitch of a standard spring, iam very sure it is possible but doesnt the actuator also work with the pressure as it is a concealed unit?
you could proberbly use a very light spring on the actuator arm to help it in the higher rpm to keep the wastegate shut but i wouldnt advise this, you could pick up a hks unit quite cheap 2nd hand which would work more efficiently and effectivly and would save alot of hassle rather than a bodge job, cutting corners leads to engine going bang.
 
Texx

Texx

Super Moderator
jason_sureshot said:
There is a quick and cheap way to get away from this problem however...

What Garry Goodall said is very true, these CT9's are so very old that in the year 2010, they become very weak, so you wont get more than 10psi past 5000RPM, if you are lucky you may get full boost up to 5800RPM, then it would just drop off really quickly..

The quick, easy and very cheap (almost free) solution to this would be ... get a SPRING...

yes a normal, regular, spring...on that is small and strong enough to hold the tension, you obviously have a BOOST gauge in your car i hope, so what you do is that you take the spring and you place it on the wastegate and anywhere else on the turbo, so that it holds the tension so the port inside the turbo wouldnt open..

its kinda hard to explain, if you dont understand let me know, and i'd try to take a picture, and demonstrate..
Click to expand...


act_spring1.jpg


actuator_spring_origin.jpg



:haha:
 
C

cheadder.ep82

Member +
i have a hks accuator and had a look around for air leaks and its stil droping off so mabey its he little turbine running out of puff thanks 4 de help lads
 
R

Rev

Member +
I tried the spring thingy and now have 17psi instead of 15 psi but when accelerating quickly the revs still drop at 4000 RPM
( before 3500 - 4000 ) the engine feels like its stalling until I back off the boost then revs go up again. Maybe fuel Cut ?

I guess I need a hks actuator ? but I thought they are rated to 17.4 psi ( 1.2 bar ) I was hoping for 18psi . What do you guys suggest?
 
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R

Rev

Member +
$2 for 5psi

Well you won't believe it. I took the inner pod off a pod filter put it on the intake and now Texx's spring is working a treat . I have no Fuel cut ( Maf ) and it revs smoothly straight up to 20psi before you realize.

Time to dyno. Dyno says bad fueling so I added a SAFCII
and peak boost is now 18psi and 15psi at higher revs with
better hp than previously at 20psi.
 
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