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boost problems

matixx

By matixx,
in Engines & Forced Induction

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matixx Enthusiast

matixx

Posted
Posted

Hi. car is playing up a little bit. Have 2530 and turbosmart rocket launcher dual switch. Just started laggin the other day for no apparaent reason, and wouldn't boost till up in the 4500 -5000rpm. I thought shit, turbos ****ed! But when i switched the boost to high it came on perfectly normal? Boosted hard and pulled all the way? I cant figure out what would happen to have these effects? any ideas anyone?

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R31 POWER Mentor

R31 POWER

Posted
Posted

When you say laggin do you mean floor it thru first and slam second and boost takes longer than usual to build up to the setting you have? If so I have the same problem with the single stage one.

It only does it like sometimes but I would hate to lose a race becuase of it(on the track of course :))

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matixx Enthusiast

matixx

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ts wierd, it takes twice as long to build up to half the boost. set at 10 psi on low setting, and at 5000rpm when it should have been at 10psi for 2000 rpm, its just slowly ticking up to 5 psi. But switch the switch and 19 pound at 4k? Dunno whats going on. I know these pneumatic systems are a little unstable and dont hold boost pressure as well as a ebc or external gate, but never had this problem before

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https://www.sau.com.au/forums/topic/35953-boost-problems/#findComment-717425
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vendetta Proficient

vendetta

Posted
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imy car is standard as just exhaust and pod and for some reason i get th e same feeling that its lagginf like hell. i step on it then seems like its going no where, when it reaches like 4500 or 5 then u can feel it boot it harder. when i dump it from like 4th into 3rd or second then it feels normal. Anyone have an idea, the turbo isnt gone theres no smoke what so ever. cant really seem to sus out a boost leak anywhere but ive only check the easy visual areas. Putting a front mount on next week maybe that might fix it??

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https://www.sau.com.au/forums/topic/35953-boost-problems/#findComment-721257
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SeriesIIGTST Mentor

SeriesIIGTST

Posted
Posted

vendetta, i had a somewhat similar experience with mine, seem to be lagging, waiting for an invitation to boost, then it would come on. I popped my bonnet and had a listen and my turbo bearings are on their way out, make a delightful crunching noise when spinning. Noise is definitely turbo as I can hear it when i put a screwdriver to the turbo (put screwdriver on cover then ear on screwdriver to listen). I hope for your sake that the turbo isn't the problem as it is with mine....

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https://www.sau.com.au/forums/topic/35953-boost-problems/#findComment-721265
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SeriesIIGTST Mentor

SeriesIIGTST

Posted
Posted

Mine's that bad, i can hear it at idle! But other than that, it felt wrong when driving it as i said so i took it home and played with throttle and listened. Then took to turbo shop for second opinion who tells me my turbo is a "time bomb".

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https://www.sau.com.au/forums/topic/35953-boost-problems/#findComment-721330
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BHDave Grand Master

BHDave

Posted
Posted

I have had this problem on the single stage switchable turbosmart.

Turned out to be the ball valve in the tee piece wasn't allowing the pressure to escape from the actuator and was holding open the waste gate. I removed the ball and spring from the tee and low boost setting worked properly again.

You shouldn't have this problem though as the low boost bleed should be allowing the pressure to get away. I didn't have a low boost adjustment so the pressure just sat there.

May be worth a shot anyway.

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https://www.sau.com.au/forums/topic/35953-boost-problems/#findComment-721519
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ABuSD Veteran

ABuSD

Posted
Posted

i have a 2 stage, turbosmart controller, and i too have this problem, but not in 1st gear, that seems fine, then 2nd and 3rd take forever to hit fullboost, i bought the car with Blitz front mount, and the turbo was apparently hi flowed with steal blades.

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