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switched turbo's now more boost?

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Old Sep 7, 2010 | 01:10 AM
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Default switched turbo's now more boost?
i had a s475 and i would see about 10psi, i switched to a smaller s465 and it saw about 10psi also. drove it for about 20 miles then i gave it about 60% throttle and it jumped to 14psi... should i put a smaller spring in the wastegate? i was talking to a guy that knows his turbo stuff locally and he said a boost controller wouldnt help my problem, he says my wastegate might be too small? the whole kit is from kbracing.

what you guys think i should do? i really dont want to buy another wastegate
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Old Sep 7, 2010 | 01:26 AM
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Originally Posted by slowlsx
i had a s475 and i would see about 10psi, i switched to a smaller s465 and it saw about 10psi also. drove it for about 20 miles then i gave it about 60% throttle and it jumped to 14psi... should i put a smaller spring in the wastegate? i was talking to a guy that knows his turbo stuff locally and he said a boost controller wouldnt help my problem, he says my wastegate might be too small? the whole kit is from kbracing.

what you guys think i should do? i really dont want to buy another wastegate

I'm willing to bet you were in a higher gear at low rpms. That being the case, your engine isn't spinning that fast requiring a x amount of air causing it to create more pressure. I have mine set to 10 for just driving around and if I'm in third at 2500 and get into it, it will go 12 - 15 psi at first then fall back as rpms rise.
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Old Sep 7, 2010 | 01:35 AM
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Originally Posted by 01Z28Camaro
I'm willing to bet you were in a higher gear at low rpms. That being the case, your engine isn't spinning that fast requiring a x amount of air causing it to create more pressure. I have mine set to 10 for just driving around and if I'm in third at 2500 and get into it, it will go 12 - 15 psi at first then fall back as rpms rise.
hmm i think i actually was. i beleive maybe second or third gear around 3500 rpm. i definitley wasnt flooring it i was just trying to get up to speed and looked over and saw 14psi and was like holy ****.
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Old Sep 7, 2010 | 12:12 PM
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anybody else?
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Old Sep 7, 2010 | 03:39 PM
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Wastegate is too small or you have a leak in your signal line or something. It doesn't matter where in the rpm range you see boost, your wastegate should bleed it off.
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Old Sep 7, 2010 | 09:01 PM
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i think its a jgs 50mm so i dont think it could be too small? ill look for leaks.
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Old Sep 7, 2010 | 09:28 PM
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Where are you referencing the wastegate from? Maybe your wastegate is taking longer to see boost than the engine is. Did you change anything else when you switched turbo's? Could the wastegate be sticking a little. Do you try to boost it again? Maybe it was a one time deal.
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Old Sep 7, 2010 | 09:47 PM
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have you stayed in it to see if it does taper off?
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Old Sep 7, 2010 | 10:42 PM
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Originally Posted by novaflash2002
have you stayed in it to see if it does taper off?
got scared and just let off lol i was far from home. i will do that next time tho. i just thought it wasnt going to stop making boost.
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Old Sep 7, 2010 | 10:53 PM
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dont hold it to te floor the first time to see.
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Old Sep 7, 2010 | 11:17 PM
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Originally Posted by novaflash2002
dont hold it to te floor the first time to see.
So about half throttle and see if it goes to 14psi then comes back down to 10-11
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Old Sep 8, 2010 | 12:22 AM
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yea thoat would work, u want the tubo to be working, but u can let out faster if it s not to the floor whats your afr at 10 psi? if its over 11.5 id lift.
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Old Sep 8, 2010 | 02:23 AM
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11.0-11.4 15*
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