 Stock St205 running 10-12 then 14psi |
 Mar 15, 2011 - 10:37 AM
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Enthusiast  Joined Aug 15, '10 From Nevis, West Indies Currently Offline Reputation: 0 (0%)  |
hey, am wondering if my vsv has an issue, normally my car would build boost slowly to 12psi in 2nd gear+, only reaching 12psi at about 6000rpm upwards.
but yesterday I did absolutely nothin to the car, and it begins running 14psi, boost needle shoots right up to 14psi and soon as I get on the gas. Is this a problem? any info or advice is appreciated. Its is basically stock with an HKS intake, gutted cat and a 3" exhaust from midpipe back. -------------------- 1994 Toyota Celica GT-Four ST205 Turbo 4WD, Black
Nevis, West Indies |
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Apr 11, 2011 - 10:55 PM
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 Enthusiast Joined Feb 11, '08 From Auckland, New Zealand Currently Offline Reputation: 0 (0%) |
It can vary.
Just keep in mind the magical figure is 10psi. Thats the wastegate spring in a CT20b. Boosting in excess of 10psi is normal due to the TVSV bleeding air off back into the idler piping it should be 11psi 1st gear, 12psi 2nd gear, 13psi 3rd+ gear When my turbo suddenly went from 13psi to 16psi I knew I had problems with the turbo. I think it's due to the wastegate being so small it can't relieve enough pressure for varying conditions and in my case having an upgraded turbine and compressor wheel. -------------------- Mike W
1996 Toyota Celica ST205 GT-FOUR GT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC 269awhp / 273ft-lbs |
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Apr 12, 2011 - 1:43 AM
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Enthusiast Joined Aug 15, '10 From Nevis, West Indies Currently Offline Reputation: 0 (0%) |
QUOTE (delusionz @ Apr 11, 2011 - 10:55 PM)  It can vary. Just keep in mind the magical figure is 10psi. Thats the wastegate spring in a CT20b. Boosting in excess of 10psi is normal due to the TVSV bleeding air off back into the idler piping it should be 11psi 1st gear, 12psi 2nd gear, 13psi 3rd+ gear When my turbo suddenly went from 13psi to 16psi I knew I had problems with the turbo. I think it's due to the wastegate being so small it can't relieve enough pressure for varying conditions and in my case having an upgraded turbine and compressor wheel. Currently I think my TVSV is not functioning though, its running steady 10psi and take forever to reach 10psi like only at 5-7200 rpm no matter the gear. You have upgraded from CT20B to what turbo? -------------------- 1994 Toyota Celica GT-Four ST205 Turbo 4WD, Black
Nevis, West Indies |
Posts in this topic
cax_11 Stock St205 running 10-12 then 14psi Mar 15, 2011 - 10:37 AM
presure2 maybe a leak in one of the vac lines between the T... Mar 15, 2011 - 11:34 AM
cax_11 QUOTE (presure2 @ Mar 15, 2011 - 12... Mar 15, 2011 - 2:18 PM presure2 QUOTE (cax_11 @ Mar 15, 2011 - 3:18 ... Mar 15, 2011 - 5:30 PM cax_11 QUOTE (presure2 @ Mar 15, 2011 - 6:3... Mar 15, 2011 - 5:45 PM schmooot well stock is 12, so on the days when it is runnin... Mar 16, 2011 - 9:12 AM cax_11 QUOTE (schmooot @ Mar 16, 2011 - 9:1... Mar 16, 2011 - 9:15 AM delusionz CT20b is a very responsive turbo by nature and the... Apr 12, 2011 - 2:13 AM cax_11 I think there is probably a problem with my wasteg... Apr 12, 2011 - 8:50 PM delusionz QUOTE (cax_11 @ Apr 13, 2011 - 1:50 ... Apr 13, 2011 - 12:31 AM cax_11 Ok, It is responsive it max at 10psi majority of t... Apr 18, 2011 - 1:29 AM delusionz Checked for codes?
Sometimes you'll have a co... Apr 18, 2011 - 5:15 PM cax_11 it has no codes.. Apr 18, 2011 - 5:41 PM |
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