GT35R boost creep
Jan 31, 2009, 01:17 PM
#1
GT35R boost creep
i have ETS equal length GT35R tial 38mm WG on 2.3L with DI intake manifold. i'm getting boost creep.
it boost 21psi and creep up to 23-24psi. try every MBC and even EBC still does it. help.
my evo a fully built time attack evo. but recently i turn it into a street car so i end up putting Apexi Worldsport exhaust. it's piece of crap. but it's quiet. anyway i wonder if exhaust would cause the creep or my tial 38mm WG? experts please chime in. thanks
[/QUOTE]
it boost 21psi and creep up to 23-24psi. try every MBC and even EBC still does it. help.
my evo a fully built time attack evo. but recently i turn it into a street car so i end up putting Apexi Worldsport exhaust. it's piece of crap. but it's quiet. anyway i wonder if exhaust would cause the creep or my tial 38mm WG? experts please chime in. thanks
[/QUOTE]
Last edited by vboy425; Jan 31, 2009 at 01:23 PM.
boost creep
Jan 31, 2009, 09:46 PM
#4
could'nt it also be the lack of flow or restrictive exhaust you put in also?
and lol charlie, you're trying to drive this beast on the streets? didnt you get pulled over like 100 feet from your shop last time? haha this thing sound like a beast and is likely fully stripped!
and lol charlie, you're trying to drive this beast on the streets? didnt you get pulled over like 100 feet from your shop last time? haha this thing sound like a beast and is likely fully stripped!
Jan 31, 2009, 10:02 PM
#5
could'nt it also be the lack of flow or restrictive exhaust you put in also?
and lol charlie, you're trying to drive this beast on the streets? didnt you get pulled over like 100 feet from your shop last time? haha this thing sound like a beast and is likely fully stripped!
and lol charlie, you're trying to drive this beast on the streets? didnt you get pulled over like 100 feet from your shop last time? haha this thing sound like a beast and is likely fully stripped!
now it very quiet. anyway i think exhaust will create boost creep. Actually a more restricted exhaust will help cure boost creep. i got different answers. bump 
Last edited by vboy425; Jan 31, 2009 at 10:12 PM.
Jan 31, 2009, 10:05 PM
#6
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What turbine housing are you running? Maybe if you went to one size looser housing(e.g., .82 vs. .63) it would ease the creep. Although I guess that it would slow down the spool too much for your purpose, huh? As an alternative you could go to an HTA compressor wheel and a one size larger turbine housing. This should keep spoolup about the same but at the same time the looser turbine housing should relieve the creep.
Another option might be to flange the manifold for a second 38 mm. Tial instead of going to a single 44 mm. gate. This setup with two smaller gates could be adjusted to provide faster spoolup than the larger single-gated setup.
Another option might be to flange the manifold for a second 38 mm. Tial instead of going to a single 44 mm. gate. This setup with two smaller gates could be adjusted to provide faster spoolup than the larger single-gated setup.
Last edited by sparky; Jan 31, 2009 at 10:15 PM.
Jan 31, 2009, 10:12 PM
#7
What turbine housing are you running? Maybe if you went to one size looser housing(e.g., .82 vs. .63) it would ease the creep. Although I guess that it would slow down the spool too much for your purpose, huh?
Another option might be to flange the manifold for a second 38 mm. Tial instead of going to a single 44 mm. gate.
Another option might be to flange the manifold for a second 38 mm. Tial instead of going to a single 44 mm. gate.
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Jan 31, 2009, 10:23 PM
#8
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Definitely the larger single gate would be a more economical option. However, you are not experiencing very significant creep and you might look into whether or not you can slightly port the 38mm tial's flange just enough to cure the slight creep.
Last edited by sparky; Jan 31, 2009 at 10:26 PM.
Jan 31, 2009, 10:37 PM
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and I was thinking of BOV flanges which are usually made of cast aluminum and are fairly easy to port out. However I don't know if the Tial WG weld flange is made out of cast iron or what other material. I would think that if it is a fairly thick cast piece that you could grind on the transition from the manifold ito the WG flange smoothing out the entry radius and enlarge the flange internally on up to the area right before the WG valve. But, I am just guessing since I have never seen a Tial WG up close.
Jan 31, 2009, 10:49 PM
#12
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If you have it set for 21# and it's only creeping to 23-24#, then you are not that far off from being right on boostwise. 2-3# is about normal creep in the colder winter weather.
It would be a shame to go and spend a lot of money just to eliminate that slight amount of creep. Are you getting knock at 24# on boost? What gear are you checking boost in?
I reread your post and your new, more restrictive exhaust might possibly be a factor. What exhaust were you running before? Are you using a catalytic convertor?
It would be a shame to go and spend a lot of money just to eliminate that slight amount of creep. Are you getting knock at 24# on boost? What gear are you checking boost in?
I reread your post and your new, more restrictive exhaust might possibly be a factor. What exhaust were you running before? Are you using a catalytic convertor?
Feb 1, 2009, 01:14 AM
#14
If you have it set for 21# and it's only creeping to 23-24#, then you are not that far off from being right on boostwise. 2-3# is about normal creep in the colder winter weather.
It would be a shame to go and spend a lot of money just to eliminate that slight amount of creep. Are you getting knock at 24# on boost? What gear are you checking boost in?
I reread your post and your new, more restrictive exhaust might possibly be a factor. What exhaust were you running before? Are you using a catalytic convertor?
It would be a shame to go and spend a lot of money just to eliminate that slight amount of creep. Are you getting knock at 24# on boost? What gear are you checking boost in?
I reread your post and your new, more restrictive exhaust might possibly be a factor. What exhaust were you running before? Are you using a catalytic convertor?
no i have no knock issues.
after intensive cleaning the WG. fk it didn't help. i guess i will sent it out to ETS for the 44mm WG.
Last edited by vboy425; Feb 1, 2009 at 01:21 AM.
Feb 1, 2009, 09:35 AM
#15
i dont think that the 38mm wastegate is the problem. I was able to run 5 psi (with a 5psi wastegate spring) on my 2.3L 30r with a tial 38mm. I currently run either 18 psi (wastegate pressure) or 26-27 psi all with the same 38mm tial. Is your wastegate recirculated or dumped VTA?
the reason most kits come with 44's is for the trick v-bands that everyone wants
the reason most kits come with 44's is for the trick v-bands that everyone wants