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Boost question


xaisomboun
Member
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Galant VR-4 org Post #: 1038870 posted 12/09/11 01:39 AM     Remind Me!  Send Private Message   Edit Post      
313 checkin in here with a boost question!

So I used to have it set around 15 psi and when I would go WOT in 2nd or anything, it would jump to 19, almost 20 psi before settling back down to 15 evenly.

Is this normal?? Is this bad?? How can I stop it from happening?

Just as a precaution before I blow anything up, I set it back down to 10 psi and it only jumps like half a psi before settling down to 10.

Posts: 117 | From: Minnesota | Member Since: 06/19/11 | IP: (71.63.230.140) | Report this post to a Moderator

Brunoboy
Jesus Clips
352/1000
556/1000


Galant VR-4 org Post #: 1038879 posted 12/09/11 03:20 AM     Remind Me!  Send Private Message   Edit Post      
Boost creep



556/1000 KG 8/10/13 .... Sold
352/1000 Summit White sold in 2011 and was totaled by new owner......
92 Eclipse Gsx R.I.P
96 Eclipse Gsx Sold

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turbowop
Hard Snarker
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Galant VR-4 org Post #: 1038880 posted 12/09/11 03:27 AM     Remind Me!  Send Private Message   Edit Post      
No. Boost creep is when the boost stops at the set level, but then creeps upward as the RPM's go up. If you aren't 100% of the answer, please don't post misinformation. You just confuse people.

What you have is just a boost spike. I find that I get less spike when tapping an intercooler pipe or the compressor housing of the turbo as a pressure source for the boost controller, and see a larger spike when tapping the intake manifold or a line off of it, like the BOV line. It is also dependent on the boost controller you use.



-Mark

A face only a grocery shopper could love.
1051


Edited by turbowop (12/09/11 03:28 AM)

Posts: 11967 | From: Yakima, WA | Member Since: 04/29/01 | IP: (68.185.46.9) | Report this post to a Moderator

Brunoboy
Jesus Clips
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Galant VR-4 org Post #: 1038885 posted 12/09/11 04:45 AM     Remind Me!  Send Private Message   Edit Post      
my mistake wop, i meant to say spike....I posted it while at a local coffee shop.



556/1000 KG 8/10/13 .... Sold
352/1000 Summit White sold in 2011 and was totaled by new owner......
92 Eclipse Gsx R.I.P
96 Eclipse Gsx Sold

Posts: 2880 | From: San Bruno,CA Home of SFO | Member Since: 04/25/08 | IP: (74.51.145.216) | Report this post to a Moderator

xaisomboun
Member
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Galant VR-4 org Post #: 1038921 posted 12/09/11 12:15 PM     Remind Me!  Send Private Message   Edit Post      
Quoting turbowop:

No. Boost creep is when the boost stops at the set level, but then creeps upward as the RPM's go up. If you aren't 100% of the answer, please don't post misinformation. You just confuse people.

What you have is just a boost spike. I find that I get less spike when tapping an intercooler pipe or the compressor housing of the turbo as a pressure source for the boost controller, and see a larger spike when tapping the intake manifold or a line off of it, like the BOV line. It is also dependent on the boost controller you use.




If I tapped off the intercooler piping, would I just swap sources from the BOV and Boost guage? I have the garage mod done to my BOV.
Also the manual boost controller I use is some no name brand my friend got me as a present. This could also be a likely cause right?

Posts: 117 | From: Minnesota | Member Since: 06/19/11 | IP: (71.63.230.140) | Report this post to a Moderator

LIV4PSI
dyslexic 1051
1501/2000


Galant VR-4 org Post #: 1038930 posted 12/09/11 01:21 PM     Remind Me!  Send Private Message   Edit Post      
Quoting brunoboy:

Boost creep




Turbowop is right, it is a boost spike. Here is an excellent video for anyone who has 8 minutes to spare

click

OP, a better boost controller can't be a bad idea. They are rather simple in design, but I have seen some horribly made cheap ones.



-Craig
1501 Build Thread


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Brunoboy
Jesus Clips
352/1000
556/1000


Galant VR-4 org Post #: 1038936 posted 12/09/11 01:43 PM     Remind Me!  Send Private Message   Edit Post      
I know hes right...I was in a rush to post....



556/1000 KG 8/10/13 .... Sold
352/1000 Summit White sold in 2011 and was totaled by new owner......
92 Eclipse Gsx R.I.P
96 Eclipse Gsx Sold

Posts: 2880 | From: San Bruno,CA Home of SFO | Member Since: 04/25/08 | IP: (74.51.145.216) | Report this post to a Moderator

turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 1038983 posted 12/09/11 04:58 PM     Remind Me!  Send Private Message   Edit Post      
Sorry if I sounded harsh. It seems as if there have been a lot of posts like that lately, which bugs the shit out of me. If it was just a smartphone whoops I posted something I didn't mean to, than so be it.



-Mark

A face only a grocery shopper could love.
1051

Posts: 11967 | From: Yakima, WA | Member Since: 04/29/01 | IP: (68.185.46.9) | Report this post to a Moderator

turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 1038984 posted 12/09/11 05:03 PM     Remind Me!  Send Private Message   Edit Post      
Quoting xaisomboun:

Quoting turbowop:

No. Boost creep is when the boost stops at the set level, but then creeps upward as the RPM's go up. If you aren't 100% of the answer, please don't post misinformation. You just confuse people.

What you have is just a boost spike. I find that I get less spike when tapping an intercooler pipe or the compressor housing of the turbo as a pressure source for the boost controller, and see a larger spike when tapping the intake manifold or a line off of it, like the BOV line. It is also dependent on the boost controller you use.




If I tapped off the intercooler piping, would I just swap sources from the BOV and Boost guage? I have the garage mod done to my BOV.
Also the manual boost controller I use is some no name brand my friend got me as a present. This could also be a likely cause right?




The BOV and gauge are probably sourced from the intake manifold since both need to see vacuum as well (if you have a boost gauge that reads vacuum that is). You boost controller only needs to see boost pressure. If you want to tap an intercooler pipe, you will need to install a nipple or find an existing one to use somewhere on the piping. On 503 I use one off the turbo outlet, and on 1051 I tapped and threaded the upper intercooler pipe for a nipple.

The boost controller that came with 503 when I bought it was a pile of shit made from Home Depot parts. It would spike like 10psi. I installed a $50 Hallman unit and it only spikes about 3psi with it tapped off the compressor outlet. Works great.



-Mark

A face only a grocery shopper could love.
1051

Posts: 11967 | From: Yakima, WA | Member Since: 04/29/01 | IP: (68.185.46.9) | Report this post to a Moderator

Brunoboy
Jesus Clips
352/1000
556/1000


Galant VR-4 org Post #: 1039001 posted 12/09/11 06:27 PM     Remind Me!  Send Private Message   Edit Post      
Quoting turbowop:

Sorry if I sounded harsh. It seems as if there have been a lot of posts like that lately, which bugs the shit out of me. If it was just a smartphone whoops I posted something I didn't mean to, than so be it.



I know what you mean. All good wop , you know I've been on here long enough to know better.
-shane



556/1000 KG 8/10/13 .... Sold
352/1000 Summit White sold in 2011 and was totaled by new owner......
92 Eclipse Gsx R.I.P
96 Eclipse Gsx Sold

Posts: 2880 | From: San Bruno,CA Home of SFO | Member Since: 04/25/08 | IP: (74.51.145.216) | Report this post to a Moderator

MellowVR4
5" too short
372/2000


Galant VR-4 org Post #: 1039111 posted 12/10/11 11:20 AM     Remind Me!  Send Private Message   Edit Post      
i fixed my spiking problem with the lower shore mbc, ported the exh housing and waste gate hole, 34mm flapper and ported the o2 housing. Also i tapped the j pipe for the pressure source that i needed. needle does not move after it hits it set point. lower shores mbc works great, gotta give it to them.



89 RAIDER V6 5speed
90 GALANT GSX SOLD
91 372/2000 making it pretty again
91 578/2000 sold
92 417/1000 DIED
87 4RUNNER LS400 SWAP SOLD:(

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xaisomboun
Member
313/1000


Galant VR-4 org Post #: 1039191 posted 12/10/11 06:00 PM     Remind Me!  Send Private Message   Edit Post      
Alright thanks for the input guys! Time to save up for a new MBC lol

Posts: 117 | From: Minnesota | Member Since: 06/19/11 | IP: (71.63.230.140) | Report this post to a Moderator

xaisomboun
Member
313/1000


Galant VR-4 org Post #: 1039866 posted 12/14/11 01:35 AM     Remind Me!  Send Private Message   Edit Post   
Quoting MellowVR4:

i fixed my spiking problem with the lower shore mbc, ported the exh housing and waste gate hole, 34mm flapper and ported the o2 housing. Also i tapped the j pipe for the pressure source that i needed. needle does not move after it hits it set point. lower shores mbc works great, gotta give it to them.




Question, where can I get a LSP boost controller?? Ive googled all over to no avail..

Posts: 117 | From: Minnesota | Member Since: 06/19/11 | IP: (71.63.230.140) | Report this post to a Moderator


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