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help on lowering boost levels 

 

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 Post subject: help on lowering boost levels
Posted: Sat Mar 04, 2006 4:05 pm 
Oompa Loompa
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hi there, just wondering if there is anyway to lower boost levels.

as i have a mini im going to muck around with and put a turbo on it, i dont want to run the turbo at its normal boost level because it mite be too much for the engine so to make sure i dont blow it up first go i want to lower the boost to a safer level.
will a boost controller do this, or can they only increase the boost?

any help will be very good
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Posted: Sat Mar 04, 2006 5:28 pm 
Getting Side Ways
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yes boost controller will only incress the pressure. u will need a smaller spring in wastegate

 

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Posted: Sat Mar 04, 2006 5:30 pm 
Oompa Loompa
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or put restrictors in the vaccum line

 

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Posted: Sat Mar 04, 2006 6:21 pm 
Getting Side Ways
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putting restrictors in vacume line is the same as a boost controller it will not lower boost pressure

 

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Posted: Sat Mar 04, 2006 7:14 pm 
Oompa Loompa
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a smaller spring in the wastegate you say......
are there differnt wastegates i could buy already like this,
or do i have to do it my self, is it a hard mod to carry out?
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Posted: Sun Mar 05, 2006 1:32 am 
Stock as a Rock
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I dont think it should be a very big mod. I guess it depends of the wastegate.

However there is another way. Most probably not as efficient but it shows you another way.

Just goto the autospeed website and do a search for 'venting boost'.
Have a quick read of that and let us know what you think of it.
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Posted: Sun Mar 05, 2006 1:02 pm 
Getting Side Ways
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a wastegate with an adjustable rod.

change the length =change the boost

 

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Posted: Sun Mar 05, 2006 3:41 pm 
Oompa Loompa
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the venting boost pages seemed sorta hard to understand but still interesting but i need to pay for the pages or some crap so i left it at that,

i had a brief look into the adjustable wastegate rod thing and that dont seem too hard
i added a pic i found to see if thats what you are talking about,
so i think making the adjustable rod would be better cos it is easily adjustable, campared to the spring method i'd need to get a whole heap of springs and keep changeing them to get the boost i want

 

 

Attachments:
Adj_wastegate.jpg
Adj_wastegate.jpg [ 106.28 KiB | Viewed 59 times ]
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Posted: Mon Mar 06, 2006 12:16 am 
Getting Side Ways
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Yes that will take preload from diaphram..You can purchase a low Lb wastegate if its an intergrated wastegate.. Having a rstrictive exhaust will limit boost / power also..Mazda did this on the Turbo 626's...

 

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