boost pressure? drive pressure?

jjk

jjk

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May 11, 2008
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I've searched alot of threads on here in regards to my topic, if I'm rehashing the same crap, then sorry I'm a retard. I'm trying to make sure I understand this whole concept. These questions are based on a twin set-up. Lets say I'm looking for somewhere around 90 psi boost, if I'm understanding DPR, then that would mean I was looking for somewhere around 108 psi on the drive side right? That would give me a 1.2 ratio right? So if all this is true then I would want to set my external wastegate to dump at around 108 +/- right? Another question is my boost gauge would be hooked up to my intake manifold and my DP gauge hooked up to the exhaust manifold? So where do I set the wastegate on my primary, does it just constantly dump?? Thanks ahead of time....
 
jjk said:
I've searched alot of threads on here in regards to my topic, if I'm rehashing the same crap, then sorry I'm a retard. I'm trying to make sure I understand this whole concept. These questions are based on a twin set-up. Lets say I'm looking for somewhere around 90 psi boost, if I'm understanding DPR, then that would mean I was looking for somewhere around 108 psi on the drive side right? That would give me a 1.2 ratio right? So if all this is true then I would want to set my external wastegate to dump at around 108 +/- right? Another question is my boost gauge would be hooked up to my intake manifold and my DP gauge hooked up to the exhaust manifold? So where do I set the wastegate on my primary, does it just constantly dump?? Thanks ahead of time....
Click to expand...


you want your wastegate to open when you drive pressure starts rising higher than the boost.
 
bsmith said:
you want your wastegate to open when you drive pressure starts rising higher than the boost.
Click to expand...


I've heard ideal ratio is 1.2 to 1 or vice versa. So that is a 20% variance which would mean the drive pressure to be no higher than the 20% of the boost pressure.. Am I not understanding this correctly?? Thanks..
 
if you really want to set boost:TIP to 1:1, you need to take your boost reading at the compressor, at least for tuning
 
Forrest Nearing said:
if you really want to set boost:TIP to 1:1, you need to take your boost reading at the compressor, at least for tuning
Click to expand...

Ok cool. I may have forgot to mention, I am not intercooled, so if I take the boost reading from the intake won't that be the same as the compressor from the small turbo?
 
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