So is 10psi old school info
Registered User
Joined: Feb 2004
Posts: 591
Likes: 0
From: Lafayette, LA
That AEM Meth inj kit looks nice with the failsafe relay output to EMS. Are you going to keep your current boost map for the failsafe and retune a second higher boost map for when meth is working? Oh I just noticed you are adding a testpipe, so I guess you would need to retune the safe map too. Hope it gives you at least the +20/20. Down in my neck of the woods it ought to give at least that much (with our hellacious Louisiana heat).
Joined: Sep 2004
Posts: 4,894
Likes: 9
From: Tampa, FL
Yes it is old school info.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Registered User
Joined: Jun 2008
Posts: 232
Likes: 0
Originally Posted by spectacle,Sep 25 2008, 01:13 PM
Yes it is old school info.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Cheers
Mark
Registered User
Joined: Aug 2003
Posts: 3,170
Likes: 0
From: SLC, UT
Originally Posted by thrillissues,Sep 21 2008, 07:35 PM
Knock in simple terms is caused from incorrect timing created by improper fuel mixtures, early fuel detonation, etc. Knock is bad at all times regardless of your peak boost pressure. Just because you can't hear knock when increasing boost doesn't mean you aren't creating lean conditions and/or causing damage to your internals with high combustion temperatures! 
As for the head... increasing boost pressure too high can lift the head enough to break the seal of your head gasket.
Solution is to upgrade head studs and head gasket. I don't know the particulars of the recommended max boost for a stock head gasket and head studs but I'm sure the info is somewhere on s2ki. Compression ratio and timing can also be altered slightly with the thickness of the head gasket.
If you already have knock there are a lot of possible problems, but they should be limited to the ignition or fuel system.
Also don't forget the more power you start making the more parts of the drive train will start needing replaced!
As for the head... increasing boost pressure too high can lift the head enough to break the seal of your head gasket.
Solution is to upgrade head studs and head gasket. I don't know the particulars of the recommended max boost for a stock head gasket and head studs but I'm sure the info is somewhere on s2ki. Compression ratio and timing can also be altered slightly with the thickness of the head gasket.
If you already have knock there are a lot of possible problems, but they should be limited to the ignition or fuel system.
Also don't forget the more power you start making the more parts of the drive train will start needing replaced!
10 psi is the conservative answer...plenty of guys boost more trouble free on the stock HG.
Joined: Sep 2003
Posts: 10,301
Likes: 18
From: New Jersey
Originally Posted by spectacle,Sep 25 2008, 04:13 PM
Yes it is old school info.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Boost is relative to the size of the turbo. 10 psi on a T28 isn't the same as 10 psi on a GT35R.
Lots of determining factors determine a "max psi on stock compression" rating than just the psi number.
Volume and CFMs, however, are completely different.
Community Organizer
Joined: Jun 2007
Posts: 31,070
Likes: 566
Originally Posted by Kirpich,Sep 26 2008, 07:18 PM
Yep, it's just the smaller turbo (i.e. GT25) will spool to 10 psi earlier in the RPM range.
Thread
Thread Starter
Forum
Replies
Last Post