Subject	Base boost was originally 18psi, then I dropped it to 14psi
Posted by	Ash's Z on February 18, 2006 at 10:11 AM
	This message has been viewed 52 times.
In Reply To	whoops, I thought I read it was the auto housings... posted by Shawn300zTT GT28R MD on February 17, 2006 at 10:26 PM
Message	and it did the same thing. So I dropped it to 10psi base, and it still has a lot of boost creep - hitting ~23psi by 8KRPM. The problem I think is exacerbated by the design of my supersplit downpipes and a full 3" exhaust - I have a 2" turbine exhaust pipe and a 1 5/8" wastegate dump pipe. It is much easier to move the exhaust through the turbine and out the 2" turbine exhaust than it is to move it through the 0.785" wastegate port and out the 1 5/8" wastegate dump pipe. The 0.785" wastegate port is a good bit smaller than the 1 5/8" dump pipe so I am inclined to believe that the problem is just that the wastegate port itself is too small with this exhaust configuration. I have opened the wastegate port up to 0.885", but I'm not sure if this is going to be ample and I want to make sure I dont end up pulling them again. [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	AshsZ-II Ultimate Street Z Progress: Turbo Removal: 3hrs - Ash's Z 19:30:36 02/17/06 nice with the motor in the car and everything... looks good (n/m) - chris@boostpro.net 19:32:27 02/17/06 I'm gonna try and pull a monkey out of my - zgene4 19:38:13 02/17/06 nice hope u fix it.. didnt u rig that motor,exhaust,manifold - fst300zx 19:45:43 02/17/06 Yep - you can access the turbine housing bolts relatively - Ash's Z 20:11:33 02/17/06 Ash, what parts did you repostion...and where - jzee32tt 20:19:26 02/17/06 I didn't move anything around in the engine bay for the - Ash's Z 20:33:09 02/17/06 You have way more patience than me my friend. - Riddick 19:58:12 02/17/06 I built and positioned the turbos for easy access to the - Ash's Z 20:06:55 02/17/06 Ah. Got it now. Thanks bro for the detailed explanation. - Riddick 20:12:03 02/17/06 Wow ash, thats incredible. This setup sounds beyond - CaliguyPurdue 20:23:24 02/17/06 boost creep is common on other cars >> - ztunerz 20:40:38 02/17/06 I have 3" downpipes and have never had that problem.. - Shawn300zTT GT28R MD 20:55:17 02/17/06 They are 5speed housings, .63 A/R. - Ash's Z 22:12:04 02/17/06 whoops, I thought I read it was the auto housings... - Shawn300zTT GT28R MD 22:26:49 02/17/06 Base boost was originally 18psi, then I dropped it to 14psi - Ash's Z 10:11:04 02/18/06 Let's hope that it is not the 1 5/8" dump pipe (n/m) - govaardz(Aruba) 13:56:19 02/18/06 I have a spare set of newer HKS actuators if needed. (n/m) - SniPer SR71 (Dallas) 22:28:59 02/17/06 Hey bro, That's not really a bad problem when you think - DAYTONAZ 20:14:55 02/17/06 Not really, no. I can think of a thousand other things that - Ash's Z 20:37:13 02/17/06 How do you think the 60mm TB's are working for you? - Shawn300zTT GT28R MD 21:41:40 02/17/06 Well, I'm sure they are better than the oem units. :) (n/m) - Ash's Z 22:12:58 02/17/06 Why are the AN fittings on the EGR returns on the sides - Shawn300zTT GT28R MD 21:44:39 02/17/06 Those tie into my TiAl BOVs. (n/m) - Ash's Z 22:15:47 02/17/06 thats a pretty neat idea... - Shawn300zTT GT28R MD 22:28:03 02/17/06
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