GTIsRule Road Race Evo IX

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Oct 7, 2011 | 08:43 AM

#16

blackenedwings

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From: Columbia, MD

Quote:

Originally Posted by GregGSC

that graph make's me smile. 22psi stock bottom end 400whp... Thats about perfect for an evo and a road course.

Yup!! 400 whp on a road race car is awesome.

Oct 10, 2011 | 10:03 AM

#17

JohnBradley

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From: Northwest

Quote:

Originally Posted by LGshow19

That is some nice power Aaron, what wastegate is on there? is it preloaded any?

I ask because my current setup drops from 30psi to 23-24psi... i have a 25psi and preloaded without cutting threads. I know the 9turbo runs out of steam up top, but just wondering.

Stock IX wastegate with no preload. MIVEC can go a long way in how the boost holds. Doesnt always mean the boost makes power though.

Oct 10, 2011 | 05:56 PM

#18

JohnBradley

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From: Northwest

Updated...got the video public.

Oct 12, 2011 | 02:25 PM

#19

JohnBradley

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From: Northwest

So we just put the JMFabrications O2 dump on Jason's car and went back to the dyno. I could tell on the street that it definitely felt snappier (as well as louder...but thats what I like) than before even at 24.5psi by the Tru-boost.

This is what it did-

WOW, global 30whp/30 ft lbs for $320.00? Not bad at all.

Up top at 28.5psi where it had made 405whp before it now makes 421/377-

Aaron

Oct 12, 2011 | 03:11 PM

#20

LGshow19

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This thing is a beast!

Oct 12, 2011 | 04:29 PM

#21

sparky

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From: Mesoamerica/ SF Bay Area

Quote:

Originally Posted by LGshow19

...what wastegate is on there? is it preloaded any?....my current setup drops from 30psi to 23-24psi... i have a 25psi and preloaded without cutting threads. I know the 9turbo runs out of steam up top.....

The stock IX turbo is known for exhibiting a relatively significant level of boost taper. However, the type of wastegate used, and/or the amount of WG preload employed should not have much, if anything to do with taper.

Granted, your turbo tapers as fitted with the 25# WGA, but it would also taper equally if fitted with the FP 18# actuator, the stock actuator, or even a Forge actuator. Boost taper and wastegate preload are not interrelated. Or, at least they shouldn't be based on my way of thinking. Maybe I don't quite understand your question to Aaron, or else I may be totally wrong due to my limited understanding of the phenomenon of boost taper.

Last edited by sparky; Oct 12, 2011 at 05:25 PM.