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Evo 8 not making anymore boost

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Old Jul 27, 2019 | 08:21 AM
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Evo 8 not making anymore boost

Waste gate and injectors were at 100% WOT on third and car only pushing 20 psi at the most. My question is, shouldn't i be over boosting at this point because of the 100% duty cycle on the waste gate? or is this just the way it is? I know that the evo 8s are very restricted and idk what Im missing.. Car got full bolt ons and cams along with 1200 cc injectors tuned on 94.. im trying to get more out of my tune that's all

thanks
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Old Jul 27, 2019 | 10:10 AM
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Where is it making 20psi at?
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Old Jul 27, 2019 | 10:51 AM
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Post up your WGDC tables.
A log would be fantastic as well.
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Old Jul 27, 2019 | 12:10 PM
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Are you still on the stock boost solenoid? If so, it come set at 100% duty cycle from the factory. You have to change the boost pill to get more boost with the stock solenoid. And you are at 100% duty cycle with 1200cc injectors on 94!? Even on e85, you shouldnt be maxing those out with a stock turbo.
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Old Jul 27, 2019 | 01:32 PM
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Originally Posted by Lumpy Sticks
Are you still on the stock boost solenoid? If so, it come set at 100% duty cycle from the factory. You have to change the boost pill to get more boost with the stock solenoid. And you are at 100% duty cycle with 1200cc injectors on 94!? Even on e85, you shouldnt be maxing those out with a stock turbo.
I think he was referring to 100% WGDC, not IDC.
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Old Jul 27, 2019 | 01:36 PM
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On the stock turbo, boost will tank up top, especially on oem WGA (which I think is 13psi). My 71hta tanks to about 22 psi with stock WGA. You can install a stronger WGA, but you will gain more heat with the extra boost and probably won't gain much power.

But around 3500-4000, you should be hitting 25-28 psi boost, depending on outside temps (assuming your DV holds the boost).
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Old Jul 28, 2019 | 06:53 AM
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Originally Posted by letsgetthisdone
Where is it making 20psi at?
From what i remember, the last log that i did to finish off my etune which was about a month ago, ~20psi around 7-7.5k rpm

This is weird because I was driving around the other day and did some 2nd gear pulls and gauge says 23.6psi peak boost at 6.5k rpm

got ahold of the tuner and said that there could be something wrong with my waste gate, not quite sure what he means
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Old Jul 28, 2019 | 07:03 AM
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Originally Posted by Fox_IX
Post up your WGDC tables.
A log would be fantastic as well.
I used a friends laptop during the etune and I sent a copy to myself of the last log through email and it became an SRF file instead of a CSV which cant be recognized by evoscan, I dont know how to pull out tables x)

Maybe theres away to converting it? the laptop that i used is a couple hours away xD
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Old Jul 28, 2019 | 07:05 AM
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Originally Posted by Lumpy Sticks
Are you still on the stock boost solenoid? If so, it come set at 100% duty cycle from the factory. You have to change the boost pill to get more boost with the stock solenoid. And you are at 100% duty cycle with 1200cc injectors on 94!? Even on e85, you shouldnt be maxing those out with a stock turbo.

I got a 3port grimspeed EBC
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Old Jul 28, 2019 | 07:14 AM
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Originally Posted by 2006EvoIXer
On the stock turbo, boost will tank up top, especially on oem WGA (which I think is 13psi). My 71hta tanks to about 22 psi with stock WGA. You can install a stronger WGA, but you will gain more heat with the extra boost and probably won't gain much power.

But around 3500-4000, you should be hitting 25-28 psi boost, depending on outside temps (assuming your DV holds the boost).
25-28psi? okok the highest ive seen is 23.6psi and that was from a recently 2nd gear pull at 6.5k rpm.. wondering if a sooth build up would mess with the wastegate? I remember when i was breaking in my GSC s2s, car was running rich with smokes coming out of the exhaust and I had to break the cams in for 20mins based on GSCs instruction

thanks!
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Old Jul 28, 2019 | 11:32 AM
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Tapering to 20psi is pretty normal. You're asking A LOT out of the stock turbo to run more than that past 7k
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Old Aug 5, 2019 | 07:00 PM
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Originally Posted by palaBoost
I used a friends laptop during the etune and I sent a copy to myself of the last log through email and it became an SRF file instead of a CSV which cant be recognized by evoscan, I dont know how to pull out tables x)

Maybe theres away to converting it? the laptop that i used is a couple hours away xD
Ecuflash reads both .srf and .hex files. If you load the .srf in Ecuflash, you can then "Save As..." to a .hex file that evoscan can read.

Edit:
Oops. Your post seems to say you were trying to save as a CSV but got an SRF instead. SRF is a ROM format, not a log. So you may have saved the wrong thing. Hopefully I'm reading right.

Last edited by carbon_toast; Aug 5, 2019 at 08:18 PM. Reason: Oops.
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