Duramax Diesels Forum Truck of the Week
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Old 05-24-2016, 06:34 PM
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Default W/S. Stock appearing IHI boost numbers?

I know boost doesn't tell the hole tale but what are guys seeing out of there s300 based ihi on the pulling track?? I'm only seeing around 34# at 3700rpm. I'm having a hard time driving the charger hard enough. 66m comp and 74mm turbine. Added some timeing seemed to help some.
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Old 05-24-2016, 06:37 PM
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Default W/S. Stock appearing IHI boost numbers?

I was seeing 45 psi when I ran RCD's 66/74 IHI, but it was getting pushed pretty hard!
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Old 05-24-2016, 06:50 PM
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Quote:
Originally Posted by stealthy_max View Post
I was seeing 45 psi when I ran RCD's 66/74 IHI, but it was getting pushed pretty hard!
Was that on track boost numbers?
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Old 05-24-2016, 06:53 PM
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Yes, 44-46 on the track. It would spike 50 psi on the street.
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Old 05-24-2016, 07:01 PM
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Yea that's what I was hoping for but I am just not seeing it. Maybe it's in the tuning
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Old 05-24-2016, 07:09 PM
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It is.
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Old 05-24-2016, 07:19 PM
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Make sure the waste gate is all the way closed and sealing good. When I ran a DTS Billet 66/74 IHI I wired the wastegate shut and was seeing 43-45psi pulling.
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Old 05-24-2016, 07:23 PM
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I don't think the waste gate is moving because I blocked the reference hose to it but I could try wiring it also. Thanks for the input
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Old 05-24-2016, 07:25 PM
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I welded mine shut.
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Old 05-24-2016, 07:32 PM
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Quote:
Originally Posted by greendury View Post
I don't think the waste gate is moving because I blocked the reference hose to it but I could try wiring it also. Thanks for the input
Drive pressure will blow it open as well......


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Old 05-24-2016, 07:35 PM
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I guess I didn't think of drive pressure being able to over come the spring in the gate. I wish I would have just welded it when it was apart.
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Old 05-25-2016, 11:33 AM
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I've seen 41 psi on stock everything expect motorops tunes


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Old 05-25-2016, 05:12 PM
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On an lb7?
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Old 05-25-2016, 05:32 PM
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On a stock ihi? Doubt it.

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Old 05-25-2016, 07:52 PM
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Nah, stock lml turbo. I wasn't familiar with imi til I googled it, now I'm just kinda familiar haha


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