Considering switching from .91 hoising to 1.0?

monster50iii

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Dec 5, 2014
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I hit the dyno recently, and hit 655hp and 1171tq on a conservative tune. I'm happy for the most part where I stopped. My issue is I drop 100hp roughly from 2850rpms to 3700rpms. My fueling stays constant which makes me believe my turbine is choking the engine. My charger is a 64.5/.91/73 sxe. Do I have enough compressor to swap to the 1.0 hpusing and free up some top end power? Even a 500hp tune dips off pretty good above 3000rpms.
 

Bdsankey

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Feb 1, 2018
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I would check that first before swapping housings. I would guess you're likely running into an airflow problem but it's better to be sure instead of throwing parts at something.
 

D_Ferrante801

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Apr 2, 2019
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What does EGT do during that area?

is boost tapering off during this time? Rail pressure holding steady? TQ values staying flat and following?
 

monster50iii

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Dec 5, 2014
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I have a tool coming so I can test for boost leaks. I've seen my max boost be at 42psi around 2800, and as rpms pick up watch it drop to nearly 32psi. I bought a tool that I can hopefully safely test my system to 40psi. I suspect my oring at the stupid plastic elbow on the cold side off the intercooler may be the culprit. We will see..

Rp held great, and it carried commanded pulse the entire pull. Egts get warm, right around 1600. At 3400 I'm commanding 2300us and only 21deg timing. I'm sure more timing would help some but I want this thing to live lol.

I'm already on the boost dealio. But I couldn't help but ponder about the exhaust housing.


Thanks for the replys!
 

monster50iii

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Dec 5, 2014
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I ordered a 1.0 housing.. I may also have it machine for a 66 wheel this fall/winter. I'll probably get to the dyno again after the housing swap to see what the gains are.
 

monster50iii

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Dec 5, 2014
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Swapped housings; I did one pull tonight and egts got to 1427*. Before I would see nearly 1600*. Next is dyno time at some point!
 

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