Increased boost, made less peak HP
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From: Tulsa,OK
Joined: Nov 2008
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From: Pittsburgh, PA
Originally Posted by donaldmejr' timestamp='1344566445' post='21926142
My guess would be that you proved a few peoples thoughts that if you limited boost with a Supercharger then you would lose to much CFM's and in turn make less power.
I hope this is not the case, but very well may be the truth.
Another thought which I think is exonerated is TQ drop due to over-spinning the blower. Based on impeller math, we overspin the blower around 7400RPM. I would think that the blower should be making enough CFM up to this point (although it would be on the edge of the compressor maps)
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From: South Florida
remember this, as boost drops, you hit different parts of the tune. ie rpm and boost = timing and fuel to run. as boost is diving up top your falling into different parts of the map, no doubt untuned or poorly tuned, which explains why you cant maintain at least your previous power at peak rpm and that boost.
get that boost falling problem fixed then get retuned, i bet power will climb and then flatten off, which is what should happen.
get that boost falling problem fixed then get retuned, i bet power will climb and then flatten off, which is what should happen.
Joined: Sep 2004
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From: Tampa, FL
From looking at the graphs you posted (good job btw), I disagree with what a lot of people are saying. Even though power and psi did fall off up top, you were still making more boost than previous so it should have made more power. You're on to something with the AFR going rich though. It might be worth disconnecting your exhaust and putting it back on the dyno to see if the power comes back...that would tell you if the Berk is truly a restriction on the exhaust side.
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Joined: Nov 2005
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remember this, as boost drops, you hit different parts of the tune. ie rpm and boost = timing and fuel to run. as boost is diving up top your falling into different parts of the map, no doubt untuned or poorly tuned, which explains why you cant maintain at least your previous power at peak rpm and that boost.
get that boost falling problem fixed then get retuned, i bet power will climb and then flatten off, which is what should happen.
get that boost falling problem fixed then get retuned, i bet power will climb and then flatten off, which is what should happen.
From looking at the graphs you posted (good job btw), I disagree with what a lot of people are saying. Even though power and psi did fall off up top, you were still making more boost than previous so it should have made more power. You're on to something with the AFR going rich though. It might be worth disconnecting your exhaust and putting it back on the dyno to see if the power comes back...that would tell you if the Berk is truly a restriction on the exhaust side.