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Bbc blower motor help!

Old 01-21-2019 | 08:16 PM
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Old 01-22-2019 | 08:23 AM
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That dyno sheet looks Rich on af.
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Old 01-22-2019 | 11:24 AM
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Originally Posted by Daytona25
It’s goin in a 25’ Daytona with a brand new hp transom assembly and new built xr upper with a bmax 2” shortie lower all new from bravo shop last season.
I’d be prepared to upgrade the drive. I couldn’t keep a Bravo XR drive alive for 20 hours behind a blown 540 in a single engine AO. Went through 3 in 2 seasons and then upgraded to IMCO SCX. Healthy BBC blower motors crush Bravo drives.
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Old 01-22-2019 | 01:03 PM
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I’m more wondering what is causing the dip in power above 5300rpm, is it a cam or blower restriction??
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Old 01-22-2019 | 01:16 PM
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Second wind I’ve heard that, and also heard a lot of people have fairly good luck with xr in smaller cat with big power if you drive it right?!
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Old 01-22-2019 | 07:51 PM
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Daytona25 - before i cut the hole and mounted my neutral extension box I called Eliminator and asked them what the IDEAL height for the prop was for max speed.
They told me 2 inches up from the lowest point on the bottom of the boat.
They also told me the boat would be a challenge to get on plane.
But with some Tinkering I was able to get the boat on plane without much trouble.
With a Bravo 4 blade prop.
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Old 01-22-2019 | 08:59 PM
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Originally Posted by 14 apache
That dyno sheet looks Rich on af.
Most dyno's do when using airflow vs fuel flow for AF. Waste of time, Don't know why the dynos are even set up this way since this way of doing AF is always way off..

Needs wideband.
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Old 01-22-2019 | 10:24 PM
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Originally Posted by SB
Most dyno's do when using airflow vs fuel flow for AF. Waste of time, Don't know why the dynos are even set up this way since this way of doing AF is always way off..

Needs wideband.
that is wide band has left and right bank
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Old 01-23-2019 | 08:18 AM
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Originally Posted by Daytona25
Second wind I’ve heard that, and also heard a lot of people have fairly good luck with xr in smaller cat with big power if you drive it right?!
I’ve heard the drive it right theory too. Those are the guys who idle to the cove I think. With a high x-dimension and 800 plus ft pounds of torque at 3500rpm you’re smashing that puny out drive just getting on plane.
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Old 01-24-2019 | 06:59 AM
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Also gonna cam swap when I do the blower swap do you think the 651 crane will work for my setup?
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