New to me blowers... Trying to guess hp

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03-23-2016 | 11:51 AM

#21

Black Baja

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From: bel air, md

Quote:

Originally Posted by Griff

The 250's are not going to add 100hp.

If he was running 5#'s with the 177's and bumps it to 7#'s with the 250's, I'm guessing he'll see about a 50hp increase.

I think it all depends on how worn each set of blowers are...

03-23-2016 | 12:07 PM

#22

Hopper

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From: Peterborough Ontario

Thanks for the input from everyone like i said.... they are going to be better then the 177's I will re post if there is any mph increase and if there is how much..

03-23-2016 | 12:36 PM

#23

Griff

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From: Omaha/LOTO

Quote:

Originally Posted by Hopper

thanks for wrecking my fantasy Griff LOL... I agree with you the more I think about it... do you think 7lbs of boost would be ok on those engines??

What is your static comp ratio???? If its more than 8.5 then 7# may be too much boost on pump fuel.

Good info here http://documents.holley.com/techlibr..._tech_info.pdf

03-23-2016 | 04:17 PM

#24

Hopper

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From: Peterborough Ontario

it's 8.5 Griff... thx for the info

Quote:

Originally Posted by Griff

What is your static comp ratio???? If its more than 8.5 then 7# may be too much boost on pump fuel.

Good info here http://documents.holley.com/techlibr..._tech_info.pdf

03-23-2016 | 04:51 PM

#25

getrdunn

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From: NW Michigan

One way to find out is when you get them installed and on the water. Like you said either way you'll definitely have more power regardless. With your other package you were done maxed out so your heading in the right direction regardless.

03-23-2016 | 08:44 PM

#26

MILD THUNDER

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From: chicago

I've had 177's, 250's, and 420's, on my 454's. The 250's, are a nice upgrade over the 177's.

With 6lbs of boost, you'll be even cooler air temp, than those 177's making 4lbs. 2 more lbs of boost, little cooler air charge, I'd think 50-75hp is within reason.

03-23-2016 | 08:58 PM

#27

phragle

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From: Toledo Oh

Quote:

Originally Posted by Hopper

I know that was my original plan... but the boat is in storage I need to get it out get them swapped before I commit on selling 1 to you just to ensure I have no issues.. do you need the carb and intake as well? they were all just rebuilt 20 hours on them..

Pm me a price for a complete setup and complete minus carb as well as a timeframe and we can go from there...