500efi with blower shop 250s

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08-11-2016, 08:51 AM

#11

mike tkach

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what brand of boat is it?i,m thinking it must be a cat.

08-11-2016, 09:40 AM

#12

JimmyS

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Quote:

Originally Posted by Kichler

1250cfm quick fuel, I've tried putting my motors up for sale and can't seem to give them away and they are spotless low hour fresh water motors with ecms tuned by mark boos. So I guess I'll just make them the power level I want for a cheap price of the blower setups I can buy.

Not sure what your price point for considering "giving them away", but I'd be interested as I'm at the junction of rebuilding my 454 Mag EFI's or just buying a pair of motors to re-power.

Thanks,
Jimmy

08-11-2016, 11:10 AM

#13

Ran-Dom 32

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Quote:

Originally Posted by mike tkach

what brand of boat is it?i,m thinking it must be a cat.

boat is a '99 AO 31 Cat

08-11-2016, 04:13 PM

#14

Kichler

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Quote:

Originally Posted by JimmyS

22k less headers

11-27-2016, 09:41 PM

#15

stokes0786

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Interested in the intake setups

11-30-2016, 07:34 AM

#16

SecondWind

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Quote:

Originally Posted by Kichler

Just would like to here real world experience doing this. Or would just doing Heads and better cams be a better route. Boat is running 95mph with stock 500efis so the 100+ mark is the goal.

Several years ago we had a friend at our local lake in central IL pick up a 38 Fourntain w/ carbed 500s that the previous owner installed 250s on (single carb blower setup). The new owner didn't get to enjoy the boat for very long before the engines stopped. I'm not an engine expert and understand proper setup is key but I remember the conclusion of the problem was one carb and not good fuel distribution to all cylinders causing certain cylinders to run lean. I'm sure the setup can run well with the proper guidance but you asked for real world experience. Good luck, your cat should really wake up with some huffers!

11-30-2016, 09:55 PM

#17

SecondWind

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How about Prochargers for the 500efis? Did anyone see or read about Paramount race boat winning 2016 Carib Great Race? Steve Morris converted 600 cube motors from carbed 14-71 blowers to fuel injected Prochargers and power went from 1100 to 1800hp per motor??? They then when on to win brutal 90 mile offshore race, damn!

12-01-2016, 10:20 PM

#18

endeavor1

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Offshore excursion had good luck on 500efi motors in his 33 OL. My m3sc's were carb box setup on 555s. Had to weld a dam in the inlet to redirect air as it would cancel signal to the front right Venturi. Ended up back NA. When it ran it really ran though

12-05-2016, 08:07 AM

#19

mcprodesign

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Quote:

Originally Posted by Kichler

Hey guys just wondering your thoughts on putting blower shop 250 kits on my 500efi motors and going to single dominators. I have a line on a cheap set of brand new blower shop 250 kits. Just wondering what are your thoughts and what all it will require for the swap. Thanks

I have the blower shop 250 kits . They are really good. I run 2 throttle bodies on top them. So I can say if a single carb is good or not. On another boat I had a 510 with a b and m blower. Single dominator. Ran great. Great MPG. But no top end really.. Was great out of the hole though. If you want top end you need 2 carbs. The 250 series blowers like intercoolers, cause they make a lot of heat. I have the Teague super chillers. Without EFI, you need to run completely separate plumbing so they only work as you go .