Offshoreonly.com - this really sucks?

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Fountain (https://www.offshoreonly.com/forums/fountain-37/)

- - this really sucks? (https://www.offshoreonly.com/forums/fountain/125107-really-sucks.html)

blume

03-17-2006 01:10 PM

Re: this really sucks?

Quote:

Originally Posted by briana

on 35 1998 lightning iam very unhappy with the performance after my engine upgrade this is why.

before the upgrade with 1998 tired motors one motor had 90 compression on 2 cylinders the boat ran 72.1 gps full fuel,2 people, spinning 26 hydromotives @5000 rpm wot.

the upgrade was asm, new upgraded crane cam, dart heads, msd ignition, roller rockers, cmi exhaust and a computer reflashing. cost of parts was approx 18,000.00.

heres what the performance is now(it sucks)
between 1/2 and 3/4 fuel,2 people, 26 hydromotives compression is back to 150+ on all cylinders. boat ran 74.4 gps @5000 rpm
water and wind were the same before and after.

the only thing i did not do was change the intake to get more air into the motor. do you guys think this is hindering the new heads and cam from working properly ie creating more hp?

with stock 502efi's 415HP the boat new ran 75 to 77mph

briana

03-17-2006 01:16 PM

Re: this really sucks?

The Report From The Factory Says 76 Mph Found This In The Owners Manual With My Hull # And Wind Condition, Time Of Year, Air Temp And Humidity.

Rebel_Heart

03-17-2006 02:48 PM

Re: this really sucks?

My report said 75 mph. Our drive heights must be about the same.

BAJA WILL

03-17-2006 03:51 PM

Re: this really sucks?

I second the idea of putting less prop on and turning higher rpms!!!! Until you spin over 5000rpm I think the rev limiters are stuck, just my 2 cents,

WILL :drink:

briana

03-17-2006 04:52 PM

Re: this really sucks?

rebel heart, what is your drive height, I dont have that info on mine.

louietherigger

03-17-2006 05:47 PM

Re: this really sucks?

have you run a straight edge on the bottom? check with JC performance he can tell you whats wrong if you give him the build specs.

louietherigger

03-17-2006 05:50 PM

Re: this really sucks?

PS also allways dyno you spent a lot of bread another grand at most you could have played with them on the dyno. we found another 50 hp on a 900hp playing with jets, plugs and timing

Pure Energy

03-17-2006 06:20 PM

Re: this really sucks?

hmmmm, I'll throw out a thought from experience. Did your mechanic actually do the work he said??? Lots of unsavory mechanics out there. Trust me, I think I found them all!!!

BGIII

03-17-2006 06:34 PM

Re: this really sucks?

I would verify timing first and then take a careful look at the fuel system.

snielsen

03-17-2006 07:30 PM

Re: this really sucks?

THROW IT IN THE WOODS......then you wont have so much stress :D

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