ckentling

A friend installed super chillers on his boat over the winter and now seems ot have lost quite a bit of speed.

I have yet to get out on the boat to verify, but from the callI received last night, I thought I would post here and see if anyone had ideas to look at

twin step Donzi 38 zx poker run
expension boxes
XP drives
teague chillers
575SCi
32 P merc 4 blades spinning in
transom water pickups for chillers
side water dumps

he says it runs and pulls strong, last year this combo sans chiller ran best of 82, yesterday (62, light chop, fresh water) it ran 72 @ 5100 RPM

he said it felt right and like the boat was hooked up, and tabs / drives were were they alwasy are (he has owned this boat 3 seasons)

Any help would be appreciated

Thanks

Christian

ckentling

sorry, thought of that after i posted

5100 RPM

He bought it all from Teague

Steve Zuckerman

Sounds like it's stuck in "cold start" mode. Early season, cold water, cold air through the intercooler, and these motors are already AFR fat/rich from the factory.
EB Marine here in Nashville has reprogrammed several 575s, including mine, and should have an ECU curve for your friend's boat. I would give Eric a call. 615-714-2944, Monday through Saturday.
Regards,
Steve

Young Performance

The engine will also lose at least a pound of boost with the addition of the intercooler because of the restriction of the intercooler fins. I have seen some lose 2 pounds or more.
Eddie

racinfever

32s 5100= 89 mph check your gps

29Fever575sci

Did he change anything else? 5100 before and 5100 after should equal the same speed with the rest of the boat being the same.
The ECU does need to be changed. Mine has the Whipple intercooler and Dart heads, 5500=703hp. Tuning with a O2 bung in the header is the way to go and get it dialed in.

BUIZILLA

how fresh was the fuel?

and from where?

BDiggity

How much weight did G pack on over winter?

tunertech

cooler air density has changed in the intake resulting in richer charge as well as mild restriction

Griff

Agreed......... assuming he did not change props.

The problem may be the location of the chiller water pick ups. Aerated water could be causing prop cavitation and higher propslip numbers.