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trainfan1 trainfan1 is offline
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First recorded activity by BoatBanter: Jul 2006
Posts: 194
Default Q-Jet tuning help (performance Merc 5.7)

Rainmann wrote:
Greetings,

I am in the process of rebuilding both of the Merc 350's in my boat.
I have added some performance mods, so I know I will most likely need
to re-jet my Qjet carbs. I am seeking some advice for a good starting
point on the jets. Below is a list of the high performance add-ons.
Thanks!

Qjet 17059280
Edelbrock performer intakes
MSD everything
Comp roller rockers (1.52)
Comp Extreme Marine cam 262/268, .462/.477
Tuned GLM manifolds, open exhaust
K&N flame arrestors

Not real screamers, but should have significantly more performance
over stock. Any advice will be greatly appreciated! thanks

--Ray


Carb tuning is a long-lost art.

Your cam specs(thanks for staying w/ the Marine/RV grind) staying under
..5, you may be surprised that not much adjustment is needed.

Rob