My 260 powerhead has 1" spacer on the horn and 34 cc heads. I'm have the choice of tuners to install one is the stock tuner for it and the other is the one in the pic. The guy says it's a diamond marine tuner. My drawing skills suck but this is the basic shape of it. Witch one should I get
What tuner to use
- Thread starter David B
- Start date
JGH
Member
The drawing looks nothing like the tuner Diamond Marine sells on their site.
What midsection are you running?
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JGH
Member
Is this what yours looks like? If so, its a Mad EFI tuner or a copy.
JGH
Member
I'd go with stock. The Mad is designed to blow straight out the back of an offshore 15" mid, I don't think it would work to well for you. I don't like them even with a 15 mid.
The stock tuner can be modified for a little more top end HP.
JGH
Member
Shortened and offset lengths and a few other mods I don't want to give away. Go to Diamond Marine's web page and read the description of their tuner, it might give you some ideas. Jay Smith did mine when he dry stacked it. I've attached a generic photo I found with google to give you a general idea. You might lose some low end, nothing's free.
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JGH
Member
JGH
Member
David-
I don't know how long the stock tuner is. The factory staggers the sides by ~ an inch (starboard side shorter). Jay staggered mine mine by ~1.5". Overall length varies by where in the rpm range you are trying to improve. The 2.5 Drag motor tuner is ~7.5" long, but that's a 10,000 rpm motor.
I can't tell you how much to shorten it, you'd have to decide. Since you fish and probably carry a load, you may not want to shorten it.
Most importantly, match the ports on exhaust plate, gasket and pan to the motor and the tuner to the plate.
PM sent.