2.5 Tuner questions

[fastcat]

I this the right tuner for a ros 280 2.5?

Or is it a tuner for a 260?

Which is better for my ros 280s on a twin cat?

[Jay Smith]

It is a tuner off a 1992-1993 2.5 260 HP EFI engine ! It will work fine on your 280......It is a progressive rectangle and I prefer it ( the one in your picture ) to the oval because Mercury did a crappy job transisitioning from the rectangle of the tuner adapter to the oval tuner , they tryed to do it in less than an inch and it distrubs the heck out of the flow and without a bunch of grinding at 1 " above and 1" below the flange fit the oval will NOT out perform the one in the picture !

From my experiences.....

[fastcat]

Thanks for the info Jay.

[steve]

The only thing else you may want to do is drill a 1/2" hole on each side of the tuner a few inches down from the flange and on the outside. The 280's have that so that the tuner does not load the motor up as much if the horn opening has water covering it.

[Raceman]

The only thing else you may want to do is drill a 1/2" hole on each side of the tuner a few inches down from the flange and on the outside. The 280's have that so that the tuner does not load the motor up as much if the horn opening has water covering it.

Hahaha, I did that to the tuner in a champ mid section on a 15 Ally in the 70's because it didn't want to get on top and Merc's just now gettin' around to it.:confused:

[150aintenuff]

guess ya should have patented it raceman.. merc could be payin you fer the technology :p:p

[steve]

And they probably charge $50 to drill the holes. I think I might just look up the part numbers out of curiosity to see how much those holes are costing everyone.

[Jay Smith]

HUM , I've been drilling those 1/2" holes 1" below the flange ( but at an angle ) for 14 years...... You might can see them on my website on drystacking atricle Greg did on S & F several years back ! Ain't Rocket science .......;)

Good luck !

[Raceman]

Hahaha, I did that to the tuner in a champ mid section on a 15 Ally in the 70's because it didn't want to get on top and Merc's just now gettin' around to it.:confused:

HUM , I've been drilling those 1/2" holes 1" below the flange ( but at an angle ) for 14 years...... You might can see them on my website on drystacking atricle Greg did on S & F several years back ! Ain't Rocket science .......;)
Good luck !

Only 14 years Jay?????? So you're admittin' you copied me too:eek: You tuner splasher you.:( I'll include you in the infringement lawsuit unless you admit right now that you learned everything you know from me.:p

[Jay Smith]

Ok Norris now that you have exposed me as the villionous tuner splasher that I am :eek: :p ;) have a HAPPY HOLIDAY SEASON !:D

PS Hopefully we can settle out of court !

Jay and Cathy Smith @ JSRE

[150aintenuff]

it is interesting tho that it took merc that long to make the switch though..

[T-REX]

it is interesting tho that it took merc that long to make the switch though..

Hell, Mercury wuz skeered to take Racemanz ideer...Racemanz got Mo Money than they do :eek: :eek: ......

Jay don't kare....He kin hide in tha grass :rolleyes: :rolleyes: :p :p :p

[150aintenuff]

good one rex...... said like a pro...:p:p



the faster my parts get her the faster my boat will run..