Originally Posted by CB-BLR (Post 2997105)

Yes.. 10-12 lbs with the stage II upgrade.

Chris

Originally Posted by sport (Post 2997557)

is'nt that a lot of boost even for a 7.5 comp. engine on pump gas? how much boost did the stage 1 have?

Originally Posted by sport (Post 2997977)

Why is it that a 525 with a whipple can make 775hp with only 7 psi of boost and a 600sci needs 10-12 to make 750hp? I realize that the 525 has a little more comp. and a little bigger cam. In an old boat i had with a 509 and roots type blower on pfaff's dyno at 7.5 psi of boost it made 844hp and with 8.5 psi it made 868hp it had the same cam specs. as the 525 and had brodix heads with 8.3 comp.. I'm not trying to secound guess any one but that still sounds little a lot of boost. My new nordic 28 is being built with the 600sci and i know i will need more power when the warranty is up but i don't think i would fill good about running that much boost on pump gas. How much boost does the 700sci have to make 700hp? The cam is only slighty bigger in the 700 over the 600.

chris and eddie thanks for all the info

Originally Posted by aTX427 (Post 2998782)

the 600 / 700 is way detuned. How about the NXT trans? What are they rated at and are they breaking? I have only heard of two; one being driver error and the other was in a cat that is run hard in rough water - never heard the real deal on why it broke.

Originally Posted by Jassman (Post 2998817)

approx 800 hp/tq.. the Merc 700 which is rumered to put out 750-770hp is max on that drive... they were designed for this purpose only.. gap between #6 and the bravo.

Originally Posted by gnorthga (Post 2998943)

I WOULD LOVE TO TALKE TO THAT GUY

ARE YOU SURE YOUR NOT A SALESPERSON (for dustin) LOl

Originally Posted by Jassman (Post 2998817)

approx 800 hp/tq.. the Merc 700 which is rumered to put out 750-770hp.

Originally Posted by Beak Boater (Post 2999118)

:cool-smiley-011::cool-smiley-011:Not doubting you but what is Dustins stage II upgrade putting out then for the 700 sci? I thought it was around 800 hp. I'm sure he is making more than 50 hp with the ecu and pulley change.

Originally Posted by sport (Post 2997977)

Why is it that a 525 with a whipple can make 775hp with only 7 psi of boost and a 600sci needs 10-12 to make 750hp? I realize that the 525 has a little more comp. and a little bigger cam. I'm not trying to secound guess any one but that still sounds little a lot of boost. My new nordic 28 is being built with the 600sci and i know i will need more power when the warranty is up but i don't think i would fill good about running that much boost on pump gas. How much boost does the 700sci have to make 700hp? The cam is only slighty bigger in the 700 over the 600.

chris and eddie thanks for all the info

Originally Posted by gnorthga (Post 2998950)

Were are you getting your data

Originally Posted by Whipple Charged (Post 2999301)

Stage 2 is a conservative 830hp.

The only weakness in the NXT is really the tranny. We've used one on a 632ci 1300hp engine for 2.5 seasons in a single 30' Eliminator V. Blew tranny in first few hours which was do to the shifting at 800rpm (yes it idles at 800). I installed a shift interupt and its made it ever since. Brings rpm to 200 during shifts. We've got hundreds of NXT's running 800+ with zero issues.

Originally Posted by Jassman (Post 2999342)

Brad from Mercury.. Trond and Terry from NorTech.. So Stay around the 800 mark or less... same as the stock 700 Merc's... on heavier and twin motored boats this is the max.. may be different on smaller and single applications like Dustin stated.. I'm going by a conversation as my boat was being built and I paniced when I saw the NXT transom assembly coupled to my 6 drive.. I was told leave it stock, and I wouldnt have a problem...No problems to date with appr. 120 hours

Originally Posted by gnorthga (Post 2999405)

Would you recommend a shift interupt to use on 700 NXT with one one of your upgrades?

we have 17x35 Harrings now what you think the rpms are going to come out to be

Originally Posted by Beak Boater (Post 3000773)

But typically dont you raise the rev-limiter to 5800 rpm with your upgrade? I am assuming that the torque management system is programed to protect the NXT trans. It can he a pain it the butt with a heavily loaded boat.

Originally Posted by CB-BLR (Post 2998900)

Getting a little off track here... but there is a twin-turbo Nordic Thor that is putting nearly 1400 hp thru an NXT, with no failures yet. I believe he has a BAM transmition waiting in the wings. The weak link on the NXT is supposedly the trannny.

Chris

Originally Posted by Whipple Charged (Post 3000683)

It already has one, shuts off 4 cylinders during the shift.

Stage 2 typically picks up 400-600rpm so in some cases, larger props work better. Also come on plane much faster with reduction of torque management so its not like before where they struggle below 3000rpm.

Originally Posted by sport (Post 2997977)

Why is it that a 525 with a whipple can make 775hp with only 7 psi of boost and a 600sci needs 10-12 to make 750hp? I realize that the 525 has a little more comp. and a little bigger cam. I'm not trying to secound guess any one but that still sounds little a lot of boost. My new nordic 28 is being built with the 600sci and i know i will need more power when the warranty is up but i don't think i would fill good about running that much boost on pump gas. How much boost does the 700sci have to make 700hp? The cam is only slighty bigger in the 700 over the 600.

chris and eddie thanks for all the info

Originally Posted by Beak Boater (Post 3000773)

But typically dont you raise the rev-limiter to 5800 rpm with your upgrade? I am assuming that the torque management system is programed to protect the NXT trans. It can he a pain it the butt with a heavily loaded boat.

Originally Posted by gnorthga (Post 3000919)

I think I am going to keep the same wheels, which will put less stress on the NXT set up.

After lots of back and forth conversation I beleave you have a great product for what you gain dollar for dollar
(MPH per dollar).

Mark at precision marine said it is a great value.
I trust him totally when it comes to advice about
re-programming

If this is such a bad set up why is no one coming out and saying they are having problems.
I would think now is the time (registered oso people with address and phone numbers we can verify)

Originally Posted by rmbuilder (Post 3000937)

The 600 SCI camshaft has become the point of greatest restriction at this point in the testing. The limitations of the 600 SCI camshaft is; compared to the 700 SCI, it has some 18⁰ less intake duration, .056” less lift @ valve (roughly 10%). That being said, the 700 SCI camshaft is significantly less aggressive than the 525 EFI. Cam selection for this series of engines was weighted with a bias toward warranty issues rather than performance.
The very short valve open time and limited valve curtain area builds manifold pressure disproportionately to rate of cylinder fill. In this instance boost is more a measure of restriction than a performance parameter. A swap to a less restrictive camshaft will increase power while decreasing boost relative to output.

Bob

Originally Posted by Beak Boater (Post 3000773)

But typically dont you raise the rev-limiter to 5800 rpm with your upgrade? I am assuming that the torque management system is programed to protect the NXT trans. It can he a pain it the butt with a heavily loaded boat.

Originally Posted by Whipple Charged (Post 3000944)

Yes, 5850. Yes its in there for protection for people who go right to WOT off idle, never recommended, no matter what

Originally Posted by CB-BLR (Post 3000838)

Merc smartcraft/race view still works.

Chris

Originally Posted by lavey jr (Post 3000997)

So everything will work the exact same and the screen will display all of the vitals through out the added rpm's? And the screen that shows each hour minute second at each rpm will go all the way up to 5800 rpm?

Originally Posted by Whipple Charged (Post 3000947)

I really don't know of anyone that's had any problems. We've had a few with water psi issues, but that was the same as stock. So there is no negative feedback to speak of.

Mark knows his stuff for sure!

Originally Posted by gnorthga (Post 3001061)

What kind of water pressure do you want to see

Originally Posted by aTX427 (Post 3001128)

I had big time water pressure problems with my boat in stock form. Dustin helpe me out BIG TIME. The engines would go into guardian mode intermitently throwing overspeed errors even through I was no where close to the rev limiters. Turns out, water pressure is a non-sticky code, meaining it does not show up as an error on the display or in the Freezeframe.

If the water pressure is not at least 20psi at 4,200 rpm's the engine limited power in guardian mode to 70%. Since the engine was still spinning around 4,000 rpm's when the engine issued the Guardian code, it would then issue an overspeed error (70% of 5,400 = 3,780). The next threshold is at 4,800 rpm's, where you need at least 28psi of water pressure, othewise the same probem occurs.

It took hours upon hours of data logging. Neither the dealer tech's nor the Mercury techs could find a problem. I would still be chasing this problem if it was not for Dustin. He calls me the next day and says it is water pressure. I opened up the water channel that feeds my offshore pickups and the problem is solved. The water flow is so good, that had to install pop-off valves that engage at 45psi to bleed of extra pressure, so I would not worry one bit about re-routing the intercooler pickup location in the system or increasing flow to the intercooler with a bigger feed.

Originally Posted by CB-BLR (Post 3001022)

Yes,

Chris