Offshoreonly.com - Whipple 600sci upgrade documentation

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Quote:

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

Yes! I was wondering about that myself

Quote:

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

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.

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.

Quote:

Originally Posted by Beak Boater (Post 3000773)

u could afford to loose a couple pounds.:lolhit:

Quote:

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

Another weak link is the prop hub you have to use in order to run the #6 props... I know of a few people who have spun prop hubs on NXT's.

Also, with all of the different stages, does the Merc smartcraft/race view still work?

Merc smartcraft/race view still works.

Chris

Quote:

Originally Posted by Whipple Charged (Post 3000683)

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)

Quote:

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

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

Quote:

Originally Posted by Beak Boater (Post 3000773)

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

Quote:

Originally Posted by gnorthga (Post 3000919)

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!