Nor-tech 340 vs 390
04-03-2018, 12:34 PM
#31
Registered
To each their own as we all value certain options, performance and our investment differently.
I've yet to hear anyone claim a quad 39 capable of 90mph. My guess is more like 85mph.
I would say the length, weight & CG of the 39 overcome the lift.
1050 h.p. behind a 34' boat trimmed up so that's allot of leverage coupled w/ the air trapped under the top in front of the windshield.
IMO 1200 h.p. or 150 h.p. more behind a 39' boat that weighs more doesn't have the ability to get the same lift.
I also don't believe the large top affects or contributes to the lift, it's the air that is stacked up under the top at the windscreen that causes the lift. The shape is the same regardless of whether you opt for standard or large top.
The large top is beneficial if you opt for 2nd row seating on a 39. Better wind / weather protection for more passengers.
We had 4 on board returning from the Bahamas in 4-5 footers w/ rain and whoever sat on the cooler behind the helm got drenched w/ the rain that rolls off the backside of the standard top.
I've yet to hear anyone claim a quad 39 capable of 90mph. My guess is more like 85mph.
I would say the length, weight & CG of the 39 overcome the lift.
1050 h.p. behind a 34' boat trimmed up so that's allot of leverage coupled w/ the air trapped under the top in front of the windshield.
IMO 1200 h.p. or 150 h.p. more behind a 39' boat that weighs more doesn't have the ability to get the same lift.
I also don't believe the large top affects or contributes to the lift, it's the air that is stacked up under the top at the windscreen that causes the lift. The shape is the same regardless of whether you opt for standard or large top.
The large top is beneficial if you opt for 2nd row seating on a 39. Better wind / weather protection for more passengers.
We had 4 on board returning from the Bahamas in 4-5 footers w/ rain and whoever sat on the cooler behind the helm got drenched w/ the rain that rolls off the backside of the standard top.
04-03-2018, 03:49 PM
#33
Registered
Yes, we all know about the impressive 100mph NT CC record but lets face it no Nor-Tech Center Console comes w/ jack plates nor are they even listed as an option. They also don't come with or recommend 5 blade props either. Just the ones I mentioned previously. I'd sincerely like to hear from the owner of a stock production quad 400 NT-390 owner to see what speeds they see in real boating conditions. Hey, I may have under estimated the top speed of quad 400's but I still don't think it's 90mph. Maybe 88mmph since they typically only gain 5-6mph adding an engine and Trond states the boat they are running tops out at 82. Splitting hairs at this point.
04-03-2018, 03:50 PM
#34
Registered
I agree with Nascat that twins likely restrict your resale market. I would never do twins if I was running offshore, just because I would want 2 engines left to get home if something happened to one. That's not an issue on LOTO where you are never more than a few miles from some marina.
04-03-2018, 07:55 PM
#35
Fast Priorty II Nor-Tech
Platinum Member
I definitely wouldn't tune the 350 and void warranty!!
And my question of timing is exactly because of the rumor mill of potential 500s being released. I think a trip 500 39 would be ideal! In fact would even lead me to hesitate starting my build too soon because of it.
Are the 39's with trip 400s experiencing the same lift from the hardtop when in 80mph range as well? Assuming a quad 400 boat definitely feels the effects of lift if they are in the 90mph range. Also, I would likely go with standard hardtop version but, is there anyone with the extended top who's complained of tincreased kite phenom?
And my question of timing is exactly because of the rumor mill of potential 500s being released. I think a trip 500 39 would be ideal! In fact would even lead me to hesitate starting my build too soon because of it.
Are the 39's with trip 400s experiencing the same lift from the hardtop when in 80mph range as well? Assuming a quad 400 boat definitely feels the effects of lift if they are in the 90mph range. Also, I would likely go with standard hardtop version but, is there anyone with the extended top who's complained of tincreased kite phenom?
04-04-2018, 06:55 AM
#36
Registered
Sobo ran mine with 300s, new, very little gas and 2 people in the boat to 66. With a few hundred gallons of fuel and 2 or 4 people at 660 ft above sea level at LOTO it runs 60. Terry told me the 350s would add 5mph. I will let you know later in May what the twin 400s will do. Merc has them scheduled for May 14 delivery. And maybe later tune them to 450s.
I agree with Nascat that twins likely restrict your resale market. I would never do twins if I was running offshore, just because I would want 2 engines left to get home if something happened to one. That's not an issue on LOTO where you are never more than a few miles from some marina.
I agree with Nascat that twins likely restrict your resale market. I would never do twins if I was running offshore, just because I would want 2 engines left to get home if something happened to one. That's not an issue on LOTO where you are never more than a few miles from some marina.
04-04-2018, 09:08 AM
#37
Registered
04-04-2018, 10:14 AM
#39
Sobo ran mine with 300s, new, very little gas and 2 people in the boat to 66. With a few hundred gallons of fuel and 2 or 4 people at 660 ft above sea level at LOTO it runs 60. Terry told me the 350s would add 5mph. I will let you know later in May what the twin 400s will do. Merc has them scheduled for May 14 delivery. And maybe later tune them to 450s.
I agree with Nascat that twins likely restrict your resale market. I would never do twins if I was running offshore, just because I would want 2 engines left to get home if something happened to one. That's not an issue on LOTO where you are never more than a few miles from some marina.
I agree with Nascat that twins likely restrict your resale market. I would never do twins if I was running offshore, just because I would want 2 engines left to get home if something happened to one. That's not an issue on LOTO where you are never more than a few miles from some marina.
04-04-2018, 02:56 PM
#40
Registered
Thread Starter
Spoke to one of the guys from the dealer who drives these boats all day long. He said the quad boat is a novelty and would not recommend it. Also said the performance, handling and ride of the 39 changes drastically (inferiorly) with quad 400s and says the absolute best package is trip 400s, unless it's a 392 fully rigged*. He did go on to say that quad 400's will get you to around 90 and the 39 can definitely take it and actually maintains great stability but, those opportunities in the ocean/icw are few and far between that the compromised handling 99% of the remaining time is not worth it.
So, I think i'm going to go trial a 39 with trip 400s at some point in the near future. Between 34 trip 350 vs 39 trip 400s at this point. If merc does come out with 500's I'm sure many many people will want to upgrade their current 300 Verado boats with 400's, allowing for a similar move from 400--> 500 on the 39. That would be a sweet set up.
Who knows, I may share the same sentiment as Erik1976 and not really enjoy the larger 39 and opt for the 34. Thanks for all the advice.
So, I think i'm going to go trial a 39 with trip 400s at some point in the near future. Between 34 trip 350 vs 39 trip 400s at this point. If merc does come out with 500's I'm sure many many people will want to upgrade their current 300 Verado boats with 400's, allowing for a similar move from 400--> 500 on the 39. That would be a sweet set up.
Who knows, I may share the same sentiment as Erik1976 and not really enjoy the larger 39 and opt for the 34. Thanks for all the advice.
