15 400R news

**JPEROG** · 03-05-2015, 10:09 PM

Dale,

you have to admit that the outboard boat is much more simple and a more user friendly boat overall.

Joe

**Rayzor** · 03-05-2015, 11:59 PM

Originally Posted by JPEROG

Dale,

you have to admit that the outboard boat is much more simple and a more user friendly boat overall.

Joe

Absolutely Joe, that's why I use my 28 a lot more than my 30. And I try and talk every friend I know out of buying a 30'+ inboard boat because the entire experience is not as enjoyable as the 30' and under outboard boats. Ron and I have talked, and we've agreed that for his situation the outboards are definitely the way to go. I'm lucky also that even though I take my 30 to the salt every time I take it out, I run it back through fresh to my house (which is fresh, and why I was saying it's no big deal for me to wipe down my motors). If you leave and return in salt, the outboards are much easier to flush and deal with than the inboards with outdrives. Trust me, if the water behind my house ever becomes salt (which with our changing climate could happen), I will only own outboards down at the dock. A DW32 w/ twin 15" 400Rs would probably be the replacement for my 30 - not near as fast or quite as nice in the rough, but what a great boat!

**Scream And Fly** · 03-06-2015, 01:54 AM

Originally Posted by WILDMAN

I may want to put one on a 21 Checkmate or a 21 Liberator. The Checkmate runs 98 (with me driving) and the Liberator runs 105-108 with a 300xs. Actually, the 30 Liberator would be a perfect boat to put a pair on!

Randy, I hope you'll call me when you do this.

**MODVP22** · 03-06-2015, 08:22 AM

Originally Posted by Scream And Fly

Randy, I hope you'll call me when you do this.

Twins on a 30' Checkmate???? That could be cool

**baja200merk** · 03-06-2015, 08:37 AM

Originally Posted by WILDMAN

Yes they are 1.75, but I heard they turn 7000 rpm

1.75 @ 7k is still slower then 1.62 @ 6500

**Captin Hazlewood** · 03-06-2015, 09:25 AM

Originally Posted by baja200merk

1.75 @ 7k is still slower then 1.62 @ 6500

actually 7k/1.75 = 4000 rpm propshaft & 6500/1.62 = 4012 rpm propshaft

so you are correct by 12 rpm, however my stock 300XS shows max rpm 6400 on the serial number decal, or 6400/1.62 = 3950 rpm.
So the Propshaft speeds are actually very similar.

**Jamescole** · 03-06-2015, 11:02 AM

Originally Posted by NAVISPEED1

Any interest in a set of 200xs's?????

Yes...

**Jamescole** · 03-06-2015, 11:04 AM

Tuff marine is putting Two 400's on a tuff 28... should be awesome

**powerabout** · 03-06-2015, 12:17 PM

remember the old days..
there goes the market for a 400trs, lol

**MODVP22** · 03-06-2015, 01:29 PM

Originally Posted by WILDMAN

400 hp is alot out of a 2.6 litre motor!

Wilman brings up a good point here. That's quite a bit for 2.6 litres being supercharged and all. Wonder what the longevity would be

**Revolution141** · 03-06-2015, 04:06 PM

Originally Posted by Captin Hazlewood

actually 7k/1.75 = 4000 rpm propshaft & 6500/1.62 = 4012 rpm propshaft

so you are correct by 12 rpm, however my stock 300XS shows max rpm 6400 on the serial number decal, or 6400/1.62 = 3950 rpm.
So the Propshaft speeds are actually very similar.

Don't forget a 300xs makes peak hp at around 6050rpm. Spinning it past there and your losing hp. Even DBR's upgraded 300's with raised rev limiters drop hp after 6050rpm same as stock (it's simply to allow you to run smaller props for hole shot in a short drag situation then have a buffer to let it keep winding out near the finish).
I have no idea where the 400R makes peak power but considering they are electronically boost controlled I'd imagine they could potentially hold peak hp over a broad rpm range!? This gives them the advantage of being able to spin larger pitch props down low and still reap the benefits at higher rpm. Would be good to see a dyno print out for one!
My buddies 350 verado seemed to like to hold around 6600-6700rpm a lot.?

**Rayzor** · 03-06-2015, 04:45 PM

Originally Posted by Revolution141

Don't forget a 300xs makes peak hp at around 6050rpm. Spinning it past there and your losing hp. Even DBR's upgraded 300's with raised rev limiters drop hp after 6050rpm same as stock (it's simply to allow you to run smaller props for hole shot in a short drag situation then have a buffer to let it keep winding out near the finish).
I have no idea where the 400R makes peak power but considering they are electronically boost controlled I'd imagine they could potentially hold peak hp over a broad rpm range!? This gives them the advantage of being able to spin larger pitch props down low and still reap the benefits at higher rpm. Would be good to see a dyno print out for one!
My buddies 350 verado seemed to like to hold around 6600-6700rpm a lot.?

What you are saying is not true about the DBR modded 300XS. I am on the DBR 300XS raised rev limiters (6,600) w/ 34s - went to 36s and the rpm dropped to 6,100 and I lost speed (boat is 3mph faster at 6,600 w/ 34s). I would agree with you on a stock 300XS, but with all the DBR mods on my 300XSs (ECU programs, intake rings, 300X cowls, flywheels and tuners w/ 15" open exhaust mids), I have found this to not be the case. I have a set of 35s I haven't run yet, but I'm guessing these will be the fastest props at right around 6,500 rpm. As we all know, some of that speed/rpm difference could have been in the props themselves (both Dewald 4 blades), as no two sets of props are exactly the same - especially in dissimilar pitches. All I can tell you is that my 28 Skater accelerates better and is faster on top with props that spin 6,600 rather than 6,100 - and if the hp is falling off after 6,050, this wouldn't be the case.

**powerabout** · 03-06-2015, 05:07 PM

Originally Posted by Rayzor

What you are saying is not true about the DBR modded 300XS. I am on the DBR 300XS raised rev limiters (6,600) w/ 34s - went to 36s and the rpm dropped to 6,100 and I lost speed (boat is 3mph faster at 6,600 w/ 34s). I would agree with you on a stock 300XS, but with all the DBR mods on my 300XSs (ECU programs, intake rings, 300X cowls, flywheels and tuners w/ 15" open exhaust mids), I have found this to not be the case. I have a set of 35s I haven't run yet, but I'm guessing these will be the fastest props at right around 6,500 rpm. As we all know, some of that speed/rpm difference could have been in the props themselves (both Dewald 4 blades), as no two sets of props are exactly the same - especially in dissimilar pitches. All I can tell you is that my 28 Skater accelerates better and is faster on top with props that spin 6,600 rather than 6,100 - and if the hp is falling off after 6,050, this wouldn't be the case.

might not agree with that 100%, low drag hulls will always go faster when propped past peak power
Its how long it carry's that power after peak and how fast it drops is the issue/skill in the engine design

**Rayzor** · 03-06-2015, 05:29 PM

Here's why I say the DBR 300XS has more power at higher rpm than the stock 300XS. My 21 Trick with stock 300XS went a best of 106 at 6,100 w/ a 32 pitch Blaster and a best of 102 at 6,300 w/ a 30 pitch Blaster. This proves the motor was making more power closer to 6,000 than 6,500, or it would have spun the 30 up higher. Yet on my 28 w/ the DBR modded XSs, it is faster when propped to run at 6,500. I understand what you're saying, and I agree with you to an extent - but owning both stock and modded XSs and seeing the difference in the best rpm/top speed combinations leads me to believe that the DBR mods help the XS continue to make more hp past where the stock ones do.