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Old 26 November 2007, 10:07   #21
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Remember the 175 Suzuki is a 150 with more radical cams...

Effectively the 175 uses its variable valve timing mechanism to tame the cams at lower rpm to enhance the torque curve (which without the vario would be a typical "screamer" type high lift cam affair) then by 5500rpm the vario bit is fininshed and the cams can liberate your full 175hp.

I actually bought the DF150 for two reasons:
Firstly the 150 does not have the vario stuff so the cams are optimised for a broad torque curve with the peak hp (150) being their natural limit - IMO the lower end torque will always be better (higher) with a properly specced and matched set of camshafts than with a radical higher lift set which are then manipulated to enhace the lower end curve...

Secondly the extra 25 hp is only there after 5500rpm which in reality I don't breach that often since on my 6.5m I find the ~45mph @ 5500rpm tends to be a little uncomfortable for my passengers and the top end of 51mph @ 5900is plenty....

The boat tests on the Suzuki site do point towards their being little practical difference between the performance of the 150 and 175....

Personally I think the 3.6l 200 is overkill on a 6.5m rib, too heavy and probably too much torque - can't believe I just said that
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Old 26 November 2007, 14:43   #22
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TNDB: What boat is your DF150 fitted to?
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Old 27 November 2007, 06:36   #23
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Quote:
Originally Posted by Downhilldai View Post
TNDB: What boat is your DF150 fitted to?
Rib X 640
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Old 27 November 2007, 12:20   #24
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I drove a 150 Vipermax and it seemed really well balanced, but hey, if the 200 gives you a bigger stiffy then go for it
Hi all, long time no comment from me.

Stu, was that my boat? She was only 6m, i reckon a 6.5 would be nice with a 200.
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Old 27 November 2007, 12:31   #25
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Hi all, long time no comment from me.

Stu, was that my boat? She was only 6m, i reckon a 6.5 would be nice with a 200.

Yes it was!

HI Ya buddy
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Old 30 November 2007, 11:21   #26
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Hi,
I recently went through a similar scenario. I couldnt decide between a Suzuki 175 and 200 to put on the back of an xs 650.

I eventually decided on the 175 as i was recomended to add a second axle to the trailer. For the amount of time spent at wot, extra fuel cost, and extra cost in services etc. Idecided that the 175 would suit.

Dont get me wrong, i was very tempted by the 200 given the extra power if needed and the difference in purchase price was not much. Sadly comon sense and pressure from the boss (wife) got the better of me.

There was a report in Rib international on the Solent rib 6.5m with a suzuki 175 on the back the figures appeared as;

3k rpm - 18kn
4k - 29.12
5k - 36.97
6500 - 47.95

Zero to 30kn 8.5 seconds

Unfortunately there were no fuel consumption fig's

(I know its not the same boat before i get shot down )

I am still awaiting delivery of our boat and sorry i cant be any more help.
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Old 30 November 2007, 15:16   #27
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Hi K&S, and thanks for your comments.

I have been out for a test drive on a Solent 6.5 with a suzy 175. I saw 42knots come up on the gps, but we weren't going for max speed, so there was probably more available in the right conditions. I also think the Solent is lighter than the Vipermax.

Last week I was convinced I was going for the 175. This week I'm back to the 200. The price difference is neither here nor there out of 20k+, but it's the weight and fuel consumption that I'm trying to balance, along with speed.
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Old 01 December 2007, 02:36   #28
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Hi K&S, and thanks for your comments.

I have been out for a test drive on a Solent 6.5 with a suzy 175. I saw 42knots come up on the gps, but we weren't going for max speed, so there was probably more available in the right conditions. I also think the Solent is lighter than the Vipermax.

Last week I was convinced I was going for the 175. This week I'm back to the 200. The price difference is neither here nor there out of 20k+, but it's the weight and fuel consumption that I'm trying to balance, along with speed.
Hi

My average fuel consumption is 1L = 1 mile with a 200 opti and I'm not soft on the throttle
I've also got a 15 2st aux on the back so I'd forget about the weight
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Old 01 December 2007, 04:25   #29
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The fuel consumption difference will also be 'neither here or there' or the weight. Your dilly dallying over the price of a bag of chips. All engines around that size do roughly 1ltr/Nm and if your too hung up about weight the mother in law will never get a trip out. Get the thing bought.

I'm about to hang a 263kg engine on a Vipermax only 500mm longer than yours.
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Old 02 December 2007, 08:00   #30
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to be fair, i agree with Mr Mollers. A few Kg, same a a bit of fuel or an extra person. Consumption? My 150 did 1li/mile, my mates 200 did the same when we travelled together (IE same sea state, same speed etc.)
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