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Thread: 300R vs 300X
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06-08-2019, 12:23 AM #106Screaming And Flying!
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So a Monty 380v8 omc cost gives you how much spare cash to buy fuel compared with a 300R?
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06-08-2019, 08:35 AM #107
Stock powerhead with DBR ECU mods. I cut the front cowl instead of buying a new cowl. I don't have the version number, but it was programmed in October last year.
Here is the testing
5 different tests. My hole shot got worse after the flywheel, but the DBR pulled it right back in again. https://www.youtube.com/watch?v=seBUTvtgusE
DBR ECU change before and after. https://www.youtube.com/watch?v=PHNB1ZkSRzU&t=63s
On my boat it made a significant difference. My friend did his 250xs after seeing the results and it helped him as well.
I will post the data graphs later today when I get some time.Allison XB21 2+2
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davemvegas thanked for this postNew Canoe liked this post
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06-08-2019, 09:14 AM #1086000 RPM
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06-08-2019, 10:06 AM #109Screaming And Flying!
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06-08-2019, 12:18 PM #1106000 RPM
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Sorry, it’s going to take a lot more than EFI to make them even remotely comparable.
Just the idea being argued that a 35 year old modified 2-stroke is better than a modern outboard is what is stifling growth of this website. It’s sad to watch, honestly.Last edited by engineermike; 06-08-2019 at 12:20 PM.
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06-08-2019, 01:13 PM #111On my boat it made a significant difference. My friend did his 250xs after seeing the results and it helped him as well.
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06-08-2019, 03:08 PM #112
I think those might make just a little more ...
https://www.facebook.com/26293773058...6258988653281/
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06-08-2019, 05:32 PM #113
The XB21 Allison is the fat kid in the family. The hull alone is 1300lbs. For testing I ran full fishing load and power poles. On the water the boat weights just under 2,800lbs. I agree, the setup is still probably better setup to leverage the added power. I studied the DBR stuff a lot before I bought. Results were plus and minus. Mine ended up very positive.
Here is a test with the 30 Promax. The boat weight and setup was identical for all tests. The only change was the motor.
Stock 300XS 1.62 in Red
DBR 300XS 1.62 in Blue
DBR 300XS 1.75 in Green
Stock 300R 1.75 in Orange
The line marks the spot the data in the table is reading down below the graph. The graph can be deceiving as it is speed vs time. distance vs time is the bottom graph. That is the true "race" if you will.
The 300R and 300XS DBR 1.75 were very close. While the R got out a little slower it pulled through the mid range and hit the limiter at 95 24' behind the 300XS DBR 1.75.
You can see how much the DBR helped on the 30 when you look at the Red vs Blue. 9mph faster in 26 seconds and over 600' out in front.
Allison XB21 2+2
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06-08-2019, 06:47 PM #114Screaming And Flying!
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06-08-2019, 11:07 PM #115
Ain't nobody arguing about nuttin .. and you of anybody should take it the least personal.
I said before I'm just a stupid welder , and I build what I can afford. Or should I say, what I'm willing to spend.
I don't feel bad about it though , I'm in good company. Lots of guys are even bringing back the early model twin computer three litre's. I have friends in the UK an Oz that actually prefer them.
Please tell us, do you have anything to offer this thread of basically the pro's and cons of two strokes and four strokes in various forms and how they become useful in an outboard application. Or is your education and degree only good for derogatory statements?
How bout something personal and exciting like ... How many more payments vs month's of wty you have left .. Ppffftttt
Now I'm pizzed and gonna start writtin in all caps ...
ON SALE ALL NEXT WEEK BILLET 300X REED ADAPTER PLATES
Go from this ...
To this ..
Put the injectors outside where they belong ...
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06-09-2019, 05:38 AM #116Screaming And Flying!
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does a 300x have sequential injection or batch fire?
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06-09-2019, 09:59 AM #117
The early model .. had three injector drivers ( 1+2 ) ( 3+4 ) ( 5+6 ) are tied together.
Late models ... like the 300x with a starboard side mounted Motorola box, are sequential. 1 thru 6 .
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06-09-2019, 02:11 PM #1186000 RPM
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JrCRXHF liked this post
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06-10-2019, 08:14 AM #119
Robert , It's all good brother. Ifin I run out of local sources for cranks and "5 good rods" at a time, I know you'll sift thru your cores for me ..
Chaz = thinkin, all ya need is an opti-pop breadbox (plenum) air valve, and some linkage and you'd be good to go on the adapter plate ...
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06-10-2019, 10:01 AM #1206000 RPM
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