1979 Viking build

[89LASER]

I'll trade you a 27SRX for the 29

[LakeFever]

I have a 27 srx lol. I have most pitches and styles now. Some in duplicates. The only reason I’m not trying any of the 27 and smaller pitches now is while I’m still on the stock 200 ecu I’m not turning enough rpm. Later when I will spin higher I will be trying out my 24-27 stuff again. Then later when I add more power and more rpm I might try 30-32’s again. Time will tell

[LakeFever]

I went out prop testing today and only tested one prop. I loved it so much I couldn’t stop driving it. Hoss Triton 1 28p and it is really great. My favorite prop so far. If I test a prop that works better than this one I’ll be surprised let’s put it that way. The acceleration was great, the holding power and lift was excellent. It held the hull really tight and strong just like a large ear chopper without the excessive bow lift. I was on some bigger water and was really moving through some huge rollers and it launched straight as an arrow no bow rise effect at all. It made the whole experience feel super fun and very safe. I did launch huge today though I think the bow eye must have been 20’ plus off the water it was a huge jump. I dialed it back, way back after that one. It got dark sky quickly and the sun was ahead of me so the water was flat and hard to read and I didn’t see this set of rollers ahead and man did I launch it. Although I don’t take video it made me want to get a gopro it would have been so cool to see. I felt a little bad beating the hull up like this but I was following friends in much bigger boats and I was trying to keep up. It wasn’t ideal conditions for any real speed runs today so my best was 77.7mph.




I read a thread years ago about favorite props and captain insaneo said hoss tritons were the best prop for streams and I’m thinking he’s right. Loving this prop.

[LakeFever]

Interesting prop testing. I ran the ET cut tempest again on it now that I have a coned lower and it's not half as exciting as the Hoss was, or the first time I ran the Tempest on the stock lower. With the stock no LWP lower unit this et cut tempest was the bees knees. The only knock against it was the hole shot it would blow off a lot and i had to feather the throttle until it hooked. I do have the large PVS holes and they are wide open so thats got a lot to do with this but Im not going to bother much more with it for now. The 28 Hoss turned 77.9mph on the limiter so I guess I was pretty well there with it last time round when it ran 77.7mph. The 27 Tempest et went 76.4 also on the limiter ( 6200RPM ) which really surprised me because the tempest ran 78 before and I know I wasn't flat out yet it was at 5800 or so, definitely not 6000 yet so really great slip numbers on the stock lower. The cone does scrub speed but it also changes the hull dynamics considerably too. It is a lot more stable with the coned lower which is nice. On the stock one it was twitchier up top. The Tempest does hold the hull well and it is a confident inspiring prop to run, just not as much as the Hoss on my combo is.

So, seeing as im banging the limiter pretty easy I decided to try my A17 ProMax 225 ecu which has a raised limiter to 7600 with the Hoss 28 again and see how it runs simply as is. If its doggy or wont push past low 6's then I think my next mod is going to be increased compression via a head swap and again try this with the A17 ecu. I'm probably going to try the 2.0L fatblock heads first and if I dont like those then I'll swap to stock 200 heads cut to 34cc. I'm not sure if I commented on this before but I have the stock 38CC heads on it now I put those one when I was trying to figure out what was going on with my over heat worries during shake down. I also have the timing set to 23 degrees so nothing crazy, just little mods one at a time until I get it where I want it. IMO the only way to mod a two stroke is one change at a time and test so thats my approach. So far I'm running pump 91 no ethanol mixed at 40:1. My water pressure runs steady at 15 psi when Im about 5000 RPM and climbs to 20psi at full jam

When I'm running solo i'm having some balance issues so I have to make a slow left turn to keep it on pad flat. I'm going to make some ballast bags out of lead shot and blue jeans with hot glue. I'm thinking 10lbs per bag and make 4 of them and see how that goes. With a passenger it runs flatter and thats how I got my best number so far which is 81.4 on the 30p SRX. I am probably going to try that prop again after some careful attention to the prop height I may not have been running it high enough. It was a very hard prop to feel, it just wasn't hooking up right somehow I dont know how else to explain it but I could feel it wasn't carrying the hull properly. Maybe some set up tweaks would improve that i was running in a pack so plenty of stimulus happening

[skialot2]

It makes sense that the stock lower was twitcher up top. At 78 MPH you are only a few MPH of the limit of the stock lower. It was probably about to blowout.

[LakeFever]

It makes sense that the stock lower was twitcher up top. At 78 MPH you are only a few MPH of the limit of the stock lower. It was probably about to blowout.

maybe but it didn’t feel like it was going to blow out. It felt loaded and strong. I have blown out before and once just a couple runs ago but I actually hooked it because I was flying with another stream having a total ball and didn’t trim down enough for a corner. It wasn’t really all that dramatic but I did break the steering wheel lol. Not enough that I couldn’t drive back to the launch but enough that I had to replace it. Anyways there’s always a feeling out process with new stuff and I’m working through it best I can. My first stream blew out all the time but I had zero clue what I was doing then. Now I have ten percent of a clue, ten years from now I’ll have the other 90 sorted.

I got the A17 ecu installed and the hoss is going back on. Trying to get out as much as I can

[LakeFever]

I went out for a little rip today with the family. Not the best area for fast boat’n but the promax ecu completely transforms the sound of the motor. It sounds ten x angrier, it really growls now. Aside from the noise change driving it felt exactly the same except for punching it off a cruise speed. Quite a bit snappier. I dropped everyone at the beach and managed to run it up twice for short blasts only I couldn’t find any calm water and the best I managed was 74.4 I couldn’t say the rpm it was too rough to look down at the gauges. My Speedo has a recall feature I use that to measure speed. The downside was fuel consumption was way up. It probably uses 1/3 more fuel than the A8 200 ecu. Also the prop is black with soot it was running too rich. Again though you wouldn’t know it to drive it.

[LakeFever]

Trying to get out as much as possible before the season wraps up. Went out yesterday with some other fun boats and decide to put the stock A8 ecu back on again running the Hoss 28. I finally discovered the chine walk place with this hull. It happens at 80mph. I can and have driven it one handed up to 75 no drama at all but at 80 it starts to get flighty. It’s hard to find a long enough calm enough stretch to really work through this because it seems to like more trim up to 80 then I have to trim down a little to lay it flat. If I don’t trim it up on the way up to 80 it settles in at 77 and stays there. So a bit of technique is required and more practice needed for sure. It gets to 6200 rpm at 77 so that’s the brick wall it’s full rich. It will turn past that I can’t say how much because I was working the balance but I did manage to equal my previous best of 81.4mph with this 28 vs the 30 I did that number with last time. I also had a passenger yesterday and I asked him to sit in the back for a couple runs and that really made a huge difference. The hull loved that shift and that’s when I managed by highest speeds. I’m pretty heavy so I am asking the motor to move a lot of weight. I have a whack of tools and cooler and so on all on board as well. Definitely not running light yesterday. I think with my lead shot bags set in place and lightening up the load I can work the hull up further with this 28. It would be nice to see 85 or so on this combo. I also have decided to leave the A8 computer and the engine as is for the rest of the season and work on another motor for more power. This one runs too good to mess with and it’s still a lot of fun as it is.

One more thing that was extremely nice. Some time ago there was a thread about eye protection on here and one member suggested sky diving goggles. I bought some Kroops boogie goggles and compared to my wrap around sun glasses these goggles are amazing. No wind gets in your eyes at all! Plus they are so light and very comfy. They look funny but the safety and performance is well worth it to me.

[tnelsmn]

Congrats on the completion, Lake! The boat looks incredible in the water, it sits just perfect! I really enjoyed following along with your thread here.

You're at the fun part of all the prop testing now. I was in the river 2-3 days a week when I first finished mine getting everything sorted. Sounds like it rides about like mine, anyone could drive it up to 80, then you start needing some talent.

My rig likes about 50-60lbs of lead in the far aft port "wing". Lead wake .com has bags you can buy ready to go, but sounds like you're able to make some just as easy, and probably much cheaper.

Sounds like you like the SRX my boat likes those as well, but it likes an ET cut chopper a lot more. If you can get your hands on one of those give it a run.

[LakeFever]

Thanks Tony, appreciate it. I still have quite a few props to work through, no et yet but its on the list. Might get one cut too. I have some lead shot from the old stock car days but only 25lbs prepped in jean sacks right now. I had dropped them in the front beside the front seat outside of the stringer during my one solo run but it was way too rough to see if it was doing anything. My hull didnt really like the SRX much it loves the Hoss though wow that prop rides the boat so much higher it feels like it has air ride. Just upon take off at 20mph it seems to ride at least 6" higher out of the water than the other props. So hooked up. Loving it cant really take it off Im enjoying it so much.

As for the 80mph deal this hull is a lot different than my other streams which says they were/are shot and flexing or whatevering because this is a whole different experience. A good one thankfully. More seat time, more props too but mostly more seat time before season wraps up im not too concerned with big speed numbers this year.

[LakeFever]

Alright we are getting there. I added fifty pounds of lead shot ballast in the rear wing like Tony suggested and that made a big improvement in handling. Today more impressive was the head swap I did. I put a pair of 2.0L fatblock heads on and let me tell ya these heads woke this sucker up big time. I gained an easy 7mph and I was still climbing I just ran out of room. With these heads I blow right past 80 effortlessly and with less trim so it’s a lot easier to control too. Then on top of that if this wasn’t reward enough it burns less gas too! I’ve made this same run many times now and I can compare it is using less than before. Today I ran 87.3 on the same 28 Hoss which is really working so dang good I don’t know if Captain Insaneo is still reading any of this but it was following his suggestion to source a Hoss and man was he right. I’ve linked the thread below about the 2.0L heads in case anyone is curious. Tony if you’re looking for more jam out of your motor I think you would love these heads. I’m still on the A8 ecu stock fuel pressure. Checked the plugs all good. Piston tops still black. I did run 94 octane fuel at 36:1 today just to be safe


https://www.screamandfly.com/showthr...ds-on-2-5L-200

[tnelsmn]

I keep thinking of buying a set of cut heads. Just to find a bit more power, I'll have to check these out.
I'm still testing and tuning on my new brucato box. Back to the fun of wanting to get to the ramp every few days!

[LakeFever]

Did you get any gains with the brucato? That’s on my list of mods. I want to try my chipped promax ecu again too but with an adjustable fuel pressure regulator and do the wot shut downs etc. I really just haven’t felt like working on this now that the boat is working so well I’m having too much fun ripping around. I was hoping for 90+ with this first motor and I’m just about there now. The 2.0L heads worked out to 133psi so I could shave them for even more umph which may happen as well. Little by little you know the drill.

I went out again yesterday with a passenger 160lbs and it ran 84 consistently but now that I’m getting familiar with it I don’t like running fast with a passenger it’s hard to get the prop to bite. I tried with and without the rear ballast and it’s better with the rear ballast but with a full 26 gallons, tools, oil and whatnot the boat doesn’t like that much weight. Without the ballast in the rear the passenger in the back ran the best but the balance still wasn’t great it is harder to balance on pad this way than it is running solo with ballast. I’m also still on the 28p and going to run my 30 again soon solo with ballast and see how it goes. I also really need to get a GoPro aimed at my lower so I can see what’s going on and make sure I have the engine height optimized im going by feel at the moment

[rjdubiel]

Take all that stuff out the boat. 10 gallons of fuel and go out and run. If you get 84 with all that crap and another person, you're at 90 running light and alone. Remember the setup is different when you have a passenger VS alone. alone you can run the motor higher than you can with the weight of another person unless you keep that person in the back seat.

Stock Brucato will not do anything really exciting for you. You need to tune the box yourself to get it to work well. They give you the base curve when they ship it to you and you get to be the one to blow the motor VS them sending you a box that is tuned. If you don't know anyone with the program and cable to adjust the curve you will not be very impressed with it. you can use EGT and adjust the main fuel trim on the box + or - but you cant take away fuel up top, or add fuel up top, it does the whole curve. There are guys that can fiddle with the stock merc box to remove rpm limiter and adjust the curve.

if you have an ET or Yamaha Drag 3 28p i would try those. I never liked the hoss on my Vking. I liked my small ear chopper 30p but that little guy has cracked a few times now.


@Tony, I got some heads for you to run, these would be close to race gas but we would have to bolt them up and see, but that shoudl do it.

Compression is the best bang for the buck you can do for performance.

[LakeFever]

RJ thanks for the info on the Brucato that is solid to know what to expect. I will be doing more controlled testing and tuning with less weight, less fuel, adjustable fuel pressure regulator, chipped ecu, box of new plugs to read, etc etc but probably next year I'm having too much fun ripping around as it is to and running out of season to start modding it more now. I'm going to try a couple more props this year but thats about it. Im pleased with the motors performance at the moment and am working on a clone of this 2.5 as well as a 260 for later so plenty of mods coming over time. Got the Vandal to restore too in the coming years and some 2.0L plans for that one. Lots of boat stuff ahead


Props are weird. If you ran this Hoss on my hull and said you didnt like it I would be shocked this thing hooks and books and carries the hull so flat. I'm very pleased with it. Its easy to control and flies very well without the freaky bow lift stuff. It is basically in 10/10 condition too which helps. I still have a good pile of props to test although no ET's yet those will come in time. I may shave these 2.0L heads a bit too because Im only at 133 psi now and can bring that up to 145 without much worry. The pistons tops are still black I have plenty of color on the plugs too I think the stock A8 ecu can handle more. I used up all the head gaskets I bought for now so again this will be a next year thing. I will be buying a bunch of sets so at some point I probably will stuff some really tight heads on it and run some race gas just to see how hard this fishin motor will chug. I think I have 7 or 8 pairs of heads now, two of these small chamber guys. The rest are 2.5 stockers. One set of those is 34cc already. The chipped ecu I have was done by CDI has the limiter raised to 7600 I am quite curious to run that again with the motor now that I have the small chamber heads on it as well as the adjustable fuel regulator and dial in the fuel. These are all things I have to do when I have a full day or two simply to focus on tuning. Looking forward to it