LSJ Mean Mini Jetboat
03-02-2015, 10:16 AM
#27
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
I've been warned the "P12 relies on too many BCM functions such as VSS". How does the speed effect the pcm?
The only maps I have stumbled upon are the in the transmission dialogue and torque management. Is this the only connection between VSS and engine functions?
Does anyone know of any other dependency issues on the BCM inputs?
The only maps I have stumbled upon are the in the transmission dialogue and torque management. Is this the only connection between VSS and engine functions?
Does anyone know of any other dependency issues on the BCM inputs?
03-02-2015, 04:58 PM
#30
I've been warned the "P12 relies on too many BCM functions such as VSS". How does the speed effect the pcm?
The only maps I have stumbled upon are the in the transmission dialogue and torque management. Is this the only connection between VSS and engine functions?
Does anyone know of any other dependency issues on the BCM inputs?
The only maps I have stumbled upon are the in the transmission dialogue and torque management. Is this the only connection between VSS and engine functions?
Does anyone know of any other dependency issues on the BCM inputs?
Not sure anymore what a missing VSS signal does to the P12 performance (I think mostly gearbox and speed dependent traction protections, but most are switched off) , but I ran quite some time wihout. (if problematic, make a VSS sensorl on your propshaft.
)Other BCM signals can be simnply ignored/deleted.
Edit; checked some old postst and in my car I at least needed a working VSS signal for the fan settings (bit tricky those settings in a swapped engine, pm me for more details) Otherwise it keeps running once trigegred, as the ecu thinks you're still standing still in a traffic jam...
And I needed a good speed signal for my on-track logging.
Last edited by Speedytec; 03-02-2015 at 05:08 PM.
03-04-2015, 09:12 PM
#32
Edit: Reversion explained here but now imagine adding water. http://www.hotrod.com/how-to/engine/...ine-reversion/
More insite on what types of cams are best. Beyond my pay grade at this point but the cam numbers may help decifer what you have. http://www.cpperformance.com/c-1501-...sion-cams.aspx
Last edited by Stumpalump; 03-04-2015 at 09:35 PM.
03-05-2015, 07:20 PM
#33
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
...because it's weaker, heavier and more expensive.
Have a look at the boats intended purpose
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
Have a look at the boats intended purpose
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
03-05-2015, 07:23 PM
#34
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
03-05-2015, 07:34 PM
#35
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
That's what I run in a rail. Nice and simple and have never had a problem. I hope reversion is not a problem. I thought all newer engines had a lot of that and don't run long with a wet exhaust. I don't know much about it but the cam keeps the exhaust valve open long enough that water from the pipe gets sucked back in the cylinders. A change to a marine cam is needed on hot rod V8's but to be honest that's all I know about it from reading Hot Boat magazine for a few years. Good luck and hopefully sombody can clear up weather or not this engine has any exhaust reversion. I see you have a factory looking exhaust. Is it ecotec specific and have others run them with out problems?
Edit: Reversion explained here but now imagine adding water. Race Engine Reversion - Understanding Reversion And How It Affects Power - Circle Track Magazine
More insite on what types of cams are best. Beyond my pay grade at this point but the cam numbers may help decifer what you have. CP Performance - Lightning High Performance Anti-Reversion Cams
Edit: Reversion explained here but now imagine adding water. Race Engine Reversion - Understanding Reversion And How It Affects Power - Circle Track Magazine
More insite on what types of cams are best. Beyond my pay grade at this point but the cam numbers may help decifer what you have. CP Performance - Lightning High Performance Anti-Reversion Cams
03-06-2015, 08:58 AM
#37
Senior Member
...because it's weaker, heavier and more expensive.
Have a look at the boats intended purpose
GoPro Jetboat sinks again! - YouTube
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
Have a look at the boats intended purpose
GoPro Jetboat sinks again! - YouTube
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
03-06-2015, 10:31 AM
#38
The manifold has been run successfully on these motors for quite some time. I think you would need a very large pulse in the collector to suck the water back up the 3" ID of that bend. Probably in the order of 28in^3(~.45L) going back into the motor to suck water back up the manifold. Because it's in the collector and has such short runners, the manifold is not making use of a tuned length. Shouldn't be a problem but stranger things have happened I suppose.
I run a light weight 16' aluminum V hull. Valco Bayrunner. Not a jet but the mid eighties 60hp 2 cly two stroke Johnson uses the same powerhead as the SST class hydroplanes. I set it up like a rear center console so I can stand to absorb the hits. It's my tenth boat. I grew up on a river, worked for a marina and for two boat manufactures. Had all sorts and even a big block 21' Concord but small aluminum boats are the best to drive and beat. All jets use a ton of HP so to run the rocks the you have the ticket with the light LSJ. The snap, throttle control and torque coming in at 2100 will be perfect. When we run the LSJ sand rail the folks with the slow mushy and heavy LS powered rigs look at my wicket fast junk in bewilderment. That jet boat will be the same because of the weight and instant full torque at low RPM. The V8's throw sand and slog foward but the LSJ snaps to life and gets on top of the sand. In and out of turns is better because at the crest I can instantly spin it up to steer with the rear. By the exit it's flat out gone in comparison and I'm running with some bad ass cars at Glamis. My experiance would suggest impeller and or fast idle solinoid to keep that thing at 2000 rpm so it maintains the explosive snap. OMG are you going to have fun!
03-06-2015, 12:05 PM
#40
...because it's weaker, heavier and more expensive.
Have a look at the boats intended purpose
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
Have a look at the boats intended purpose
Taking hits like these playing in the river you'd end up with a fiberous mess of a boat, you really want to be able to pound the dents back out and keep on going. I would be very impressed if you could build a hull out of fiberglass, as tough as this, for the 432lbs it weighs(bare hull welded out)
That aluminum mini jet boat is badass tho . . . looks like a ton of fun.
03-06-2015, 01:54 PM
#41
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
03-06-2015, 04:04 PM
#43
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
03-06-2015, 06:24 PM
#45
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
Cool part available. CBM MOTORSPORTS 2.0L/2.2L/2.4L/L61/LE5/LSJ/LNF ECOTEC BILLET WATER NECK BLOCK
03-06-2015, 08:27 PM
#46
You would have to. Maybe on yout heat exchanger line. On high performance or race car apps you don't run a thermostat but instead use a signal from the cpu to control fan relays. quick search..
Edit: What ever you do stay out of the boost untill your engine is at operating temp. It may be tempting to get on it as soon as you launch it in a raging river but let it get fully up to temp before you beat it. I run 170-180 and may see 200 max. Your results may vary but mine runs cool so I spend a lot of time warming up.
Edit: What ever you do stay out of the boost untill your engine is at operating temp. It may be tempting to get on it as soon as you launch it in a raging river but let it get fully up to temp before you beat it. I run 170-180 and may see 200 max. Your results may vary but mine runs cool so I spend a lot of time warming up.
Last edited by Stumpalump; 03-06-2015 at 08:38 PM.
03-07-2015, 10:05 AM
#47
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
You would have to. Maybe on yout heat exchanger line. On high performance or race car apps you don't run a thermostat but instead use a signal from the cpu to control fan relays. quick search.. Amazon.com: Meziere WN0072 Inline Thermostat Housing: Automotive
Edit: What ever you do stay out of the boost untill your engine is at operating temp. It may be tempting to get on it as soon as you launch it in a raging river but let it get fully up to temp before you beat it. I run 170-180 and may see 200 max. Your results may vary but mine runs cool so I spend a lot of time warming up.
Edit: What ever you do stay out of the boost untill your engine is at operating temp. It may be tempting to get on it as soon as you launch it in a raging river but let it get fully up to temp before you beat it. I run 170-180 and may see 200 max. Your results may vary but mine runs cool so I spend a lot of time warming up.
03-07-2015, 05:14 PM
#48
A company called CNC makes all aluminum foot throttles for a cable. Pacific Customs may be the best bet for customer service. The grey cables made by Control Cables are the good ones FWIW but check this guys throttle out near the end of the vid. I guess you can get used to anything. The one I use and like: http://www.pacificcustoms.com/mm5/me...w=&range_high=
Last edited by Stumpalump; 03-07-2015 at 05:22 PM.
03-07-2015, 10:36 PM
#49
New Member
Thread Starter
Join Date: 02-25-15
Location: Smithers, BC
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
That's a pretty reasonably priced pedal. I've added it to my bookmarks if I ever have to leave the stock ECU. The motor is running with the stock pedal with minimal wiring ans should, fingers crossed, be good to go. Hopefully it doesn't do anything funny under load.
03-09-2015, 06:11 AM
#50
How are you going to plumb the inner cooler? It would love ice cold water. I guess if you are out of cold water ports you could do a simple secondary supply thue a sea strainer. Latham Marine
For reference the mefi stand alone computer is a Mercury/Mercruiser marine controller. It's so perfect. I know you will continue to dick with the stock stuff but if you eventually swap, my tunner had to swap knock sensors to one that the mefi can read.
For reference the mefi stand alone computer is a Mercury/Mercruiser marine controller. It's so perfect. I know you will continue to dick with the stock stuff but if you eventually swap, my tunner had to swap knock sensors to one that the mefi can read.