21 spectra jet handeling problems

[NASTYTOYSRACING01]

first of ,im at 75-80 miles an hour and the boat doesnt handle nor at low speeds,its all over the place,no ruder on the pump,could that be it,ive heard of guys welding fins on each side of the ride plate for handling,does any body no any thing about that and if it works,and what should a blown 496 spin rpm wise.it hits 6000 no problem,i was thinking of turning the rev limiter up to 6300,any input would b great

[Riverbound]

What advise has Greg given you? I thought he was handling the build of this thing?

On my Spectra 18. I had a turn fin under neath the boat and a Large Rudder on the pump. When I got the boat back after selling it someone had removed the rudder on the pump and the boat was a handful to drive a rudder was put back on and the baot handles awesom once again.

as far as your RPM question...it depends on so many factors, you might want to consult who built the engine to get those answers.

[ultraDENNIS]

You gps'd it?

[NASTYTOYSRACING01]

yes we gps'd it ,it ran 73 with 100 gallons of fuel in it 6 and a half people and 4 ice chests and a fuel presure problem,so at a half of tank of fuel 2 people and a ice chest i should see high 70's if not 80'y

[ultraDENNIS]

yes we gps'd it ,it ran 73 with 100 gallons of fuel in it 6 and a half people and 4 ice chests and a fuel presure problem,so at a half of tank of fuel 2 people and a ice chest i should see high 70's if not 80'y

WOW. That boat looks and sounds bad ass.


Wanna know how fast my boat ran last weekend? :swear

[NASTYTOYSRACING01]

What advise has Greg given you? I thought he was handling the build of this thing?

On my Spectra 18. I had a turn fin under neath the boat and a Large Rudder on the pump. When I got the boat back after selling it someone had removed the rudder on the pump and the boat was a handful to drive a rudder was put back on and the baot handles awesom once again.

as far as your RPM question...it depends on so many factors, you might want to consult who built the engine to get those answers.

as far as greg building the boat he's not ,he set the pump in and the motor and thats it ,i can get better fed back on the internet as far as handleing,and poeple that own spectras,geg was talking about a keal fin maybe thats the rout

[RiverDave]

There's about a million Spectra Jetboats out there... Somebody has got to know the setup answer here?

RD

[NASTYTOYSRACING01]

hey denis if u have any way of geting a hold of don from the river he said he mite have a fuel pump,keith ekert pump and regulator for my boat,i spoke to greg he said it sounded like a tank venting issue,i talked to mat he said the pump is probally cafitating ,cant keep up with the blower

[75 Spectra V-Drive]

There's about a million Spectra Jetboats out there... Somebody has got to know the setup answer here?

RD

yes I know the answer:hmm:skull:hmm:skull V-DRIVE:fsakesJst kidding, my v-drive drives like shit as well:D

[NASTYTOYSRACING01]

yes I know the answer:hmm:skull:hmm:skull V-DRIVE:fsakesJst kidding, my v-drive drives like shit as well:D

mine just has some kinks to work out of it,not really a problem,just miner shit a boat owner has to go through,but i will say i pretty much stomped the v-drives this weekend,from 20 - 75-80 in about 2 seconds,v-drives dont do that

[78cole]

is it a tunnel or did just schiada do that

[NASTYTOYSRACING01]

is it a tunnel or did just schiada do that

its not a tunnel nor a schiada,semi v

[jetboatperformance]

Rhonda sent you some pieces to try today you should have them monday ,call me when you get set up ! Tom

[NASTYTOYSRACING01]

Rhonda sent you some pieces to try today you should have them monday ,call me when you get set up ! Tom

thanks tom ,u guys r a great bunch of people down there,and thanks 4 your time

[ultraDENNIS]

hey denis if u have any way of geting a hold of don from the river he said he mite have a fuel pump,keith ekert pump and regulator for my boat,i spoke to greg he said it sounded like a tank venting issue,i talked to mat he said the pump is probally cafitating ,cant keep up with the blower

What fuel pump is on there now? Where are you tanks venting? Beathers or through the filler caps? I really doubt thats going to effect the fuel pressure on your boat.

Don's cell is 714 269 8455

[NASTYTOYSRACING01]

What fuel pump is on there now? Where are you tanks venting? Beathers or through the filler caps? I really doubt thats going to effect the fuel pressure on your boat.

Don's cell is 714 269 8455

its just a craeger mechanical good up to 7 pounds,i dont c that keeping up with a blower motor,on top of that a 1471 that needs allot of fuel and air

[ultraDENNIS]

its just a craeger mechanical good up to 7 pounds,i dont c that keeping up with a blower motor,on top of that a 1471 that needs allot of fuel and air

Yes those carbs will create enough moisture for that blower. The problem is that pump. Throw that POS away and get aa Aeromotive or Edlebrock. You should also grab a Barry Grant Fuel pressure regulator too.

[NASTYTOYSRACING01]

have u seen thoughs piston pumps from race pumps,suposed to be bad ass,there rated at 204,gallons per hour and have one moving part

[NASTYTOYSRACING01]

have u seen thoughs piston pumps from race pumps,suposed to be bad ass,there rated at 204,gallons per hour and have one moving part

i dont think earo motive makes a mechanical pump do they

[75 Spectra V-Drive]

i dont think earo motive makes a mechanical pump do they

I put a Mallory on my blown 572 stays at 8lbs all day:beer

[ultraDENNIS]

i dont think earo motive makes a mechanical pump do they


no i thought you wanted to ditch that?

[NASTYTOYSRACING01]

no i thought you wanted to ditch that?

ditch what the mechanical pump not a chance way more reliable than a electric pump

[Flat Broke]

Call the folks over at Clay Smith for a stout mechanical BBC pump.

As for your handling problem, you might want to describe the "problem" a little better. Have you driven other jet cruisers to have an idea of what is normal? They don't turn like an 18' V bottom. I ran mine with rudder and without, and didn't notice a difference. Idling in no wakes isn't like an I/O or V'drive where you point the wheel where you want to go. There will be some jockeying of the wheel to keep things on the straight and narrow. Just use the force and don't wait to get out of line before you correct.

As for handling at speed, what kind of turning are you doing at 75-80mph? The boat should be able to carve decent turns in the 35-45mph range. To tell you the truth, I've never leaned into the wheel hard on mine at much faster than 50-55. But that boat had a turn fin and held a line pretty well.

Hope that helps,
Chris

[NASTYTOYSRACING01]

ive had plenty of jets to no this thing does not handle,when your cruising at 35 for a day of fun and hite rollers of all sizes doesnt mater at what angle it wants to spin out the boat is all over the place,at 75-80 the thing is floating around,where it should be riding on the pump,talked to tom at jet boat performance thinks that it is bow stering,the wedge was up side down 4 degrees so i turned it the rite side up to push more thrust down on the back of the boat to get the front up out of the water ,got to start somewhere

[Flat Broke]

I don't check 'round here as much as I used to, so sorry if this is late or redundant. What kind of shoe/rideplate setup is on the boat? Different shoe profiles can affect transom lift. Try running the plate around 2.5* up to start. If it has a plate, lose the wedge all together for now to focus on lift available from the shoe/rideplate setup.

From my experience driving 20-21' jet cruisers, bow steering, and being loose have a different feeling. Bow steering feels like grabbing too much wheel in a shifter cart and railing hard. Being loose has more of vauge feeling like driving on gravel with bald tires. They can both end in a spin, but it's a totally different feeling.

I've driven bowsteering cruisers and it's scary. The nose will hunt all over the place and you can feel the boat pulling you where it wants to go. This usually gets worse as speed increases. Because it doesn't sound like the nose is hunting at speed, I don't think you're fighting a bow steering issue.

I hate to tell you, but while Spectra's do okay in rough water, the jet versions of the 20 aren't F1 cars when it comes to holding a line in the soup. To give you an idea, cruising at 35-45 through the park Moabi area when there is a lot of chop from wakeboard boats, I'd be working the wheel a decent amount to keep things moving straight ahead. It never felt like I'd spin out, but the boat I'm talking about also had a turning fin. Even still, it didn't respond to input like an I/O.

The floating around at speed in chop is normal. Again, because it feels like it's floating around, I'd lean away from bow steer as the issue. A Spectra 20 is a heavy boat. If you're getting decent lift and unwetting a large portion of the hull, odds are you're left riding on the rear of the hull where there are no strakes and the only real leverage you would have are the small fins on the intake. Think about all of the weight in front of your fulcrum and how little force the intake skegs can furnish to resist the forces applied by the length of the boat ahead of that point. If your riding on the back portion of the hull, it's only a 12* V and doesn't "cut" too well. It tends to roll with the contour of the water more than a steeper deadrise hull. So the hull shifts with the water and there isn't enough bite out back to resist that motion. Sure a thrust vector that is lifting the tail won't help that scenario, but you'd feel bow steer that should scare you enough not to be able to run the boat in the 80s if that was the case.

For what it's worth, I'd only run my 20 WOT in small and consistent windchop, either running into the wind, or with it; never in a crosswind because things got a lot harder to control. Side rollers and stuff comming at a 45* angle or so kept me on my toes.

Hopefully flipping the wedge brings you some relief, but honestly, I'd go without it to start. Flipping it to 4* up may induce some porpoise, and if the problem your having at speed is truly due to unwetting too much of the hull, the wedge will likely exacerbate the issue.

Good luck with it, and post up your results. You can also email me if I don't respond to a thread, as I just don't have the time to get on here and shoot the shyt about boat stuff like I used to on HB

Chris

[NASTYTOYSRACING01]

i turned the wedge the rite way 4% up and it handled 80% better with the wedge turned up,felt like i lost some mile per hour though didnt gps it but felt slower,did nail the needles bridge with the roost though ,the roost went clear up over the bridge and let me tell you that bridge is high,any how i took the wedge completly out and need to get out and try it with out the wedge,first off i have to fix a oil leak that a local shop created,u want somthing done rite u just have to do it your self i gues

[Flat Broke]

There is a good chance your "seat of the pants" gps was right about the boat slowing dow. Before you go out again, buy a 1* and a 2* wedge from Jack at MPD in Costa Mesa. Between those wedges, you can run anything from-3* to +3*. We already know that -4 sucks, and +4 could be faster so hopefully the sweet spot is somewhere in between.

BTW, what do you have for a shoe and rideplate on this setup? Thrustline, rideplate angle and shoe depth/type all work together. Ideally you want to make your changes on the same day so that water conditions, air temps, etc. are consistent.

Sorry to hear about the engine problems. Hopefully you get that all squared away so you can dial in your pump setup and enjoy the boat.

Chris

[NASTYTOYSRACING01]

shoe is about 1/6- 1/8 below kill,ride plate is at 4%,i pulled the wedge out and am going to try it to c what that does,if nothing then ill talk to jack,maybe a wedge r 2

[jetboatperformance]

Nasty congrats sounds like your making some significant progress ! Glad the "adjustments" helped ! Small degree wedges are in stock from 1 to 5 if you need to go back with them ..Tom

[NASTYTOYSRACING01]

thanks tom ill let u no