Daytona 21 question

[Phat_Kat]

What kind of speeds can be reached with a 1000HP motor in this boat with a jet?
[ September 13, 2003, 08:40 AM: Message edited by: Phat_Kat ]

[Liberator TJ1984]

I would say at least 100+ ???
my 19' Liberator is close to that mph with approx. 750+ HP
Gopherrr

[Cs19]

There is a 21 who runs 110-115 with over 1000 hp(no nos) at the drags.Now this boat is very trick and has lots of custom hardware, a modified bottom and no interior,so its hardly comparable but I would think you could break that 100mph mark very easily. Have fun with that 1000 hp. :D

[Johnwithjm]

So are you buying a 21 Daytona this week?

[Dog]

Been setting up a 21' JBX (eiminator splash) with blown 496 we were turning around 6400 RMP with a magbronze A, we were running around 95. Takes a lot of set up work to get them to the higher speeds.
http://www.***boat.com/image_center/data/520/292Dscf0040-med.jpg
http://www.***boat.com/image_center/data/500/292DSCF1107_copyA_copy.jpg

[Phat_Kat]

Johnwithjm:
So are you buying a 21 Daytona this week? nope just curious. Maybe next week :D Thanks for the info guys.
[ September 13, 2003, 02:08 PM: Message edited by: Phat_Kat ]

[eliminatya]

i have a 21' with a blown 581" not sure of the power, but i hit 102mph with 350lb passenger @6200 rpm with a magbronze aggressor ab. hopefully the intercooler addition will help me pick up a few mph. Dog what kind of impeller are you running sounds like that 496" is making some power.

[Dog]

Its a magbronze A. The motor is a 496 with a 10:71 running about 13 pounds of boost with a chiller.

[TIMINATOR]

Why are you guys running A and AB impellers if you have so much power? Am I missing the point? I run a 21 Daytona with stock pump location,stock, untouched hull,full interior,Lightning headers,ALUMINUM AA AT impeller with a Don's inducer,572 BBC on 87 octane pump gas here in Phoenix(105 +deg outside!),and 2200 ft.altitude. My combination turns 5800RPM at 93-95MPH with one passenger,I'm looking for 100MPH! I like my low cruise rpm (3300at 42mph)so I would rather not cut the impeller,but I need to run triple digits! Oh yeah,I'm doing this to prove a point,so I run a single 1050 too! Anybody got any ideas? The Cheater kit and 8-71 are under the bench, but I want it with no power adders,I'll add them later. Has anyone any experience with setting back the pump?How many mph gain? TIMMINATOR

[HammerDown]

Terminator, I did a setback on my 21 Daytona...no really I did it myself. A noticeable difference for sure.
Waters breaking way behind where it was before the set back, the boat really floating at WOT...less wetted hull ='s less drag, that ='s more MPH.
I would belive thats your next move. wink
PS. failed to mention...at the same time I did a shoe and ride plate...so all that really, really helped.
[ September 14, 2003, 07:21 PM: Message edited by: HammerDown ]

[TIMINATOR]

How fast is yer boat? Right now when the water is smooooth,mine is way up on the plate and it looks as if the whole boat is out of the water,the bow seems too high though but I havent seen pix of a properly set up boat at speed either.I have been told that the bow has to run high because the shoe is not deep enough(its about .080 up from the keel line)and the pump can't get enough load. Does that sound right? Mine also runs 3-5 MPH faster in a 12-18" chop. TIMMINATOR

[HBjet]

The 21' Daytona CS19 is talking about runs over 100mph with no nos, full interior, and 4 peeps in the boat. Like he said, it has some extensive bottom and pump work, and the motor is making a true 1000hp. I don't know what impeller or RPM's it is turning though.
HBjet

[HBjet]

TIMINATOR:
Why are you guys running A and AB impellers if you have so much power? Am I missing the point? I run a 21 Daytona with stock pump location,stock, untouched hull,full interior,Lightning headers,ALUMINUM AA AT impeller with a Don's inducer,572 BBC on 87 octane pump gas here in Phoenix(105 +deg outside!),and 2200 ft.altitude. My combination turns 5800RPM at 93-95MPH with one passenger,I'm looking for 100MPH! I like my low cruise rpm (3300at 42mph)so I would rather not cut the impeller,but I need to run triple digits! Oh yeah,I'm doing this to prove a point,so I run a single 1050 too! Anybody got any ideas? The Cheater kit and 8-71 are under the bench, but I want it with no power adders,I'll add them later. Has anyone any experience with setting back the pump?How many mph gain? TIMMINATOR I was just wondering here because my motor turns a Legend B impeller at 5800rpm and I run 94-95mph in my 19' v-bottom. What RPM does your 572ci make the most HP? Is it 5800rpm? How much HP does your 572 make? Is it single carbed, or a tunnel ram deal? I'm just wondering because I don't know if that's normal or not. Since we are both turning the same RPM, and running the same speeds, but our impeller size is way off, hull size, type, and weight are off, and our cubic inches are also off. Thanks
HBjet

[TIMINATOR]

Single 1050 carb and i'm sure my 21 Daytona weighs more than your 19'V. Motors never been near a dyno so have no clue about the other HP/RPM deal. Been thinking about going smaller on the cam duration or just tightening the lobe separation to lower its peak hp/rpm.Judging from my past experiences,I suspect that the peak HP RPM is about 6300. When I went from an A impeller at 6050-6100 rpm to the AA at 5800 rpm the speed only dropped off about 1-2 mph, but I got that back with setup changes. Also intake pressure is about 12-15 psi at 95 mph, is that bad? TIMMINATOR

[PC Rat]

12-15psi sounds low. For comparison, I get about 42psi at about the same speed, I may be closer to the high side though.
Brian

[Dog]

The reason we run a smaller impeller is because that is where the motor is cammed at. we can lower the boost and run 6 or 7 pounds on pump gas and turn the same impeller 5800 to 5900.
We were running an aggressor alm. AA running it 5800 with 9 to 10 lbs. of boost but it blew up. lol
[ September 14, 2003, 10:14 PM: Message edited by: Dog ]

[565edge]

Dog:
The reason we run a smaller impeller is because that is where the motor is cammed at. we can lower the boost and run 6 or 7 pounds on pump gas and turn the same impeller 5800 to 5900.
We were running an aggressor alm. AA running it 5800 with 9 to 10 lbs. of boost but it blew up. lol Do you have any more pics of that 21' splash daytona,is it gonna be for sale?Do you know what they sell a bare hull for?The reason eliminatya runs a a/b is because thats where the motor is making power at,hopefully with his intercooler and 10-12 pounds of boost he will turning it near 7,000 rpm and hopefully get up past 110mph or so,those 21' feel so good at high speeds.
[ September 14, 2003, 10:19 PM: Message edited by: 565edge ]

[Dog]

Thats all the pics i have here. This one is already sold. There is one on ebay i believe is where i saw it at. These JBX hulls were done by jimmy johnson this one is a 1995 in 96 or 97 he used the same molds and called them firehawks, he still has the 21' molds but won't build anymore he will only build the 26' cats. That is what i have heard anyway havn't talked to him personally.

[MAXIMUS]

TIMINATOR:
Single 1050 carb and i'm sure my 21 Daytona weighs more than your 19'V. Motors never been near a dyno so have no clue about the other HP/RPM deal. Been thinking about going smaller on the cam duration or just tightening the lobe separation to lower its peak hp/rpm.Judging from my past experiences,I suspect that the peak HP RPM is about 6300. When I went from an A impeller at 6050-6100 rpm to the AA at 5800 rpm the speed only dropped off about 1-2 mph, but I got that back with setup changes. Also intake pressure is about 12-15 psi at 95 mph, is that bad? TIMMINATOR Where is your hand hole located in relation to the transom?

[MAXIMUS]

I would contact Jack at MPD & let him see the boat. He is very good at making them work! :)

[TIMINATOR]

MAXIMUS;the farthest rear point of the handhole cover is about 1 inch aft of the transom, but still inside of the bolt-on transom coverplate. I just bought a digital camcorder and hope to get some video so someone with more knowlege can advise me what to do next. Does anyone know about moving the tanks back to the transome? There is a reinforcement bulkhead about 18" foward of the transom and the tanks are just in front of it. Can they be moved foward of the tanks if I set the tanks back? As far as the pressure goes,do I shim the shoe or lengthen/lower the stingers on the grate.They are now up 1/2" from the keel line now. THANKS GUYS! TIMMINATOR

[Cs19]

those 21' feel so good at high speeds. Has anyone here seen the stretch limo shut down after a full pass at the races? That does not look like fun to me.I know this is his race set up and everything but it sure looks like a handful to shut that thing down.Does anyone have that problem with there 21ft. tunnels? They look great at speed but thats a big hull to shut down after a 110-115 mph run. Im very unfamiliar with these boats and just curious what they are safely capable of on the river.
http://home.pacbell.net/jmcclure/SLimo99.jpg
I have a sneaky suspicion that this is the fastest Jet driven 21 ft. tunnel out there with an 8.55 @ 126mph and change. :D

[jerry billet]

I marvel at Marty and his stretch Limo. I also run a 21'Eleiminator at the drags, as well at the local watering hole. the new rule with NJBA is any jet over 100 MPH must have a pop off or shaft ratchet. i've heard the ratchets are not that effective in a jet, unlike the V-drives. If you look at the fast jets, they open thier pop offs at the finish line, before backing off the throttle. This releives the inlet bowl pressure, then you don't get that high pressure bubble at the intake which tends to lift the back of the boat, thus causing bow steer. and yes, it can make it hairy at this point.
I adjust my shoe/ride plate as much as 3/4" below the line of the boat to get some bite. Feed the impeller at 40+ psi. Otherwise I run out of water and lose momentum, causing a porpose effect.
Lost a few races to this. If I have a slight breeze, I don't have the problem, but things change while on the rope.
Jerry

[565edge]

cs19:
those 21' feel so good at high speeds. Has anyone here seen the stretch limo shut down after a full pass at the races? That does not look like fun to me.I know this is his race set up and everything but it sure looks like a handful to shut that thing down.Does anyone have that problem with there 21ft. tunnels? They look great at speed but thats a big hull to shut down after a 110-115 mph run. Im very unfamiliar with these boats and just curious what they are safely capable of on the river.
http://home.pacbell.net/jmcclure/SLimo99.jpg
I have a sneaky suspicion that this is the fastest Jet driven 21 ft. tunnel out there with an 8.55 @ 126mph and change. :D Marty might have the quikest but im not sure about top speed for a 21',the guy i bought my 19' from had a 21' edge that ran around 126mph too?

[MAXIMUS]

I have killed my engine at 90+ & coasted to a stop with no ill handling side effects. The boat just settled back down & came to a straight stop. When comming down from 109 it is a no brainer! I have also made some 100+ passes across boat wakes & chop with out feeling like I was about to get tossed. I actually have more fun driving my brothers blown 210 hallet with the IO! That boat is a hand full! I think once you spend the money & time to make one fast, it is a hard boat to beat for speed & safety! :)