94 Javelin 389t w/Intruder 150

I ran my new 24 tempest plus yesterday it came with large plugs so I was blowing out right before breakover. I had to drop the jackplate to get it on pad even then I had to ease it up . Once on pad @ about 5 inches under pad and tournament load I was turning 6000 rpm @ 60mph gps. Although the boat handled and felt great there no steering torque at all and unbelievable lift, I am worried when I go up with the motor I am going to be turning to many rpms, I want to be at 5400 rpm's this time of year. How am I turning 6000 now? Is it possble the large plugs are letting enough exhaust escape at wot to cause some cavitation?

Something is wrong, a 24 Tempest @ 6000 rpms is more like 70mph on any bass boat. Your slipping way to much. Stock 150?

Sounds like u need a stiffer prop or your rpm gauge is off. My old merc 150 would turn a 24 tempest 6000 this time of year easy so maybe you need a 25.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StratosDadRI &raquo;</TD></TR><TR><TD CLASS="quote">Something is wrong, a 24 Tempest @ 6000 rpms is more like 70mph on any bass boat. Your slipping way to much. Stock 150? </TD></TR></TABLE> Maybe on a speedo. Im turning a worked cupped 25 tempest 6300 2/1 gears at 70gps with a 200. Most boats with 150s I see turning 24s are running low to mid 60s.

Yes it is a stock but very strong 150. The rpm gauge is right I had it checked in the spring.What is confusing me is I have always ran a worked 25 4 blade @5.5'' under pad and it turned 5400-5600 during the summer and 5600 - 5800 during the winter, 65 - 68 mph gps, hole shot has always been bad with full tourney load. I had a blade tearing or cracking, so instead of dumping money into it I decided I was going to add a plate and prop try to cut down my slippage. I've always been told to run a 3 blade run 1 pitch down from the 4 blade and rpm's would stay the same, it doesn't seem to be the case here! I'm hoping smaller PVS plugs will cure the problem, will see tommorrow.

I doubt the plugs are going to make much diffrence at wot. You may end up having it worked to get it to do what you want it may not actully be a 24 could be off from the factory. Ive got the 25 im running b&b with cup added at performance propeller that will bring those rpms down but its been on 2 150s 1 was a xr6 and the other a xr2 and was 2 much for either it ran good on the xr2 on top but was a dog out of the hole the xr6 was somebody elses and he just said it was too much. I wish I had a 26 or 27 too try I might sell it. Your slip is way up if ive got your gear ratio right why are you running it so low? How is your lift? I would raise it up too 3 below the pad and watch ur revs to see if that helps my tempest runs best at 2.5 or 2.25 below ive got it at 3 right now and the lift is too much I know it sounds bassakwards but you might ass well try it I think youll end up running best around that 3" range anyway that will atleast give you a better idea of what you need Why would you want to run a 24 5below when you could stiffen the prop and run higher it will also come out of the hole better raised up. It really souds like you had it pretty good with the 4blade that may be the way to go just raise the jackplate a bit too make it come out of the hole, but as far as the tempest goes it should hook really well aroud 3 to 3.5 below just make sure your not over trimming it making it slip.

Gears are 1.86. The only reason I dropped it that low was to try and get clean water with the large plugs. I picked up some medium and solid plugs yesterday. I am going now to raise it back up and head to the lake to run it.The lift on this tempest is unbelievable. And yes right now at this point I wish it was back the way it was.But like I said above I thought I could improve the hole shot with the plate and the 4 blade didn't like it at all.

I have a B&B 24p tempest on my boat. Runs 66 gps with me and all my junk in it, not to much slower with a passenger. I am turning it 5800 speedo reads about 67 or so. I would have to measure, but I should be somewhere between 3 and 3.5 below the pad.

Switch to a smaller vent plug, and it will come out of the hole like it should. You can feel my boat accelerate when it finally gets on the pad, even without giving it more gas.

Funny thing is I have a 25p TRO4 and I can only spin it 5200. But those are stiff I think.

Ok!
Put medium plugs in it holeshot is awesome!
25-30 gallons gas, tournament loaded , water well its Lanier on a sunday http://www.bassboatcentral.com/smileys/Laugh.gif
All speeds are GPS
Set plate at 3.5" 60.4 @ 6200 rpm
3.25" 60.7 @ 6200 rpm
3.0'' 60.2 @ 5900 rpm
2.75'' 61.2 @ 6000 rpm
2.5" 61.0 @ 6000 rpm
2.25'' 60.0 @ 6000 rpm
I actually was lifting the throttle on some of these runs with only about half trim and no tail spray at all I mean 0, zilch, notta you get the point
The only notable changes that occured was lift, handling and steering torque. I actually liked the way it lifted, handled and rode @ 3.5'' but there is a vibration in the prop until I get it surfacing which didn't happen until at 2.5'', and this is where my top run was as well. But it rode like crap there, heavy torque and could not get good bow lift.
I am confused with these runs I expected a wider range ! So any other Ideas or am I missing something here? I'm thinking I need to try a 25 tempest! Going to borrow one this time first though !

Your #s sound about right to me the slip is a bit high you should proably try a 25 its always a good idea to try one before u buy as that gets expensive quick. You can try mine if you want to drive 2 hours to try it. What kind of prop was the 4 blade that was running so fast? It really sound to me like u need some cup added to make it hook, but I would sill say that 8mph will be a strech with cup or a 25. By my calculations you would have had to been around 8% slip so it was hooking like a mofo I would think that that it would be slow coming out of the hole its a give take thing the only thing ive foud that gives more of both is hp.

I do not know what kind it is. It doesn't have a name or number the only way I know the pitch is prop guy that done the work on it. As far as coming outta the hole well it sucked in a big way. That’s why I'm making these changes. A friend of mine has a 25 he is going to loan me when I get back off vacation, Thanks for the offer! Moved pictures to prop forum





Modified by fishnfool38 at 6:17 PM 7/22/2008

I have been on 4 boats with 24 tempest, all that turned 5800 -6000 were all 68-73 mph gps. boats. I get those same speeds with a 23 Tempest at 5500. 18' with a 150 HP Intruder.
I'm not trying to be difficult or rude but something just doesnt sound right. Now if you find out your tach is reading 500-700 to much I would agree.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StratosDadRI &raquo;</TD></TR><TR><TD CLASS="quote">I have been on 4 boats with 24 tempest, all that turned 5800 -6000 were all 68-73 mph gps. boats. I get those same speeds with a 23 Tempest at 5500. 18' with a 150 HP Intruder.
I'm not trying to be difficult or rude but something just doesnt sound right. Now if you find out your tach is reading 500-700 to much I would agree. </TD></TR></TABLE> Did you just say u get 68-70 at 5500 with 23p? If these speeds are correct yall need too check them gears in them bullets and such cause the numbers you speak of are not possible with 1.86 gears and 23 or 24 pitch tuning 5800-6000 rpms. 68mph with a 24 on this maybe with in reach but not easy.


Modified by riley1131 at 4:18 PM 7/22/2008

I agree if I could get back to just 65gps @ 5800 with this 24 I would be happy!

"I get those same speeds with a 23 Tempest at 5500. 18' with a 150 HP Intruder"

Sorry I meant I get his speeds 60-62 gps with a 23@55-5600

I don't know about other engines, but the limiter on mine kicks in right over 6k on my tach. So either your tach is reading high, or mine is low.

I know my pitch is right, I get 66 gps at 5800 with just me, but not a light load. Mine runs low 60's with a 23p gade, and runs about 64 with a 25p TRO4.

I answered your question on the prop forum. If you have/had a shooter, it would suck. I have a 25p one, and it turns a lot of rpms, but doesn't go fast. Of course it could use a rebuild too.

I have to trim mine pretty much all the way up to get it to run right. Are you getting enough trim? That last little bit is what really gets the boat moving. I want to try a 25p tempest too.

I'll take it somewhere else and get the tach checked again. Even if you take that out of the equation, I know I am turning harder than I was before and at a lower speed unless my gps is off since I put this prop on. Also I can only run my trim at about 3/4 gauge. I may have to send it to mark for more cup! I'll let you know on the 25 tempest how it works out as well! Thank you guys for the opinions!

I would think a 25trophy might work good it should spin eaiser than the tempest. When i was running my 150 I was turning this 25tempest about 5800 at 62gps threw 2/1 gears but ended up putting a fin on it to get out of the hole decent you might stiffen it up a bit and try that if it will pull on top. Mine was a 2.0 merc pulled like hell on top but was a chump out of the hole. I swaped it with a 200 powerhead and it really moves now. But as far as the fin goes its ugly but it works i liked the way it made the boat handel at low speeds i left it on the 200. The fin might get you out of the hole but it wont do sht for u if your mota aint got the balls to pull it on the top. I also talked to a guy that was fighting the same problems and he said he switched to a 24fury and problem solved. He claimed it came out of the hole good and pulled 2-3 more on top so you might try that direction if ur funds are right.

I don't think a trophy will spin up like a tempest. Nothing I got turns the rpms my tempest does. I get close with a 24p turbo, but everything else turns 5600 or less.

I have a 25p TR04 which is basically a trophy, and it will get up and go, but it won't turn up like the tempest. I love the tempest, it rocks.

I have a 25p TR04 which is basically a trophy, and it will get up and go, but it won't turn up like the tempest. I love the tempest, it rocks.

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Try a Fury its like Van Halen /Aerosmith all in one http://www.bassboatcentral.com/smileys/bows.gif