Mph?

[Danhercules]

Any guess's on how fast this boat is?
'74 Tahiti, Stock 455 olds, guessing about 250 HP, spinning a "A" at 4200 RPM

[dmontzsta]

60?
I would say more like 50.

[BUSBY]

60?

[DUECE'SDAD]

A buddy of mine had similar set up in a early sanger jet and thought it was about 67-70 and it gps at 53. He was sick after knowing it was only low 50's and put more compression pistons, tunnel ram and different cam, really made the motor thump and tuned off a wopping 57 mph. I would say mid 50's most

[BUSBY]

60?
I would say more like 50.
I was giving him the benefit of doubt :redface: (running down river with a 40 mph tail wind :D )

[cole13]

got a buddy with a 455 miller. Runs 63 I think. He has dual carbs though!!

[jackpunx]

A buddy of mine had similar set up in a early sanger jet and thought it was about 67-70 and it gps at 53. He was sick after knowing it was only low 50's and put more compression pistons, tunnel ram and different cam, really made the motor thump and tuned off a wopping 57 mph. I would say mid 50's most
LMAO.. GPS Sux

[dmontzsta]

I was giving him the benefit of doubt :redface: (running down river with a 40 mph tail wind :D )
:D its all good G.

[jpeaston]

I had a stock 455 with exception of performer intake under a Carter 600, with log exhaust gps'd 59 at 5100 rpms on a Wreidt Maverick. I rebuilt it 30 over with a tr and one 800dp and now I'm at 57.7 @ 4900. I still haven't figured out what size impeller I have. Talk about disappointment.

[Nucking futs]

45-50 at best................. :D

[XtrmWakeborder]

Hmm my mini daycruiser goes 53 mph "on gps" with 2 guys in it and it has a 20 year old pump and 20 year old stock 350 so id say 60.

[Squirtcha?]

Hmm my mini daycruiser goes 53 mph "on gps" with 2 guys in it and it has a 20 year old pump and 20 year old stock 350 so id say 60.
That's pretty friggin impressive. Really.

[BadBahner]

LMAO.. GPS Sux
Boats were so much faster before GPS's came out... :p

[steelcomp]

54.389 mph :cool:

[moneysucker]

My 73 tahiti with a stockish 455 olds and a berk with no diverter ran 70-75 I thought. Once I got a gps and a new boat, I know better now.

[SmokinLowriderSS]

Isn't there always a contraption to ruin your story about how fast your boat goes? :D These days it's GPS, before that it was a radar gun. Betch there's a few guys on here ruined a party with a radar gun in years past. :idea: ;)
If I was a betting man, 4200 on an A, I'd say 55. I been running an A at 4800 for decades and wish dad had had her radar'd OFF the nitrous for a baseline. He radar'd her at 72 running 5200RPM on the same A with N2O. :supp:
Wait a min,... JP Calc says 4200 eats up 234HP, sorry to throw this number in .... 50.8MPH. I forget I have that program. :redface:

[dmontzsta]

damn gps, ruins everything.

[Wicked Performance Boats]

Just don't carry the GPS. reset the max speed to zero. Drink beer and talk a fast boat. The more ya drink, the faster it goes!! :coffeycup

[BUSBY]

Just don't carry the GPS. reset the max speed to zero. Drink beer and talk a fast boat. The more ya drink, the faster it goes!! :coffeycup
That sound like something I would like to do ... I could hear me now (yelling at top speed) ... "see I told you it was a 100 mph boat" :idea:
Too, too funny Bud ...
Brian

[Wicked Performance Boats]

Brian, If your drinking a beer while driving 100mph, the only yelling you will do is " where did my beer go!" not that I would ever know how that could happen! :D Budlight

[SmokinLowriderSS]

Fortunately, with the higher sides and interior in my 100mph boat, my beer never goes far. It may be all over the floor from bouncing/rolling/spilling(!!!!!!) arround, but I know where it is, it's close by, and can find it soon as I get back under 70. :D :D

[XClutchboy725]

So Dan, How fast is it? Or did you just want all of us to tell you how fast it is? :hammerhea :wink:

[SmokinLowriderSS]

LOL :D :D :D

[BUSBY]

Your right BL, and I would have one great bench racing story telling everyone about how I lost my beer at "100" :D
LOL
Brian

[Raskal]

my old green boat had a stock olds and jucz pump and would 59 /60 on gps all the time .with just me in it

[Danhercules]

So Dan, How fast is it? Or did you just want all of us to tell you how fast it is? :hammerhea :wink:
LMFAO!! Its my brothers boat. He was askin me how fast I thought it was. I told him low 50's. I will let ya all know when he knows.

[CARLSON-JET]

If the pump is tired/loose and the olds is tired also, I'm gonna say 43 mph.

[dmontzsta]

LMFAO!! Its my brothers boat. He was askin me how fast I thought it was. I told him low 50's. I will let ya all know when he knows.
I thought you were just sizing up some more competition. :D

[kp216]

My "station wagon" 18' CobraJet has a 403 Olds in it. I turn my A impeller 4250 with the dog house on. Best GPS reading (with the dog house on) has been 55mph.
I'm gonna guess 55.

[XtrmWakeborder]

That's pretty friggin impressive. Really.
Really? Hmm seems slow to me. I should take some pics and have you guys tell me what ive got in it. I think the pump needs a rebuild, its starting to make a rattling noise. 20+ years, i think its due.

[Squirtcha?]

Really? Hmm seems slow to me. I should take some pics and have you guys tell me what ive got in it. I think the pump needs a rebuild, its starting to make a rattling noise. 20+ years, i think its due.
There are guys out there with bigblocks in boats like yours, running at the same speed.

[WUTWZAT]

Well if you want a boat that runs 50 check ebay the Rangers up for sale again, with a small block turning 4400-4600 I think with a B impellor in a Jacuzzi pump, Solid 50 all day and was easy on the gas too.
:p
J

[LVjetboy]

"Brian, If your drinking a beer while driving 100mph, the only yelling you will do is " where did my beer go!" not that I would ever know how that could happen! Budlight"
How about asking the wife to hold the GPS between her legs next thing you know...no more GPS?
:)
jer

[dmontzsta]

"Brian, If your drinking a beer while driving 100mph, the only yelling you will do is " where did my beer go!" not that I would ever know how that could happen! Budlight"
How about asking the wife to hold the GPS between her legs next thing you know...no more GPS?
:)
jer
ahhh man, that sucks.

[Danhercules]

no, THATS HOT!!

[XtrmWakeborder]

There are guys out there with bigblocks in boats like yours, running at the same speed.
Hmm i wonder whats so different about mine then. I know there arent to many of them out there. I've only seen 2 others, and one had an outboard.

[n8dawg]

similar set up here... umm. no better that 65mph on the gps!
Good luck.

[szokejohn2]

BBF with old engine,GPS at 68.engine has highrise intake,529 cam,OT headers,10 QT oil pan,runs 5200 RPM.With new motor,I havent GPSed it yet,but it sounds the same.

[XClutchboy725]

LMFAO!! Its my brothers boat. He was askin me how fast I thought it was. I told him low 50's. I will let ya all know when he knows.
Oh yeah! I just re-read the post. Now I see the Tahiti part. LOL :D
I was thinkin' like dmontzsta was. That you were diggin' up some competition.

[XClutchboy725]

"Brian, If your drinking a beer while driving 100mph, the only yelling you will do is " where did my beer go!" not that I would ever know how that could happen! Budlight"
How about asking the wife to hold the GPS between her legs next thing you know...no more GPS?
:)
jer
The question is.....Did you have any fun trying to find it? :D

[Squirtcha?]

Hmm i wonder whats so different about mine then. I know there arent to many of them out there. I've only seen 2 others, and one had an outboard.
I didn't necessarily mean exactly like your boat, but similar (larger miniday cruiser)

[LVjetboy]

"The question is.....Did you have any fun trying to find it?"
:D wasn't there trust me. Either in the bilge or overboard. And I checked the bilge too. The best part was after that she felt bad and bought me a new one with maps.
jer

[572Daytona]

I had a 75 Tahiti with the high compression (10.25:1) 455 Olds that was slightly modifed (alum intake, electronic ignition) and I saw a GPS speed of 64.5 at around 4700rpm if I remember correctly. I think the OLDS 455 was rated at 365hp stock from the factory.

[stillgoin]

just sold 72 18' southwind with 455. RV cam, torker intake, super coil, place div, 4 yrs on motor, ???? yrs on pump, GPS at 57mph at 43-4400. Would have done a bit more but was goin' up for sale...no need to push the Olds if ya know what I mean

[mexrunner]

have 72 tahiti based off the weimer mold with olds mild cam holley carb the rest stock ran 56 gps with worn out pump no diverter
Adam