TG MPH difference Straight vs Step?
 

I did a search on this, I know it's in there somewhere.
Same everything say 525s, drives, props. How much faster is the stepped hull?

I have been told 6-8mph

650 hp in a straight bottom can't keep up with a 525hp stepped hull.

I think it is more than that Frank. I would bet 10-12.

I think a 525 Gun will run in the 80's consistently and I don't think a 525 Straight Bottom will see more than low 70's.

straight bottom with 750's will run 85 all day, newer stepped with 700's will run 105. Pretty crazy...

That's a good point too Tony - it isn't linear, certainly depends on power points....

It's not just the steps but the weight of the boat also. The lack of the cabin helps a lot.

My 97 boat with 740s would run 86 (kevlar) my 500efi TSTG ran 80 all the time and 83 when light on everything.

My '96 ran a best of 75, downhill with a tailwind.

That was with 675 Chiefs on 12" Stellings boxes.

Something doesnt sound right there. Should be faster....

I agree.. i have 600's and mines faster.

Half cabin kevlar. lipship

mine with 600's tested by powerboat.

Top Speed at RPM 83.3 MPH at 5300
Acceleration in 20 sec. 72.0 MPH
Mirrange Acceleration 40-70 MPH in 6.8 Sec
MPH vs. RPM 58 MPH 3500 RPM
MPH vs. RPM 72 MPH 4500 RPM
Fuel Economy 1.1MPG 55 MPH
Fuel Economy 0.6Mpg WOT
Sound Level 88 dBA open

This sounds right. A friend has a 94 TG full cabin with 600s and it runs just about 80 depending on load/conditions.

hmmm, i think im going to add steps to my cafe over the winter. three or four should get me in to the 90's. :party-smiley-004:

Don't forget that there are other variables at play in some of the examples here besides just the steps. The step boats handle higher x-dimensions, and also many of the newer boats are running NXT setups.

I'd think if you had two identical hulls, one with 700 SCI's/NXT and the other with old school SSMIII's and BW-72C's, the driveline losses coupled with the extra drive drag would be such that it would take 800 hp or better to keep up. Now put the NXT's in a step boat, and then you have a 100+ mph package, where the old straight bottom with old drives and 700's is low-mid 80 mph boat.

With that said, don't go trying to put NXT's on an old straight bottom. If you get the props down where they need to be the NXT gearcase turns into a speedbrake.

Perfectly normal

The boat less wonder was driving:party-smiley-004:


I know the retribution is gonna hurt but it will be worth it:evilb:

What was the first year for the step?

Pretty sure midway thru 2000 the TG was stepped.

What wheels are you running SP? Drives?

The weight distribution is also so critical on a straight bottom gun. When we picked ours up from Phil, he said "Don't add any weight anywhere in this thing. A lot of time was spent on the balance of this boat." He was right. When I tell other TG owners that I set the boat at 3500rpm, tabs up and drives on 3-4, they look at me like I'm crazy. But, carbon fiber (8500lbs), cover girl cabin (all done in PVC), a little higher X-dim and good weight distribution (there are several lead plates bolted in different areas of the boat) allow it to work without porpoising. Have seen 78.4 with stock carbed 500's.

That's good speed. I know in race trim it would just bump 80.:coolcowboy:

That's the absolute BEST I've ever seen. By myself, about half fuel load and very cool spring evening air. It's typically a 75mph boat.

xr drives. 1:36. 30 bravo.

phil set the boat up new.

Ding, ding!!! Winner!!

Mine has 1.50 XZs, 29 Bravos reworked by Mazco. These wheels are razor thin. Thank goodness I've never hit anything! Any of the straight bottom TGs turning props in instead of out? I picked up 2 or 3 mph on my Formula by changing rotation. I also still have a 1" spacer in my lowers that I could remove as well but I don't know what kind of effect it may have on day to day boating.