Other Prop/Pump tuning after swap to a lighter hull?

2lick

2lick

Brap!!!
Location
Limerick, PA
I'm looking for some input...

I was running an 828 in a heavy square nose hull. The setup was tuned great and ran strong where and when I wanted it to hit. I rode it for a few time this year and she ripped and ran perfect hitting hard. I did a direct swap of everything under the hood and in the pump into a ~50 lb lighter and shorter hull (Brawler).

I got about 20 minutes on it yesterday. Something defiantly needs adjusted. Its missing bottom end hit. If I idle at 1/4 throttle and then rip it, it spins up? Trying to just hop it around, it also seems to run out of water in the pump quick and I had to work hard to keep it "hooked up". I only did one full throttle run (cause I fell off did some kart wheels and rung my bell ha). Seemed a bit slower as well. All around this combo has less emmf in the lighter hull but I know its not running right.

My pump setup is a TBM stuffer with a short cone, 10/16 hooker, 85mm exit nozzle.

Any advise where to start playing?
 
2lick

2lick

Brap!!!
Location
Limerick, PA
OK, thanks for that recommendation. As I am trying to think about my my next steps, I guess what I am learning is I don't understand how prop pitching works. I always just threw on what was recommended and one up or down. Time to do some reading... I'll be in luck if GroupK has any articles on this. Any good threads to read?
 
Henry Stephen

Henry Stephen

seems the toughest part for us 'novice' tuners, is to know what to listen/feel for, and then figuring out what to do with that information. lol
 
MADMAT

MADMAT

Location
Ohio
I have always wondered this too. I was able to keep my -3mm 13/16 solas with stock cone and my nozzle bore.....no problem when I switched to a 30lb+ lighter hull.

It ripped the same AND the hull felt better. Both.

Same with Korn switching over to his trinity light SXR.....the same prop still ripped hard! (still does!)
 
XJCrawler

XJCrawler

Location
Edmonton, AB
Weight isn't the only factor, hull design comes into play. Lots of these lightweight freestyle hulls ride more on top of the water then your envy or lightweight sxr
 
NVJAY775

NVJAY775

My home away from home.
Location
Gardnerville, Nevada, United States
As time goes on, you'll be amazed at how much power can be added by tuning your pump. There's so much to it and it's all fun learning it. One step at a time though and keep notes. As stated above. Your pump seal has to be tight and free of leaks first. Then prop up a bit. Luckily for me a buddy very close by is a pump genius and helps me out with re pitching, cones, ex nozzle boring and steering nozzle boring. Keep us posted on progress, so we can keep helping. Be patient.
 
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