3 speed/sh 28/30%

[BlueRidge1]

I finally ran my 3 speed tonight. It is being ran on the following truck:

Fresh Savage RTR w/ cam SS
1 Gallon old SH 28 on 30% Nitro
New 4.6 diffs with 3000 weight in rear
4.6 Dual Disk Breaks
Cold Glow plug - HPI H5
Proline Mulchers
4.6 polished pipe
17/47 gearing

First impression.

1) Torque. Wow. Pulling front end up with slower pull of trigger vs fast blip. Engine wasn't warm and it was already flipping.
2) Top speed. Real nice. Noticable increase.
3) Engine temps - lower as HPI claimed. In fact, I tuned the engine richer to stop the wheelies - which caused it to become cooler yet.
4) Gear changing.. Well, very impressed. I had a feeling 3 gears would be too "busy" for racing. Well, it's all smooth and seamless.

Future. I may go up to a 18 tooth CB to stop the wheelies and transfer that power to the top end. I think this gearing may be the "sweet spot." I will report some more later. So far, there's nothing I don't like about this upgrade.

 

[jmarzilli]

I have to agree! The 3-speed is sick, I can't beleive how much more topend it has now.

 

[tannera]

i have only seen the top end on my truck yet because it wouldn't go into 1st gear so i am going to mess around with the shift point and i should be geting good pull aways now

 

[MAD-MAXX]

where did u get ur SH? I'm looking around for one. congrats on all the stuff u got on it. how much did all of that cost. where did u get that stuff.


thanks

 

[BlueRidge1]

I actually got the SH 28 directly from RCmart in Hong Kong. It was around 145 shipped. I think you can get even better deals now. Then for the icing on the cake you can sell your S25 (if it's brand new) for around 90, one way for around 10, and rotostart w/ backplate for around 30....

 

[MAD-MAXX]

yeah that is where I'm getting my SH .28..............is it pretty sweet???

mark

 

[BlueRidge1]

I have to say it is a nice engine. Holds a tune nice, too. I think the 3.5 HP may be a bit exagerated. For example, it's a good 20% or so stronger than a S25. This would put it right around 3 HP according to HPI's ratings (S25 being 2.5HP). The new K4.6 is rated at 2.9 HP. I would venture a guess that the K4.6 could hold its own against this engine.

The only thing I question so far is the quality. For example, the pullstart is mighty thin compared to a HPI pullstart. All the rubber parts seem thinner too (carb boot, etc). However, so far, so good.... No complaints here..