Same here. New packaging looks good, but really want to get these stateside, so we can get things moving!

Guys,

I am new with Go GX engines (have a new 5R and 7R), just would like to know the differences between 5R and 7R?

Cheers

Adrian

5R has great bottom/good mid-top.&7R has good bottom/great mid-top. That's an easy way of looking at it. Then the 3R that nobody seems to like fantastic bottom falls off mid/top. Unless you send it to racer 22 [rex] then it has more bottom and the mid top of a stock 5R. Running mine geared up a tooth is easy the engine pulls like a tractor!

Appreciate that, thanks.

How about the fuel consumption on different types of venturis? and their pros and cons?

Cheers

Adrian

Generally the smaller the venturi the better the fuel economy, with a corresponding reduction in top end.
I think you find most guys run the 7mm venturi, which gives the best of both worlds.
Really slippery or dusty track, maybe go down to the 6.5 for a smoother application of power.

For run-in and tuning details, go to -

http://go-racing.vpweb.co.nz/Tech-Tips.html

How about the choice of pipes? I have the stock pipe that comes with the engines? Our track has a loose surface (sands), very bumpy, 70% technical (curves) and 30% straights.

The EFRA 2072 that comes with the GX motors is the best pipe for these motors as far as overall performance. IMO
Check out the GO USA thread. We were just discussing pipes on there over the last page or so.
The GX motors were designed to work with the 2072, so that is what I would use. As far as track conditions go, just change clutch and venturi, maybe clutch bell gearing as well to get the smoothness you want on the loose surface

What has more bottom end the GX-5R or the MG-66. I'm getting ready to break in a new MG-66 and was wondering so I have an idea on how to set the clutch.

low end is very close to the same, its the top end that the mg-66 has more of.

Ok thanks. So should I drop down a tooth on the clutch bell since it has more top end?

i run 13t in buggy and truggy, unless you have a very long straight at the track top end is not really needed, are straight is about 80 feet and with a
13t is still pulling when i have to hit the skids. just what works best for me.

They are tearing down the track for a new layout. So I'm not really sure what to expect. More than likely they will keep the front straight which 100' max. I was running a 15t. I'll put the 14t on and see what happens.

14 should be good for ya, give you alittle more rip out of the corners to clear those doubles/tripples

Okay thanks for the help.

What brand ? Buggy or Truggy ? What is stock gearing ?

For examlple: I run Mugen, buggy and truggy, stock is 13/46.

I run 1.0mm springs in buggy with stock gearing

I run 1.1mm springs in truggy with 13/48 gearing.