tmaxx questions

[jbrownlee]

i have the tmaxx 2.5r what is the difference with the 2.5r and the 2.5. also has traxxas discontinued the 2.5r? why does the 2.5 have a larger spur gear than the 2.5r? are the trannys different?

[pottsgroverc]

Not sure about this, just a guess. Cooling heads are different for the 2.5 and 2.5R engines. 2.5R appears just be an upgraded version. The 2.5R probably has a different spur gear to adjust for a different RPM rating.

[Taqrin]

Not sure about this, just a guess. Cooling heads are different for the 2.5 and 2.5R engines. 2.5R appears just be an upgraded version. The 2.5R probably has a different spur gear to adjust for a different RPM rating.

Pottsgroverc is probably right on this one. But for most trucks, you can change the spur and bells to make the truck react differently. eg: if you go to a smaller spur and a larger bell gear(usually you change both at the same time, go up by 2 teeth on spur, you go down by 2 on the bell) This will give you a higher top end, and if you go the other way, larger spur and smaller bell, you get better bottom end, faster take off....

So..being it has a smaller spur, is because the motor itself has a lower output, so they want the truck to go faster.

Does that make any sence?

[Ricky Torres]

The 2.5 and the 2.5r engines are the same except for the head, I've had both of these motors and the only diff. is that the 2.5r looks cooler.

I have no idea y the spers are diff.:confused:

But the trans on the trucks should be the same.

[jbrownlee]

The 2.5 and the 2.5r engines are the same except for the head, I've had both of these motors and the only diff. is that the 2.5r looks cooler.

I have no idea y the spers are diff.:confused:

But the trans on the trucks should be the same.

if you go to the traxxas web site (http://www.traxxas.com/products/nitro/maxx/tmaxx33/trx_tmaxx33_specs.htm) and it says that the 2.5 , 2.5r , 3.3 have different gear ratios is that because of the spur and the clutch or is it the tranny???

[Ricky Torres]

on traxxas website
1. go to products
2.click on the t-maxx
3. then go to the part to where it says specs
this should tell you the gear ratioes for all three trucks.

[pottsgroverc]

The trannys between the two 2.5's may have a different gear ratio. There are several paths to the same ratio. The 3.3 will be different, apples and oranges here. Faster motor, different gear ratio on a different platform.

[Benz]

the r in 2.5r stands for racing. I know this because I the guy that bought my t-maxx 2.5r.

[Philderbeast]

The 2.5 R. R does stand for racing. The head is larger on the R...Why? do you ask...It is because the R is a much hotter engine. It is more powerful and runs at its best at a slightly warmer engine temp. You can run it a little leaner because it is a better (performance driven) engine. Yes it does look cooler, but it is defanatly more fun to bash with than a regular 2.5. My 2.5 R makes all the racers mad at the track, they run picco and OS and I can beat them around all areas of the track. I love it. And one other thing, the 2.5r is not obsoleate. You can get it through traxxas or you lhs should have it also.