A few questions about some engines...

[Morpheus]

Ok, is there any remarkable difference between the 2.5 and 2.5R?? From what I can tell, the R model has a bigger head, to run cooler, other than that, is this it? I can see why you would want your engine running cooler if you were racing. Also, this 3.3 motor.....when you tack one on the T-Maxx body, anyone run into any problems with breaking axles or drive shafts??? I understand the Revo model is built to handle the 3.3 engine, but how about the T-Maxx? Just curious, thanks.

T.

 

[Metalhead Matt]

The 2.5 and 2.5r are too small for any T Maxx. You would be alright with a 3.3 on a stock 2.5 for a while, but drive shafts will break. Unless you ran the slipper way loose. Which would just ruin spur gears. Upgrading to 4908 T Maxx carriers, driveshafts and turnbuckles would solve these problems. Also, the center shafts need to be upgraded. 2 rear 4908 shafts, one for the front, one for the rear, fix this. A forward only conversion for the tranny is needed also. All these upgrades are cheap and simple. Forgot to answer your 2.5 question. The only difference between the 2.5 and 2.5r is the r is ported. Not a big power difference at all. A .15 is just too small for a Maxx.

 

[boomDR.]

i kinda have some similar i have a rolling chaise for a 2.5 t maxx and was thinking about switching out some part and put in a 3.3 to make it faster now would doing that stuff be smart or would i be better off buying a hole new 3.3 t maxx and adding different parts to that

 

[olds97_lss]

i kinda have some similar i have a rolling chaise for a 2.5 t maxx and was thinking about switching out some part and put in a 3.3 to make it faster now would doing that stuff be smart or would i be better off buying a hole new 3.3 t maxx and adding different parts to that

That would be your call. It may be cheaper/better just to get a 3.3 maxx then use your 2.5 maxx as parts. With a 3.3 maxx, you get better trans, bulks, shocks (sort of), slipper setup and axles. Could still use your arms, bulks, towers, shocks, header and servos off your old one.

By the time you upgrade the diffs, axles, carriers, trans, your around $130. A 3.3 is around $150, so now your edging $300. A new 3.3 maxx runs you around $420 and you get all the above and also a decent pipe, longer chassis and any other misc bits I left out.