Pro4

[Brandon_Charley]

We were looking at the Pro 4 trucks(I'm pretty sure thats what they're called) today at dirt wars and noticed that they all seem to have non-factory rectangular tube frame rails. Is this mandated by the rules? I thought full tube was best. If their is some kind of advantage this could alter our truck plans greatly.

[WorkInProgress]

Pro 4's are full tube frames, if your chassis has rectangular tubes as the main rails it is still considered a tube chassis. Most people just refer to a tube chassis a one that is all round tube, because that is what is most popular for TTs and custom chassis. I am not sure about the rules for CORR saying wether or not you need to have boxed or round tube main rails but it is quicker and easier to build a chassis using rectangular tubing.

[mexracer10]

I am not too sure on this but i think that they have standerdized frames in corr to keep the cost down.

[Brandon_Charley]

That makes sense. I knew that if rectangular tubing held a candle to round in terms of performance then we'd see it more often on the high end trucks.

[hoeker]

corr pro-4 trucks do not have a standardized chassis like the pro-2's and pro-lites. the CORR standardized chassis are built on a rectangular tube frame. most builders don't like this rule , mostly because the spec'd size isn't available in moly, but it does make it much easier to build. some builders have complained of strength issues with the rectangular tube but personally i've never had an issue with mine.

i only know of one CORR pro-4 that is built on a rectangular tube frame, i believe it's on the west coast now but i didn't think it was assembled. who's trucks were there? leduc and huseman are regulars at the ROR?

[Brandon_Charley]

I haven't learned all the names yet, but their were two. One had TTB in the front and I think it was black and green(I think it had this type of frame), and the other had a solid front axle and was black and purple(I know it had this frame). We wanted to see how the solid front axle truck performed because the front suspension seemed like it would put him at a disadvantage, we were right.

[jeff]

You should not assume that because the black and purple solid axle truck that did poorly yesterday is representative of ALL solid axle off-road vehicles. That truck has issues far worse than simply having a solid front axle. Would a solid front axle Pro-4 be competitive in todays races? Probably not. The vehicle you were looking at yesterday is so far from being a real Pro-4 that it's not fair to use it as an example.

Aloha

[grantdcol]

That makes sense. I knew that if rectangular tubing held a candle to round in terms of performance then we'd see it more often on the high end trucks.
It should be noted that square tubing is a good choice in some areas of a chassis where forces are predictable and consistent, so that the tube can be oriented correctly. This was discussed futher here:
http://www.race-dezert.com/forum/showthread.php?t=14075

-Colin

[hoeker]

One had TTB in the front and I think it was black and green(I think it had this type of frame), and the other had a solid front axle and was black and purple(I know it had this frame).

ALL current CORR pro-4's are A-arm front. the last TTB front Pro-4 was turned into a 2wd dune toy 2 years ago.

Personally i think the 2x3 Rectangular tube is a big part of the reason for the Success of the CORR Standardized chassis. 2" round molly may be a lighter but having a square foundation to build off has prooven great success on our tracks and saved thousands on the cost of new trucks.

The only "weak point" i've seen in the 2x3 tube is builders that don't plate the weld joints in the main frame and builders that try to attach 1 3/4 round tube to the center of the 3" wall of tubing. sometimes it's best to go through the 2x3 tube and weld to both outer walls, other times it can be sufficient to mount your tube at the edge of the square tube.

[Brandon_Charley]

You should not assume that because the black and purple solid axle truck that did poorly yesterday is representative of ALL solid axle off-road vehicles. That truck has issues far worse than simply having a solid front axle. Would a solid front axle Pro-4 be competitive in todays races? Probably not. The vehicle you were looking at yesterday is so far from being a real Pro-4 that it's not fair to use it as an example.

Aloha

I know that theirs someone out there that can make just about anything work, I just knew by looking at his truck that this probably wasn't the solid front axle guru. Are their any competitive solid front axle trucks in desert racing? The only ones I've seen at all are the 1450 Toyota's out their just to have fun which is why I phrased my statement the way I did, I didn't intend to dis everyone racing solid axles.

If these two trucks weren't Pro4s what were they? Seems like an awful lot of money for something you can only race sportsman or TT.

[.CAL.Photo.]

The #1 POS!!!

I know i know its not what you asked but that truck is super cool :cool: lol



CORRY