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Overheating........

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Deviant X

RC Newbie
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yeah this seems to be a typical issue amongst the t-maxx 2.5. i've done everthing from cleaning the engine, creating better airflow, richening the fuel mixture(made it too rich at one point). i've been using the trinity fuel for a while now and only this spring/summer it's been overheating. i used to overheat it but that was due to excessive abuse( doing donuts ). i'm just curious as to what my problem could be...its quite frustrating. :angry:
 
We need some more info about your rig. Does it run good? How hot it's getting. What size tires, clutch bell and spur gear, ect... My 2.5 has always been a bugger(bought used/half shot). Getting hot(320 or so), runnin' crappy, holding rpm's after letting off the throttle. All the signs of an air leak, basically. I sealed the engine and nothing changed. Finally, I thought again about the lack of compression, so I tried tightening the head bolts. With an allen wrench by itself, they wouldn't budge, but with a little torque persuasion(small breaker bar) I got them to move about a 1/4 turn each. I checked to see if I could move the piston past the pinch as easily as I could before and it was a lot tighter. Bingo! Factory settings, slowly leaned 'er out, and it runs great. Check your head bolts the way you see fit; I certainly don't recommend what I did. I was prepared to part ways with this engine if any of the bolts would have stripped/broke.
 
yeah it normally runs well. i've torqued my head bolts already. no signs of any leak. i purchased a new spur gear. its a steel aftermarket(forgot the brand name). i also purchased a new air intake from team associated. and upgraded my shocks a bit. other than that everything is basically stock.
 
It seems that most people with a 2.5 Maxx has had heat issues at one time or another. It's just that a .15 on a truck this size is too under powered. Mine runs great now, but climbs into the 290's. That's with the outside temp around 75. I just stopped worrying about it. If I stop and let it idle for 15-30 seconds, it jumps down to around 255. But if I go any richer on the hsn, it won't hit 2nd gear. I forgot to mention that those temps are without a body. As soon as I fixed it and got 'er half-assed tuned, I ran outta fuel. I'm thinking about stepping up to 30%. I'm running 18/72 gearing with new 3.3 stock tires. With the stock 2.5 tires, it has no top end with this gear combo. How hot does your mill get?
 

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