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Tr-15 maybe not so bad?

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flyp

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this is cross post that I replied in the nitro engine section.

Seeing as the tr-15 gets a bad rep. I thought I'd repost here.

new to nitro, but not rc, i bought the tr-15 suburu rally for my first nitro considering it was much cheaper than the landmax2 version. After having the same front suspension/bulkhead problems that masterbeav had, i made some minor modification and added some titanium rods, that seemed to have solved the problem so far. The a-arms still pop out of the ball joints after a big hit, but the rest doesn't bend or break anymore.

I also had/have problems with the gs-15 engine. After mucho stalling for no good reason, and horrible acceleration, and a 1/8 buggy still out of reach finacially. I decided to nickel & dime the thing into a worthy rally. I added a two needle carb., better air filter, thicker fuel tubing, tighter clutch springs, metal disk brake, bearings all around, stiffer servo saver spring and better wheels and tire combo.

so I thought she would run like a champ, and the chassis and suspension does really well when the gs-15 runs. But I am still plagued with stalling and tuning problems.

So at the moment, heres my consesus/problems to date:
with the upgrades, the chassis really performs like a rally car, full on throttle 4-wheel drifts, brake induced oversteer, and somewhat predictable handling over minor jumps and bumps. In the dirt, its a blast and maybe not 1/8 buggy performance, but its fun.

Problems: after adding bearings, the brake is too weak. one of the differentials has tight spot making it a little twitchy when off throttle, and unless drifting, it has a horrible turning radius.

But onto the real problems: the engine, i don't have much expieriance, but i would rate this engine as horrible. The car is difficult to tune, and is two entirely different beasts from a full tank of gas to a half tank. Since I love the way it drives, I plan on sticking with the chassis, but will be upgrading the motor, pipe and tank. I'd like to ditch the ball connectors for the front suspension and design/modify my own solution.

Overall, I'm still under budget for an inferno 7.5 w/o engine+ and have a very fast, fun rally car, but if I did it over I would just buy the landmax and upgrade from there.

I wonder if the gs-21 is plagued with the same problems as the gs-21?

Kyosho inferno TR-15
 
i bet after you did all the repairs and up grades you could of bought a good used mbx or a good 1/8 buggy?
 
yeah its a dilemma now. I put some effort into this car. and starting over with 1/8 would break the bank at the moment [buying an engagement ring too]. I'm not one to go cheap on most things, but this is my first nitro so I was maybe too prudent, didn't realize how much fun they can be. Maybe next year I'll have a worthy buggy to take to the track, and I'll know a little more of what I'm doing.
 
How's the compression on the engine? If you can turn the flywheel pretty easy, you might wanna take apart the engine and see the the sleeve is still tight or if you can push the piston through the sleeve....you may need a rebuild.

As for your diffs, what kind are they? Ball or gear?
 
the diffs are gear, i inspected them closely and one of the drive shaft gears has a very minor wobble, its gets worse the more the case is tightened around the bearings so i ordered a new one.

the compression could be better, after inspection the sleeve and piston are fine, but one the head screws won't tighten completely, maybe stripped out, which means a new crankcase maybe? which I'll just get a new engine?

which I have another question. Is it possible to shoe horn .21 rear exhuast in place of .15. so when I upgrade the chassis to an 1/8 buggy i can use the new engine, header & pipe?
 
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