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TRX 2.5 is a piece of shit

Discussion in 'Engines and Motors' started by JATO, Sep 4, 2006.

  1. JATO

    JATO RCNT Racer

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    does anyone else agree with me it takes so long to tune then it will come untuned again so you spend your time tuning your truck and not playing around.
     
  2. jetmechG550

    jetmechG550 RCNT VIP

    I had the 2.5R in my Revo and while it was a little finicky it wasn't bad. It's just very sensitive and needs very small adjustments. What kind of problems are you having?
     
  3. olds97_lss

    olds97_lss RCNT VIP Supporter

    I've had issues with the 2 I've had the pleasure of owning... or displeasure... Some people have good luck with them. I'm not one of them.

    The last one I ran was in my revo. It would start and run ok, but it had a really weird idle problem. It would stay rev'd and not drop down to idle for about 10 seconds when I let off the gas. Basically, it was just annoying. Other than that, it was ok. Not a real powerhouse or anything. But it made a good wintertime engine because I don't care about it.
     
  4. JATO

    JATO RCNT Racer

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    the problem i have is it will idle then i give it some throttle then it stalls or sometimes it won't shift to 2 gear.
     
  5. supercharged

    supercharged RCNT Talkaholic

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    it not shifting probably has nothing to do with the engine its probably your geabox out of tune
     
  6. ZANDOR

    ZANDOR RCNT VIP


    WHAT! Tuneing has every thing too do with shifting..
    I was at my LHS yesterday..There were 3 revos there with the same problem.They would not hold a tune.And would not shift right.
     
  7. 4u2nv

    4u2nv Gone - bye bye.

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    From what I have heard, there either really good engines, and people live and die by them, or there shit.. Unlucky enough, I got a shitty one as well. Save yourself the headache and just upgrade.
     
  8. supercharged

    supercharged RCNT Talkaholic

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    revos don't seem to hold a gearbox tune very well
    was at megamaxx's one day everytime he did a run up the road the shift point was different

    also he said some times it wouldn't shift so i'm guessing he may have the problem i mentioned above which isn't always related to the engine
     
  9. jetmechG550

    jetmechG550 RCNT VIP

    If your engine is not tuned right, especially if it's running rich, it won't shift or take really long time to shift. How much fuel is through the mill? How much tuning have you done to both needles? Have you tried going to factory settings and working from there? If it's dying when you give it gas I'm almost betting you need to pull the carb off and seal the base.
     
  10. JATO

    JATO RCNT Racer

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    anyone of any good mills that will drop right in or any that are coming out in the near future
     
  11. olds97_lss

    olds97_lss RCNT VIP Supporter

    I've seen the 3.3 run and wasn't overly impressed. Even after tuning it for the guy, it just didn't have much gitty up. Granted, it was pretty new with only a few quarts through it, but it seemed really doggy.

    My 18TM in my revo has a ton of punch to it and it seems to rev forever. Although, I noticed a big jump in power when I switched out the stock pipe for a Fantom revo pipe. Also a huge jump in noise... It's louder than my mammoth with an OS 21 RG and the XTM tuned pipe.
     
  12. Monkey Wrench

    Monkey Wrench RCNT VIP

    I switched from a CVEC pipe to a Trinity on my OS .18TM and I swear it's a new engine! Thing runs like a raped ape and the temps stay right at 230-250 with minimal tuning required!
     
  13. olds97_lss

    olds97_lss RCNT VIP Supporter

    Mine was the same way MW. Makes me wonder what it would be like with the 2.5R and the new pipe... I'm way to lazy to find that out. I'll probably throw the 2.5 back in when it cools off outside as my winter engine. Then I'll find out. But the fantom pipe totally released the beast on the 18TM. It had a lot of power before, but now it's downright rediculous. I geared it up a little to make it more controllable, but it will still pull easy wheelies on concrete with 15/36 gearing.

    The cool part is that I won the fantom on eBay for $5. Cost me $9 total from Hawaii. The seller said the pressure nipple fell off. I jb-welded a new one on and all is well. It's a $60 pipe! I was bidding on the trinity when I ran accross this. I figured for $5, why not?
     
  14. rccars411

    rccars411 RCNT Talkaholic

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    The very last traxxas I have EVER owned, I learned from the first time. Pull anything electronic or that POWERS the vehicle, that says TRX on it.
     
  15. SMaxxin

    SMaxxin GAME TIME! Staff Member

    It will be a different engine. My first Revo with the 2.5r wasn't all that great, it ran fine but the power was far from impressive. I put a Trinity pipe on it and it liven things up. Personally I have had good luck with the 2.5, I have owned at least five of them without real problems. As for the 3.3 it really starts to perform after about a gallon through it.

    Jato it sounds like your running a little rich, thats the most common reason for not shifting. If you want a drop in engine that WILL IMPRESS try the Picco .26 Max, it's probably the best thing next to converting to a BB.
     
  16. MEGA MAXX

    MEGA MAXX RCNT Talkaholic

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    my 2.5 is great so far in my revo, has some amazing power for a .15! I'm having problems with wheelies on mine!(still running the stock pipe and gearing)

    it is pretty reliable too and can be a bit touchy when it comes to tuning but if you just take it slow and turn in very small increments its just like most other engines. (dunno if the tnt mod helps with the tuning at all?)

    and yes mine does have a habit of sometimes not shifting for a couple of laps round a track, then the shift will just come back, very strange, and can be annoying, but is fine for the rest of the day, just has an eppy for those 2 laps then is fine.

    i have also sealed up the backplate, carbneck, and did the exhuast port for good measure, now on the same tune i cant even get it to move its that rich! so i did have an airleak somwhere.

    but as most people have said, there are good and bad ones, and ive found, they can be a bit picky with what fuel you use through them.
     
  17. vbgagnon

    vbgagnon RCNT VIP

    The 2.5r I had in my revo ran great. I sold it to Mr. Will, I'm assuming that it still runs good. I bought the 3.3 and am very impressed. It doesn't have the instant snap like the OS does, but it is very very smooth. I'd buy another in a heartbeat.
     
  18. JATO

    JATO RCNT Racer

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    i just had a stupid idea but how big do they make the mr.nija series engines. and also would it be better to get a drop in big block or is getting a conversion a better way to get more power. also this is for bashing and racing at my local track. i just want something to make the guys at my hobby shop who think there trucks are amazingly fast to shit there pants. there isn't really a price limit
     
    Last edited: Sep 17, 2006
  19. rccars411

    rccars411 RCNT Talkaholic

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    Mario Rossi engines are made up to .21. There are 2, one for onroad, and one for off road.
     
  20. robmob

    robmob Enthusiastically Apathetic Staff Member

    There are 3 Ninja Mills.

    MR21 B01
    MR21 R01
    MR12 T01
     
    Last edited: Sep 17, 2006
  21. rccars411

    rccars411 RCNT Talkaholic

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    Sorry, i was referring to the .21s that there are only 2 of them.
     
  22. REVOTMAXX.18TM

    REVOTMAXX.18TM RCNT Rookie

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    Installed OS .18TM, in my Revo got very pissed off at the 2.5R, also have a 2.5 in my Maxx, its doing the same thing the 2.5R was doing, I believe we have the same problem----an air leak somewhere. As far as the motors go OS blows the 2.5R away on speed, running, all the above!! Trinity pipe also.
     
  23. rccars411

    rccars411 RCNT Talkaholic

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    OS is by far the best way you can go for sport and racing for small blocks. they are almost 100% noob proof. And as we all know, last a long long time!
     
  24. JATO

    JATO RCNT Racer

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    well can you guys give me so opinions on what to put in my truck that will just crush anything. i think the fastest guy at my track has a .21 wasp or bigger there is no price limit and for a big block what is a good chassis conversion for the t-maxx and another question do .21 racing mills put out more power than shitty .28 say mills
     
  25. rccars411

    rccars411 RCNT Talkaholic

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    that generation of engines (wasp) were made by toki. Toki had a generation of bad engines being sent out and sold. Some of those to look out for are Fantom, Peak, and Orion's older engines. Orion switched to Picco after time (according to RCCA) because of problems.

    .21s are perfect for buggies. But as far as .28's go, its all about power! You can gear them taller with a .28 because of the torque you are getting out of it. .21s however, get all the R&D because its the legal engine in racing for 1/8 buggy.

    Sorry for the rambling, but hopefully it was semi useful to you.

    What do you look forward to doing? If you do want to go BB, i am suggesting something bigger than a .21. You'll have the power to bash and race, not to mention, it'll be cheaper over a .21 But if you want to strictly race, throw a hot .21 in there.
     

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