im gonna get to the bottom of this: anyone with trx 2.5(s) please REPLY!!!  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Monster Trucks >> Traxxas Monster Truck forum >> im gonna get to the bottom of this: anyone with trx 2.5(s) please REPLY!!!
Page: [1]

Login
Message << Older Topic   Newer Topic >>
im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 2:32:52 AM   
flatlander_14



Posts: 835
Joined: 5/14/2003
From: Virginia Beach, VA, USA
Status: offline 		ok, i started thinking about the 2.5 engine and how so many people have problems and yet so many people love it. i want you guys to reply to this with the following info:

1) what is your elevation?

2) about what was the temperature/humidity at the time you broke it in?

3) how has it performed? any problems with tuning or performance? think its perfect and wouldnt trade it for the world?



i suspect some of the engine problems have to do with the elevation at which people break in the engines. i remember reading somewhere(after i broke it in) that near sea level you need to richen the engine more than the factory recommends to comensate for the air density. here is what i did so far:


1) near sea level, like 20-30ft

2) i broke it in around 6, it was about 70-75degrees maybe and little humidity

3) it was great for the first gallon and a half, now i want to throw it out the window. it became VERY picky at tuning, CONSTANTLY overheated, and would love to go to traxxas corp, find whoever invented the 2.5 engine stuff, and SHOVE IT UP THEIR ARSE!!!

4) gallons of fuel through it at the time of writing this?

ok, now how about you?


_____________________________

"He who run in front of car get tired,
He who run behind car get exhausted,
       Post #: 1

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 2:39:59 AM   
Savage_Dias



Posts: 1196
Joined: 5/26/2003
From: Southern, WV, USA
Status: offline 		Good luck dude, you're on a massive undertaking to say the least!

_____________________________

Savage 21 OFNA MBX Revo

(in reply to flatlander_14)
       Post #: 2

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 3:28:28 AM   
bubbafien


 

Posts: 423
Joined: 5/28/2003
From: farmington nm, NM, USA
Status: offline 		i am @ like 5,500 elevation and i had about 2-3 gallons before i sold it and it ran awesome it was in december when i broke it in so pretty cold. performed awesome, tune was EASY!

bubbafien


_____________________________

mp 7.5
full hardcore kanai

(in reply to flatlander_14)
       Post #: 3

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 5:30:03 AM   
jrtoons



Posts: 60
Joined: 9/3/2003
From: Budd Lake, NJ, USA
Status: offline 		1) what is your elevation?

about 1500 feet

2) about what was the temperature/humidity at the time you broke it in?

90 degrees 80% humidity

3) how has it performed? any problems with tuning or performance? think its perfect and wouldnt trade it for the world?

I'm on my 15th tank and it was very temperamental for the first 10. The last 5 have been trouble free and it has gobs of power.

I broke it in over a 3 day period - temps and humidity were consistent.

(in reply to flatlander_14)
       Post #: 4

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 6:02:42 AM   
yrral



Posts: 145
Joined: 7/11/2003
From: Quakertown, PA, USA
Status: offline 		1. i think i'm at 520 something feet.

2. I'm not sure about humidity nor temp. but i think it was in the 80's ...humidity...not sure.

3. only like a quart so far...lol. but so far its running great. i had a little trouble with spur gear, but that's b/c its old.

(in reply to flatlander_14)
       Post #: 5

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 6:21:19 AM   
Wookie



Posts: 887
Joined: 2/1/2003
From: Hillsboro, OR, USA
Status: offline 		I sold my T-Maxx, partially due to the engine being such a pain. But here were my statistics.

Elevation: around 80-100 feet.

Temperature/humidity: Upper 50's to low 60's and mid level humidity.

How did it run?: Well break in was a pain, tuning was a pain, keeping it running was a pain. I richened the mixture, leaned the mixture, made sacrifices to the RC Gods for the perfect mixture.

Nothing really worked. The sad part was that I had much better luck at keeping mine running through a complete tank of nitro than most of the guys I know. Part of it was that I figured out how to drive it. When ever the idle dropped quickly I would punch the throttle regardless of where I was. Kept it running most of the time, with out the throttle punch it would die 4, 5, 6 + times per tank full.

I probably had around 3/4 - 1 gallon through it, maybe before it became so frustrating that I just ran my RC10GT.

_____________________________

RC18B FT - Mamba 5400, Integy steering brace, CVD's front and rear, GP1100 batteries, RC18MT parts car...

(in reply to flatlander_14)
       Post #: 6

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 6:36:02 AM   
yrral



Posts: 145
Joined: 7/11/2003
From: Quakertown, PA, USA
Status: offline 		well i think break-in sucked but it was the same way when i had to break in the pro.15.

I think break-in at the end was great....mine ran great, didn't stall, no problems during break-in.

then i went to the "brickyards" and i went nuts jumping it and stuff. then the spur gear was bad...it was from the old tmaxx ( i did the 2.5 exchange. got another gear w/ 2 less teeth for better speed then that gear screwed up my truck....made it run weird. so i digged up the old gear and worked ok, but still striped.

gotta get a new stock gear...then it should run great.

if you guys are having trouble you might have to replace something inside.

Later,
Larry

(in reply to flatlander_14)
       Post #: 7

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 7:13:51 AM   
bigfin


 

Posts: 41
Joined: 7/28/2003
From: Goose Creek, SC,
Status: offline 		I got rid of the reverse stuff, used the fwd only gear. Truck is alot smoother, no lurch when idleing, better acceleration. I actually lowered the idle speed, whole thing seems better. Sorry don't remember any of the stuff from when I broke it in, but I definetly think the forward only is the way to go.


_____________________________

TC3
G-force

(in reply to flatlander_14)
       Post #: 8

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 10:16:14 AM   
*~RC~*


 

Posts: 27
Joined: 8/7/2003
From: United States
Status: offline 		i have never ever had a single problem with my 2.5 untill the day it died out and got replaced. it may have something to do with the fact that i live in hawaii, i heard hawaii is the ideal humidity eleveation and outside temperature to run cars. only problems ever where flooding of the engine after about 3 tanks, but that is eaisly fixed.

_____________________________

T-Maxx (Supermaxx conversion) with xtm 24.7 engine. IM NOT EVEN GETTING STARTED!

(in reply to flatlander_14)
       Post #: 9

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 11:28:57 AM   
bigjdubb


 

Posts: 508
Joined: 12/27/2002
From: Houston, TX,
Status: offline 		I am at about sea level maybe a bit above. It was low to mid 90's out and typical 90% + humidity. I didnt have any problem with the break in but ran into a few problems when I started trying to tune. Most of it was because I have never had a nitro engine before. Once I got it where I felt it ran well and didnt get to hot I havent had to change anything. The only problem I have is the idle isnt always right on. Like someone stated above, I have to keep my finger on the throtle sometimes to hold the idle. I am now on my third gallon and it still runs strong.

I think most of the problem lies with the fact that this is a mass produce high performance engine. When you compare the number of TRX 2.5 engines out there compared to other similar performing .15's. When you have to make that many the tolerances open up a bit and starts to cause problems. It works the same way with real cars. If Ferrari had to put out the numbers GM did, they would be in the shop even more than they are now.

Traxxas should have just taken the easy way and added more displacement to gain the power instead of trying to squeze it out of a .15.

(in reply to flatlander_14)
       Post #: 10

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 9:55:46 PM   
robin640



Posts: 66
Joined: 7/11/2003
From: Hudson, NH, USA
Status: offline 		1) what is your elevation?

Elevation was some where around 1500 ft above sea level

2) about what was the temperature/humidity at the time you broke it in?

80 to 90 degrees with low humidity

3) how has it performed? any problems with tuning or performance? think its perfect and wouldnt trade it for the world?

Break-in went very smooth ( only vapor locked it twice, no stalling reported ). As far as tuning goes, I have not really had to touch any of the carb. setting since getting it broken in. It has stalled a couple of times and I upped the idle a bit. Only ran 1/2 gallon through it so far and I am not running it really hard.

So far I am happy with the truck.

_____________________________

T-Maxx 2.5,Big Bore Shocks, THS Exhaust, FOC,Pull Start,RX Pack,HI-TEC 645,Sport Traxx Tires,Titanium Hinge Pins,Motor Saver

(in reply to flatlander_14)
       Post #: 11

im gonna get to the bottom of this: anyone with trx 2.5... - 9/3/2003 10:52:38 PM   
Razoo


 

Posts: 575
Joined: 5/19/2003
From: Ballston Spa, NY, USA
Status: offline 		I'm about 1500' above sea level. It was around 85 degrees and very humid when I broke it in. The 2nd week I had it, I put on a Crazynut head and its never been above 230 degrees. So far I have over 2 gallons thru it and hardly ever touch the needles and it never stalls. As far as I'm concerned Traxxas has produced a great engine.

(in reply to flatlander_14)
       Post #: 12

im gonna get to the bottom of this: anyone with trx 2.5... - 9/4/2003 12:13:36 AM   
bigjdubb


 

Posts: 508
Joined: 12/27/2002
From: Houston, TX,
Status: offline 		IU also have the crazy nut head on mine. Maybe the fact that the factory head is tiny is why so many people have overheating problems. The Traxxas head compared to the crazy nut head is silly, it's like half the size.

(in reply to flatlander_14)
       Post #: 13

2.5 - 9/4/2003 3:07:29 AM   
hose man



Posts: 22
Joined: 5/6/2003
From: MELBOURNE, FL, USA
Status: offline 		Ironic how life is I stuck up for the 2.5 same reasoning as the 1st post and then the motor frooze up temp was 180-190 it was running great and never had one problem until now.
humidity 90% temp 85 degrees slow break in took my time and only 3/4 of a gallon thru it ,after run oil every time .I have many other nitro things this is the first time I had problems .Does the traxxas 2.5 have issues probly, are they going to do anything ,probly not .
Just curiuos how many people emailed traxxas about it ,I did


Hosed

(in reply to flatlander_14)
       Post #: 14

im gonna get to the bottom of this: anyone with trx 2.5... - 9/6/2003 12:38:38 AM