tuning the revo 2.5

[inpresser]

Whats goin on?
I need some help short and simple
my revo runs poorly = i cant tune it properly so here we go
true or false 2.5 is hard to tune ? I want to upgrade to big block anyways T or F they are easier to tune. I removed the ez start because it gave me a fault one day and my truck wouldnt start I didnt like that, too many variables. so I cannx it put on a ofna shaft start system now it doesnt like to start I havent had time to reset to factory setting yet due to the endless rain. So I ask my peers for help. just some info I been into R/C for many years but this is my first nitro. Im stationed in japan so I have no local shop to ask only you guys . so thanks ahead of time . Q

[TRXrevoRacerOS18]

the 2.5 is a very hard engine to tune, as it has a "mind" of its own i guess you could say. There are a lot easier engines to tune out tehre such as the os 18tm and the rb 323. Good Luck!

[rwarner]

if you want to stay with the original configuration then go with the OS .18 tm
the 2.5 is a bear to keep tuned and like was stated earlier they have a mind of there own ,
i got a larger cooling head for mine and it seemed to steady out the tuning somewhat .
but shortly after doing that i got pissed and swapped out the 2.5 for a OS small block the cvrx to be exact ,butthat was for my tmaxx thoe ,not sure if it will work on the revo ,
but try the head swap if you have the time and money might do a world of good ,

also i noticed your stationed in japan ,just wanted to say THANK YOU for defending us back here in the usa
you take care and god bless

[Duster_360]

2.5 has a bad reputation about tuning, whether its deserved or not is another issue. I've had 2, still got one, and I find things are a little better if you take your time with it. They are a really strong motor when you find that sweet spot but they need a little patience to get one tuned to its best.

The 2.5 has a relatively small sweet spot and if you're tweaking the needles 1/4t at a time, you may miss it altogether. I make not more than 2hr adjustment (think clockface) and always on a warmed up engine. Then I give it a few minutes run time to understand what that adjustment actually did. Then I go from there with further tuning. Running day to day usually won't need to fine tune, but when its sat for a week or more, mine usually needs fine tuning.

The LSN seems to be under appreciated, mis-understood, not sure which, but on the 2.5, but it has a big affect on take off and temps. Once you get HSN right, set the LSN so it will idle for a short while and still have good punch off the line. Seems there's more than a few that either load up (rich) or have little punch (lean).

[savagepicco26]

true or false 2.5 is hard to tune ? I want to upgrade to big block anyways T or F they are easier to tune.
true on both occasions. i have a revo, a savage, and used to race 8th scale buggies. i can tune big blocks in my sleep compared to this 2.5R in my revo. i've got it running decent, but i feel like the motor's got more to give. if i upgrade though, i'll be getting the OS .18CV-R. the TM and TZ are powerful motors, but i can't justify the $200+ pricetag on them with the CV-R has about 85% of their power. just got to finish my starter box conversion so i don't have to use the ez start or a pull start. $60 for a revo starter box.

[inpresser]

First off thanks for the info, second my appologies for not reading more and posting in the wrong section last time i was tooling on r/c's there were no forums. Im a jeep what can ya say!

rwarner thank its appreciated
heres a pic of what i wrench on day to day
btw probably gonna go with the o.s. 18tm ,

[zakerid]

if i were you, i would try to get the nack for tuning the 2.5. that way you could handle anything. with my 2.5 i found that the HSN needed to be further than 4 turns and that the LSN is the "touchiest" (is that a word?) part of the carb.

[savagepicco26]

rwarner thank its appreciated
heres a pic of what i wrench on day to day
btw probably gonna go with the o.s. 18tm ,
what do you do on them? i'm E&E on F-16's (just starting) and used to work on C-130's.

[inpresser]

Im a crew chief where are you at ??
E&E is a good job got alo of friends in that career field .?

[savagepicco26]

headed to Shaw AFB this week.

[inpresser]

oh boy Good ole Shaw have fun hehe

[Max Payne]

I was having a lot of trouble with my 2.5R dieing on me untill I richened my LSN up about a half turn from stock settings. Runs great right there.