Hi guys, so lately I've been doing some brief reading on tuning and remapping, and have a few questions. Excuse my lack of knowledge , still learning here for some future projects. I know tunning and remapping are essential if you change to a full exhuast system, to ensure the ECU is working appropriately from the huge air intake (from the exhaust system). In turn it adds some HP and prevents engine damage (though I've read you can tune based on what you want? E.g. fuel economy, more HP, etc...). Here are some of my questions.

1) How does tunning/remapping work? Like does it recode the codes of the bike's ECU from the factory? Won't the engine parts be a limitation no matter how much the ECU is being recoded to balance the fuel and air intake? Do they like add in additional structural parts to the bike's engine? By doing either, will it be detrimental towards the bike engine since the makers have made the bike specifically to perform optimally?

2) What are the steps in remapping a bike following a complate full system exhaust change?

3) I've heard that to tune a bike , there are different types of auto tuners? And each are coded differently?

4) also read that if the tuner (the person who's tuning your bike) isn't knowledgeable, he could possible ruin the bike ? If so, what are the basic parameters one needs to know when tuning?

5) what are the best recommended auto tuners specifically for the Yamaha r25 (yes, not a worthy bike for tuning, but hey why not lol) ? Or are all auto tuners universal?

6) any recommendations for a reputable shop who knows how to tune properly? Preferably for Yamaha r25. What about these - tuneboss and motodynamics ?

7) Thank you for reading these long thread. I hope to learn from the sifus here.

What for ?

actually all the answers u can find online..

just need to do a lil more work.

if u go ask pomen, most wont tell you the truth.. some might even 'bull xxx' you.


so u need to get infos from reliable sources,

any keen scholar will definitely turn to books. ..

for eg like this.. will answer all your Qs..

https://www.amazon.com/Motorcycle-Managemen...gine+management


if one came from car tuning, i think bike is like piece of cake. ???

those car efi tuning like the b series stuffs are all over the internet.. tested n proven for many years..

I see , interesting. Haha, my background knowledge for automotive vehicles is zero. I've googled and many websites cover them superficially, they only mention recode ecu > boom > better fuel intake to compensate for the huge air intake > performance > engine won't die.

Would love to equip myself with some basic knowledge about tuning so if ever in the future, hopefully, I won't get conned lol. Thanks by the way ! You've been very helpful and guided me with all my threads that I've opened haha.

EDIT: I find this website to have covered way more detailed explanation . It's all making sense now haha https://www.motorcyclistonline.com/all-abou...-mc-garage-tech

This post has been edited by kshen: Dec 15 2018, 11:59 PM

Planning to tune my r25 in the long future meanwhile doing some research beforehand so I know what I'm suppose to look out for, though not worth it for a quarter litre bike (yes I know), just solely for my engine to support a full exhaust system - slip ons doesn't give that nice "bassy" sound on the r25.

Are you sure slip ons can't give the sound you want? I've seen multiple types of slip ons used on R25s, and some do sound nice and not annoying. It's usually the one bigger slip ons, not the super short super small acah GP bike one.

Well, I wouldn't say it's a full frontal "experience" but rather based on hours of intense youtubing haha. In person, I've heard the pro liners before, they give off a bit more "louder" than the stock. Currently looking for something more "Bassy". Do you have any recommendations ?

To add, I've already read that slip-ons, if not made specificially for that bike's model you'll need to tune it regardless (some added that knockoffs from original brands may cause this problem). But to my knowledge, Akra and SC does make R25 slip ons, might consider those but the price is a killer. Their sound samples on their website seems pretty good, but with all the knockoffs in the market, I'm a little skeptical to get them owing to that I have no knowledge in telling the difference between ori and fake.

This post has been edited by kshen: Dec 16 2018, 05:16 PM

so .. you considering spending .. 3k++ for full system and ECU just for 5hp gain (if can) and awesome loud noises presence on the road?

and those money you will spend all on a R25?

you got the wrong bike buddy...

1/ how it works, yes basically changes the codes already pre-set in the factory... what it does it tells when and how much to pump fuel... and when to ignite it... a retune, adjusts these maps to acoomodate the changes in ur engine setup.. retune/remap is basically limited by ur hardware. so yes, engine is a limitation... but thats the thing... u are tuning ur map to suit ur engine.... not build ur engine to suit ur tuning. doesnt work that way. when it comes to car/bike builds, u always do hardware first, then fine tune the software to suit ur hardware. a good tune may actually help ur bike to perform better than factory setting. coz factory basically uses 1 tune for ALL scenarios (weather, climate, elevation etc). so a custom tune will suit YOUR bike, with YOUR hardware, with YOUR choice of fuel, with YOUR climate etc etc etc

2/ assuming uve done ur research on available tune options as well as its costs and tuners, choose ur tuner...bring bike to shop (preferably on a hot day) and get it tuned... thats it

3/ i've never heard of a single person in malaysia running auto tuners. id say forget it... go back to point 2.

4/ correct, tuning isnt just about software, it is also a skill needed by the tuner to fully understand what he/she is seeing on the screen and graphs so they can make informed decisions on what to change. hence a good tuner is also important. back to point 2. do ur research... r25 is a super common bike.. so many tuners out there for this bike. as for what are the basic parameters.. no idea.. basics of tuning isnt so basic..diff softwares has diff way of displaying data. do take note though, that no matter how good a tuner is... the risk is always there when u climb on the dyno. and if anything happens, tuners are not liable.

5/ back to point 3.

6/ besides the 2 u mentioned (which ive never researched), theres also dr dyno in puchong and also adam performance in sek 7 shah alam. bike concept in kota damansara. all have different tuning options with different prices. so yeah... do ur research on what they offer, feedback on the tuner etc etc.

with all that said... for ur r25.....seriously, just get a slip on and get on with ur life since all u want is the sound. spend just a few hundred and ull be happy. can be fakies, can be ori.... no need to worry about "specifically made for ur bike" thing. this rule doesnt apply to mufflers imho as mufflers are usually universal... only issue may be fitment but even then, with the correct link pipe, all is fine.

plus with a full system, u can expect quite alot of popping from exhaust even after a good tune... slip on wont really have that.

Clearly you didn't read through my explanations above, buddy. I'm well aware of how stupid it is to do the above mentioned , and I agree , but hey if you have extra money to burn why not . If I wanted awesome loud noises and HP , I'd have went for a Ducati panigale V4s lol. The whole point of this thread is mostly understand how remapping works for future projects, the subsequent questions were solely out of curiosity. Thanks anyways for your helpful input.

This post has been edited by kshen: Dec 17 2018, 01:31 PM

Thank you for your helpful input. Found it very helpful. I've heard many slip ons , sadly none of the sound emitted isn't to my liking which unfortunately I think it's just the sheer nature of how a two cylinder bike sounds like haha. However, do you have any recommendations on some that's pleasantly decent?

u heard via youtube? doesnt sound the same if thats the case. join TTs ull get to hear them all first hand.

n yes parallel twins typically sounds like shit..... and most mufflers will sound the same on these engines... just a matter of volume... i used to own a z250 with a slip on... and i barely heard any difference with other 250cc parallel twins besides volume.

as for wat sounds nice... up to u man...i personally like loud and rough sounding exhausts... so i tend to gravitate towards the SC Project CRT or M4 mufflers although i didnt use these... mine was one of those big carbon fiber cans which came with the bike when i bought it.

Maybe yes I am too lazy to read string of text, apologize for that.

Come join us for TT and ride LYN group.. if you keen PM me your contact..

Yeah, I think that's my mistake right there - trusting YouTube sounds over a tablet haha. I'll check them out , apparently I'm looking for more "bassier" sounds but I guess it's pretty difficult for a parallel twin mesin jahit haha. What's your input on Arrow and akras ?

No need to apologize bro, I too would've done the same haha. You're helping in a constructive way and I , as a virgin to bikes, appreciate your input regardless. You guys don't mind newbies right ? Haha.

as a brand in general... both are good brands with quality stuff.

as for sound.. depends on model... but no diff in my opinion.

a fellow forumer has a ninja 250 SE which comes with original arrow slip on...sounds the same as my chapalang akra.

a neighbor also had a ninja 250r with original yoshimura slip on... sounds the same as mine... but mine is louder.

I also a noob... only mod I did with my bike was adding handlebar riser and a top box...

Youtube doesn't do the sound justice, you need to hear them in real life. And since parallel twin engines sound about the same anyway, you can hear not just the R25 but the Ninja 250 and Z250 as well.
As for slip on recommendations, I would advise to get the Arrow slip on that came with the Ninja 250 SE. These are pretty cheap secondhand and are made of good materials [since they are original Arrow not a knock off].

Thanks bro. I will look into Arrow. If only I can request for a "try on" for the slip on before installing them haha

Lol. Will PM you my ddetails ! Thanks for the offer .

Do you reckon the arrow would have similar effects on a R25 compared to the Ninja?

If you make the exhaust freer flowing, the ignition map needs to be adjusted accordingly.

The built-in stock ECU may compensate to some degree, but it may not be enough. So depending on what you changed your bike might run leaner as a result or you get backfires.

Stuff like Powercommanders & Bazzaz come in at this point. They piggyback on the stock ecu to allow the ignition signals to be manually adjusted even further. So the bike goes on a dyno, and the tuner will finetune or reprogram the ignition map to suit the freer flowing exhaust to eliminate flat spots in the horsepower & torque curves or even to add a few more.

But all this ain't cheap.

The question to ask is... is it worth the cost considering what u use the bike for?

wanna join sir..
which area anyway?